The lifetime of the 376.7-keV level and shape coexistence in111Ag

Abstract

The half llfe of the 376.7-keY level in 111Ag, populated in the decay of iII Pd isomers, has been determined to be 16• ns.Compton-suppressed y-ray spectra and ~y coincidence spectra have also been taken.These data, combined with recent charged-particle transfer data establish 3/2 + as the spin and parity of the 376.7-keV 111Ag level. Our observed lifetime and y-ray branching can be interpreted as strong indications of shape isomerism in lliAg similar to that found in odd-mass In nuclides.

The islands of shape coexistence within the Elliott and the proxy-SU(3) Models

“…The implicit strong correlations in the f p shell, as well as the prediction of islands of shape coexistence in the heavier region of the nuclear chart [23] has expanded the experimental efforts towards consolidating the spectroscopic signatures of shape coexistence in nuclei with A ∼ 120 − 180. Experimental data in Mo [24], Ag [25], Cd [26], La [27], and recent measurements of lifetimes in neutron-deficient nuclei in the lead region [28,29] provide strong evidence of the onset of shape coexistence at neutron numbers near to 108. Given the large gap of knowledge about characteristic experimental signatures of shape coexistence, such as lifetimes and reduced matrix elements, in neutron-rich Ytterbium and Hafnium nuclei, there remain open questions on the universality of shape coexistence across the large shell forming above N = 82.…”