Showing papers by "V. V. Parkar published in 2016"
TL;DR: In this paper, the authors used the breakup absorption model to simultaneously describe the measured cross sections of complete fusion (CF), incomplete fusion (ICF), and total fusion (TF) in nuclear reactions induced by weakly bound nuclei.
Abstract: We use the breakup absorption model to simultaneously describe the measured cross sections of complete fusion (CF), incomplete fusion (ICF), and total fusion (TF) in nuclear reactions induced by weakly bound nuclei $^{6,7}\mathrm{Li}$ on $^{209}\mathrm{Bi}$ and $^{198}\mathrm{Pt}$ targets. The absorption cross sections are calculated using the continuum discretized coupled channels (CDCC) method with different choices of short-range imaginary potentials to get the ICF, CF, and TF cross sections. It is observed that the cross sections for deuteron ICF / deuteron capture and $\ensuremath{\alpha}$ ICF / $\ensuremath{\alpha}$ capture are of similar magnitude, in the case of the $^{6}\mathrm{Li}$ projectile, while the cross sections for the triton ICF / triton capture is more dominant than that of $\ensuremath{\alpha}$ ICF / $\ensuremath{\alpha}$ capture in the case of the $^{7}\mathrm{Li}$ projectile. Both these observations are also corroborated by the experimental data. The ratio of ICF to TF cross sections, which defines the value of fusion suppression factor, is found to be in agreement with the data available from the literature. The cross-section ratios of CF/TF and ICF/TF show opposite behavior at below-barrier energies the former decreases while the latter increases as the energy is lowered, which shows the dominance of ICF at below-barrier energies. We have also studied the correlation of the ICF cross sections with the noncapture breakup (NCBU) cross sections as a function of energy, which shows that the NCBU is more significant than ICF at below-barrier energies.
35 citations
TL;DR: In this article, the role of the entrance channel in the occurrence of fusion hindrance is investigated in a model that considers a gradual transition from a sudden to adiabatic regime at low energies.
24 citations
TL;DR: In this paper, the authors explored the two-step process of transfer followed by breakup by measuring a rather complete set of exclusive data for reaction channels populating states in the ejectile continua of the Nb system at energies close to the Coulomb barrier.
Abstract: The two-step process of transfer followed by breakup is explored by measuring a rather complete set of exclusive data for reaction channels populating states in the ejectile continua of the $^{7}\mathrm{Li}+^{93}\mathrm{Nb}$ system at energies close to the Coulomb barrier. The cross sections for $\ensuremath{\alpha}+\ensuremath{\alpha}$ events from one proton pickup were found to be smaller than those for $\ensuremath{\alpha}+d$ events from one neutron stripping and $\ensuremath{\alpha}+t$ events from direct breakup of $^{7}\mathrm{Li}$. Coupled-channels Born approximation and continuum-discretized coupled-channels calculations describe the data well and support the conclusion that the $\ensuremath{\alpha}+d$ and $\ensuremath{\alpha}+\ensuremath{\alpha}$ events are produced by direct transfer to unbound states of the ejectile.
23 citations
TL;DR: In a previous work as discussed by the authors, we presented a taxonomy of tax incentives in the context of economic development in Spain, where we presented the taxonomy for the Spanish taxonomy.
Abstract: Ministerio de Economia y Competitividad (Espana) FPA2010-22131- C02-01 (FINURA) FPA2013-47327-C2-1-R
14 citations
05 Jan 2016
TL;DR: The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions as mentioned in this paper, even far away from the valley of stability, allowing the investigation of isotopes involved in processes as exotic as the r or rp processes.
Abstract: The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-process beta-decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes.
7 citations
TL;DR: This paper aims to demonstrate the efforts towards in-situ applicability of EMMARM, which aims to provide real-time information about concrete mechanical properties such as E-modulus and compressive strength in the response of the immune system.
Abstract: We acknowledge support from CICYT via contract FPA2009-07387, FPA2009-08848, FPA2010-22131-C02-01 and FPA2009- 07653. One of us (M.C.) acknowledges the support of the CSIC-Costa Rica fellowship program.
5 citations
01 Jan 2016
TL;DR: In this paper, the contribution of α from the non-capture α -d breakup of the 6 Li projectile is calculated to be very small, suggesting the possibility of many transfer induced breakup channels, having α as one of the breakup fragments, to be responsible for such a large α particle production.
Abstract: Elastic, inelastic and inclusive alpha cross sections have been measured. Coupled-channels calculations by including the couplings of projectile breakup channels and target excitations explain the measured elastic and inelastic data. The inclusive alpha particle production is found to be more than two-third of the total reaction cross section. From coupled-channels calculations, the contribution of α from the non-capture α -d breakup of the 6 Li projectile is calculated to be very small. It suggests the possibility of many transfer induced breakup channels, having α as one of the breakup fragments, to be responsible for such a large α particle production.
1 citations