Accession Number : AD0601109

Title :   THE WIDTH OF GIANT RESONANCES IN HEAVY NUCLEI,

Corporate Author : MARYLAND UNIV COLLEGE PARK

Personal Author(s) : Danos,Michael ; Greiner,Walter

Report Date : FEB 1964

Pagination or Media Count : 53

Abstract : In heavy nuclei the damping of the giant resonance is due to thermalization of the energy rather than to direct emission of particles; the latter process is strongly inhibited by the angular momentum barrier. The thermalization proceeds via inelastic collisions leading from the particle-hole state to two-particle two-hole states. In heavy nuclei several hundred such states are available at the energy of the giant dipole resonance. The rather large width of the giant resonance arises from the addition of many small partial widths of channels leading to the different two-particle two-hole states. Both the density of the two-particle two-hole states and the mean value of the matrix elements are evaluated in a simplified square well shell model. In a given nucleus the energy dependence of the widths is determined mainly by the density of states; the A-dependence is determined mainly by the size of the matrix elements. (Author)

Descriptors :   (*NUCLEI, NUCLEAR RESONANCE), (*NUCLEAR RESONANCE, NUCLEAR REACTIONS), NUCLEAR ENERGY LEVELS, PHOTONS, INELASTIC SCATTERING, DAMPING, NUCLEAR SHELL MODELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE