First spectroscopic information from even-even nuclei in the region "southeast" of Sn 132: Neutron-excitation dominance of the 21+ state in Cd 132

Wang, H. and Aoi, N. and Takeuchi, S. and Matsushita, M. and Motobayashi, T. and Dombrádi, Zsolt and Kunné Sohler, Dorottya and Vajta, Zsolt (2016) First spectroscopic information from even-even nuclei in the region "southeast" of Sn 132: Neutron-excitation dominance of the 21+ state in Cd 132. PHYSICAL REVIEW C, 94 (5). 051301. ISSN 0556-2813

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Abstract

The neutron-rich nucleus Cd132 has been studied at the RIKEN Radioactive Isotope Beam Factory using in-beam γ-ray spectroscopy with two-proton removal reactions from Sn134. A γ-ray transition was observed at 618(8) keV and was assigned to the 21+→0g.s.+ decay. The 21+ state provides the first spectroscopic information from the even-even nuclei located in the region "southeast" of the doubly magic nucleus Sn132. By comparing with the 21+ excitation energies in the semimagic nuclei Sn134 and Cd130, it is found that neutron excitations dominate the 21+ state in Cd132, in a similar manner to Te136. The results are discussed in terms of proton-neutron configuration mixing. © 2016 American Physical Society.

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