Background: Experimental and theoretical studies of nuclear reaction mechanism to understand relative contribution in large alpha production due to breakup, incomplete fusion, and transfer reactions induced by weakly bound projectiles near Coulomb barrier are important. Purpose: Measurement of angular distributions and energy spectra of alpha and deuterons through breakup, transfer, and incomplete fusion processes to disentangle their relative contributions and to investigate relative importance of breakup-fusion compared to transfer. Methods: Inclusive alpha production cross sections have been measured for the Li-6 + V-51 system near Coulomb barrier energies. Theoretical calculations for estimation of various reaction channels contributing to alpha production have been performed with a finite-range coupled reaction method using FRESCO code. The cross sections from noncapture breakup (alpha + d) and 1n, 1p, and 1d transfer channels, compound nuclear decay channels, and incomplete fusion leading to alpha production were estimated to get the cumulative production cross sections. Results: Contributions from breakup, transfer, and incomplete fusion channels could reproduce the integral direct alpha production cross sections and their angular distributions quite well. The direct alpha production cross sections are in agreement with other targets. The alpha production cross sections are higher compared to the deuteron production. Conclusions: Kinematic analysis of the energy spectra of alpha particles and deuterons suggest that a particle spectra is dominated by breakup fusion and deuteron spectra have contribution of breakup and transfer reactions. A systematic study of direct alpha production with various targets follow a universal behavior on average but noticeable differences are observed for different targets. A ratio of alpha and deuteron yields for a wide mass range of targets shows a saturation above barrier and an increasing production of alpha particles relative to deuteron around Coulomb barrier.

Elastic scattering angular distributions have been measured for $$^{7}$$ Li+ $$^{92,100}$$ Mo systems in the bombarding energy range of 0.85 to almost two times the Coulomb barrier. The measured elastic scattering angular distributions are fitted using optical model to investigate energy dependence of the real and imaginary strength parameters with phenomenological Woods-Saxon and double folding S $${\tilde{a}}$$ o Paulo potentials. Both interaction potential models simulate similar patterns to energy dependence sustaining the same consequence of breakup threshold anomaly. The results of Continuum Discretized Coupled Channels (CDCC) Calculations with inclusion of the breakup coupling of the projectile compares experimental elastic scattering angular distribution better for the $$^{7}$$ Li+ $$^{92,100}$$ Mo systems rather than excluding breakup coupling. A systematic behaviour of total reaction cross section on target and projectile dependency has been investigated by including a wide range of target mass and tightly to weakly bound projectiles. A comparative study on obtained breakup and reaction cross sections has also been carried out for $$^{7}$$ Li+ $$^{92,100}$$ Mo systems.

Background: Experimental and theoretical studies of nuclear reaction mechanism to understand relative contribution in large $\ensuremath{\alpha}$ production due to breakup, incomplete fusion, and transfer reactions induced by weakly bound projectiles near Coulomb barrier are important.Purpose: Measurement of angular distributions and energy spectra of $\ensuremath{\alpha}$ and deuterons through breakup, transfer, and incomplete fusion processes to disentangle their relative contributions and to investigate relative importance of breakup-fusion compared to transfer.Methods: Inclusive $\ensuremath{\alpha}$ production cross sections have been measured for the $^{6}\mathrm{Li}+^{51}\mathrm{V}$ system near Coulomb barrier energies. Theoretical calculations for estimation of various reaction channels contributing to $\ensuremath{\alpha}$ production have been performed with a finite-range coupled reaction method using FRESCO code. The cross sections from noncapture breakup ($\ensuremath{\alpha}$ $+$ $d$) and $1n$, $1p$, and $1d$ transfer channels, compound nuclear decay channels, and incomplete fusion leading to $\ensuremath{\alpha}$ production were estimated to get the cumulative production cross sections.Results: Contributions from breakup, transfer, and incomplete fusion channels could reproduce the integral direct $\ensuremath{\alpha}$ production cross sections and their angular distributions quite well. The direct $\ensuremath{\alpha}$ production cross sections are in agreement with other targets. The $\ensuremath{\alpha}$ production cross sections are higher compared to the deuteron production.Conclusions: Kinematic analysis of the energy spectra of $\ensuremath{\alpha}$ particles and deuterons suggest that $\ensuremath{\alpha}$ particle spectra is dominated by breakup fusion and deuteron spectra have contribution of breakup and transfer reactions. A systematic study of direct $\ensuremath{\alpha}$ production with various targets follow a universal behavior on average but noticeable differences are observed for different targets. A ratio of $\ensuremath{\alpha}$ and deuteron yields for a wide mass range of targets shows a saturation above barrier and an increasing production of $\ensuremath{\alpha}$ particles relative to deuteron around Coulomb barrier.

Background: Experimental and theoretical investigation of breakup coupling effects due to different cluster structures ($^{8}\mathrm{Be}+n$ and $^{5}\mathrm{He}+\ensuremath{\alpha}$), relative importance of neutron or $^{5}\mathrm{He}/\ensuremath{\alpha}$ transfer, and their contribution to $\ensuremath{\alpha}$ production are important to understand reaction mechanism in a weakly bound projectile ($^{9}\mathrm{Be}$) near the Coulomb barrier.Purpose: Breakup coupling effect on elastic scattering and measurement of angular distributions and energy spectra of $\ensuremath{\alpha}$ particles produced through breakup, transfer, and complete fusion processes to disentangle their relative contributions and to investigate the relative importance of breakup followed by fusion (breakup-fusion) are compared to transfer.Methods: Elastic scattering, inclusive $\ensuremath{\alpha}$ production, lithium, and boron production cross sections have been measured for the $^{9}\mathrm{Be}+^{51}\mathrm{V}$ system above Coulomb barrier energies. Continuum-discretized-coupled-channels (CDCC) breakup coupling effect using $^{8}\mathrm{Be}+n$ and $^{5}\mathrm{He}+\ensuremath{\alpha}$ cluster configurations have been investigated. Coupled reaction channels (CRC) calculations for $1\mathit{p}, 1\mathit{d}$, and $1\mathit{n}$ stripping and $1\mathit{p}, 1\mathit{d}$ pickup leading to $^{8}\mathrm{Li}+^{52}\mathrm{Cr}, ^{7}\mathrm{Li}+^{53}\mathrm{Cr}, ^{8}\mathrm{Be}+^{52}\mathrm{V}$, and $^{10}\mathrm{B}+^{50}\mathrm{Ti}, ^{11}\mathrm{B}+^{49}\mathrm{Ti}$, respectively, were performed and compared with the experimental data. Theoretical calculations for the estimation of various reaction channels contributing to $\ensuremath{\alpha}$ production have been performed with CDCC and CRC methods using the fresco code.Results: Global optical model parameters for the $^{9}\mathrm{Be}$ projectile describe the elastic scattering data very well and the optical model fit improves the ${\ensuremath{\chi}}^{2}$ slightly. CRC calculations show a major contribution in the production of lithium through $1\mathit{p}, 1\mathit{d}$ stripping and boron through $1\mathit{p}, 1\mathit{d}$ pickup reactions. $\ensuremath{\alpha}$ production angular and energy distributions are obtained, and direct $\ensuremath{\alpha}$ production is described with contributions from noncapture breakup, breakup-fusion, and transfer reactions.Conclusions: Breakup coupling for $^{5}\mathrm{He}+\ensuremath{\alpha}$ and $^{8}\mathrm{Be}+n$ cluster structures shows a repulsive and attractive coupling effect on elastic scattering, respectively. The $^{8}\mathrm{Be}+n$ cluster structure also shows a dipole polarization effect by suppressing the Coulomb rainbow compared to the $^{5}\mathrm{He}+\ensuremath{\alpha}$ cluster structure. Kinematic analysis of the $\ensuremath{\alpha}$ particles energy spectra suggest that $\ensuremath{\alpha}$ production is dominated by breakup-fusion over cluster transfer. CRC calculations suggest that $1\mathit{p}, 1\mathit{d}$ stripping and pickup reactions are a major contributor to lithium and boron production cross sections.

Background: Experimental and theoretical investigation of breakup coupling effects due to different cluster structures (Be-8 +n and He-5 +alpha), relative importance of neutron or 5He/alpha transfer, and their contribution to alpha production are important to understand reaction mechanism in a weakly bound projectile (Be-9) near the Coulomb barrier.Purpose: Breakup coupling effect on elastic scattering and measurement of angular distributions and energy spectra of alpha particles produced through breakup, transfer, and complete fusion processes to disentangle their relative contributions and to investigate the relative importance of breakup followed by fusion (breakup-fusion) are compared to transfer.Methods: Elastic scattering, inclusive alpha production, lithium, and boron production cross sections have been measured for the Be-9 + V-51 system above Coulomb barrier energies. Continuum-discretized-coupled-channels (CDCC) breakup coupling effect using Be-8 +n and He-5 +alpha cluster configurations have been investigated. Coupled reaction channels (CRC) calculations for 1p, 1d, and 1n stripping and 1p, 1d pickup leading to Li-8 +Cr-52, Li-7+Cr-53, Be-8 +V-52, and B-10 +Ti-50, B-11 + Ti-49,respectively, were performed and compared with the experimental data. Theoretical calculations for the estimation of various reaction channels contributing to alpha production have been performed with CDCC and CRC methods using the FRESCO code.Results: Global optical model parameters for the Be-9 projectile describe the elastic scattering data very well and the optical model fit improves the chi(2) slightly. CRC calculations show a major contribution in the production of lithium through 1p, 1d stripping and boron through 1p, 1d pickup reactions. alpha production angular and energy distributions are obtained, and direct alpha production is described with contributions from noncapture breakup, breakup-fusion, and transfer reactions.Conclusions: Breakup coupling for He-5 +alpha and Be-8 +n cluster structures shows a repulsive and attractive coupling effect on elastic scattering, respectively. The Be-8 +n cluster structure also shows a dipole polarization effect by suppressing the Coulomb rainbow compared to the He-5 +alpha cluster structure. Kinematic analysis of the alpha particles energy spectra suggest that alpha production is dominated by breakup-fusion over cluster transfer. CRC calculations suggest that 1p, 1d stripping and pickup reactions are a major contributor to lithium and boron production cross sections.

Inclusive $\alpha$-production cross-section has been measured for $^6$Li+$^{51}$V system near coulomb barrier. Theoretical calculations for contributing reaction channels were performed using finite range coupled reaction method from FRESCO code to understand the reaction mechanisms. Cross-section from breakup($\alpha$+d) and 1-n, 1-p, 1-d and sequential (n+p or p+n) transfer and statistical decay channel leading to $\alpha$-production were estimated to get the cumulative production cross-section. It is observed that these channels could reproduce the integral $\alpha$-production and their angular distributions quite well. The sequential transfer shows a dominant contribution compared to direct transfer channels.