Candidate magnetic rotational band in 109Ag

• Published in: The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2020, Vol.56 (8)
• Main Authors: Ma, K. Y., Lu, J. B., Li, J., Ma, Y. J., Yang, D., Sun, W. J., Yang, Q. Y., Guan, X., Wang, J. Q., Pan, H. N., Wang, H., Cui, T. F., Zhang, D. M., Zhu, L. H., Wu, X. G., Zheng, Y., Li, C. B.
• Format: Article
• Language: English
• Subjects: Cranking; Crossovers; Dipoles; Hadrons; Heavy Ions; Moments of inertia; Nuclear Fusion; Nuclear Physics; Parity; Particle and Nuclear Physics; Physics; Physics and Astronomy; Regular Article - Experimental Physics
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/s10050-020-00213-w

Excited states of 109 Ag have been investigated by in-beam γ -ray spectroscopic techniques using the 110 Pd ( 7 Li , α 4 n ) 109 Ag reaction at a beam energy of 46 MeV. The level scheme of 109 Ag is significantly extended with the addition of more than 20 new γ transitions. For the positive-parity yrast band, it is extended to 41 / 2 + state and 2 ħ higher than the earlier work. A negative-parity band decaying to the yrast band by eleven new linking transitions is identified, and several E 2 crossover transitions of this band are observed, thereby confirming the spin-parity assignment and the ordering of dipole transitions above the I π = 17 / 2 - level. Experimental total angular momenta, kinematical and dynamical moments of inertia, and B ( M 1)/ B ( E 2) 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.