title: Precision mass measurements beyond 132Sn: anomalous behavior of odd-even staggering of binding energies.
abstract: Atomic masses of the neutron-rich isotopes (121-128)Cd, (129,131)In, (130-135)Sn, (131-136)Sb, and (132-140)Te have been measured with high precision (10 ppb) using the Penning-trap mass spectrometer JYFLTRAP. Among these, the masses of four r-process nuclei (135)Sn, (136)Sb, and (139,140)Te 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 = 82 for Sn, with a Z dependence that is unexplainable by the current theoretical models.
authors.affiliation: Department of Physics, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Finland. jani.hakala@phys.jyu.fi
authors.forename: J
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authors.lastname: Hakala
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authors.lastname: Dobaczewski
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authors.lastname: Gorelov
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authors.lastname: Eronen
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authors.lastname: Jokinen
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authors.lastname: Kortelainen
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authors.lastname: Moore
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authors.lastname: Penttilä
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authors.lastname: Rissanen
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authors.lastname: Saastamoinen
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authors.lastname: Sonnenschein
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authors.lastname: Äystö