The statistical gamma-ray decay of the GDR built on excited states in Dy-151-156 has been investigated as a function of angular momentum and temperature. The selection on angular momentum has been made by using the total gamma-ray energy and gamma-ray multiplicity. The temperature dependence in the range T almost-equal-to 1.0 MeV to T almost-equal-to 2.0 MeV has been measured by taking data for two reactions, i.e. Cd-114(40Ar,xn-gamma)Dy-154-x* and Cd-116(40Ar,xn-gamma)Dy-156-x* at beam energies of 180 MeV and 200 MeV, respectively, populating the same final nuclei. A systematic shift of the strength to lower energies has been observed at increasing angular momentum, which can be attributed to a change of the nuclear shape from prolate to oblate.
|Number of pages||6|
|Journal||Institute of physics conference series|
|Publication status||Published - 1990|
- GIANT-DIPOLE RESONANCE
- ROTATING NUCLEI