Gamma-ray spectroscopy of the doubly magic nucleus 56Ni

  • E. K. Johansson
  • D. Rudolph
  • J. Ekman
  • C. Fahlander
  • C. Andreoiu
  • M. A. Bentley
  • M. P. Carpenter
  • R. J. Charity
  • R. M. Clark
  • P. Fallon
  • R. V. F. Janssens
  • F. G. Kondev
  • T. L. Khoo
  • T. Lauritsen
  • A. O. Macchiavelli
  • W. Reviol
  • D. G. Sarantites
  • D. Seweryniak
  • C. E. Svensson
  • S. J. Williams
Nuclear Structure and Reactions

Abstract.

The doubly magic N = Z nucleus 56Ni has been investigated with two fusion-evaporation reactions; 40Ca(28Si, 3α)56Ni at a beam energy of 122MeV and 28Si(32S, 2p2n)56Ni at 130MeV. To detect γ-rays in coincidence with evaporated particles the Ge-detector array Gammasphere was used in conjunction with the charged-particle detector system, Microball and a 1π neutron detector array. Results include a significantly extended level scheme of 56Ni, which is compared to large-scale shell model calculations in the fp shell. The experimental and theoretical results agree to a large extent, with one notable exception; the theoretical model fails to predict the proper sequence of the yrast and yrare 8+ states.

PACS.

21.60.Cs Shell model 23.20.En Angular distribution and correlation measurements 23.20.Lv γ transitions and level energies 27.40.+z 39 ⩽ A ⩽ 58 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • E. K. Johansson
    • 1
  • D. Rudolph
    • 1
  • J. Ekman
    • 1
  • C. Fahlander
    • 1
  • C. Andreoiu
    • 1
  • M. A. Bentley
    • 2
  • M. P. Carpenter
    • 3
  • R. J. Charity
    • 4
  • R. M. Clark
    • 5
  • P. Fallon
    • 5
  • R. V. F. Janssens
    • 3
  • F. G. Kondev
    • 3
  • T. L. Khoo
    • 3
  • T. Lauritsen
    • 3
  • A. O. Macchiavelli
    • 5
  • W. Reviol
    • 4
  • D. G. Sarantites
    • 4
  • D. Seweryniak
    • 3
  • C. E. Svensson
    • 5
  • S. J. Williams
    • 2
  1. 1.Department of PhysicsLund UniversityLundSweden
  2. 2.School of Chemistry and PhysicsKeele UniversityKeeleUK
  3. 3.Physics DivisionArgonne National LaboratoryArgonneUSA
  4. 4.Chemistry DepartmentWashington UniversitySt. LouisUSA
  5. 5.Nuclear Science DivisionLawrence Berkeley National LaboratoryBerkeleyUSA

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