2002•Progress of Theoretical Physics SupplementRequires access
Isospin Symmetry in the Structure Study of Unstable Nuclei
Y. Fujita, G.P.A. Berg, A.D. Bacher, T. Black, C.C. Foster, H. Fujimura, H. Fujita, K. Hara, K. Hatanaka, J. Jänecke, J. Kamiya, K. Katori, T. Kawabata, W. Lozowski, T. Noro, D. A. Roberts, Y. Shimbara, E. J. Stephenson, Hiroshi Ueno, T. Yamanaka, M. Yosoi
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Abstract
Assuming isospin T is a good quantum number, the analog states of the low-lying states in T z = ±( T 0+1) nuclei can be found as excited T 0+1 states in T z = ± T 0 nuclei. Therefore, if T 0+1 states are identified in the excited region of T z = ± T 0 nuclei, the structure of unstable nuclei with T z = ±( T 0+1) can be deduced. We measured and compared the transition strengths to pairs of excited analog states in inelastic and charge-exchange reactions on the same target nucleus. The T values of these analog states were identified by using the fact that the transition strengths to them are different depending on T . The identification of T = 1/2 and 3/2 nature of analog M 1 and GT states in the mirror nuclei pair 27Al and 27Si is reported by comparing the transition strengths in high-resolution 27Al( p , p ′) and 27Al(3He, t )27Si reactions at 0°. The identified T = 3/2 states are analogous to the low-lying states of 27Mg, which plays an important role in r p -process of nucleosynthesis.