Low-temperature measurement of the giant dipole resonance width

P Heckman,D Bazin,J R Beene,Y Blumenfeld,M J Chromik,M L Halbert,J F Liang, E C Mohrmann,Takahiro Nakamura,A Navin,B M Sherrill,K A Snover,M Thoennessen,E Tryggestad,R L Varner

Physics Letters B（2003）

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摘要

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.

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关键词

Heavy-ion scattering,Giant dipole resonance in 120Sn,Adiabatic thermal shape fluctuation model

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