Schottky Mass Measurement of the Hg-208 Isotope: Implication for the Proton-Neutron Interaction Strength around Doubly Magic Pb-208

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Publisher's Note: Schottky Mass Measurement of the Hg-208 Isotope: Implication for the Proton-Neutron Interaction Strength around Doubly Magic Pb-208 [Phys. Rev. Lett. 102, 122503 (2009)]　Source: PHYSICAL REVIEW LETTERS Volume: 102 Issue: 13 Article Number: 139904 Published: APR 3 2009Time-resolved Schottky mass spectrometry has been applied to uranium projectile fragments which yielded the mass value for the Hg-208 (Z=80, N=128) isotope. The mass excess value of ME=-13 265(31) keV has been obtained, which has been used to determine the proton-neutron interaction strength in Pb-210, 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.