Schottky mass measurement of the Hg208 isotope: Implication for the proton-neutron interaction strength around doubly magic Pb208

L. Chen, Yu A. Litvinov, W. R. Plaß, K. Beckert, P. Beller, F. Bosch, D. Boutin, L. Caceres, R. B. Cakirli, J. J. Carroll, R. F. Casten, R. S. Chakrawarthy, D. M. Cullen, I. J. Cullen, B. Franzke, H. Geissel, J. Gerl, M. Górska, G. A. Jones, A. KishadaR. Knöbel, C. Kozhuharov, S. A. Litvinov, Z. Liu, S. Mandal, F. Montes, G. Münzenberg, F. Nolden, T. Ohtsubo, Z. Patyk, Zs Podolyák, R. Propri, S. Rigby, N. Saito, T. Saito, C. Scheidenberger, M. Shindo, M. Steck, P. Ugorowski, P. M. Walker, S. Williams, H. Weick, M. Winkler, H. J. Wollersheim, T. Yamaguchi

    Research output: Contribution to journalArticlepeer-review

    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. © 2009 The American Physical Society.
    Original languageEnglish
    Article number122503
    JournalPhysical Review Letters
    Volume102
    Issue number12
    DOIs
    Publication statusPublished - 23 Mar 2009

    Keywords

    • PROJECTILE FRAGMENTS
    • NUCLEAR-DEFORMATION
    • EXOTIC NUCLEI
    • SPECTROMETRY
    • ENERGIES
    • STORAGE
    • STATES
    • IONS
    • FRS
    • GSI

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