Critical-Point Boundary for the Nuclear Quantum Phase Transition Near $A=100$ from Mass Measurements of $^{96,97}\mathrm{Kr}$

Critical-Point Boundary for the Nuclear Quantum Phase Transition Near $A = 100$ from Mass Measurements of ${}^{96, 97}{Kr}$

S. Naimi, G. Audi, D. Beck, K. Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, S. George, F. Herfurth, A. Herlert, M. Kowalska, S. Kreim, D. Lunney, D. Neidherr, M. Rosenbusch, S. Schwarz, L. Schweikhard, and K. Zuber

Phys. Rev. Lett. 105, 032502 – Published 16 July 2010

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.

Received 16 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.032502

Authors & Affiliations

S. Naimi¹, G. Audi¹, D. Beck², K. Blaum³, Ch. Böhm³, Ch. Borgmann³, M. Breitenfeldt^4,*, S. George^3,†, F. Herfurth², A. Herlert⁵, M. Kowalska³, S. Kreim³, D. Lunney^1,‡, D. Neidherr⁶, M. Rosenbusch⁴, S. Schwarz⁷, L. Schweikhard⁴, and K. Zuber⁸

¹CSNSM-IN2P3-CNRS, Université de Paris Sud, 91405 Orsay, France
²GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
³Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
⁴Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
⁵CERN, Physics Department, 1211 Geneva 23, Switzerland
⁶Johannes Gutenberg-Universität, Institut für Physik, 55099 Mainz, Germany
⁷NSCL, Michigan State University, East Lansing, Michigan 48824-1321, USA
⁸Institut für Kern- und Teilchenphysik, Technische Universität, 01069 Dresden, Germany

^*Present address: IKS-Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
^†Present address: NSCL, Michigan State University, East Lansing, MI 48824-1321, USA
^‡Corresponding author: david.lunney@csnsm.in2p3.fr

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Vol. 105, Iss. 3 — 16 July 2010

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Physical Review Letters

Critical-Point Boundary for the Nuclear Quantum Phase Transition Near A=100 from Mass Measurements of Kr96,97

S. Naimi, G. Audi, D. Beck, K. Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, S. George, F. Herfurth, A. Herlert, M. Kowalska, S. Kreim, D. Lunney, D. Neidherr, M. Rosenbusch, S. Schwarz, L. Schweikhard, and K. Zuber

Phys. Rev. Lett. 105, 032502 – Published 16 July 2010

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Critical-Point Boundary for the Nuclear Quantum Phase Transition Near $A = 100$ from Mass Measurements of ${}^{96, 97}{Kr}$