angular dependence of analyzing power in np elastic scattering between 0.312 and 1.10 gev

Nuclear Physics A559 (19931489-510 North-Holland

NUCLEAR PHYSICS A

Angular dependence of analyzing power in np elastic scattering between 0.312 and 1.10 GeV

J. Ball, Ph. Chesny, M. Combet, J.M. Fontaine, CD. Lac I, J.L. Sans

Laboratoire N~t~~~al SAlWWE, C~R~-~~2P~ and CEA /LX%, CE Saclay, 91191 Gif sur Yvette Cedex, France

J. Bystricky, F. Lehar, A. de Lesquen, M_ de Mali, F. Perrot-Kunne, L. van Rossum

DAPNIA, CE Saclay, 91191 Gif stir Yvette Cedex> France

A. Ahmidouch, P. Bach ‘, Ph. Demierre, G. Gaillard 3, R. Hess, R. Kunne 4, D. Rapin, Ph. Sormani 5

L?PiVC, Universes of Geneva, 24 quai Ernest-An~ermet, 1209 Geneva 4, Switzerland

J.P. Goudour

C. E. NJ., ~~rnajne du Haut- Wgneau, 33170 Grad~gnan, France

R. Binz, A. Kiett, E. Rijssie, H. Schmitt

Faculty of Physics, Freiburg University, 7800 Freiburg im Breijgau, Germany

D. Lopiano, H. Spinka

ANL-~~~, 9700 South Cuss Avenue, Argonne, IL 60439, USA

Received 23 November 1992

Abstract We present a total of 427 np analyzing power data points in a large angular interval at 12

energies between 0.312 and 1.10 GeV. The SATURNE II polarized beam of free monochromatic neutrons was scattered either on the Saclay frozen-spin polarized proton target or on CN, and C targets. Present results are compared with existing elastic and quasieleastic data.

Correspondence to: Dr. F. Lehar, ~APNIA/SP~N, CE Saclay, 911911 Gif sur Yvette Cedex, France. Present addresses: ’ Institut National des Telecommunications, 9 rue Charles Fourier, 91011 Evry, France. ’ College Rousseau, 16A avenue du Bouchet, 1209 Geneva, Switzerland. ’ Schlumberger Ind., 87 Route de Crigny, 91130 Ris Orangis, France. 4 Present address: LNS, CE Saclay, 91191 Gif sur Yvette, Cedex, France. ’ Brainsoft Consulting S.A., Cusinand 46, 1285 Athenaz, Switzerland.

03759474/93/$06.00 Q 1993 - Elsevier Science Publishers B.V. All rights reserved

490 J. Ball et al. / Angular dependence (II)

Key words: NUCLEAR REACTIONS ‘H (polarized n,n), E = 0.8-1.1 GeV; measured spin correlation parameter. Polarized frozen-spin target.

1. Introduction

We report results of the np elastic-scattering analyzing power at 0.312, 0.363, 0.800, 0.840, 0.860, 0.877, 0.880, 0.910, 0.940, 1.00, 1.08 and 1.10 GeV. These results are a part of a systematic study of the nucleon-nucleon system in the energy range of SATURNE II. For the present data we assume isospin invariance implying the equality of the beam analyzing power A,,,, and the target analyzing

power A OOOn for np elastic scattering. Part of the data at 0.477, 0.88, 0.91 and 0.94 GeV, where A,,, and A,_,, were determined separately, was already treated in ref. [l]. All measurements were performed at SATURNE II with a polarized beam of free quasi-monochromatic neutrons scattered either on the Saclay frozen-spin proton target (PPT) or on a CH, target. The beam and target polarizations were oriented vertically. In the same experiment the spin correlation parameter A.,,,,“, the depolarization D,,,, and the polarization transfer K,,,, were measured also. These data will be reported in a forthcoming paper. Most of the data were taken simultaneously with transmission measurement of the total cross-section difference Aa, (ref. [2]). The present results are compared with other np elastic-scattering data [3-71, and with pn or np quasielastic data [8-121. Our results at 0.88, 0.91 and 0.94 GeV are in excellent agreement with previous A..“. and A.,,,,” data at the same energies [l], but the large amount of measured data points does not allow one to show all data points in the same figures.

Throughout this paper we use the nucleon-nucleon formalism and the four-spin notation developed in ref. [131.

2. Polarized beam and target

Polarized neutrons are produced by break-up of vector-polarized deuterons on a Be target. This production target was 10 cm thick at 0.312 and 0.363 GeV and 20 cm thick at the other energies. The break-up protons are swept into a beam dump. The vertically polarized neutron beam is defined by a total of 8 meters of collimators inserted in the 17.5 m long neutron beam line. At the polarized target the beam spot was either 20 mm or 30 mm in diameter. The neutron beam has a momentum spread due to deuteron absorption in the production target and to the Fermi motion of neutrons in deuterons. The momentum spread is of the order of f20 MeV. The polarized deuteron beam with (2-3) x 10” deuterons/spill pro- duces - (6-8) x 10’ neutrons/spill at the PPT. The neutron beam intensity was monitored by a scintillation counter array inserted in the beam in front of the polarized target [21.

J. Ball et al. / Angular dependence (II) 491

The deuteron beam polarization was flipped every burst of the accelerator by a change of the RF transitions in the ion source. The polarization of break-up neutrons was determined by a measurement of the np elastic-scattering asyrnme- tries &n = PBAoono and &n = PTA,,_ (ref. [l]). Using the known target polariza-

tion P, and assuming Aoono = A,,, we obtain P, = 0.59, independent of the neutron beam energy [1,14]. At each energy the polarization of the protons in the accelerated deuterons was also checked by the beam polarimeter [13].

The PPT was 35 mm thick, 40 mm wide and 49 mm high [16]. The target material was pentanol, with a typical proton polarization of 85%. The target polarization is held in a vertical magnetic field of - 0.33 T produced by a vertical super-conducting holding coil. The target polarization was inverted every few hours.

3. Experimental set-up and data analysis

The apparatus is designed for pp, np and pn elastic-scattering experiments in a large angular domain. It allows one to measure the angular dependence of several spin observables simultaneously. The experimental set-up is described in ref. [14]. Outgoing particles are detected by a two-arm spectrometer which contains single scintillation counters, counter hodoscopes, the neutron counter (NC) hodoscope with its VETO, analyzing magnet and eight multiwire proportional chambers, each having three wire planes.

The NC hodoscope [14,17] consists of 15 scintillating bars and measures a particle position from the time difference between signals from the two PM’s on either side of a bar, with a precision of 525 mm. Veto counters in front of the neutron counter hodoscope distinguish between neutral and charged particles.

The neutrons scattered at backward c.m. angles may be converted into charged particles in a carbon plate. These particles are subsequently detected in scintillation counters and their coordinates are determined by hits in two MWPC’s that follow the carbon plate.

The NC hodoscope efficiency is N 15-20% whereas the efficiency for detecting np elastic scattering in the backward hemisphere by charge-exchange reactions on carbon is about 1.5%. For this reason the backward-scattering data have considerably larger errors.

In order to monitor correctly measurements with two opposite target polarization directions, a polyethylene “CH*” target 3 to 10 nm thick was positioned downstream from the PPT and viewed by a dedicated scintillation counter. Particles scattered either on the PPT or on the CH, target produce independent triggers, but their tracks are detected in the same MWPC’s. The number of these events is independent of the target polarization and is used as a normalization of data with opposite target polarization.


The triggers and fast electronics are described in ref. [141. Candidates for np elastic-scattering events are determined and recognized by three different pretriggers. Any pretrigger has to be validated by the NC and its VETO logic. The following pretriggers are used:

(1) Forward neutron, backward proton, np scattering in the PPT: pretrigger TND.

(2) Forward neutron, backward proton, np scattering in the CH, target: pretrigger MND.

(3) Forward proton, backward neutron from both targets - pretrigger TNG (which of the target is hit is distinguished in the OFF-LINE analysis).

The sum of pretriggers enter in the NC logic, which determine charged or neutral NC events, and give the master trigger. This trigger gives an event interrupt NIM signal to the CAC module (based on the Motorola 68000 micropro- cessor) and to the on-line computer. The CAC module starts the acquisition procedure of MWPC’c and TDC’s and the information from different memory units. Coincidences between the accepted master-trigger signals and delayed pretriggers determine the final kind of triggers.

The data analysis is described in detail in ref. [141. For all types of events the proton track was reconstructed from the hits in the MWPC’s. For the reconstruction of the neutron trajectory, the interaction vertex in the target is assumed to be the intercept of the track of the proton, measured in the conjugate arm, with the vertical plane containing the beam axis. The second point of the forward neutron trajectory is given by the neutron position in the NC hodoscope. For the backward neutron it is determined by the intersection of the charged particle track from the neutron charge exchange in carbon with the medium plane of the carbon con- verter.

The forward particle momentum is determined by neutron or proton time-of- flight between the PPT and the NC hodoscope (all events) and from the curvature of charged particles in the spectrometer magnet (TNG events only).

The wings in the coplanarity and conjugate particle distributions were used to subtract the carbon and inelastic background in our measurements. This method could not be applied for two lowest energies at backward neutron angles (TNG events). Protons from the neutron charge-exchange reactions have small energy and their energy loss in the carbon plate and in the scintillators is too large. Consequently their tracks can be hardly detected in MWPC’s following the carbon plate. At 0.363 GeV the A..,,. analyzing power at large angles was measured for CH, and carbon targets and the normalized numbers of counts were subtracted in order to obtain the hydrogen effect. The difference of A.,,,,. for these targets is small. At 0.312 GeV the measurement was done with CH, target only. We considered that the ratio of A,,... values, measured at 0.363 GeV, is the same as for 0.312 GeV and can be used for a small correction of the analyzing power at this energy.


4. Results and discussion

The general expression for the differential cross section of elastic scattering with polarized beam and polarized target is given in ref. [13]. For measurements with beam and target polarizations (Pn and P,, respectively) oriented vertically,

the general formula in ref. [131 reduces to

where (+ = (da/do) is the differential cross section, cp is the angle between the reaction plane and the laboratory horizontal plane, A.,,,, A,,, and A.... are measured observables. The beam polarization value I P, I is practically independent of its direction whereas the absolute values of the target polarizations differ. The four different combinations of the beam and target polarizations allow the determination of the two analyzing powers and the spin correlation parameter A oonn. Angular dependences of the beam and target analyzing powers, determined separately in ref. [l], show that A.,,.. and Aooon coincide within experimental

errors. This is in agreement with isospin invariance conservation for np scattering which implies Aoono = A.,,,,,,. This equality was imposed on the present results.

The polarized neutron beam was used for all measurements. Using the CH, target, the terms containing P, in eq. (1) drop out and only A,,..,, may be measured.

The data at 12 energies are listed in tables 1-16. In tables 1-12 are listed the results obtained with the main target, polarized or unpolarized. Tables 13-16 contain the A,,,, results at 0.84, 0.86, 1.00 and 1.10 GeV, obtained with the

Table 1 Results of the analyzing power A,,,, for np elastic scattering at 0.312 GeV. The CH, target was used a

e c.m

(deg.)

50.2 0.105

Exp. value

0.361 f 0.042

e c.m. (deg.)

89.7 0.292

Exp. value

- 0.205 + 0.031 53.0 0.117 0.315 * 0.050 55.0 0.125 0.248 f 0.047 57.0 0.133 0.247 f 0.044 60.0 0.147 0.230 f 0.028 64.0 0.165 0.197 f 0.027 68.0 0.184 0.113 f 0.030 71.0 0.198 0.081 + 0.042 73.0 0.207 0.007 * 0.040 75.0 0.217 - 0.003 f 0.037 78.0 0.232 - 0.062 f 0.026 82.0 0.252 -0.114 f 0.024 85.9 0.272 - 0.145 i 0.026

95.6 0.322 - 0.259 + 0.086 98.5 0.336 - 0.279 f 0.019

102.2 0.355 -0.271 _+ 0.014 106.1 0.374 - 0.228 f 0.011 110.0 0.393 - 0.219 k 0.012 113.8 0.411 - 0.220 + 0.012 118.1 0.431 - 0.203 f 0.013 122.0 0.448 -0.191 + 0.012 126.0 0.465 -0.190 + 0.012 129.4 0.479 -0.164 f 0.013

a Tki, = 0.312 GeV, P,,, = 0.827 GeV/c, total 24 points.

494 .I. Bail et at. / Angular de~e~d~n~e @I)

Table 2 Results of the analyzing power A,,,, for np elastic scattering at 0.363 GeV. The CH, target was used a

e Em3 Exp. value e e.m Exp. value (deg.) (deg.1

49.1 0.11% 0.349 f 0.071 52.1 0.132 0.299 + 0.035 54.2 0.141 0.282 f 0.030 58.1 0.160 0.176 f 0.024 62.0 0.181 0.200 &- 0.022 65.8 0.201 0.111 + 0.024 70.1 0.225 0.007 It 0.026 74.0 0.241 - 0.026 _+ 0.023 78.1 0.270 - 0.073 + 0.022 82.0 0.293 - 0.132 rfr 0.021 85.0 0.311 - 0.209 + 0.031 87.0 0.323 -0.195 It. 0.034

89.0 90.7

98.0 0.389 - 0.300 + 0.036 102.2 0.413 - 0.221 + 0.030 106.0 0.435 - 0.237 + 0.02% 110.0 0.458 - 0.265 + 0.02% 113.9 0.479 - 0.282 I 0.032 118.1 0.502 -0.181 + 0.031 122.0 0.522 - 0.210 + 0.029 127.0 0.546 - 0.178 + 0.024

0.334 0.344

- 0.252 + 0.035 - 0.159 + 0.05%

a Tkin = 0.363 GeV, PIat, = 0.902 GeV/c, total 22 points

additional CH, target. These results at 0.88, 0.91 and 0.94 GeV are reported in ref. [l]. Table 17 shows A..,, angular dependence for the elastic and quasielastic scattering at the CH, and C targets at 0.363 GeV. The ratio AO,,,(CH,-

28.8 32.3 36.0 39.8 43.6 47.2 51.2 55.2 59.2 61.9

Table 3 Results of the analyzing power A,,,, = A,,, for np elastic scattering at 0.80 GeV a

Exp. value IFfeV,c)2 A.,,.. = A,,,,

e “m’

Exp. value (deg.) &V,C)~ A ,,OnO = A....

0.093 0.357 f 0.039 66.9 0.457 0.122 f 0.039 0.116 0.34% + 0.016 68.9 0.480 0.068 + 0.054

0.143 0.343 + 0.015 71.0 0.506 0.132 10.06% 0.174 0.345 f 0.011 73.0 0.531 0.015 i 0.060 0.207 0.325 + 0.011 75.0 0.557 - 0.043 It 0.059 0.241 0.312 + 0.012 77.0 0.582 - 0.053 * 0.050

0.280 0.280 f 0.01% 79.0 0.607 -0.173 + 0.061

0.322 0.276 & 0.027 81.0 0.634 - 0.154 & 0.056

0.366 0.203 f 0.03% 83.0 0.659 -0.13% + 0.05%

0.39% 0.236 f 0.103 85.0 0.685 -0.111 kO.057 87.0 0.711 - 0.153 + 0.058 89.0 0.737 - 0.144 f 0.064 91 .o 0.763 - 0.230 + 0.063 93.8 0.801 -0.187 + 0.050

47.5 49.1 51.0 53.0 55.0 57.0 59.0 61.0 63.0 65.0

0.244 0.259 0.278 0.299 0.320 0.342 0.364 0.387 0.410 0.433

0.322 + 0.06% 0.320 rt 0.029 0.260 + 0.025 0.243 &- 0.025 0.243 i: 0.02% 0.235 f 0.030 0.227 i 0.027 0.135 + 0.028 0.163 f 0.031 0.178 + 0.033

98.3 0.859 - 0.267 _t 0.20%

102.3 0.910 - 0.295 + 0.132 105.8 0.955 - 0.341 F 0.138 112.9 1.043 -0.384 + 0.117

122.0 1.149 - 0.327 + 0.188

a Tki, = 0.800 GeV, Plah = 1.464 GeV/c, total 39 points.


Table 4 Results of the analyzing power A,,, = A,,, for np elastic scattering at 0.84 GeV a

e c.m. Exp. value Exp. value

(deg.) &V,C)~ A DDnO = A,,,, &c)’ A OonO = A,,,

48.1 0.261 0.261 k 0.010 50.0 0.282 0.273 rt 0.008 52.0 0.303 0.275 rf- 0.008 54.0 0.324 0.243 f 0.008

56.0 0.347 0.212 f 0.009

58.0 0.370 0.192 + 0.009 60.0 0.394 0.182 f 0.009 62.0 0.418 0.158 ?c 0.010 64.0 0.442 0.141 f 0.010 66.0 0.467 0.117 + 0.011 68.0 0.492 0.092 f 0.011

69.9 0.518 0.076 f 0.013 72.0 0.544 0.042 + 0.013 74.0 0.571 - 0.012 $- 0.013 76.0 0.597 - 0.012 f 0.013 77.9 0.624 - 0.075 * 0.014 79.9 0.651 - 0.096 + 0.015

82.0 0.678 -0.120 f 0.016 83.9 0.705 - 0.173 + 0.019 86.0 0.732 - 0.168 f 0.022 87.9 0.760 - 0.236 + 0.026 89.9 0.787 - 0.254 + 0.034 91.9 0.815 - 0.221 i 0.044 93.8 0.840 - 0.244 f 0.079

85.5 0.884 - 0.269 + 0.063 98.9 0.911 - 0.206 f 0.048

103.1 0.966 - 0.296 f 0.048 107.0 1.019 -0.216 k 0.041 111.0 1.070 - 0.249 f 0.047 115.0 1.122 - 0.162 k 0.043 118.9 1.169 - 0.216 ?c 0.046 122.9 1.216 - 0.228 + 0.052 126.0 1.251 -0.157 f 0.109

a Tkin = 0.840 GeV, P,,, = 1.511 GeV/c, total 33 points.

C)/&_,,(CH,) is 1.046. It was applied to the AO,,, results measured at 0,312 GeV using the CH, target only. The corrected AO,,,(CH,) results at this energy are listed in table 1.

Table 5 Results of the analyzing power A,,, = A,,,, for np elastic scattering at 0.86 GeV a

e c.m.

(deg.)

48.0

&,c)2

0.267

Exp. value A OOnO = A,,,,

0.297 + 0.015

&,c)~

0.694

Exp. value A O,,n,, = A,,,

-0.139 f 0.021

50.0 0.288 0.270 _+ 0.012 84.0 52.0 0.310 0.255 + 0.012 86.0 54.0 0.332 0.220 f 0.012 88.0 56.0 0.356 0.184 f 0.013 90.0 58.0 0.380 0.175 f 0.013 92.0

60.0 0.404 0.196 f 0.014 93.9 63.0 0.441 0.163 f 0.010 66.0 0.478 0.125 + 0.016 95.4 68.0 0.504 0.077 f 0.016 101.0 71.0 0.545 0.029 _+ 0.012 107.1 74.0 0.584 0.004 f 0.018 113.0 76.0 0.611 - 0.052 f 0.019 118.9 78.0 0.639 - 0.066 f 0.019 123.0 80.0 0.666 - 0.095 f 0.019

a T,,, = 0.860 GeV, P,,, = 1.535 GeV/c, total 28 points.

0.722 - 0.140 + 0.020 0.750 - 0.187 f 0.022 0.778 - 0.210 f 0.022 0.806 - 0.200 + 0.022 0.834 - 0.266 k 0.024 0.861 - 0.258 rt 0.029

0.883 - 0.295 f 0.076 0.962 - 0.254 f 0.048 1.044 - 0.283 f 0.058 1.096 - 0.251 f 0.043 1.197 - 0.263 f 0.065 1.246 - 0.207 i 0.072

496 J: Ball et at. / Angular dependence (rr)

Table 6 Results of the analyzing power A,,, for np elastic scattering at 0.877 GeV. Data taken with the CH, target a

i3 c.m. (deg.)

Exp. value Exp. value

47.7 0.269 0.341 * 0.086 49.3 0.286 0.287 + 0.017 51.1 0.306 0.273 f 0.009 53.0 0.328 0.264 f 0.008 55.0 0.351 0.246 f 0.008 57.0 0.374 0.243 f 0.008 59.0 0.399 0.211 + 0.008 61.0 0.424 0.209 -or. 0.008 63.0 0.449 0.150 + 0.008 65.0 0.475 0.128 k 0.008 67.0 0.501 0.112 + 0.009 69.0 0.527 0.083 rt 0.009 71.0 0.554 0.040 * 0.010 73.0 0.582 - 0.001 If: 0.010 75.0 0.610 -0.017 * 0.010 77.0 0.638 - 0.064 f 0.011 79.0 0.666 - 0.099 * 0.011

81.0 0.694 - 0.140 * 0.011 83.0 0.722 - 0.170 f 0.011 85.0 0.751 - 0.173 t 0.011 87.0 0.780 - 0.216 * 0.011 89.0 0.808 - 0.233 f 0.012 91.0 0.837 - 0.239 + 0.013 94.6 0.889 - 0.240 + 0.008

90.2 0.826 - 0.233 + 0.075 94.1 0.882 - 0.227 + 0.056 98.1 0.939 - 0.334 f 0.044

102.0 0.994 - 0.284 4 0.042 105.9 1.049 - 0.257 & 0.039 110.0 1.104 - 0.243 f 0.044 114.0 1.157 - 0.257 i 0.043 118.0 1.209 -0.173 f 0.046 121.9 1.258 - 0.157 f 0.050

a Tkin = 0.877 GeV, P,,, = I.555 GeV/c, total 32 points.

The errors in the tables are statistical only. We estimate that an additional error due to uncontrolled instrumental effects is negligible for the present experiment. The uncertainties in the target polarization measurements are +3%. Another systematic error is due to the normalization of events with different signs of beam and target polarizations to the same integrated beam intensi~. Using the additional CH, target this error was considerably reduced. Measurements at the same angle and energy were summed and the final results are listed here. From ref. 1181, where some partial results are given, it follows that data from different runs agree.

The np elastic-scattering results are shown in figs. 1-12 and compared with other existing data. OUr data measured with the main target are plotted as black dots. An unpolarized CH, main target, providing A,,,, was used at 0.312, 0.363 and 0.877 GeV (figs. 1, 2 and 6, respectiveiy). At the remaining energies (figs, 3-12) the main target was the PPT where A,,,, =Aooon was implied. Data taken with the additional CH, target and listed in tables 13-16 are shown in figs. 4, 5, 10 and 12 by open circles. The shape of the angular distribution is very similar at all energies. The slope at the zero crossing point increases with increasing energy. The data measured in different angular intervals smoothly connect in overfapping regions. Fig. 13 compares A,,, angular dependence measured with the CH, and C targets at 0.363 GeV, listed in table 17.

Fig. 1 shows the excellent agreement of our A,,, data at 0.312 GeV with the recent TRIUMF measurement [3] at 0.325 GeV. Weighted average values of the

.I. Ball et al. / Angular dependence (If) 497

Table 7 Results of the analyzing power A,,,, = A,, for np elastic scattering at 0.880 GeV a

28.9 31.1 33.1 35.0 37.0 39.0 41.0 43.0 45.0 47.0 49.0

50.9 52.9 55.4

47.5 0.268 0.283 + 0.029 49.1 0.285 0.284 k 0.022

50.1 0.296 0.280 + 0.014

51.0 0.306 0.289 t: 0.021 52.9 0.328 0.295 rt 0.018 53.9 0.339 0.249 f 0.015 54.8 0.351 0.252 i 0.018 56.1 0.365 0.239 f 0.014 56.9 0.375 0.226 & 0.025 58.0 0.388 0.228 rt 0.011 59.0 0.401 0.200 rt 0.026

t&/d2 0.103 0.119 0.134 0.149 0.166 0.184 0.202 0.221 0.242 0.262 0.284 0.305 0.328 0.357

Exp. value A *on0 =A,,,

0.297 $: 0.020 0.286 + 0.013 0.294 +- 0.010 0.318 f 0.008 0.295 f 0.007 0.304 + 0.007 0.276 f 0.008 0.304 $: 0.008 0.322 + 0.009 0.280 + 0.009 0.245 * 0.009 0.268 i 0.011 0.211 F 0.013 0.167 riz 0.014

B c.m.

(deg.)

60.0 61.8

63.0 64.0 65.0 66.0 68.0 70.0

72.0 73.1 74.1 76.0 78.0 80.4 82.2 84.1 86.1 88.8 89.8 92.7 93.6

100.4 0.976 - 0.279 i 0.099 106.9 1.067 - 0.326 + 0.068 115.6 1.184 -0.219 + 0.081

0.412 0.436 0.451 0.463 0.477 0.491 0.516 0.544 0.570 0.585 0.600 0.627 0.655 0.689 0.714 0.741 0.771 0.809 0.823 0.865 0.878

Exp. value A *on* ==&XXl 0.217 & 0.014 0.202 4 0.022 0.182 + 0.035 0.166 + 0.015 0.104 * 0.036 0.102 f 0.013 0.084 2 0.016 0.095 & 0.015 0.054 + 0.018 0.037 + 0.045

- 0.010 t 0.016 - 0.035 f 0.018 - 0.076 + 0.019 - 0.087 + 0.019 -0.151 + 0.020 -0.161 _s 0.022 -0.189 f 0.023 - 0.251 * 0.022 - 0.204 + 0.045 - 0.290 4 0.037 - 0.275 i 0.068

a T,,,!, = 0.880 GeV, P,,, = 1.558 GeV/c, total 49 points.

TRIUMF A..., and A,, results are plotted as open circles. Results of the TRIUMF BASQUE group [4], aiso measured at 0.325 GeV and denoted by crosses, show a different shape of the angular dependence. Their v&es disagree with the results from ref. [3] at several angIes and the zero crossing point is at sIightIy different angIe. Fig. 2 compares our A,,, results at 0.363 GeV with LAMPF A OOOn elastic-scattering data [7] at 0.375 GeV (open circles). The LAMPF experiment (done in 1980) uses an unpolarized neutron beam scattered on a PPT. The beam had a continuous energy spectrum which allowed simultaneous measurements at nine energies from 0.375 to 0.775 GeV.

In fig. 3 our A_, =A,,, results at 0.800 GeV (black dots) are also compared with the LAMPF data at 0.775 GeV (open circles) from ref. [71. The A,,,, LAMPF results from ref. @I, measured in pn quasielastic scattering of a polarized proton beam on a liquid-deuterium target, are shown in fig. 3 by piusses. In the same figure, denoted by triangles, are plotted np quasielastic A..,,. =A_,, data


Table 8 Results of the analyzing power A,,,, = A,,, for np elastic scattering at 0.91 GeV a

9 c.m.

(;:V,c)’ Exp. value @C.,.

(deg.1 A M)no = A_, (deg.1

48.0 0.283 0.270 + 0.022 80.8 50.0 0.305 0.255 IO.018 84.9

52.0 0.328 0.252 * 0.018 88.8 54.0 0.352 0.274 k 0.019 92.5 56.0 0.376 0.266 f 0.021

58.0 0.401 0.227 f 0.022 95.4

59.9 0.426 0.199 rt: 0.025 99.1

62.0 0.452 0.165 f 0.026 102.9 64.0 0.479 0.155 f 0.030 107.0

66.0 0.506 0.122 + 0.031 111.0 67.9 0.533 0.068 z): 0.034 115.0

70.0 0.563 0.028 f 0.039 118.8

73.0 0.604 - 0.027 + 0.031 123.5 76.8 0.660 - 0.012 + 0.036

a Tkin = 0.91 GeV, PIab = 1.593 GeV/c, totai 26 points.

<G&c)’

0.718 0.777

0.836 0.891

0.934 0.989 1.045 1.103 1.160 1.214 1.266 1.327

Exp. value A DDnu = A,,,

- 0.116 rt 0.038 - 0.174 & 0.046

- 0.228 + 0.061 - 0.322 f 0.091

- 0.323 + 0.057 - 0.335 + 0.056 - 0.295 + 0.052 - 0.293 rt 0.052 - 0.202 rt: 0.055 - 0.236 -+ 0.048 - 0.208 + 0.05 1 - 0.254 + 0.052

from ref. [12]. These data were taken at 0.794 GeV with the SATURNE II polarized deuteron beam considered as a beam of quasifree neutrons and protons. Deuterons were scattered on the Saclay polarized proton target. The same deuteron

Table 9 Results of the analyzing power A,,, = A,,, for np elastic scattering at 0.94 GeV a

;Zg., &V,C)~ Exp. value

2g.l i&c? Exp. value

A,,,, = A,, A OOnO = A,,,

29.2 0.112 0.314 * 0.022 66.0 0.523 0.106 k 0.028 33.2 0.144 0.336 & 0.014 68.0 0.551 0.069 rt 0.031 37.0 0.178 0.327 i 0.012 70.0 0.580 0.093 + 0.037 41.0 0.216 0.344 * 0.013 72.0 0.609 0.041 + 0.039 45.0 0.258 0.326 + WI13 74.0 0.638 - 0.071 f 0.037 48.8 0.301 0.292 _t 0.015 76.0 0.668 - 0.056 rt 0.041 52.8 0.348 0.287 * 0.022 78.0 0.698 -0.122 + 0.046 56.8 0.399 0.285 + 0,034 80.0 0.728 - 0.182 & 0.044 60.8 0.452 0.177 + 0.043 81.9 0.758 - 0.170 f 0.054

84.8 0.803 -0.253 +_ 0.042 48.0 0.292 0.258 i 0.020 88.8 0.863 -0.179 +- 0.067 50.0 0.315 0.261 i 0.018 92.4 0.919 - 0.204 rir 0.096

52.0 0.338 0.233 4 0.017 54.0 0.363 0.229 + 0.018 PP.0 1.020 - 0.310 i 0.093 56.0 0.388 0.226 k 0.020 105.0 1.112 - 0.253 + 0.065 58.0 0.414 0.222 * 0.021 11.1.1 1.199 - 0.303 $0.098 60.0 0.440 0.184 i 0.023 116.4 1.275 - 0.236 f 0.057 62.0 0.467 0.136 t 0.025 123.0 1.362 -0.290 t 0.121 64.0 0.495 0.126 rt 0.026

a Tkin = 0.940 GeV, Piah = 1.628 GeV/c, total 36 points.


Table 10 Results of the analyzing power A,,.,,. = A,,,, for np scattering at 1.00 GeV a

tI c.m. (deg.) &,c)’

Exp. value

A.,,, = A,,,, &,c,’ Exp. value A OOnO = A,,,,

20.7 0.060 0.250 rt 0.070 23.5 0.078 0.356 + 0.023 26.4 0.098 0.371 * 0.015

29.7 0.123 0.362 f 0.014 32.8 0.150 0.339 + 0.015

36.0 0.179 0.346 f 0.015

39.1 0.211 0.320 f 0.018 42.2 0.243 0.259 f 0.028

45.6 0.281 0.301 + 0.075

48.0 0.310 0.319 f 0.012

50.0 0.335 0.309 f 0.011 52.0 0.361 0.262 + 0.010

54.0 0.386 0.289 f 0.011 56.0 0.413 0.245 + 0.011 58.0 0.441 0.231 f 0.012 60.0 0.468 0.189 + 0.013 62.0 0.498 0.140 * 0.013 64.0 0.527 0.133 + 0.014 66.0 0.556 0.117 + 0.015

67.9 0.586 0.067 + 0.016 70.0 0.617 0.019 f 0.019

72.0 0.648 - 0.007 f 0.017 74.0 0.679 - 0.063 f 0.017 76.0 0.711 -0.104 f 0.018 78.0 0.743 -0.160 + 0.019 80.8 0.775 -0.199 k 0.018 82.0 0.807 - 0.195 f 0.021 84.0 0.840 - 0.264 f 0.022

86.0 0.872 - 0.315 + 0.023

88.0 0.903 - 0.290 f 0.026 89.9 0.937 - 0.330 f 0.029 91.9 0.969 - 0.304 + 0.037

93.6 0.997 - 0.314 * 0.075

93.8 1.000 - 0.333 i 0.068 98.2 1.072 - 0.397 f 0.068

103.7 1.160 -0.213 + 0.065 106.9 1.212 - 0.309 f 0.057 111.2 1.278 - 0.144 f 0.059 115.0 1.334 - 0.233 f 0.052 118.9 1.392 - 0.316 f 0.054 123.0 1.491 - 0.105 k 0.060 149.6 1.747 - 0.352 f 0.330

a Tkln = 1.00 GeV, P,,, = 1.697 GeV/c, total 42 points.

beam scattering on CH, or carbon targets of a beam polarimeter provided data for np quasielastic A OOnO observable at several energies (ref. [lo]). These data at 0.800, 0.850 and 1.00 GeV are plotted in figs. 3, 4 and 10, respectively, where they are denoted by crosses.

In fig. 4 are shown our A,,.“,, =A..,,” results from table 4 (closed circles) and A DOnO results from table 13 (open circles). Except for the beam polarimeter data

Table 11 Results of the analyzing power A_” = A,,, for np scattering at 1.08 GeV a

e c.m.

(deg.) Exp. value

f&,c)z Ao_ =A_” e

“m’ (deg.) Exp. value A OO”O = A ooon

50.1 0.363 0.323 + 0.033 69.9 53.9 0.416 0.278 f 0.030 74.0 58.0 0.477 0.249 + 0.035 77.8 61.8 0.535 0.162 f 0.044 82.1 66.1 0.604 0.126 f 0.061 85.9

a Tki, = 1.08 GeV, P lab = 1.788 GeV/c, total 10 points.

0.666 - 0.027 f 0.058 0.735 - 0.024 f 0.060 0.800 - 0.156 f 0.065 0.875 - 0.211 f 0.061 0.942 -0.318 k 0.067

500 J. Bali et al. / Angulur dependence (II)

Table 12 Results of the analyzing power A..,, = A,,.,,, for np scattering at 1.10 GeV. Data are listed as in table 9 a

Exp. value <GreV/cfZ A,,,, = A,,

8 c-m’ (deg.) &J,cf2

Exp. value A OOnO = A,,,

25.6 0.102 29.3 0.132 33.1 0.167 37.0 0.207 41.0 0.253 44.9 0.301 48.9 0.354 52.8 0.407 56.8 0.467 60.9 0.530

48.0 0.341 50.0 0.369 52.0 0.396 54.0 0.425 56.0 0.454 58.0 0.485 59.9 0.515 62.0 0.548 64.0 0.579

0.324 i: 0.045 0.314 + 0.018 0.342 rf 0.014 0.308 + 0.013 0.363 t 0.014 0.345 rt 0.016 0.301 + 0.018 0.289 a 0.026 0.254 It 0.040 0.193 * 0.053

0.315 + 0.013 0.307 * 0.012 0.306 + 0.012 0.295 i: 0.013 0.275 a 0.014 0.216 i: 0.015 0.200 $ 0.018 0.203 t 0.020 0.158 k 0.023

66.0 0.612 67.9 0.644 69.9 0.678 72.0 0.714 74.0 0.748 76.0 0.782 78.0 0.817 80.0 0.852 82.0 0.890 84.1 0.924

91.9 1.068 97.1 1.160

103.0 1.265 107.0 1.334 111.1 1.403 115.0 1.437 119.0 1.532 122.9 1.593 126.4 1.645

0.109 + 0.025 0.072 f 0.027 0.068 + 0.034

- 0.009 k 0.038 - 0.065 + 0.040

- 0.075 + 0.042 - 0.153 rt 0.047 - 0.209 * 0.054 - 0.284 f 0.066 - 0.087 f 0.065

- 0.300 f 0.066 -0.310 + 0.031 -0.313 f 0.040 - 0.250 & 0.045 -0.316 i 0.041 - 0.264 k 0.041 - 0.299 + 0.047 -0.190 + 0.049 -0.116 i 0.082

a Tkin = 1.10 GeV, P,ab = 1.810 GeV/c, total 38 points.

(crosses) this figure contains np elastic-scattering A,,, results at small angles, measured by the IKAR collaboration at SATURNE II (refs. [5,61). The IKAR experiment used a free-neutron polarized beam and a gaseous hydrogen target in

Table 13 Results of the analyzing power A,,, for np elastic scattering at 0.84 GeV measured with the additional CH, target a

48.8 0.269 53.0 0.314 57.0 0.358 60.9 0.405 65.0 0.455 69.0 0.506 72.9 0.557 76.9 0.609

Exp. value A “““0

0.303 + 0.019 0.242 f 0.015 0.215 + 0.017 0.208 + 0.018 0.116 k 0.020 0.112 If: 0.021 0.062 + 0.024

- 0.096 k 0.029

e c.ln.

(deg.) Exp. value

80.8 0.662 -0.098 + 0.036 84.8 0.717 - 0.101 + 0.052

97.0 0.885 - 0.306 2 0.090

102.0 0.964 - 0.123 k 0.122 107.0 1.019 -0.116 rt 0.128 111.0 1.071 -0.268 f 0.123 117.0 1.148 - 0.357 + 0.085

a Tkln = 0.84 GeV, P,, = 1.511 GeV/c, total 15 points.


Table 14

Results of the analyzing power Aoono for np elastic scattering at 0.86 GeV measured with the

additional CH, target a

8 c.m.

(deg.)

48.7

53.0

57.0

61.0

64.9

68.9

-t (GeV/c)’

0.275

0.322

0.367

0.415

0.465

0.517

Exp. value

A oono

0.264 f 0.030

0.252 + 0.025

0.227 f 0.026

0.181 f 0.027

0.175 f 0.030

0.058 f 0.033

e C.rn. (deg.)

72.9

77.0

80.9

84.9

88.6

Exp. value

&,cY wnO A

0.569 0.026 f 0.037

0.625 - 0.090 f 0.041

0.679 - 0.085 f 0.046

0.736 - 0.225 + 0.054

0.787 - 0.290 f 0.064

a Tki, = 0.86 GeV, P ,ab = 1.535 GeV/c, total 11 points.

Table 15

Results of the analyzing power A,,.“. for np elastic scattering at 1.00 GeV measured with the

additional CH, target a

8 C.rn.

(deg.)

49.1 53.0

56.9

60.9

65.0

68.9

72.9

76.9

80.9

&,d2 0.323

0.374

0.427

0.482

0.542

0.601

0.663

0.726

0.789

Exp. value

A clone

0.279 f 0.029

0.292 f 0.021

0.233 f 0.023

0.171 f 0.025

0.117 f 0.028

0.012 + 0.030

- 0.026 f 0.034

- 0.144 k 0.041

-0.163 f 0.051

2;., &,c)2 85.5 0.922

99.2 1.088 -0.284 f 0.185

103.2 1.152 -0.250 + 0.196

107.3 1.217 - 0.200 f 0.175

111.1 1.277 -0.178 f 0.149

114.9 1.333 - 0.307 + 0.151 118.8 1.391 - 0.089 f 0.158

Exp. value

A Dono

- 0.197 k 0.058

a T,,, = 1.00 GeV, P ,ab = 1.697 GeV/c, total 16 points.

Table 16

Results of the analyzing power A.,,, for np elastic scattering at 1.10 GeV measured with the additional CHz target a

kg.,

50.0

53.2 56.9

60.9

65.0 68.9

Exp. value

&,cP OOnO A

0.336 0.296 + 0.039

0.414 0.367 f 0.048 0.469 0.238 f 0.050

0.531 0.223 f 0.050

0.596 0.221 + 0.058 0.661 - 0.018 f 0.057

Pii;.,

72.9

76.9

103.4

115.4

Exp. value

&tev,cY OOnO A

0.729 0.084 + 0.063

0.799 - 0.139 f 0.071

1.273 - 0.327 f 0.163

1.477 -0.365 f 0.127

a Tkin = 1.10 GeV, Plab = 1.810 GeV/c, total 10 points.


Table 17

Analyzing power for np elastic and quasielastic scattering measured with the CH, and carbon targets at

0.363 GeV. Only recoil protons were detected a

CH, target C target

8 c.m.

(deg.)

95.4

98.4

102.2

106.0

110.0

113.9

118.1

122.0

126.1

129.0

&V/c)’ 0.373

0.390

0.413

0.435

0.458

0.479

0.502

0.522

0.542

0.556

Exp. value A OO”O

- 0.300 f 0.018

-0.244 k 0.012

-0.237 k 0.013

- 0.237 f 0.013

- 0.230 k 0.015

- 0.237 * 0.013

- 0.215 k 0.014

- 0.200 f 0.015

- 0.166 f 0.019

- 0.201 f 0.060

0 cm.

(deg.)

Exp. value

95.5 0.374 -0.167 f 0.142

98.4 0.390 - 0.162 f 0.039

102.1 0.412 - 0.263 f 0.030

106.0 0.435 - 0.238 + 0.027

110.0 0.458 -0.181 f 0.025

113.9 0.479 -0.117 f 0.028

118.1 0.502 - 0.256 f 0.024

122.0 0.522 - 0.187 k 0.023

126.1 0.542 -0.179 + 0.023

129.0 0.556 -0.168 f 0.032

a Tki, = 0.363 GeV, P,,, = 0.902 GeV/c.

conjunction with an original apparatus for slow recoil-proton detection. The IKAR data at 0.834, 0.934 and 0.985 GeV are shown in figs. 4, 9 and 10, where they are denoted by plusses.

In fig. 5 are plotted the results at 0.86 GeV, listed in tables 5 and 14. Fig. 6 shows the results at 0.877 GeV, obtained with the CH, main target and listed in table 6. These results accurately determine the A..“. angular dependence also at large angles.

Figs. 7, 8 and 9 show the A,,.,,. =A,,..” results at 0.88, 0.91 and 0.94 GeV, respectively, which complete our separate measurements of the A.,,, and A_,

0.3

- 0.2 0.320 &V

0.1

O_------------- -------------- -----_

- 0.1 -

-0.2-

-0.3 ’ ’ ’ ’ ’ ’ ’ ’ ’ I 1 I 1 I I I 0 30 60 90 120 150 180

8CM MegI

Fig. 1. Analyzing power for np elastic scattering around 0.32 GeV. Meaning of symbols: (closed circles)

A OOnO at 0.312 GeV measured with the CH, target; (open circles) averaged values of AoQno and A,,,, observables at 0.325 GeV measured at TRIUMF, ref. [3]; (plusses) A,,,, at 0.325 GeV measured at

TRIUMF by the BASQUE group, ref. [4].


0.2 -

0.1 -

a +

- 0.370 GeV _

Q

9 O_---__-------_-++----_---___-__-_______

4

-0.1 - d

-0.2- ‘aii f +&v4

-0.3 - yg _I I I I I I I I II I I I I I1 I I

0 30 60 90 120 150 180

BCM(deg)

Fig. 2. Analyzing power for np elastic scattering around 0.37 GeV. Meaning of symbols: (closed circles)

A ODnO at 0.363 GeV measured with the CH, target; (open circles) Aooon at 0.375 GeV measured at

LAMPF with an unpolarized neutron beam and the PPT, ref. [7].

observables, as reported in ref. [I]. In fig. 7 our results are compared with the A OOnO quasielastic data at 0.894 GeV [ref. [ll] (triangles), measured with a polarized deuteron beam and CH, target. This figure also contains A,,,, pn quasielastic data from ref. [9], measured at 0.891 GeV at KEK using an unpolar-

I I II I I I I1 ! I I II r I I

0.4 -

oono = Aooon -

- 0.80 GeV _

0 ---_-- -_---- ---- --_--__-___-__

-0.1 -

- 0.2 -

-0.3 -

- 0.4 -

-0.5’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ” 1’ ’ ’ ’ ’ ’ 0 30 60 90 120 150 180

8cM(deg)

Fig. 3. Analyzing power for np elastic and quasielastic scattering around 0.80 GeV. Meaning of symbols:

(closed circles) A.,,“. = A,,, at 0.80 GeV measured with the PPT; (crosses) Aoono at 0.80 GeV measured with the polarized proton beam and liquid-deuterium target, ref. [8]; (triangles) A,,,, = A,,,, at 0.794 GeV measured with the polarized deuteron beam and the PPT, ref. [S]; (open circles) A,,, at

0.775 GeV measured at LAMPF with an unpolarized neutron beam and the PPT, ref. [71.


11 1 ’ 11 ’ 11 11 11 11 ” Ok- A oono=Aooon _

n-p

- 0.84 Gev

-0.2 -

-0.3-

-0.4-

I I, / II I I I I I I I II 11 -050 30 60 90 120 150 180

9,-M(deg)


(closed circles) A,,, = A,,, at 0.84 GeV measured with the PPT; (open circles) A,,,, at 0.84 GeV

measured with the CH, target; (crosses) A,,,, at 0.85 GeV measured with the polarized deuteron

beam and CH, target; (plusses) A,,, at 0.834 GeV. Experiment IKAR at SATURNE II, refs. [5,6].

ized proton beam and a polarized deuteron target. Results from the same experiment at 1.11 GeV are shown in fig. 12. In both figures they are denoted by plusses.

5. Conclusions

The analyzing power has been measured at twelve energies between 0.32 and 1.1 GeV using the SATURNE II polarized beam of free neutrons. The beam was

0.4 , , , , , , , , , , , / , , , I I

0.3 - Aoo no = Aooon -

n-p

0.2- 0.86 GeV

-0.1 -

-0.2-

-0.3-

I I I I I I I I -“O 30 60 90 120 150 180

ecM(de9)

Fig. 5. Analyzing power A,,, = A,,, for np elastic scattering at 0.86 GeV measured with the PPT.

J. Ball et al. / Angular dependence (II) 50.5

1111,11,,,,,ll,,,-

a4-

L Aoono a3- n-p

0.2 - l 0.077 GeV _

0.1 - 'r l

()--_--___-_--__;___-__-__--__--_-__---_- *

-o.l- .

-0.2 -

-0.3-

-040 I I 30 1 I I 60 I I , 90 I 120 150 180

8CM (deg)

Fig. 6. Analyzing power A”.“,, = A,,,, for np elastic scattering at 0.877 GeV measured with the CH,

target.

scattered either on the Saclay frozen-spin polarized proton target (at nine energies) or on the CH, target (at three energies). At four energies are given independent data taken with an additional CH, target positioned close to the main


(closed circles) A,,, = A,,,, at 0.88 GeV measured with the PPT, (triangles) A..“,, at 0.894 GeV measured with the polarized deuteron beam and the PPT. ref. [ll]; (plusses) A,, at 0.891 GeV

measured with a proton beam and the polarized deuteron target, ref. [91.


0.4, I , 1 , , 1 , , / , / , , , , , ,

A oono q Aooon _

n-p

0.91 GeV -

- O.l- -

-0.2 -

-0.3-

-0.4 - I I I I I I I 1 ,

0 30 60 90 120 150 180

@cM(deg)

Fig. 8. Analyzing power Aoono = A,,, for np elastic scattering at 0.91 GeV measured with the PPT.

target. At all energies high statistics of events could be obtained at forward angles where the neutrons are detected by the neutron-counter hodoscope. At backward- scattering angles, where neutrons are converted into protons by charge exchange in

I,, I ,-

cl4- Aoono =Aooon

-0.94 GeV

-0.1 -

-0.2-

-0.3-

-0.4- I I I I I I I I ,

0 30 60 90 120 150 180

@CM (deg I

Fig. 9. Analyzing power for np elastic and quasielastic scattering around 0.94 GeV. Meaning of symbols: (closed circles) A,,, = A,,, at 0.94 GeV measured with the PPT; (crosses) A,,, at 0.95 GeV measured with the polarized deuteron beam and CH, target, ref. [lo]; (plusses) A..,,. at 0.934 GeV.

Experiment IKAR at SATURNE II, refs. [5,61.


60 90 120 150 180 8C.,, (deg)

Fig. 10. Analyzing power for np elastic and quasielastic scattering around 1.0 GeV. Meaning of symbols: (closed circles) A,,, = A_, at I.00 GeV measured with the PPT; (open circles) A,,,, at 1.00 GeV measured with the CH, target; (crosses) A,,,, at 1 .OO GeV measured with the polarized deuteron beam and CH, target, ref. IlO]; fplussesl A,,, at 0.985 GeV. Experiment IKAR at SATURNE II, ref.

[5,61.

a carbon block, the experimental errors are larger. The shape of the measured angular dependence changes very slowly with energy. Independent results obtained at the same energy are consistent and agree we11 with existing data.

The present results considerably contribute to the np * np data base. They will be used to extend the phase-shift analysis towards higher energies and for a direct reconstruction of the np scattering amplitudes.

0.4, I I I I 8 , , , I j , , , , , , , .

0.3 -

0.2 -

0.1 -

++t

ii

Aoono=Aooon _

n-p 1.08 GeV -

()____-__------_

ii

_--_ ----_---_~--__---

-O.l-

-0.2 - t

-0.3- \

III/11 /,//I ,,*I, i, 0 30 60 90 120 150 l&o

B&ieg)

Fig. 11. Analyzing power A..“. = A,,,, for np elastic scattering at 1.08 GeV measured with the PPT.

50%

0.5 -

0.4 -

0.3 -

0.2 -

0.1 -

O---

-0.1 -

-0.2-

-0.3 -

-0.4 ,

_-

f-t

J

_ __-------- _ ___ ____ -----_- _______ _

‘1~’ i 1 t li +

!_I 1 I( 1 I I / II IllI I , I 1 I 1

0 30 $0 so ’ 120 150 180

6CM(deg)


(closed circles) A,,,, = Aooon at 1.10 GeV, measured with the PPT; (open circles) A,,,, at 1.10 GeV, measured with the CH, target; (plusses) A,,,, at 1.11 GeV measured with the unpolarized proton

beam and the polarized deuteron target, ref. [9].

We acknowledge J. Arvieux, R. Beurtey, P.A. Chamouard, A. Fleury, E. Heer, T. Kirk, J.M. Laget, J. Saudinos and A. Yokosawa for support of this work. Discussions with J. Deregel, L.G. Greeniaus, J.M. Lagniel, C. Lechanoine-Leluc, M.W. McNaughton, G. Milleret and Y. Terrien have solved several problems. The exploitation of the polarized target owes a lot to G. Guilher, Ph. Marlet and J.

O.l* 1 I 1 1 t t , I 1 I I -

- Aoono(n-pf 0.363 GeV - 0 ________-----_______---------- _

Fig. 13. Analyzing power for np elastic and quasielastic scattering measured with the CH, and carbon targets at 0.363 GeV. Meaning of symbols: (closed circles) A,,, measured with the CH, target; (open

circles) A,,, measured with the C target.

.I. Ball et al. / Angular dependence (II) 509

Mommejat. We thank M. Arignon, T. Lambert, E. Perrin, F. Petit, J. Poupard and J.P. Richeux for their efficient help in preparation of the experiment. This work was partly supported by the Swiss National Science Foundation and by the US Department of Energy Contract No. W-31-109-ENG-38.

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[IS] J. Ball, Ph.D. Thesis, Faculty of Science, University of Paris, Orsay, No. 2132

angular dependence of analyzing power in np elastic scattering between 0.312 and 1.10 gev

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