title: Critical-point boundary for the nuclear quantum phase transition near A=100 from mass measurements of (96,97)Kr.
abstract: Mass measurements of (96,97)Kr using the ISOLTRAP Penning-trap spectrometer at CERN-ISOLDE are reported, extending the mass surface beyond N=60 for Z=36. These new results show behavior in sharp contrast to the heavier neighbors where a sudden and intense deformation is present. We interpret this as the establishment of a nuclear quantum phase transition critical-point boundary. The new masses confirm findings from nuclear mean-square charge-radius measurements up to N=60 but are at variance with conclusions from recent gamma-ray spectroscopy.
authors.affiliation: CSNSM-IN2P3-CNRS, Université de Paris Sud, 91405 Orsay, France.
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authors.lastname: Naimi
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authors.lastname: Audi
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authors.lastname: Beck
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authors.lastname: Blaum
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authors.lastname: Böhm
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authors.lastname: Borgmann
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authors.lastname: Breitenfeldt
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authors.lastname: Herfurth
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authors.lastname: Herlert
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authors.lastname: Kowalska
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authors.lastname: Kreim
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authors.lastname: Lunney
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authors.lastname: Neidherr
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authors.lastname: Rosenbusch
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authors.lastname: Schwarz
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authors.lastname: Schweikhard
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authors.lastname: Zuber