Precision Mass Measurements beyond 132Sn: Anomalous behaviour of odd-even staggering of binding energies
Abstract
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. The data reveals a strong N=82 shell gap at Z=50 but indicates the importance of correlations for Z>50. An empirical neutron pairing gap expressed as the odd-even staggering of isotopic masses shows a strong quenching across N=82 for Sn, with the Z-dependence that is unexplainable by the current theoretical models.
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