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Phys. Rev. C 78, 014314 (2008) [9 pages]

Spectroscopy of 24Al and extraction of Gamow-Teller strengths with the 24Mg(3He,t) reaction at 420 MeV

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R. G. T. Zegers1,2,3,*, R. Meharchand1,2,3, T. Adachi4, Sam M. Austin1,3, B. A. Brown1,2,3, Y. Fujita5, M. Fujiwara4,6, C. J. Guess1,2,3, H. Hashimoto4, K. Hatanaka4, M. E. Howard3,7, H. Matsubara4, K. Nakanishi4, T. Ohta4, H. Okamura4, Y. Sakemi4, Y. Shimbara1,3,†, Y. Shimizu4, C. Scholl8, A. Signoracci1,2, Y. Tameshige4, A. Tamii4, and M. Yosoi4
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
4Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
5Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
6Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215, Japan
7Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
8Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany

Received 22 March 2008; published 23 July 2008

The 24Mg(3He,t)24Al reaction was studied at E(3He)=420 MeV. An energy resolution of 35 keV was achieved. Gamow-Teller strengths to discrete levels in 24Al were extracted by using a recently developed empirical relationship for the proportionality between Gamow-Teller strengths and differential cross sections at zero momentum transfer. Except for small discrepancies for a few weak excitations, good agreement with previous 24Mg(p,n) data and nuclear-structure calculations using the USDA/B interactions in the sd shell-model space was found. The excitation energy of several levels in 24Al of significance for determination of the 23Mg(p,γ)24Al thermonuclear reaction rate were measured. Results are consistent with two of the three previous (3He,t) measurements, performed at much lower beam energies. However, a new state at Ex(24Al)=2.605(10) MeV was found and is the third state above the proton separation energy.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.014314
DOI:
10.1103/PhysRevC.78.014314
PACS:
25.55.Kr, 24.30.Gd, 26.30.-k, 27.30.+t

*zegers@nscl.msu.edu

†Current address: Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.

 
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