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[en] A low-lying state in "1"3"1In_8_2, the one-proton hole nucleus with respect to double magic "1"3"2Sn, was observed by its γ decay to the I"π 1/2"- β-emitting isomer. We identify the new state at an excitation energy of E_λ= 1353 keV, which was populated both in the β decay of "1"3"1Cd_8_3 and after β-delayed neutron emission from "1"3"2Cd_8_4, as the previously unknown πp_3_/_2 single-hole state with respect to the "1"3"2Sn core. Exploiting this crucial new experimental information, shell-model calculations were performed to study the structure of experimentally inaccessible N = 82 isotones below "1"3"2Sn. The results evidence a surprising absence of proton subshell closures along the chain of N = 82 isotones. The consequences of this finding for the evolution of the N = 82 shell gap along the r-process path are discussed. (authors)
[en] We discuss shell-model calculations based on the use of low-momentum interactions derived from the free-space nucleon-nucleon potential. A main feature of this approach is the construction of a smooth potential, Vlow-k, defined within a given momentum cutoff. As a practical application of the theoretical framework, we present some selected results of our current study of nuclei around doubly magic 132Sn and 208Pb which have been obtained starting from the CD-Bonn potential. Focusing attention on the similarity between the spectroscopy of these two regions, we show that it emerges quite naturally from our effective interactions without use of any adjustable parameter.
[en] The present work reports the measurement of level lifetime for few of the low lying excited levels in 131,132I and 131,132Xe using slope, deconvolution and Generalized Centroid Difference (GCD) techniques
[en] Isomer and beta-decay spectroscopy are performed in one of the key regions of the nuclear chart, namely around the doubly-magic 132Sn. In particular, neutron-rich nuclei beyond N=82, Z=50 are addressed in an overview of several accomplished measurements. The physics interest in these investigations spans from single-particle excitations, orbital evolution, collectivity and onset of deformation to first-forbidden and Gamow-Teller strength at large N/Z ratios. Results from purely prompt, isomeric and beta-decay data of fission products, studied at different experimental facilities will be shown. In addition, future plans for a continuation of these investigations, especially on isomers and their nuclear moments will be presented together with the associated ongoing works. (author)