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Schottky Mass Measurement of the Hg208 Isotope: Implication for the Proton-Neutron Interaction Strength around Doubly Magic Pb208

L. Chen et al.
Phys. Rev. Lett. 102, 122503 – Published 27 March 2009; Erratum Phys. Rev. Lett. 102, 139904 (2009)
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Abstract

Time-resolved Schottky mass spectrometry has been applied to uranium projectile fragments which yielded the mass value for the Hg208 (Z=80, N=128) isotope. The mass excess value of ME=13265(31)keV has been obtained, which has been used to determine the proton-neutron interaction strength in Pb210, as a double difference of atomic masses. The results show a dramatic variation of the strength for lead isotopes when crossing the N=126 neutron shell closure, thus confirming the empirical predictions that this interaction strength is sensitive to the overlap of the wave functions of the last valence neutrons and protons.

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  • Received 23 November 2008
  • Corrected 31 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.122503

©2009 American Physical Society

Corrections

31 March 2009

Erratum

Synopsis

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Nucleon attractions

Published 30 March 2009

High-precision mass measurements of an isotope of mercury will help us to understand the forces between nucleons in nuclei.

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Vol. 102, Iss. 12 — 27 March 2009

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