Abstract
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 + 1 2 case are attributed to quasi-deuteron configurations. The B(M1) values for the j = l − 1 2 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 J π = 0 1 +, 2 1 +, 4 1 + T=1 and J π = 1 1 +, 3 1 +, T=0 states in 54Co are identified as predominantly πf 7 2 −1 × νf 7 2 −1 quasi-deuteron states.
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