Phys. Rev. Lett. 105, 032502 (2010) [4 pages]Critical-Point Boundary for the Nuclear Quantum Phase Transition Near A=100 from Mass Measurements of 96,97KrReceived 16 March 2010; published 16 July 2010 Mass measurements of 96,97Kr 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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.032502
DOI:
10.1103/PhysRevLett.105.032502
PACS:
21.10.Dr, 64.70.Tg, 74.40.Kb
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