(p,) reaction via transfer reaction of mirror nuclei and direct measurement of 11C(p,)12N at DRAGON Bing Guo

For nuclear astrophysics groupChina Institute of Atomic Energy

The Sixth China Japan Joint Nuclear Physics Symposium

May, 2006

Content (p,) reaction via transfer reaction

of mirror nuclei. 1. Mirror symmetry 2. 8Li(d,p)9Li and 8B(p,)9C

3. 26Mg(d,p)27Mg and 26Si(p,)27P

Direct measurement of 11C(p,)12N at DRAGON.

A(d,p)B angular distribution

Neutron ANC of virtual decay B → A + n

Proton ANC of virtual decay D → C + p and proton width

Astrophysical S-factor and rate of the C(p,)D reaction

Mirror symmetryIf A and C, B and D are mirror nuclei, then

DWBA analysis

Radiative capture theory

Charge symmetry

Neutron ANC from A(d,p)B

L. D. Blokhintsev et al., Sov. J. Part. Nucl. 8, 485 (1977).

is the ANC of d → p + n.is the ANC of B → A + n.

Proton ANC and width of mirror nucleus D

N. Timofeyuk et al., PRL. 91, 232501 (2003). BACK

8Li(d,p)9Li and 8B(p,)9C

Motivation:8Li(d,p)9Li is one of important reactions in the

inhomogeneous big bang models*, can serve as a surrogate reaction to extract the 8B(p,)9C and 8Li(n,)9Li reaction rates for the direct capture.

*T. Kajino and R. N. Boyd, Astrophys. J. 359, 267 (1990).

Secondary beam facility

X. Bai et al., NPA 588, 273c (1995).W. Liu et al., NIM B204, 62 (2003).

Dipole Gas target

Quadrupoles

Wien Filter

MCP1

MCP2Reaction

Chamber

Experimental setup

9Li particle identification

Angular distribution of 8Li(d,p)9Li

=7.9 ± 2.0 mb

Z.H. Li, W.P. Liu, X.X. Bai, B. Guo et al., Phys. Rev. C 71, 052801(R) (2005).

8B(p,)9C

7Be(p,)8B(p,)9C(a,p)12N(+)12C is one of possible alternative paths to 3a process ；

8B(p,)9C may play an important role in the evolution of massive stars with very low metallicities.

M. Wiescher et al., Astrophys. J. 343, 352 (1989).G.M. Fuller et al., Astrophys. J. 307, 675 (1986).

Motivation:

Current status and our proposal on 8B(p,)9C

Several theoretical studies; Proton transfer 8B(d,n)9C reaction by RIKEN; Coulomb dissociation measurement by RIKEN; Knockout reactions of 9C by Texas A&M

University and Michigan State University; Neutron transfer 8Li(d,p)9Li reaction and charge

symmetry of mirror nuclei.

8Li(d,p)9Li is peripheral?

9 2 11,3/ 2( ) 1.33 0.33LiC fm

9 2 11,3/ 2( ) 1.14 0.29CC fm

Astrophysical S-factor of 8B(p,)9C

This work presents an independent examination to the existing studies.

M. Wiescher et al., APJ. 343, 352 (1989).P. Descouvemont, NPA 646, 261 (1999).P. Mohr, PRC 67, 065802 (2003).D. Beaumel et al., PLB 514, 226 (2001).L. Trache et al., PRC 66, 035801 (2002).T. Motobayashi, NPA 719, 65c (2003).J. Enders et al., PRC 67, 064301 (2003).

8B(p,)9C reaction rate

B. Guo, Z.H. Li, W.P. Liu et al., Nucl. Phys. A 761, 162 (2005).

BACK

26Al5+7.4×105 yr

26Mg 0+ 0

2+ 1.809

The 1.809 MeV -ray is an ideal observable for nova and x-ray burst.

26Si(p,)27P reaction

J. José et al., Astrophys. J. 520, 347 (1999).O. Koike et al., Astron. Astrophys. 342, 464 (1999).

Current status and our proposal on 26Si(p,)27P

Several theoretical studies ； Measurement of resonant capture via Coulomb

dissociation method by RIKEN ； No measurement of direct capture ；

Determination of direct and resonant captures through neutron transfer reaction 26Mg(d,p)27Mg and charge symmetry of mirror nuclei.

Angular distribution of 26Mg(d,p)27Mg

26Mg(d,p)27Mg is peripheral?

ANCs of 27Mg and 27P

27P

Proton widths for 27P

H. Herndl et al., Phys. Rev. C 52, 1078 (1995).J. A. Caggiano et al., Phys. Rev. C 64, 025802 (2001).

Astrophysical S-factor of 26Si(p,)27P

26Si(p,)27P reaction rate

B. Guo, Z.H. Li, X.X. Bai et al., Phys. Rev. C 73, 048801 (2006).

More reactions we can do 6Li(d,p)7Li → 6Li(p,)7Be 7Li(d,p)8Li → 7Be(p,)8B 11B(d,p)12B → 11C(p,)12N 12C(d,p)13C → 12C(p,)13N 13C(d,p)14C → 13N(p,)14O 14N(d,p)15N → 14N(p,)15O …… BAC

K

Direct measurement of 11C(p,)12N at DRAGON

Alternative way to the 3a process for transforming material from the pp chains to the CNO.

Play an important role in the evolution of Pop Ⅲ stars.

Indirect data have large discrepancies.

Existing indirect results of 11C(p,)12N

E983@DRAGON proposed by Prof. W.P. Liu

ISOL approach(500 MeV proton) , successful producing beams such as 8,9,11Li, 21Na.

Some difficulty producing beams of volatile elements such as 11C, 13N, 15O and 19Ne in required intensities (~108/s).

Production of 11C

Alternative approach - using 13 MeV proton beam

from TR13

ProductionChemical or physical separation

Transfer to OLIS

OLIS ionizationISAC RB

Intensity vs. collection time

Run No.

Sample radioactivit

y (mCi)

Beam intensity(ions/s)

ECR efficiency

1 15.0 ± 1.5 (9.9 ± 0.4) ×106 (1.9 ± 0.2) %

Beam of 11C were produced successfully. Beam intensity ~6×108 ions/s when 11C radioactivity of (1 Ci) produced by the TR13 medical cyclotron.

• Produce 11C (and other isotopes) without using the 500 MeV p+ beam is possible.

• The beam intensity can meet the needs of radiative proton capture study using DRAGON.

• The limitation is efficiency of the ion source.

Conclusions of 11C production

M. Trinczek, S. Lapi, B. Guo et al., Can. J. Phys., (in press).

Research Team of Nuclear Astrophysics at CIAE

Bing Guo

Gang Lian

Weiping Liu

Xixiang Bai

Baoxiang Wang

Sheng Zeng

Zhihong Li

Shengquan Yan

Yongshou Chen Nengchuan Shu

Kaisu Wu

Youbao Wang

Experiment

Theoretical

Jun Su

Thanks ！