Elsevier

Nuclear Physics A

Volume 301, Issue 2, 29 May 1978, Pages 213-236
Nuclear Physics A

Investigation of 28Si levels with the (α, γ) and (p, γ) reactions

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Abstract

Particle energies have been measured for resonances in the 27Al(p, γ)28Si and 24Mg(α, γ)28Si reactions with an accuracy of 0.5 × 10−4 and 1 × 10−4, respectively. The Ep = 991.88 ± 0.04 keV27Al(p, γ)28Si resonance served as calibration point. From these data the Q-value of the reaction 27Al(p, α)24Mg has been determined as 1600.14 ± 0.21 keV. Excitation energies of 28Si levels have been measured with the 27Al(p, γ)28Si reaction; the reaction energy is Q = 11584.5 ± 0.4 keV.

Of 33 resonances observed in the 24Mg(α, γ)28Si reaction (Eα = 1.5–3.8 MeV), energies, strengths and γ-ray decay have been measured; five of these resonances had not been reported previously. The γ-ray angular distribution measurements at three resonances yield the resonance Jπ values and the mixing ratios of the strongest transitions involved in the decay. The 10.38 MeV level has Jπ = 3+, T = 1. The arguments on which T-assignments can be based are critically reviewed. These arguments are used to assign T = 1 character to 19 states of 28Si.

References (45)

  • M.J.A. de Voigt et al.

    Nucl. Phys.

    (1971)
  • M.J.A. de Voigt et al.

    Nucl. Phys.

    (1971)
  • A.H. Wapstra et al.

    Nucl. Data

    (1971)
    A.H. Wapstra et al.

    Nucl. Data

    (1971)
  • A. Rytz et al.

    Nucl. Phys.

    (1963)
  • H.H. Staub
  • M.L. Roush et al.

    Nucl. Phys.

    (1970)
  • P.J.M. Smulders et al.

    Physica

    (1962)
  • J.A. Weinman et al.

    Phys. Rev.

    (1964)
  • R.J. Sparks

    Nucl. Phys.

    (1976)
  • C.E. Moss et al.

    Nucl. Phys.

    (1976)
  • R.J. Sparks

    Nucl. Phys.

    (1976)
  • J.F. Ziegler

    Thin Solid Films

    (1973)
  • D.W. Palmer et al.

    Phys. Rev.

    (1963)
  • J.G. McEwen et al.

    Nucl. Instr.

    (1974)
  • P.M. Endt et al.

    Nucl. Phys.

    (1973)
    P.M. Endt et al.

    Nucl. Phys.

    (1967)
  • W.G. Mourad et al.

    Nucl. Phys.

    (1967)
  • M.A. Meyer et al.

    Nucl. Phys.

    (1975)
  • R.L. Heath

    Gamma-ray spectrum catalogue

  • R.G. Helmer et al.

    Nucl. Instr.

    (1971)
    R. G. Helmer, to be...
  • R.P. Sharma et al.

    Nucl. Phys.

    (1973)
  • K. Fifield (Oxford), private...
  • D.O. Boerma et al.

    Nucl. Phys.

    (1976)
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    Present address: IKO, PO Box 4395, Amsterdam.

    ††

    Present address: ATOMKI, H-4001, Debrecen, Pf. 51, Hungary.

    †††

    On sabbatical leave from Physics Department, Cornell College, Mount Vernon (Iowa), USA.

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