2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 14, 53-61 (2002)
DOI: 10.1140/epja/iepja1269

Light-charged-particle evaporation from hot $\chem{^{31}P}$ nucleus at $\mth{E^{*} \sim 60}$ MeV

D. Bandyopadhyay1, C. Bhattacharya1, K. Krishan1, S. Bhattacharya1, S.K. Basu1, A. Chatterjee2, S. Kailas2, A. Shrivastava2 and K. Mahata2

1  Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata - 700 064, India
2  Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India

saila@veccal.ernet.in

(Received: 1 August 2001 Communicated by R.A. Ricci)

Abstract
The inclusive energy spectra of light charged particles, such as, $\alpha$, p, d and t, evaporated from the hot $\chem{^{31}P}$ nucleus at an excitation energy $E^{*} \sim 60$ MeV, have been measured at various angles. The compound nucleus $\chem{^{31}P}$ has been populated using two different entrance channel configurations; i.e., $\chem{^{7}Li}$ (47 MeV) + $\chem{^{24}Mg}$ and $\chem{^{19}F}$ (96 MeV) + $\chem{^{12}C}$ reactions, leading to the same excitation energy of the compound system. It has been observed that the spectra obtained in the $\chem{^{7}Li}$ (47 MeV) + $\chem{^{24}Mg}$ reaction follow the standard statistical-model prediction with a spherical configuration of the compound nucleus. But, the spectra obtained in the $\chem{^{19}F}$ (96 MeV) + $\chem{^{12}C}$ reaction deviate from similar predictions of the statistical model both on higher- as well as on lower-energy sides. Considerable deformation was required to be incorporated in the calculation in order to reproduce the measured-energy spectra in this case. Dynamical trajectory model calculations were not found to play any significant role in explaining the differences in behaviour between the two cases under study. The observed discrepancy has been attributed to the difference in the angular-momentum distributions of the compound nuclei formed in the two reactions.

PACS
24.60.Dr - Statistical compound-nucleus reactions.
25.70.Gh - Compound nucleus.
25.70.Jj - Fusion and fusion-fission reactions.

© Società Italiana di Fisica, Springer-Verlag 2002