Ground-state configuration of the N=157 nucleus 259No

M. Asai, K. Tsukada, M. Sakama, H. Haba, T. Ichikawa, Y. Ishii, A. Toyoshima, T. Ishii, I. Nishinaka, Y. Nagame, Y. Kasamatsu, M. Shibata, Y. Kojima, H. Hayashi

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Abstract

The ground-state configuration of the N=157 nucleus 259No has been identified through α-γ coincidence and α-singles measurements. Three γ transitions were observed for the first time in the α decay of 259No, and its decay scheme was established. The neutron 9/2 +[615] configuration was assigned to the ground state of 259No as well as to the 231.4 keV level in 255Fm. Ground-state deformations and neutron single-particle energies in Z=102 isotopes were calculated with the macroscopic-microscopic model. The 9/2+[615] orbital was calculated to be the highest among the five orbitals between the N=152 and 162 deformed shell gaps, which is consistent with the experimental one-quasiparticle energies in N=153 and 155 isotones, but is inconsistent with the present experimental result of the 9/2+[615] ground state at N=157. To reproduce the 9/2+[615] ground state at N=157, the order of the neutron orbitals should be different between the N=153 and 157 isotones.

Original languageEnglish
Article number014332
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number1
DOIs
Publication statusPublished - Jan 23 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Asai, M., Tsukada, K., Sakama, M., Haba, H., Ichikawa, T., Ishii, Y., Toyoshima, A., Ishii, T., Nishinaka, I., Nagame, Y., Kasamatsu, Y., Shibata, M., Kojima, Y., & Hayashi, H. (2013). Ground-state configuration of the N=157 nucleus 259No. Physical Review C - Nuclear Physics, 87(1), [014332]. https://doi.org/10.1103/PhysRevC.87.014332