Evidence for Giant Dipole Resonances Built on the Excited Prolate Band of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Si</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>28</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

M. T. Collins; A. M. Sandorfi; D. H. Hoffmann; M. K. Salomaa

doi:10.1103/PhysRevLett.49.1553

Evidence for Giant Dipole Resonances Built on the Excited Prolate Band of ${}^{28}{Si}$

M. T. Collins, A. M. Sandorfi, D. H. Hoffmann, and M. K. Salomaa

Phys. Rev. Lett. 49, 1553 – Published 22 November 1982

Abstract

Measurements of ${}^{16}O$ + ${}^{12}C$ capture in which high-energy $γ$ rays were detected in coincidence with recoiling ${}^{28}{Si}$ nuclei are reported. The $γ$ -ray spectra are dominated by strong transitions to the excited $K = 0$ prolate band of ${}^{28}{Si}$ . The excitation functions for the decays to the prolate states at 6.7 MeV ( $0^{+}$ ) and 7.4 MeV ( $2^{+}$ ) are consistent with giant dipole resonances. The width of these resonances is narrower than that of the oblate ground state, in surprising contrast to what is expected from energy and deformation considerations.

Received 25 August 1982

DOI:https://doi.org/10.1103/PhysRevLett.49.1553

Authors & Affiliations

M. T. Collins^*, A. M. Sandorfi, and D. H. Hoffmann^†

Physics Department, Brookhaven National Laboratory, Upton, New York 11973

M. K. Salomaa

Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

^*Present address: General Electric Corp., Schenectady, N.Y. 12301.
^†Present address: Gesellschaft für Schwerionenforschung, D-6100 Darmstadt, West Germany.