D Bandyopadhyay

Publications (7)2.19 Total impact

• Article: Light-charged-particle evaporation from hot 31P nucleus at E*∼ 60 MeV

  D. Bandyopadhyay, C. Bhattacharya, K. Krishan, S. Bhattacharya, S.K. Basu, A. Chatterjee, S. Kailas, A. Shrivastava, K. Mahata
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  ABSTRACT: The inclusive energy spectra of light charged particles, such as, α, p, d and t, evaporated from the hot 31P nucleus at an excitation energy E *∼ 60 MeV, have been measured at various angles. The compound nucleus 31P has been populated using two different entrance channel configurations; i.e., 7Li (47 MeV) + 24Mg and 19F (96 MeV) + 12C reactions, leading to the same excitation energy of the compound system. It has been observed that the spectra obtained in the 7Li (47 MeV) + 24Mg reaction follow the standard statistical-model prediction with a spherical configuration of the compound nucleus. But, the spectra obtained in the 19F (96 MeV) + 12C 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.
  European Physical Journal A 04/2002; 14(1):53-61. · 2.19 Impact Factor
• Source

  Available from: arxiv.org

  Article: Light charged particle evaporation from hot ${31}^$P nucleus at E$^*$ ~ 60 MeV

  D Bandyopadhyay, C. Bhattacharya, K. Krishan, S Bhattacharya, S. K. Basu, A Chatterjee, S. Kailas, A Srivastava, K. Mahata
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  ABSTRACT: The energy spectra of evaporated light charged particles (LCP) $\alpha$, p, d and t have been measured in $7^$Li(47 MeV) + ${24}^$Mg and ${19}^$F(96 MeV)+ ${12}^$C reactions. Both the systems populate the same compound nucleus ${31}^$F at excitation energy E$^*$ ~ 60 MeV. It has been observed that the light particle spectra obtained in Li + Mg reaction follow standard statistical model prediction, whereas a deformed configuration of the compound nucleus is needed to explain the LCP spectra for F + C reaction, which has been attributed to the effect of larger input angular momentum in the case of ${19}^$F(96 MeV)+ ${12}^$C system.
  09/2001;
• Source

  Available from: arxiv.org

  Article: Exclusive light particle measurements for the system $^{19}$F + $^{12}$C at 96 MeV

  D Bandyopadhyay, C. Bhattacharya, K. Krishan, S Bhattacharya, S. K. Basu, A Chatterjee, S. Kailas, A. Shrivastava, K. Mahata
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  ABSTRACT: Decay sequence of hot ${31}^$P nucleus has been investigated through exclusive light charged particle measurements in coincidence with individual evaporation residues using the reaction ${19}^$F (96 MeV) + ${12}^$C. Information on the sequential decay chain have been extracted by confronting the data with the predictions of the statistical model. It is observed from the present analysis that such exclusive light charged particle data may be used as a powerful tool to probe the decay sequence of the hot light compound systems. Comment: 13 pages, 8 figures, Physical Review C (in press)
  08/2001;
• Source

  Available from: ArXiv

  Article: Evaporation of alpha particles from $^31$P nucleus

  D Bandyopadhyay, S. K. Basu, C. Bhattacharya, S Bhattacharya, K. Krishan, A Chatterjee, S. Kailas, A. Navin, A Srivastava
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  ABSTRACT: The energy spectra of alpha particles have been measured in coincidence with the evaporation residues for the decay of the compound nucleus $^31$P produced in the reaction $^19$F (96 MeV) + $^12$C. The data have been compared with the predictions of the statistical model code CASCADE. It has been observed that significant deformation effect in the compound nucleus need to be considered in order to explain the shape of the evaporated alpha particle energy spectra. Comment: 4 pages, 3 figures, revtex, epsf style
  07/1998;
• Article: Thermostatic properties of finite and infinite nuclear systems

  D. Bandyopadhyay, C. Samanta, S.K. Samaddar, J.N. De
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  ABSTRACT: From a constructed finite-range momentum- and density-dependent effective interaction, we arrive at the equation of state for infinite nuclear matter. This interaction reproduces ground-state properties of finite nuclear systems; in addition it gives a proper energy dependence of the single-particle potential. For symmetric and asymmetric hot nuclear matter, we find the critical and phase-separation temperature, the specific heats, incompressibility and variations of effective mass with temperature and density. For finite nuclei, we also find the limiting temperature, i.e. the maximum temperature that such nuclear systems can sustain.
  Nuclear Physics A.
• Article: Energy dependent potential in nuclear collisions

  D. Bandyopadhyay, S.K. Samaddar
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  ABSTRACT: Energy dependence of the real part of the nucleus-nucleus potential is studied using a modified Seyler-Blanchard two-body effective interaction which contains density dependence along with the momentum dependence. The nucleus-nucleus potential is evaluated in the proximity picture of Blocki et al. The calculated energy dependence of the ion-ion potential compares well with the phenomenology. The various sets of the Skyrme force have also been used to study this energy dependence and widely different results are obtained for the different sets. Heavy-ion fusion excitation functions have also been calculated using the energy-dependent potential in the effective mass approximation. It is observed that the high-energy fusion cross sections are significantly suppressed when calculated with the energy-dependent ion-ion interaction. The important deep-inelastic observables are found to be insensitive to the energy dependence of the potential.
  Nuclear Physics A.
• Article: Energy dependent nucleus-nucleus potential in heavy ion collisions

  D. Bandyopadhyay, S.K. Samaddar, K. Krishan, J.N. De
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  ABSTRACT: The energy dependence of the real part of the nucleus-nucleus potential is evaluated in the proximity picture of Blocki et al. using Seyler-Blanchard two-body effective interaction. This energy dependent potential is used to study the fusion excitation functions and deep inelastic collisions. These results are compared with those calculated with the energy independent proximity potential and it is observed that the energy dependence of the potential does not affect the results significantly except for the reduction of the high energy fusion cross sections.
  Nuclear Physics A.