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Phys. Rev. Lett. 92, 062502 (2004) [4 pages]

Evidence for the Existence of the [2   0   2]3/2 Deformed Band in Mirror Nuclei 25Mg and 25Al

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Y. Fujita1,*, I. Hamamoto2, H. Fujita3, Y. Shimbara1, T. Adachi1, G. P. A. Berg3,4, K. Fujita3, K. Hatanaka3, J. Kamiya3,†, K. Nakanishi3, Y. Sakemi3, Y. Shimizu3, M. Uchida5, T. Wakasa3,‡, and M. Yosoi5
1Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
2Division of Mathematical Physics, LTH, University of Lund, P.O. Box 118, S-22100 Lund, Sweden
3Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
4Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands
5Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan

Received 15 October 2003; published 13 February 2004

After 50 years of its prediction, the highest-lying [2  0  2]3/2 orbit among the six Nilsson single-particle orbits originating from the sd shells in prolately deformed nuclei and the rotational band on this orbit were identified. The band members were observed in 25Al at excitation energies of 6–7.5 MeV in a high-resolution 25Mg(3He,t) charge-exchange reaction at 0° having a strong selectivity for Gamow-Teller transitions. In the comparison with the analogous M1 transitions in 25Mg, the Jπ=3/2+ bandhead state and the excited 5/2+ and 7/2+ members were clearly assigned.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.062502
DOI:
10.1103/PhysRevLett.92.062502
PACS:
21.10.Re, 21.10.Pc, 25.55.Kr, 27.30.+t

*Email address: fujita@rcnp.osaka-u.ac.jp

†Present address: JAERI, Tokai, Ibaraki 319-1195, Japan.

‡Present address: Department of Physics, Kyushu University, Higashi, Fukuoka 812-8581, Japan.

 
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