The (t,He3) and (He3, t) reactions as probes of Gamow-Teller strength

R. G.T. Zegers, H. Akimune, Sam M. Austin, D. Bazin, A. M.Van Den Berg, G. P.A. Berg, B. A. Brown, J. Brown, A. L. Cole, I. Daito, Y. Fujita, M. Fujiwara, S. Galès, M. N. Harakeh, H. Hashimoto, R. Hayami, G. W. Hitt, M. E. Howard, M. Itoh, J. JäneckeT. Kawabata, K. Kawase, M. Kinoshita, T. Nakamura, K. Nakanishi, S. Nakayama, S. Okumura, W. A. Richter, D. A. Roberts, B. M. Sherrill, Y. Shimbara, M. Steiner, M. Uchida, H. Ueno, T. Yamagata, M. Yosoi

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Abstract

It is shown via a study on a Mg26 target that the (t,He3) reaction at 115 MeV/nucleon reaction is an accurate probe for extracting Gamow-Teller transition strengths. To do so, the data are complemented by results from the Mg26(He3, t) reaction at 140 MeV/nucleon that allows for a comparison of T=2 analog states excited via the mirror reactions. Extracted Gamow-Teller strengths from Mg26(t,He3) and Mg26(He3, t) are compared with those from Mg26(d,He2) and Mg26(p,n) studies, respectively. A good correspondence is found, indicating probe independence of the strength extraction. Furthermore, we test shell-model calculations using the new USD-05B interaction in the sd-model space and show that it reproduces the experimental Gamow-Teller strength distributions well. In anticipation of further (t,He3) experiments on medium-heavy nuclei aimed at determining weak-interaction rates of relevance for stellar evolution, a second goal of this work is to improve the understanding of the (t,He3) and (He3, t) reaction mechanisms at intermediate energies because detailed studies are scarce. The distorted-wave Born approximation is employed, taking into account the composite structures of the He3 and triton particles. The reaction model provides the means to explain systematic uncertainties at the 10%-20% level in the extraction of Gamow-Teller strengths as being because of interference between Gamow-Teller ΔL=0,ΔS=1 and ΔL=2,ΔS=1 amplitudes that both contribute to transitions from 0+ to 1+ states.

Original languageEnglish
Article number024309
JournalPhysical Review C - Nuclear Physics
Volume74
Issue number2
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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