Improved Mass Measurements of Nuclei Around N = Z = 34 and The First High Precision Mass Measurement of $^{70m}$Br

ORAL

Abstract

Mass measurements of N = Z nuclei are important for the study of symmetries in nuclear structure, modeling of element synthesis in the rp-process and fundamental interactions tests. Heavy N = Z are located close to or even beyond the proton drip line. The Low Energy Beam and Ion Trap (LEBIT) facility succeeded in making the first high precision mass measurement of $^{70m}$Br, an N = Z proton drip line nuclei. In addition to $^{70m}$Br, the masses of $^{71}$Br, $^{70}$Se and $^{68}$Se were measured by Penning trap mass spectrometry of thermalized rare isotopes produced by fast-beam fragmentation. The results indicate that $^{68}$Se poses a greater waiting point in the rp-process, than previously thought.

*This work was done with the support of Michigan State University, the National Science Foundation Grant PHY-0110253 and the US Department of Energy Contract DE-FG02-00ER41144.

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Authors

  • J. Savory

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • C. Bachelet

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • M. Block

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • G. Bollen

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • M. Facina

    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • C.M. Folden III

    • NSCL
    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • G. Guenaut

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • E. Kwan

    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • A.A. Kwiatkowski

    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • D.J. Morrissey

    • NSCL
    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • G.K. Pang

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • A. Prinke

    • NSCL
    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • R. Ringle

    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • H. Schatz

    • MSU/NSCL
    • National Superconducting Cyclotron Laboratory, Michigan State University
    • NSCL, JINA
    • Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • S. Schwarz

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • P. Schury

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan

  • C.S. Sumithrarachchi

    • National Superconducting Cyclotron Laboratory, Michigan State University, Michigan