Abstract
The neutron-rich nuclei 136Sn and 132Cd have been studied in the purpose of nuclear structure for the nuclei beyond the doubly-magic nucleus 132Sn. The 2+1 → 0+ gs transitions were identified for these two nuclei using in-beam γ-ray spectroscopy in coincidence with one- and two-proton removal reactions, respectively, at the RIKEN Radioactive Isotope Beam Factory. The 2+ 1 state in 136Sn is found to be similar to that for 134Sn indicating the seniority scheme may also hold for the heavy tin isotopes beyond N = 82. For 132Cd, the 2+ 1 state provides the first spectroscopic information in the even-even nuclei locating in the region “southeast” of 132Sn and the result is discussed in terms of proton-neutron configuration mixing. In both these two nuclei, it was found that the valence neutrons play an essential role in their low-lying excitations.
Highlights
Nuclear structure study for the very neutron-rich isotopes is one of major topics in nuclear physics
We report on the 2+1 states in two neutron-rich nuclei: 136Sn (Z = 50, N = 86) following the tin isotopic chain and 132Cd (Z = 48, N = 84) along the
The experiment was performed at the Radioactive Isotope Beam Factory (RIBF) operated by the RIKEN Nishina Center and the Center for Nuclear Study, University of Tokyo
Summary
Nuclear structure study for the very neutron-rich isotopes is one of major topics in nuclear physics. Nuclei with a few valence particle and/or holes outside 132Sn (Z = 50, N = 82) have attract much attention as 132Sn is a doubly-magic nucleus while locating far away from the line of stability. It provides an opportunity to explore possible exotic nuclear structure beyond doubly-magic nucleus towards the neutron-drip line. The experimental studies are limited for the isotopes beyond N = 82 because of the difficulties in accessing this exotic region of the nuclear chart. Spectroscopic information, especially the first 2+ states (2+1 ) in the even-even nuclei reveal interesting features in this region.
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