future for (stopped) rising.....the road to despec
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Future for (Stopped) RISING .....the road to
DESPEC.
D. Rudolph et al., RISING, Feb/Mar'06
Stopped Rising Array @ GSI: 15 x 7 element CLUSTERsPhotopeak efficiency ~11% at 1.3 MeV....best array in the world for such studies....bar none.
γγ Coincidence Spectra
D. RudolphD. Rudolph
Decay Scheme of 54Ni
D. RudolphD. Rudolph
Fission and fragmentation studies in A=130 region
130130CdCd
Many new isomersNew systematics Isomeric ratios from two reaction mechanism
131131InIn
100Sn vs 132SnH. Grawe: N=50 TBME scaled by (88/132)1/3 to N=82 SPE from 99In and 131In, respectively
S. Pietri et al.,RISING data 107Ag beam
86Tc
88Zr
Cd
Ga
Possible Physics to be addressed by Next (Isomer) Campaign?
• 238U beam....– 128Pd82 (96Pd50 mirror.... holes in N=82)– 202Os126....(holes in N=126)– Neutron-rich ~Pb (212-214Pb)....– 190W-170Dy (K-isomerism as a probe of def.)– Highest spins in fragmentation (> 144Tb)....
• 208Pb at high spins? I ~ 30 hbar?
– Fission fragment studies, shape evolution (N~60-70...Gary Simpson....)
• Other beams..– Isospin Sym. Tz=-2, 52Ni24:52Cr28 ....(Dirk Rudolph...)– N=Z ~100Sn (Bob Wadsworth, Magda Gorska...)
March 2006:148Tb I=27ћ 147Gd I=49/2ћ
Highest angular momentum states observed in fragmentation
I nucleus published year and first author:19/2 43Sc 1994 W-D Schmidt-Ott et al.10 54Fe 1995 R. Grzywacz et al.25/2 205Tl, 205Pb 1998 M. Pfutzner et al.35/2 175Hf, 179W, 181Re 2002 M. Pfutzner et al.43/2 215Ra 2006 Zs. Podolyák et al.27 148Tb 2007(?) E. Werner-Malento, Zs. Podolyák et al.
Ang
ular
mom
entu
m
0
5
10
15
20
25
30
1990 1995 2000 2005 2010
year of publication
148Tb
Open questions in nuclear physics
limit of existence, neutron skins, change in the shell structure, weak binding effects, nucleosynthesis …
Far future: FAIR
yields
Future
β decay: RISING active stopper (2007)(J.Benlliure, P. Regan et al.)
isomeric decay: CERN-ISOLDE
Advanced
GAmmaTracking
Array
High photo-peak efficiencyGood angular resolution <1degree FWHM=10 keV at β=50% = 5 keV at β=20%Ideal for high velocity beams
Grant success:• Advanced Implantation Detector Array (AIDA)• Part of UK contribution to FAIR• EPSRC grant to:
Universities of Edinburgh and Liverpool Daresbury and Rutherford• Grant award £2.25M• 4 year grant
DESPEC ‘Active Stopper’
(AIDA) funded in the UK
AIDA
Si strip detectors ASIC readoutMicroelectronics
Electronics and DAQ
Stopped Rising Array @ GSI: 15 x 7 element CLUSTERsPhotopeak efficiency ~11% at 1.3 MeV...next array must be even better (....for Stopped Beams.)
1) Daresbury Laboratory UK 2) University of Liverpool UK 3) University of Surrey UK 4) UAM Madrid Spain 5) Universidad de Salamanca Spain 6) IFIC Valencia Spain 7) GSI Darmstadt Germany 8) Universit ät zu Köln Germany 9) IFIN-HH Bucharest Romania10) University of Camerino Italy11) University of Jyvaskyla Finland12) University of Sofia Bulgaria13) Royal Inst. of Tech., Stockholm Sweden14) IReS Strasbourg France
Members of the DESPEC Ge array working group
• 11 February, 2005 GSI, Germany
• 7 April, 2005 Surrey, UK
• 4 November, 2005 Madrid, Spain
• 22 February, 2006 GSI, Germany
Meetings
http://www.ft.uam.es/Nuclear/Nuc_Exp_Inv_DESPEC_home.htm
DESPEC ‘active stopper’ funded in last round (Liv. + Edin. + DL. + RAL)
Alternative: array of 6/8 Clover detectors
DESPEC gamma-ray arraymajor UK Grant to be:Surrey, Liverpool, CLRC,Daresbury, York, Brighton, Manchester, Paisley….
Array of stacks of seg-mented planar Ge detectors
Array of CLOVER detectors
?• prototype• simulations
THE question ......
DESPEC (DEcay SPECtrocsopy)
γ-ray tracking cluster
Stanislav TashenovGSI, Darmstadt
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