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Status of vibrational structure in 62Ni

A. Chakraborty, J. N. Orce, S. F. Ashley, B. A. Brown, B. P. Crider, E. Elhami, M. T. McEllistrem, S. Mukhopadhyay, E. E. Peters, B. Singh, and S. W. Yates

Phys. Rev. C: Nucl. Phys., vol: 83, num: 3, 11 pages, published: 16 March 2011, 034316

Abstract: Measurements consisting of γ-ray excitation functions and angular distributions were performed using the (n,n′γ) reaction on 62Ni. The excitation function data allowed us to check the consistency of the placement of transitions in the level scheme. From γ-ray angular distributions, the lifetimes of levels up to ~3.8 MeV in excitation energy were extracted with the Doppler-shift attenuation method. The experimentally deduced values of reduced transition probabilities were compared with the predictions of the quadrupole vibrator model and with large-scale shell model calculations in the fp shell configuration space. Two-phonon states were found to exist with some notable deviation from the predictions of the quadrupole vibrator model, but no evidence for the existence of three-phonon states could be established. Z=28 proton core excitations played a major role in understanding the observed structure.


   Atomic nucleus.
      Basic nuclear properties. Properties of particular nuclei.
         Properties of particular nuclei (experiment).
            Z=27÷31.

   Atomic nucleus.
      Radioactive decay.
         Electromagnetic transitions in nuclei (experiment).
            Electromagnetic transition rates in nuclei (40<A≤90).

   Atomic nucleus.
      Nuclear reactions.
         Nuclear reactions induced by neutrons (experiment).
            Neutron-nucleus interactions at 100 keV<E≤ 200 MeV.
               Inelastic neutron scattering (40<A≤90).

   Atomic nucleus.
      Nuclear structure.
         Collective models of atomic nuclei and collective motions in nuclei (other than rotations).
            Low-frequency vibrations in nuclei.

   Atomic nucleus.
      Basic nuclear properties. Properties of particular nuclei.
         Properties of particular nuclei (theory).
            Z=27÷31.

   Atomic nucleus.
      Nuclear structure.
         Microscopic methods in nuclear structure theory (Hartree-Fock method, random phase approximation, etc.).
            Monte--Carlo methods.

   Atomic nucleus.
      Radioactive decay.
         Electromagnetic transitions in nuclei (theory).
            Electromagnetic transition rates in nuclei (A>150).

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