• Effective interactions and charges in58Ni

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      https://www.ias.ac.in/article/fulltext/pram/003/02/0061-0073

    • Keywords

       

      58Ni; shell model; effective operators; nuclear spectroscopy; E2 transition rates

    • Abstract

       

      The structure of the low-lying states of58Ni has been calculated in shell model by assuming an inert56Ni core plus two valence nucleons in the p3/2, f5/2 and p1/2 orbitals. The two-body matrix elements are first expressed in terms of seven radial matrix elements and these are then parametrized to give best fit between the computed and the observed energies of the levels below 4 MeV. The wave-functions obtained using these two-body matrix elements are used to study the concept of effective charges. It is found that a single effective charge is not sufficient to predict theB(E2) rates equally well for the thirteen known transitions for which experimental values are available. Assumption of state-dependent effective charges gives a far better agreement. An analysis using wavefunctions obtained with Kuo’s two-body matrix elements also gives a similar result.

    • Author Affiliations

       

      S P Pandya1 B P Singh1 2

      1. Physical Research Laboratory, Ahmedabad - 380009
      2. Indian Institute of Geomagnetism, Colaba, Bombay - 400005
    • Dates

       
  • Pramana – Journal of Physics | News

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