期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.052502
关键词
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Atomic masses of the neutron-rich isotopes (76-80)Zn, (78-83)Ga, (80-85)Ge, (81-87)As, and (84-89)Se have been measured with high precision using the Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. The masses of (82,83)Ga, (83-85)Ge, (84-87)As, and (89)Se were measured for the first time. These new data represent a major improvement in the knowledge of the masses in this neutron-rich region. Two-neutron separation energies provide evidence for the reduction of the N = 50 shell gap energy towards germanium (Z = 32) and a subsequent increase at gallium (Z = 31). The data are compared with a number of theoretical models. An indication of the persistent rigidity of the shell gap towards nickel (Z = 28) is obtained.
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