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Low spin structure of odd-odd N=Z nuclei

2000; Elsevier BV; Volume: 44; Linguagem: Inglês

10.1016/s0146-6410(00)00054-5

1873-2224

P. von Brentano, A. F. Lisetskiy, Imke Schneider, C. Frießner, R. V. Jolos, N. Pietralla, A. Schmidt, R. V. Jolos,

Quantum Chromodynamics and Particle Interactions

Isovector M1 transitions between low-lying T=1 and T=0 states in odd-odd N=Z nuclei are discussed. Simple analytical expressions for M1 transition strengths are given in single-j-shell approximation. The large B(M1) values for the j = l + 12 case are attributed to quasi-deuteron configurations. The B(M1) values for the j = l − 12 case are found to be small due to a cancellation of spin and orbital parts of the M1 matrix element. The experimental data on low spin states in the odd-odd nuclei 54Co and 46V investigated with the 54Fe(p, nγ)54Co and 46Ti(p, nγ)46V fusion reactions at the EN-tandem accelerator in Cologne are reported. The Jπ = 01+, 21+, 41+ T=1 and Jπ = 11+, 31+, T=0 states in 54Co are identified as predominantly πf72−1 × νf72−1quasi-deuteron states.