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

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

A. L. Cole, H. Akimune, Sam M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, J. Brown, I. Daito, Y. Fujita, M. Fujiwara, S. Gupta, K. Hara, M. N. Harakeh, J. Jänecke, T. Kawabata, T. Nakamura, D. A. Roberts, B. M. Sherrill, M. Steiner, H. Ueno, and R. G. T. Zegers

Phys. Rev. C 74, 034333 – Published 29 September 2006

Abstract

Electron capture and β 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 ${}^{58}{Co}$ from the ${}^{58}{Ni}$ ( $t$ , ${}^{3}{He}$ ) reaction with a secondary triton beam of an intensity of $~ 10^{6}$ pps at 115 MeV/nucleon and a resolution of $~ 250$ keV. Previous measurements with the ${}^{58}{Ni}$ $(n, p)$ and the ${}^{58}{Ni}$ ( $d$ , ${}^{2}{He}$ ) 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 ${}^{58}{Ni}$ ( ${}^{3}{He}$ , $t$ ) are described and turn out to be nonnegligible due to large interferences between the $Δ L = 0, Δ S = 1$ Gamow-Teller amplitude and the $Δ L = 2, Δ S = 1$ amplitude.

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Received 20 March 2006

DOI:https://doi.org/10.1103/PhysRevC.74.034333

Authors & Affiliations

A. L. Cole^1,2,*, H. Akimune³, Sam M. Austin^1,2,4, D. Bazin¹, A. M. van den Berg⁵, G. P. A. Berg^6,7, J. Brown⁸, I. Daito⁹, Y. Fujita¹⁰, M. Fujiwara^9,11, S. Gupta^1,2, K. Hara¹¹, M. N. Harakeh¹², J. Jänecke¹³, T. Kawabata¹⁴, T. Nakamura¹⁵, D. A. Roberts¹³, B. M. Sherrill^1,2,4, M. Steiner¹, H. Ueno¹⁶, and R. G. T. Zegers^1,2,4,†

¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
²Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics, Konan University, 8-9-1 Okamoto Higashinda, Kobe, Hyogo, 658-8501, Japan
⁴Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁵Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
⁶Department of Physics, University of Notre Dame, Indiana 46556-5670, USA
⁷Joint Institute for Nuclear Astrophysics, University of Notre Dame, Indiana 46556-5670, USA
⁸Department of Physics, Wabash College, Crawfordsville, Indiana 47933, USA
⁹Kansai Photon Science Institute, Japan Atomic Research Institute, Kizu Kyoto 619-0215, Japan
¹⁰Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
¹¹Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
¹²Kernfysisch Versneller Instituut, Zernikelaan 25 9747 AA Groningen, The Netherlands
¹³Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
¹⁴Center for Nuclear Study, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
¹⁵Tokyo Institute of Technology, 2-12-1 O-Okayama, Tokyo 152-8550, Japan
¹⁶Applied Nuclear Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

^*Present address: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
^†Electronic address: zegers@nscl.msu.edu

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Vol. 74, Iss. 3 — September 2006

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Physical Review C

covering nuclear physics

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

A. L. Cole, H. Akimune, Sam M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, J. Brown, I. Daito, Y. Fujita, M. Fujiwara, S. Gupta, K. Hara, M. N. Harakeh, J. Jänecke, T. Kawabata, T. Nakamura, D. A. Roberts, B. M. Sherrill, M. Steiner, H. Ueno, and R. G. T. Zegers

Phys. Rev. C 74, 034333 – Published 29 September 2006

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Physical Review C

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Measurement of the Gamow-Teller strength distribution in Co58 via the Ni58(t,He3) reaction at 115 MeV/nucleon

A. L. Cole, H. Akimune, Sam M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, J. Brown, I. Daito, Y. Fujita, M. Fujiwara, S. Gupta, K. Hara, M. N. Harakeh, J. Jänecke, T. Kawabata, T. Nakamura, D. A. Roberts, B. M. Sherrill, M. Steiner, H. Ueno, and R. G. T. Zegers

Phys. Rev. C 74, 034333 – Published 29 September 2006

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