Candidate magnetic rotational band in 109Ag
EUROPEAN PHYSICAL JOURNAL A(2020)
摘要
Excited states of Ag-109 have been investigated by in-beam gamma-ray spectroscopic techniques using the Pd-110(Li-7, alpha 4n)Ag-109 reaction at a beam energy of 46 MeV. The level scheme of (109)Agis significantly extended with the addition of more than 20 new gamma transitions. For the positive-parity yrast band, it is extended to 41/2(+) state and 2 (h) over bar higher than the earlier work. A negative-parity band decaying to the yrast band by eleven new linking transitions is identified, and several E2 crossover transitions of this band are observed, thereby confirming the spin-parity assignment and the ordering of dipole transitions above the I-pi = 17/2(-) level. Experimental total angular momenta, kinematical and dynamical moments of inertia, and B(M1)/B(E2) ratio for the negative-parity band are compared with the predictions of self-consistent titled axis cranking relativistic mean-field model. Based on the theoretical description and the observed characteristics, the negative-parity dipole band is suggested as a magnetic rotational band arising from shears mechanism.
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