Precision mass measurements beyond ^{132}Sn: Anomalous behaviour of odd-even staggering of binding energies

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© 2012 American Physical Society. Published in this repository with the kind permission of the publisher.
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Precision mass measurements beyond ^{132}Sn: Anomalous behaviour of odd-even staggering of binding energies

Atomic masses of the neutron-rich isotopes 121–128Cd, 129;131In, 130–135Sn, 131–136Sb, and 132–140Te have been measured with high precision (10 ppb) using the Penning-trap mass spectrometer JYFLTRAP. Among these, the masses of four r-process nuclei 135Sn, 136Sb, and 139;140Te were measured for the first time. An empirical neutron pairing gap expressed as the odd-even staggering of isotopic masses shows a strong quenching across N ¼ 82 for Sn, with a Z dependence that is unexplainable by the current theoretical models.

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0031-9007