Studies of Semi-magic Tin Nuclei Using Large γ-ray Spectrometers

Speaker

Corina Andreoiu, Simon Fraser University

Abstract

The tin isotopes, with their magic number of 50 protons (Z) and the highest number of stable isotopes (10), represent one of the most studied isotopic chain of nuclei. They display a nearly constant energy of the first excited state, which is a signature of their established magicity. At extreme proton-to-neutron ratios the doubly-magic 100Sn and 132Sn nuclei are benchmark nuclei for models of nuclear structure; on the other hand the 116Sn nucleus which is situated at the mid shell between the neutron (N) closed shells N=50 and N=82 is one of the best candidates for detailed spectroscopic study of intruder states. The neutron-rich tin nuclei allow to study the evolution of magic numbers across a wide range on masses, while the half-lives of N=82 nuclei below doubly-magic Sn are key input parameters astrophysical r-process calculations, and they play an important role in the formation and shape of the second r-process abundance peak.