Author/Authors :
P. Heckman، نويسنده , , D. Bazin، نويسنده , , J.R. Beene، نويسنده , , Y. Blumenfeld، نويسنده , , M.J. Chromik، نويسنده , , M.L. Halbert، نويسنده , , J.F. Liang، نويسنده , , E. Mohrmann، نويسنده , , T. Nakamura، نويسنده , , A. Navin، نويسنده , , B.M Sherrill، نويسنده , , K.A. Snover، نويسنده , , M. Thoennessen، نويسنده , , E. Tryggestad، نويسنده , , R.L. Varner Jr.، نويسنده ,
Abstract :
The width of the giant dipole resonance (GDR) built on excited states was determined from a measurement of γ-decays in coincidence with 17O particles scattered inelastically from 120Sn. The bombarding energy was 80 MeV/u. A width of 4±1 MeV, consistent with the width of the GDR built on the ground state, was found at a temperature T=1 MeV. This result is in disagreement with adiabatic thermal shape fluctuation calculations, indicating an overestimation of the influence of thermal shape fluctuations at low temperature.
