Giant dipole resonance in201Tl at low temperature

Low-temperature measurement of the giant dipole resonance width

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 ther...

The Giant Nuclear Dipole Resonance

above the ground state, where a rough calculation indicates S'6 =80 Mev, a result which is in agreement with the experimentally observed position of the giant resonance. We find the p-ray width of this level to be proportional to A&, and use the width to obtain the cross sections for absorption and scattering of y rays in this region. Throughout we have neglected certain effects of the (r 'r, &...

Sensitivity of the Isoscalar Giant Dipole Resonance to Optical Potentials

EVIDENCE FOR THE ISOSCALAR GIANT DIPOLE RESONANCE IN 208Pb

Population of Isomers in Decay of the Giant Dipole Resonance

The value of an isomeric ratio (IR) in N=81 isotones (137Ba, 139Ce, 141Nd and 143Sm) is studied by means of the (γ, n) reaction. This quantity measures a probability to populate the isomeric state in respect to the ground state population. In (γ, n) reactions, the giant dipole resonance (GDR) is excited and after its decay by a neutron emission, the nucleus has an excitation energy of a few MeV...