Author/Authors :
F Camera، نويسنده , , A Bracco، نويسنده , , V Nanal، نويسنده , , M.P. Carpenter، نويسنده , , F Della Vedova، نويسنده , , S Leoni، نويسنده , , B Million، نويسنده , , S Mantovani، نويسنده , , C. Rossi-Alvarez and M. Pignanelli، نويسنده , , O Wieland، نويسنده , , B.B Back، نويسنده , , A.M Heinz، نويسنده , , R.V.F. Janssens، نويسنده , , D Jenkins، نويسنده , , T.L. Khoo، نويسنده , , F.G. Kondev، نويسنده , , T Lauritsen، نويسنده , , C.J. Lister، نويسنده , , B McClintock، نويسنده , , S Mitsuoka، نويسنده , , et al.، نويسنده ,
Abstract :
The spectra of high-energy γ rays emitted by the Giant Dipole Resonance (GDR) built on moderately excited states associated with the evaporation of 0, 1 and 2 nucleons were measured in the 90Zr + 89Y symmetric fusion reaction. The radiative fusion data suggest statistical emission from the compound nucleus. In addition, the analysis of the high-energy γ-ray spectra associated with the different evaporation channels at the present temperature of 0.7 MeV and spin range 15–20 ℏ show a fairly narrow width of 5.0±0.35 MeV. This value is smaller than what would be expected in a nucleus where shell effects do not play a role.
