Measurement of the Gamow-Teller strength distribution in {sup 58}Co via the {sup 58}Ni(t,{sup 3}He) reaction at 115 MeV/nucleon

Journal Article · Fri Sep 15 00:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.034333· OSTI ID:20863805

Cole, A L; Gupta, S ^[1]; Akimune, H ^[2]; Austin, Sam M; Sherrill, B M; Zegers, R G. T. ^[1]; Bazin, D; Steiner, M ^[1]; Berg, A M. van den ^[3]; Berg, G P. A. ^[4]; Brown, J ^[5]; Daito, I ^[6]; Fujita, Y ^[7]; Fujiwara, M ^[6]; Hara, K ^[8]; Harakeh, M N ^[9]; Jaenecke, J ^[10]

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1. National Superconducting Cyclotron Laboratory, Michigan State Univ., East Lansing, Michigan 48824-1321 (United States)
2. Dept. of Physics, Konan Univ., 8-9-1 Okamoto Higashinda, Kobe, Hyogo, 658-8501 (Japan)
3. Kernfysisch Versneller Instituut, Univ. of Groningen, Zernikelaan 25, 9747 AA Groningen (Netherlands)
4. Dept. of Physics, Univ. of Notre Dame, Indiana 46556-5670 (United States)
5. Dept. of Physics, Wabash College, Crawfordsville, Indiana 47933 (United States)
6. Kansai Photon Science Inst., Japan Atomic Research Inst., Kizu Kyoto 619-0215 (Japan)
7. Dept. of Physics, Osaka Univ., Toyonaka, Osaka 560-0043 (Japan)
8. Research Center for Nuclear Physics, Osaka Univ., Ibaraki, Osaka 567-0047 (Japan)
9. Kernfysisch Versneller Instituut, Zernikelaan 25 9747 AA Groningen (Netherlands)
10. Dept. of Physics, Univ. of Michigan, Ann Arbor, Michigan 48109-1040 (United States)

Electron capture and {beta} decay play important roles in the evolution of presupernovae stars and their eventual core collapse. These rates are normally predicted through shell-model calculations. Experimentally determined strength distributions from charge-exchange reactions are needed to test modern shell-model calculations. We report on the measurement of the Gamow-Teller strength distribution in {sup 58}Co from the {sup 58}Ni(t,{sup 3}He) reaction with a secondary triton beam of an intensity of {approx}10{sup 6} pps at 115 MeV/nucleon and a resolution of {approx}250 keV. Previous measurements with the {sup 58}Ni(n,p) and the {sup 58}Ni(d,{sup 2}He) reactions were inconsistent with each other. Our results support the latter. We also compare the results to predictions of large-scale shell-model calculations using the KB3G and GXPF1 interactions and investigate the impact of differences between the various experiments and theories in terms of the weak rates in the stellar environment. Finally, the systematic uncertainties in the normalization of the strength distribution extracted from {sup 58}Ni({sup 3}He, t) are described and turn out to be nonnegligible due to large interferences between the {delta}L=0,{delta}S=1 Gamow-Teller amplitude and the {delta}L=2,{delta}S=1 amplitude.

• OSTI ID: 20863805
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 74, Issue 3; Other Information: DOI: 10.1103/PhysRevC.74.034333; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
BETA DECAY
CHARGE-EXCHANGE REACTIONS
COBALT 58
COMPARATIVE EVALUATIONS
DISTRIBUTION
ELECTRON CAPTURE
GAMOW-TELLER RULES
HELIUM 2
HELIUM 3
INTERFERENCE
KEV RANGE
MEV RANGE
NICKEL 58
NICKEL 58 TARGET
SHELL MODELS
TRITON BEAMS
TRITON REACTIONS