R. Pandey

Measurement of giant dipole resonance width at low temperature: A new experimental perspective

Abstract The systematic evolution of the giant dipole resonance (GDR) width in the temperature region of 0.9 – 1.4 MeV has been measured experimentally for 119 Sb using alpha induced fusion reaction and employing the LAMBDA high energy photon spectrometer. The temperatures have been precisely determined by simultaneously extracting the vital level density parameter from the neutron evaporation spectrum and the angular momentum from gamma multiplicity filter using a realistic approach. The systematic trend of the data seems to disagree with the thermal shape fluctuation model (TSFM). The model predicts the gradual increase of GDR width from its ground state value whereas the measured GDR widths appear to remain constant at the ground state value till T ∼ 1 MeV and increase thereafter, indicating towards a failure of the adiabatic assumption of the model at low temperature.

Experimental investigation ofT=1analog states ofAl26andMg26

The even-even nucleus

Band structures and intruderπi13/2state in197Tl

^{26}

Fission fragment mass distributions in reactions populating Pb 200

Mg has been studied through the reaction

Fission fragment mass distributions from Po210 and At213

^{27}

Study of 26Mg through 1p pick-up reaction 27Al(d,3He)

Al(d,

Direct evidence of “washing out” of nuclear shell effects

^{3}

No influence of a

He) at 25 MeV beam energy. The spectroscopic factors have been extracted upto 7.50 MeV excitation energy using local, zero range distorted wave Born approximation. The comparison of the spectroscopic factors have been done with previously reported values using the same reaction probe. The extracted spectroscopic factors for different excited states were found to be in good agreement with the previously reported values for the same. The present results were also compared with the predictions from shell model as well as rotational model. The analog states of

N =

^{26}

126 Neutron Shell Closure in Fission Fragment Mass Distributions

Al and