Giant dipole resonance width, nuclear temperature and angular momentum

The evolution of giant dipole resonance (GDR) width in nuclei as a function of temperature and angular momentum is still an interesting and hotly debated field of research. The thermal shape fluctuation model (TSFM) is somewhat successful in explaining the resonance width in a range of temperature and angular momentum. Some discrepancies still exist in quite a few cases. A consistent analysis procedure is adopted in explaining most of the earlier and current data presenting a unified picture within this model. Signature of Jacobi shape transition is observed in 47V and highly deformed prolate like structure is seen for 32S. The experimental results, obtained with the newly fabricated photon spectrometer LAMBDA at VECC, are discussed. (author)