Phys. Rev. C 74, 024309 (2006) [15 pages]

The (t,³He) and (³He, t) reactions as probes of Gamow-Teller strength

Abstract

References

Citing Articles (23)

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R. G. T. Zegers et al.
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R. G. T. Zegers^1,2,3, H. Akimune⁴, Sam M. Austin^1,3, D. Bazin¹, A. M.van den Berg⁵, G. P. A. Berg^6,7, B. A. Brown^1,2,3, J. Brown⁸, A. L. Cole^1,3, I. Daito⁹, Y. Fujita¹⁰, M. Fujiwara^11,12, S. Galès¹³, M. N. Harakeh⁵, H. Hashimoto¹², R. Hayami¹⁴, G. W. Hitt^1,2, M. E. Howard^3,15, M. Itoh¹⁶, J. Jänecke¹⁷, T. Kawabata¹⁸, K. Kawase¹², M. Kinoshita⁴, T. Nakamura¹⁹, K. Nakanishi¹², S. Nakayama¹⁴, S. Okumura¹², W. A. Richter²⁰, D. A. Roberts¹⁷, B. M. Sherrill^1,2,3, Y. Shimbara^1,3, M. Steiner¹, M. Uchida²¹, H. Ueno²², T. Yamagata¹⁹, and M. Yosoi¹²
¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
²Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
³Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
⁴Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan
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
⁹Advanced Photon Research Center, Japan Atomic Research Institute, Kizu, Kyoto 619-0215, Japan
¹⁰Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
¹¹Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215, Japan
¹²Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
¹³Institut de Physique Nucléaire, IN2P3-CNRS, Orsay, France
¹⁴Department of Physics, University of Tokushima, Tokushima 770-8502, Japan
¹⁵Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
¹⁶Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578, Japan
¹⁷Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
¹⁸Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
¹⁹Tokyo Institute of Technology, Megro, Tokyo 152-8550, Japan
²⁰Department of Physics, University of Western Cape, Bellville 7530, South Africa
²¹Tokyo Institute of Technology, 2-12-1 O-Okayama, Tokyo 152-8550, Japan
²²Applied Nuclear Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

Received 29 September 2005; revised 21 December 2005; published 18 August 2006

It is shown via a study on a ²⁶Mg target that the (t,³He) 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 ²⁶Mg(³He, 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 ²⁶Mg(t,³He) and ²⁶Mg(³He, t) are compared with those from ²⁶Mg(d,²He) and ²⁶Mg(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,³He) 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,³He) and (³He, 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 ³He 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevC.74.024309

DOI:

10.1103/PhysRevC.74.024309

PACS:

25.40.Kv, 21.60.Cs, 25.55.Kr, 27.30.+t

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