[en] The objective of the present work is to study the unresolved "7Li abundance anomaly by carrying out experiments that destroy the rare isotope "7Be, the main source of "7Li. In our upcoming experiment (IS 554) at CERN-HIE-ISOLDE, using a 35 MeV "7Be beam, we plan to measure the (d,p) reaction with the silicon detector array T-REX. The higher beam energy, for the first time, would allow us to measure higher excitation energies in "8Be and a wider angular coverage would help in improved cross-section measurements without assuming isotropy done in earlier works

[en] The incomplete fusion cross section of the ⁶Li + ²⁸Si weakly bound system at above barrier energies was deduced from the measured γ-ray cross sections. The complete fusion cross section was estimated from the measured total fusion and incomplete fusion cross section and is found to be 85-100% of the total fusion cross section. The coupled channel calculation has been performed considering ground and first excited states of ²⁸Si target. The fusion cross section estimated from coupled channel calculation shows good agreement with measured total fusion cross section at higher energies. The suppression of about 15% of the fusion cross section predicted by coupled channel calculation shows good agreement with the complete fusion cross section. The effect of the channel couplings on the elastic scattering angular distribution is also investigated. (orig.)

[en] The light nuclei with two cluster configuration exhibit appreciable probability of breakup in a collision process because of small separation energy of the configuration. The presence of breakup subsequently influences the outcome of the collision of these weakly bound projectiles in a way not observed in case of their strongly bound counter parts. In this context here a systematic continuum discretized coupled channel (CDCC) calculation for our measured elastic angular distribution for the system ⁶Li +²⁸Si has been presented. The primary motivation is to investigate the effect of continuum coupling on the energy variation of the effective interaction potential around the Coulomb barrier energy

[en] The reaction dynamics of loosely bound projectiles with light mass target at near barrier energies is very important and not yet fully understood. So for such light systems with reduced Coulomb strength, the influence of breakup and other direct reactions (e.g. transfer) on fusion and elastic scattering is definitely interesting to probe the interplay of the different processes. The behaviour of the interaction potential for ^6,7Li + ²⁸Si at near barrier energies was found almost energy independent and to be quite different compared to the observations with heavier targets. Recently, a simultaneous description of the elastic, fusion and reaction cross sections has been made by other studies for the same system. The so called breakup threshold anomaly is clearly observed for the ⁶Li+²⁸Si system compared to ⁷Li+²⁸Si. With this motivation, the effect of projectile breakup (BU) on elastic scattering and fusion for ^6,7Li+²⁸Si have been done in the projectile energy range of E/Vb= 0.9 - 3.0 by employing continuum discretized coupled-channels (CDCC) calculation. In this work the reaction cross section, fusion, elastic angular distribution predicted by CDCC are compared with the measured data

[en] The Clover detectors in their add back mode have been seen to be excellent tools for detecting high energy gamma rays (≥ 2 MeV). Recently studies were carried out on the characteristics of a Compton suppressed Clover germanium detector up to 5 MeV using a radioactive ⁶⁶ Ga (T_1/2=9.41 h) source for the first time

[en] Near and sub-barrier fusion excitation by loosely bound projectiles like ^6,7Li and ⁹Be, is an important tool to explore the structure and reaction mechanism through the effect of coupling to the elastic to other transfer/break-up channels. In this perspective we measured cross-sections for ⁷Li induced fusion with ²⁸Si at sub-barrier and near barrier energies where no data exist

[en] In phenomenological model analysis optical potential parameters obtained from fitting of elastic scattering data are essential to understand nuclear-nuclear interaction. Specially the scattering measurements involving weakly bound nuclei, e.g. ^6,7Li, became important due to influence on the fusion process of couplings both to collective degrees of freedom and to breakup/transfer channels. Hence simultaneous analysis of elastic scattering, breakup and fusion is necessary for proper description of the reaction mechanism. There are few attempts in this line with measurements and analysis for heavy target and medium mass target where a consistent set of parameters were used to simultaneously describe scattering and fusion. But there is no such work in the light mass target region. In this perspective elastic angular distributions for ^6,7Li+²⁸Si at certain energies in the interval E_lab= 7 - 26 MeV have been measured and experimentally extracted total fusion cross-sections in the energy range E_lab = 7-26 for ⁷Li+²⁸Si and in E_lab=7-24 MeV for ⁶Li+²⁸Si . The elastic angular distributions were measured at IUAC Pelletron (New Delhi) and at BARC-TIFR Pelletron (Mumbai)

[en] The fusion behaviour induced by loosely bound nuclei like ^6,7Li, ⁹Be with targets of different mass region at different projectile energies exhibits conflicting picture regarding the magnitude of fusion cross section and their dependence on the bombarding energy. We mainly observed the signature of small fusion hindrance at energies beyond twice the barrier, findings which are corroborated by theoretical predictions. In this work we have experimentally measured fusion for ⁶ Li + ²⁸Si at above barrier energies, E_lab = 11-24 MeV, using the characteristic γ-ray method

[en] Recent theoretical studies of near barrier and sub-barrier fusion with loosely bound systems have yielded new insights into the structure and its effects on the fusion reaction dynamics. Fusion excitation functions were measured for ^6,7Li + ²⁸Si, ⁵⁵Mn where no data exit, at several energies in the neighbourhood of the Coulomb barrier. In this paper some results for ⁷Li+²⁸Si are presented

[en] Due to more loose structure of ⁶Li compared to ⁷Li, it is expected that the effects of coupling to the break-up, transfer channels will be more prominent in the former case. As a part of the investigation of scattering, break-up/ transfer and fusion for the systems ^6,7Li + ²⁸Si, the elastic angular distributions have been measured at energies 16, 21 and 26 MeV