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Open Access Publications from the University of California

γ -ray decay from neutron-bound and unbound states in Mo 95 and a novel technique for spin determination

  • Author(s): Wiedeking, M
  • Krtička, M
  • Bernstein, LA
  • Allmond, JM
  • Basunia, MS
  • Bleuel, DL
  • Burke, JT
  • Daub, BH
  • Fallon, P
  • Firestone, RB
  • Goldblum, BL
  • Hatarik, R
  • Lake, PT
  • Larsen, AC
  • Lee, IY
  • Lesher, SR
  • Paschalis, S
  • Petri, M
  • Phair, L
  • Scielzo, ND
  • Volya, A
  • et al.

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© 2016 American Physical Society. The emission of γ rays from neutron-bound and neutron-unbound states in Mo95, populated in the Mo94(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the Mo95 level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. Spins for almost all Mo95 levels below 2 MeV (and for a few levels above) have been determined with this method.

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