Observation of Giant Dipole Resonances Built on States of High Energy and Spin

J. O. Newton; B. Herskind; R. M. Diamond; E. L. Dines; J. E. Draper; K. H. Lindenberger; C. Schück; S. Shih; F. S. Stephens

doi:10.1103/PhysRevLett.46.1383

Observation of Giant Dipole Resonances Built on States of High Energy and Spin

J. O. Newton, B. Herskind, R. M. Diamond, E. L. Dines, J. E. Draper, K. H. Lindenberger, C. Schück, S. Shih, and F. S. Stephens

Phys. Rev. Lett. 46, 1383 – Published 25 May 1981

Abstract

Spectra of $γ$ rays in the 2-30-MeV range have been observed following ${}^{40}{Ar}$ -induced reactions leading to the ${}^{122}{Te}$ , ${}^{150}{Gd}$ , and ${}^{164}{Er}$ systems. Shoulders in the spectra for $E_{γ} > 10$ MeV are interpreted as arising from the giant dipole resonance and are consistent with statistical-model calculations that use the giant-dipole-resonance strength function. Their observation offers the possibility of studying nuclear shapes and dynamics as functions of temperature and spin.

Received 2 March 1981

DOI:https://doi.org/10.1103/PhysRevLett.46.1383

Authors & Affiliations

J. O. Newton^*, B. Herskind^†, R. M. Diamond, E. L. Dines^‡, J. E. Draper^‡, K. H. Lindenberger^§, C. Schück^∥, S. Shih^¶, and F. S. Stephens

Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

^*Permanent address: Australian National University, Canberra, A.C.T. 2600, Australia.
^†Permanent address: Niels Bohr Institute, University of Copenhagen, Roskilde DK-4000, Denmark.
^‡Permanent address: University of California, Davis, Cal. 95616.
^§Permanent address: Hahn-Meitner Institute Berlin, D-1000 Berlin 38, W. Germany.
^∥Permanent address: Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, F-91406 Orsay, France.
^¶Permanent address: Shanghai Institute of Nuclear Research, Shanghai, China.