Nuclear structure study for the neutron-rich nuclei beyond 132Sn: In-beam gamma-ray spectroscopy of 136Sn and 132Cd
oleh: Wang He, Aoi Nori, Takeuchi Satoshi, Matsushita Masafumi, Doornenbal Pieter, Motobayashi Tohru, Steppenbeck David, Yoneda Kenichiro, Baba Hidetada, Dombrádi Zsolt, Kobayashi Kota, Kondo Yosuke, Lee Jenny, Liu Hong-Na, Minakata Ryogo, Nishimura Daiki, Otsu Hideaki, Sakurai Hiroyoshi, Sohler Dora, Sun Ye-Lei, Tian Zheng-Yang, Tanaka Ryuki, Vajta Zsolt, Yang Zai-Hong, Yamamoto Tetsuya, Ye Yan-Lin, Yokoyama Rin
| Format: | Article |
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| Diterbitkan: | EDP Sciences 2018-01-01 |
Deskripsi
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.