T. Bhattacharjee

Comparative studies of YAG(Ce) and CsI(Tl) scintillators

Abstract The performances of YAG(Ce) and CsI(Tl) scintillators have been compared using photomultiplier tube (PMT) readout for γ rays and α particles. It is found that the energy resolution of YAG(Ce) is inferior to that of CsI(Tl). With Philips XP2971 PMT, we have obtained improved energy and time resolution for YAG(Ce), compared to the same, obtained by earlier workers using XP2020/Q. The best values of energy resolution (FWHM), obtained in the present work, for 662 keV γ ray, are 6% and 7%, respectively, for CsI(Tl) and YAG(Ce), whereas for 5.48 MeV α particles, the observed values are 6% and 8.4%, respectively. The pulse height response of both the scintillators has been found to be reasonably linear up to 1.3 MeV γ energy. A prompt time resolution of 1.3 ns (FWHM) has been obtained with a BaF 2 – YAG(Ce) combination against 511– 511 keV photopeak selection, which compares well with that obtained for a BaF 2 –CsI(Tl) combination, used by us.

Characterization of fragment emission inNe20(7–10 MeV/nucleon)+C12reactions

The inclusive energy distributions of the complex fragments (3{<=}Z{<=}7) emitted from the bombardment of {sup 12}C by {sup 20}Ne beams with incident energies between 145 and 200 MeV have been measured in the angular range 10 deg.{<=}{theta}{sub lab}{<=}50 deg. Damped fragment yields in all the cases have been found to have the characteristic of emission from fully energy equilibrated composites. The binary fragment yields are compared with the standard statistical model predictions. Whereas Li and Be fragments yields are in agreement with statistical-model calculations, enhanced yields of entrance channel fragments (5{<=}Z{<=}7) indicate the survival of orbiting-like process in {sup 20}Ne+{sup 12}C system at these energies.

Dissipation of angular momentum in light heavy-ion collision

The inclusive energy distributions of fragments

Dissipative collisions in 16 O + 27 Al at E lab = 116 MeV

(4\ensuremath{\leqslant}Z\ensuremath{\leqslant}7)

Band structures and intruderπi13/2state in197Tl

emitted in the reactions

Onset of deformation at N = 112 in Bi nuclei

^{16}\mathrm{O}(116\phantom{\rule{0.3em}{0ex}}\text{MeV})+^{27}\mathrm{Al}

Energy levels in 141Nd from fusion evaporation study

,

Survival of orbiting in Ne 20 (7–10 MeV/nucleon) + C 12 reactions

^{28}\mathrm{Si}

Spectroscopic criteria for identification of nuclear tetrahedral and octahedral symmetries: Illustration on a rare earth nucleus

,

Evidence of antimagnetic rotation in an odd-odd nucleus: The case of 142Eu

^{20}\mathrm{Ne}(145\phantom{\rule{0.3em}{0ex}}\text{MeV})+^{27}\mathrm{Al}