Elsevier

Nuclear Physics A

Volume 524, Issue 2, 11 March 1991, Pages 228-250
Nuclear Physics A

The 24Mg(3He, t)24Al reaction and L=1 giant resonance systematics using an effective 3He-n interaction at 27 MeV/nucleon

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Abstract

Differential cross sections from the 24Mg(3He, t)24Al reaction have been measured from 0 to 32° in the laboratory system. DWBA calculations using an effective projectile-nucleon interaction are compared with the data to verify the applicability of such an approach as well as to deduce spectroscopic information. By employing DWBA in conjunction with transition amplitudes obtained from realistic microscopic wave functions, Jπ assignments could be made. Strength normalizations for all observed transitions to positive-parity T=1 final states of 24Al are given.

Localized ΔL=1 strength around 10 MeV in excitation energy contains most of the expected isovector giant dipole resonance (GDR) and the magnetic quadrupole resonance (MQR) strengths with systematics that are consistent with those for most light, self-conjugate nuclei. A comparison with Coulomb-energy shifted (γ, n) data assists in locating the GDR analog. The isovector 0 strength is not directly observed, but the total expected ΔL=1, ΔS=1 cross section is found in the broad collective “bump” at about 10 MeV and in a number of lower-lying states of negative parity.

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  • Cited by (0)

    This work was performed as part of the program of the “Stichting Fundamenteel Onderzoek der Materie” (FOM) with support from the “Nederlandse Organisatie voor Wetenschappelijk Onderzoek” (NWO).

    1

    Present address: International Christian University, Mitaka-shi, Tokyo, Japan.

    The authors would like to thank H.J. Hofmann and G.W.R. Leibbrandt for their assistance in the data taking and T. Tuintjer for target preparation. We are grateful to P.M. Endt for making the updated tabulation of A = 24 levels available to us before publication. One of us (M.B.G.) wishes to express his gratitude to the staff of the KVI for their kind assistance and continued support and cooperation.

    2

    Present address: PTT, Groningen, The Netherlands.

    3

    Present address: Gasunie, Groningen, The Netherlands.

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