TY - JOUR
T1 - Ground-state configuration of the N=157 nucleus 259No
AU - Asai, M.
AU - Tsukada, K.
AU - Sakama, M.
AU - Haba, H.
AU - Ichikawa, T.
AU - Ishii, Y.
AU - Toyoshima, A.
AU - Ishii, T.
AU - Nishinaka, I.
AU - Nagame, Y.
AU - Kasamatsu, Y.
AU - Shibata, M.
AU - Kojima, Y.
AU - Hayashi, H.
PY - 2013/1/23
Y1 - 2013/1/23
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevC.87.014332
DO - 10.1103/PhysRevC.87.014332
M3 - Article
AN - SCOPUS:84873576147
SN - 0556-2813
VL - 87
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 1
M1 - 014332
ER -