Arshiya Sood1,∗ Arzoo Sharma1,† Akashrup Banerjee2,† Pawan Kumar, Rudra N. Sahoo, Malika Kaushik,... more Arshiya Sood1,∗ Arzoo Sharma1,† Akashrup Banerjee2,† Pawan Kumar, Rudra N. Sahoo, Malika Kaushik, Pushpendra P. Singh, Kavita Rani, Abhishek Yadav, Gurpreet Kaur, Akhil Jhingan, N. Saneesh, Mohit Kumar, Manoj K. Sharma, K. S. Golda, and P. Sugathan Department of Physics, Indian Institute of Technology Ropar, Punjab-140001, India Department of Physics and Astrophysics University of Delhi, Delhi-110007, India Department of Physics, Panjab University, Punjab-160014, India Department of Physics, Jamia Millia Islamia , New Delhi-110025, India Inter-University Accelerator Centre, New Delhi-110067, India and Department of Physics, Shri Varsheny College, Aligarh, Uttar Pradesh-202001, India
Malika Kaushik, G. Gupta, S. Thakur, H. Krishnamoorthy, Pushpendra P. Singh, V.V. Parkar, V. Nana... more Malika Kaushik, G. Gupta, S. Thakur, H. Krishnamoorthy, Pushpendra P. Singh, V.V. Parkar, V. Nanal2,∗ A. Shrivastava, R.G. Pillay, K. Mahata, K. Ramachandran, S. Pal, C.S. Palshetkar, and S.K. Pandit Indian Institute of Technology Ropar, Rupnagar-140001, Punjab INDIA DNAP, Tata Institute of Fundamental Research, Mumbai 400005, INDIA INO, Tata Institute of Fundamental Research, Mumbai 400005, INDIA Homi Bhabha national Institute, Anushaktinagar, Mumbai 400094, INDIA NPD, Bhabha Atomic Research Centre, Mumbai 400085, INDIA and PLF, Tata Institute of Fundamental Research, Mumbai 400005, INDIA
Rudra N. Sahoo1,∗ Malika Kaushik, Arshiya Sood, Pawan Kumar, M. Shuaib, Vijay R. Sharma, Abhishek... more Rudra N. Sahoo1,∗ Malika Kaushik, Arshiya Sood, Pawan Kumar, M. Shuaib, Vijay R. Sharma, Abhishek Yadav, Devendra P. Singh, Unnati Gupta, Pushpendra P. Singh1,† Manoj K. Sharma, Rakesh Kumar, S. Aydin, R. P. Singh, S. Muralithar, H. J. Wollersheim, B. P. Singh, R. K. Bhowmik, P. K. Raina, and R. Prasad Department of Physics, Indian Institute of Technology Ropar, Punjab-140 001, India Department of Physics, A. M. University, Aligarh-202 002, U. P. India 3 Inter-University Accelerator Center, New Delhi-110 067, India Department of Physics, University of Petroleum and Energy Studies, Dehradun-248 007, U. K. India Department of Physics, Delhi University, New Delhi-110 067, India Department of Physics, S. V. College, Aligarh-202 001, U. P. India Department of Physics, University of Aksaray, Aksaray, Turkey and GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
One neutron stripping cross sections (σ−1n) are measured in 9 Be+ 159 Tb system in the energy ran... more One neutron stripping cross sections (σ−1n) are measured in 9 Be+ 159 Tb system in the energy range Ecm/VB ∼ 0.79-1.24 using offline gamma counting technique. The CRC model calculations including the ground state and the 2 + resonance state of 8 Be, carried out using the FRESCO code, give a reasonable description of the measured data. In addition, comparisons of reduced 1n-stripping cross sectionsσ red with 9 Be for different target nuclei (A ∼150-200), and σ red for 9 Be, 6 Li with 159 Tb target are presented. While no strong target dependence is observed with 9 Be projectile, σ red (9 Be) is significantly larger than that for 6 Li, which is consistent with the Q-value for transfer reactions and breakup threshold energy of projectiles.
populated via complete fusion and/or incomplete fusion in F + Ta System Mahesh Kumar1,∗ Manoj K. ... more populated via complete fusion and/or incomplete fusion in F + Ta System Mahesh Kumar1,∗ Manoj K. Sharma1,† Mohd. Shuaib, Ishfaq Majeed, M. Shariq Asnain, Rudra N. Sahoo, Arshiya Sood, Malika Kaushik, Vijay R. Sharma, Abhishek Yadav, Pushpendra P. Singh, Devendra P. Singh, Unnati Gupta, R. Kumar, R. P. Singh, S. Muralithar, B. P. Singh, and R. Prasad Department of Physics, Shri Varshney College, Aligarh 202001, Uttar Pradesh, India Department of Physics, A. M. U., Aligarh 202002, Uttar Pradesh, India Department of Physics, Indian Institute of Technology Ropar, Rupnagar140001, Punjab, India Departamento de Acceleradores, Instituto Nacional Investigaciones Nucleares, Apartado Postal 18-1027, C. P. 11801 ciudad de Maxico, Maxico Department of Physics, Jamia Millia Islamia University, New Delhi, India Department of Physics, University of Petroleum and Energy Studies, Dehradun 248007, Uttarakhand, India Department of Physics, Delhi University, New Delhi 110067, India and Nuclear Physics G...
Nuclear Physics Laboratory, Department of Physics, Aligarh Muslim University, Aligarh-202 002, IN... more Nuclear Physics Laboratory, Department of Physics, Aligarh Muslim University, Aligarh-202 002, INDIA Departamento de Aceleradores, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 181027, C.P. 11801 Ciudad de Mexico, Mexico Department of Physic, Faculty of Natural Sciences Jamia Millia Islami, New Delhi-110025, INDIA Physics Department, S. V. College, Aligarh-202 002, INDIA Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab140 001, INDIA Department of Physics, University of Petroleum and Energy Studies, Dehradun-248 007, INDIA Department of Physic & Astrophysics, University of Delhi, Delhi-110007, INDIA Inter University Accelerator Centre, Aruna Asif Ali Marg, New Delhi-110 067, INDIA, email:*[email protected] , [email protected]
Ishfaq Majeed,* Mohd Shuaib, M. Shariq Asnain, Mahesh Kumar, Vijay R. Sharma, Abhishek Yadav, Man... more Ishfaq Majeed,* Mohd Shuaib, M. Shariq Asnain, Mahesh Kumar, Vijay R. Sharma, Abhishek Yadav, Manoj Kumar Sharma, Pushpendra P. Singh, Devendra P. Singh, Unnati Gupta, Rudra Narayan Sahoo, Arshiya Sood, Malika Kaushik, R. Kumar, R. P. Singh, S. Muralithar, B. P. Singh, † and R. Prasad Nuclear Physics Laboratory, Department of Physics ,Aligarh Muslim University, Aligarh 202002, India 2Department of Physics, Shri Varshney College, Aligarh, Aligarh-202001, India Deptartmento de Acceleradoes, Instituto Nacional de Investigaciones Nucleares Apartado Postal 18-1027, C.P. 11801, Ciudad de Mexico, Mexico NP-Group, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India Department of Physics, Indian Institute of Technology, Ropar, Punjab -140001, India and Department of Physics, University of Petroleum and Energy Studies, Dehradun-248007, India Department of Physics and Astrophysics, Delhi University, Delhi-110007, India . * email: [email protected] † email: b...
Department of Physics, Indian Institute of Technology Ropar Rupnagar, Punjab-140001, India NP-Gro... more Department of Physics, Indian Institute of Technology Ropar Rupnagar, Punjab-140001, India NP-Group, Inter University Accelerator Center, New Delhi-110 067, India Department of Physics, A.M. University, Aligarh, U.P.-202 002, India Department of Physics, S.V. College, Aligarh, U.P.-202 001, India Department of Physics, University of Aksaray, Aksaray, Turkey GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
In order to study incomplete fusion (ICF) reaction dynamics, the present work manifests the role ... more In order to study incomplete fusion (ICF) reaction dynamics, the present work manifests the role of a non-αcluster 14 N projectile on 181 Ta target at energies ≈4-7 MeV/nucleon using the offline γ-ray spectroscopy. The excitation functions for 15 reaction residues populated in 14 N + 181 Ta system have been measured and analyzed within the framework of statistical model code PACE4. The experimentally measured excitation functions of evaporation residues populated via xn/pxn channels are found to be well reproduced by the predictions of code PACE4, which confirms their production solely via complete fusion process. However, an enhancement in the measured excitation function as compared to PACE4 calculations, particularly in tail portion of 192 Hg residue (3n channel) has been observed indicating the presence of precompound emission. A significant contribution from precursor decay in pxn channels has also been observed. An enhancement in the measured excitation functions for α-emitting channels as compared to the PACE4 predictions has been observed and attributed to the incomplete fusion process. Further, the contribution from incomplete fusion process in the 14 N + 181 Ta system has also been deduced in terms of strength function (F ICF). The results have been discussed in terms of the parameters which influence the dynamics of ICF process. The F ICF is found to depend strongly on projectile energies, the product of projectile and target charges, and α-Q value of the projectile.
To probe the role of the intrinsic structure of the projectile on sub-barrier fusion, measurement... more To probe the role of the intrinsic structure of the projectile on sub-barrier fusion, measurement of fusion cross sections has been carried out in 9 Be + 197 Au system in the energy range Ec.m./VB ≈ 0.82 to 1.16 using off-beam gamma counting method. Measured fusion excitation function has been analyzed in the framework of the coupled-channel approach using CCFULL code. It is observed that the coupled-channel calculations, including couplings to the inelastic state of the target and the first two states of the rotational band built on the ground state of the projectile, provide a very good description of the sub-barrier fusion data. At above barrier energies, the fusion cross section is found to be suppressed by ≈ 39(2)% as compared to the coupled-channel prediction. A comparison of reduced excitation function of 9 Be + 197 Au with other x + 197 Au shows a larger enhancement for 9 Be in the sub-barrier region amongst Z=2-5 weakly and tightly bound projectiles, which indicates the prominent role of the projectile deformation in addition to the weak binding.
Background: In heavy-ion induced reactions, the sub-barrier fusion cross sections are found to be... more Background: In heavy-ion induced reactions, the sub-barrier fusion cross sections are found to be higher as compared to the predictions of the one-dimensional barrier penetration model. Attempts have been made to explain sub-barrier fusion enhancement by including the static deformations, the couplings to inelastic excitations, and non-fusion channels. Purpose: To investigate factors which influence the sub-barrier fusion in the 37 Cl + 130 Te system and to understand the interplay of couplings, the fusion excitation function was measured at energies from 10% below to 15% above the Bass barrier. Method: The fusion excitation function was measured by employing a recoil mass spectrometer, the Heavy-Ion Reaction Analyser (HIRA), at the Inter-University Accelerator Centre, New Delhi. To study the behavior of the fusion excitation function and the effect of couplings at sub-barrier energies, the excitation function was analyzed in the framework of the coupled-channels code CCFULL. Results: In the present work, the fusion cross section was measured down to 1 μb at the lowest measured energy, i.e., 10% below the barrier. It was found that the inclusion of couplings of low-lying excited states along with the modified barrier between interacting nuclei satisfactorily reproduces the fusion excitation function of the 37 Cl + 130 Te system. For better insight into the sub-barrier fusion, the fusion barrier distribution, the logarithmic derivative L(E) factor, and the astrophysical S factor were extracted from the analysis of the experimentally measured fusion excitation function. Conclusions: The analysis of the fusion excitation function in terms of the astrophysical S factor and the L(E) factor suggests the absence of fusion hindrance in the 37 Cl + 130 Te system down to a 1 μb cross section achieved at the lowest measured energy. The excitation function of the present system is compared with the existing measurements in which 37 Cl has been used as a projectile to understand the interplay of entrance-channel parameters in sub-barrier fusion enhancement.
In the present work, the onset and strength of incomplete fusion were studied in terms of various... more In the present work, the onset and strength of incomplete fusion were studied in terms of various entrance channel parameters. Excitation functions for individual evaporation residues were measured in the 12 C+ 169 Tm system at energies from 5 to 7.5 A MeV, and analysed in the framework of the statistical model code PACE-IV to deduce the fraction of incomplete fusion. It was found that the probability of incomplete fusion increases with the incident energy as well as with the mass asymmetry of interacting partners for individual projectiles. Moreover, the critical value of the input angular momentum (crit) obtained from the experimental cross sections was compared with that calculated using the Wilczyński formula and a slight difference has been found.
In the present work, channel-by-channel excitation functions of different evaporation residues po... more In the present work, channel-by-channel excitation functions of different evaporation residues populated via complete and/or incomplete fusion in 12 C + 169 Tm system have been measured for an energy range E lab ≈ 53-90 MeV, using recoil-catcher activation technique followed by off-line γ-spectroscopy. Experimentally measured excitation functions have been analysed in the framework of statistical model code PACE. To probe the effect of entrance-channel parameters on the onset and strength of incomplete fusion, relative contributions of complete and incomplete fusion have been deduced from the analysis of experimentally measured excitation functions. The percentage fraction of incomplete fusion deduced from the analysis of excitation functions has been studied in terms of incident energy, entrance-channel mass-asymmetry, ground state alpha-Q-value, neutron skin thickness of target nuclei, and nuclear potential parameters. It has been found that incomplete fusion start competing with complete fusion even at slightly above barrier energies where complete fusion is assumed to the sole contributor. The probability of incomplete fusion increases with incident energy, entrance channel mass-asymmetry, large negative ground state alpha-Q-value, neutron skin thickness, and nuclear potential parameters for individual projectiles.
Arshiya Sood1,∗ Arzoo Sharma1,† Akashrup Banerjee2,† Pawan Kumar, Rudra N. Sahoo, Malika Kaushik,... more Arshiya Sood1,∗ Arzoo Sharma1,† Akashrup Banerjee2,† Pawan Kumar, Rudra N. Sahoo, Malika Kaushik, Pushpendra P. Singh, Kavita Rani, Abhishek Yadav, Gurpreet Kaur, Akhil Jhingan, N. Saneesh, Mohit Kumar, Manoj K. Sharma, K. S. Golda, and P. Sugathan Department of Physics, Indian Institute of Technology Ropar, Punjab-140001, India Department of Physics and Astrophysics University of Delhi, Delhi-110007, India Department of Physics, Panjab University, Punjab-160014, India Department of Physics, Jamia Millia Islamia , New Delhi-110025, India Inter-University Accelerator Centre, New Delhi-110067, India and Department of Physics, Shri Varsheny College, Aligarh, Uttar Pradesh-202001, India
Malika Kaushik, G. Gupta, S. Thakur, H. Krishnamoorthy, Pushpendra P. Singh, V.V. Parkar, V. Nana... more Malika Kaushik, G. Gupta, S. Thakur, H. Krishnamoorthy, Pushpendra P. Singh, V.V. Parkar, V. Nanal2,∗ A. Shrivastava, R.G. Pillay, K. Mahata, K. Ramachandran, S. Pal, C.S. Palshetkar, and S.K. Pandit Indian Institute of Technology Ropar, Rupnagar-140001, Punjab INDIA DNAP, Tata Institute of Fundamental Research, Mumbai 400005, INDIA INO, Tata Institute of Fundamental Research, Mumbai 400005, INDIA Homi Bhabha national Institute, Anushaktinagar, Mumbai 400094, INDIA NPD, Bhabha Atomic Research Centre, Mumbai 400085, INDIA and PLF, Tata Institute of Fundamental Research, Mumbai 400005, INDIA
Rudra N. Sahoo1,∗ Malika Kaushik, Arshiya Sood, Pawan Kumar, M. Shuaib, Vijay R. Sharma, Abhishek... more Rudra N. Sahoo1,∗ Malika Kaushik, Arshiya Sood, Pawan Kumar, M. Shuaib, Vijay R. Sharma, Abhishek Yadav, Devendra P. Singh, Unnati Gupta, Pushpendra P. Singh1,† Manoj K. Sharma, Rakesh Kumar, S. Aydin, R. P. Singh, S. Muralithar, H. J. Wollersheim, B. P. Singh, R. K. Bhowmik, P. K. Raina, and R. Prasad Department of Physics, Indian Institute of Technology Ropar, Punjab-140 001, India Department of Physics, A. M. University, Aligarh-202 002, U. P. India 3 Inter-University Accelerator Center, New Delhi-110 067, India Department of Physics, University of Petroleum and Energy Studies, Dehradun-248 007, U. K. India Department of Physics, Delhi University, New Delhi-110 067, India Department of Physics, S. V. College, Aligarh-202 001, U. P. India Department of Physics, University of Aksaray, Aksaray, Turkey and GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
One neutron stripping cross sections (σ−1n) are measured in 9 Be+ 159 Tb system in the energy ran... more One neutron stripping cross sections (σ−1n) are measured in 9 Be+ 159 Tb system in the energy range Ecm/VB ∼ 0.79-1.24 using offline gamma counting technique. The CRC model calculations including the ground state and the 2 + resonance state of 8 Be, carried out using the FRESCO code, give a reasonable description of the measured data. In addition, comparisons of reduced 1n-stripping cross sectionsσ red with 9 Be for different target nuclei (A ∼150-200), and σ red for 9 Be, 6 Li with 159 Tb target are presented. While no strong target dependence is observed with 9 Be projectile, σ red (9 Be) is significantly larger than that for 6 Li, which is consistent with the Q-value for transfer reactions and breakup threshold energy of projectiles.
populated via complete fusion and/or incomplete fusion in F + Ta System Mahesh Kumar1,∗ Manoj K. ... more populated via complete fusion and/or incomplete fusion in F + Ta System Mahesh Kumar1,∗ Manoj K. Sharma1,† Mohd. Shuaib, Ishfaq Majeed, M. Shariq Asnain, Rudra N. Sahoo, Arshiya Sood, Malika Kaushik, Vijay R. Sharma, Abhishek Yadav, Pushpendra P. Singh, Devendra P. Singh, Unnati Gupta, R. Kumar, R. P. Singh, S. Muralithar, B. P. Singh, and R. Prasad Department of Physics, Shri Varshney College, Aligarh 202001, Uttar Pradesh, India Department of Physics, A. M. U., Aligarh 202002, Uttar Pradesh, India Department of Physics, Indian Institute of Technology Ropar, Rupnagar140001, Punjab, India Departamento de Acceleradores, Instituto Nacional Investigaciones Nucleares, Apartado Postal 18-1027, C. P. 11801 ciudad de Maxico, Maxico Department of Physics, Jamia Millia Islamia University, New Delhi, India Department of Physics, University of Petroleum and Energy Studies, Dehradun 248007, Uttarakhand, India Department of Physics, Delhi University, New Delhi 110067, India and Nuclear Physics G...
Nuclear Physics Laboratory, Department of Physics, Aligarh Muslim University, Aligarh-202 002, IN... more Nuclear Physics Laboratory, Department of Physics, Aligarh Muslim University, Aligarh-202 002, INDIA Departamento de Aceleradores, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 181027, C.P. 11801 Ciudad de Mexico, Mexico Department of Physic, Faculty of Natural Sciences Jamia Millia Islami, New Delhi-110025, INDIA Physics Department, S. V. College, Aligarh-202 002, INDIA Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab140 001, INDIA Department of Physics, University of Petroleum and Energy Studies, Dehradun-248 007, INDIA Department of Physic & Astrophysics, University of Delhi, Delhi-110007, INDIA Inter University Accelerator Centre, Aruna Asif Ali Marg, New Delhi-110 067, INDIA, email:*[email protected] , [email protected]
Ishfaq Majeed,* Mohd Shuaib, M. Shariq Asnain, Mahesh Kumar, Vijay R. Sharma, Abhishek Yadav, Man... more Ishfaq Majeed,* Mohd Shuaib, M. Shariq Asnain, Mahesh Kumar, Vijay R. Sharma, Abhishek Yadav, Manoj Kumar Sharma, Pushpendra P. Singh, Devendra P. Singh, Unnati Gupta, Rudra Narayan Sahoo, Arshiya Sood, Malika Kaushik, R. Kumar, R. P. Singh, S. Muralithar, B. P. Singh, † and R. Prasad Nuclear Physics Laboratory, Department of Physics ,Aligarh Muslim University, Aligarh 202002, India 2Department of Physics, Shri Varshney College, Aligarh, Aligarh-202001, India Deptartmento de Acceleradoes, Instituto Nacional de Investigaciones Nucleares Apartado Postal 18-1027, C.P. 11801, Ciudad de Mexico, Mexico NP-Group, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India Department of Physics, Indian Institute of Technology, Ropar, Punjab -140001, India and Department of Physics, University of Petroleum and Energy Studies, Dehradun-248007, India Department of Physics and Astrophysics, Delhi University, Delhi-110007, India . * email: [email protected] † email: b...
Department of Physics, Indian Institute of Technology Ropar Rupnagar, Punjab-140001, India NP-Gro... more Department of Physics, Indian Institute of Technology Ropar Rupnagar, Punjab-140001, India NP-Group, Inter University Accelerator Center, New Delhi-110 067, India Department of Physics, A.M. University, Aligarh, U.P.-202 002, India Department of Physics, S.V. College, Aligarh, U.P.-202 001, India Department of Physics, University of Aksaray, Aksaray, Turkey GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
In order to study incomplete fusion (ICF) reaction dynamics, the present work manifests the role ... more In order to study incomplete fusion (ICF) reaction dynamics, the present work manifests the role of a non-αcluster 14 N projectile on 181 Ta target at energies ≈4-7 MeV/nucleon using the offline γ-ray spectroscopy. The excitation functions for 15 reaction residues populated in 14 N + 181 Ta system have been measured and analyzed within the framework of statistical model code PACE4. The experimentally measured excitation functions of evaporation residues populated via xn/pxn channels are found to be well reproduced by the predictions of code PACE4, which confirms their production solely via complete fusion process. However, an enhancement in the measured excitation function as compared to PACE4 calculations, particularly in tail portion of 192 Hg residue (3n channel) has been observed indicating the presence of precompound emission. A significant contribution from precursor decay in pxn channels has also been observed. An enhancement in the measured excitation functions for α-emitting channels as compared to the PACE4 predictions has been observed and attributed to the incomplete fusion process. Further, the contribution from incomplete fusion process in the 14 N + 181 Ta system has also been deduced in terms of strength function (F ICF). The results have been discussed in terms of the parameters which influence the dynamics of ICF process. The F ICF is found to depend strongly on projectile energies, the product of projectile and target charges, and α-Q value of the projectile.
To probe the role of the intrinsic structure of the projectile on sub-barrier fusion, measurement... more To probe the role of the intrinsic structure of the projectile on sub-barrier fusion, measurement of fusion cross sections has been carried out in 9 Be + 197 Au system in the energy range Ec.m./VB ≈ 0.82 to 1.16 using off-beam gamma counting method. Measured fusion excitation function has been analyzed in the framework of the coupled-channel approach using CCFULL code. It is observed that the coupled-channel calculations, including couplings to the inelastic state of the target and the first two states of the rotational band built on the ground state of the projectile, provide a very good description of the sub-barrier fusion data. At above barrier energies, the fusion cross section is found to be suppressed by ≈ 39(2)% as compared to the coupled-channel prediction. A comparison of reduced excitation function of 9 Be + 197 Au with other x + 197 Au shows a larger enhancement for 9 Be in the sub-barrier region amongst Z=2-5 weakly and tightly bound projectiles, which indicates the prominent role of the projectile deformation in addition to the weak binding.
Background: In heavy-ion induced reactions, the sub-barrier fusion cross sections are found to be... more Background: In heavy-ion induced reactions, the sub-barrier fusion cross sections are found to be higher as compared to the predictions of the one-dimensional barrier penetration model. Attempts have been made to explain sub-barrier fusion enhancement by including the static deformations, the couplings to inelastic excitations, and non-fusion channels. Purpose: To investigate factors which influence the sub-barrier fusion in the 37 Cl + 130 Te system and to understand the interplay of couplings, the fusion excitation function was measured at energies from 10% below to 15% above the Bass barrier. Method: The fusion excitation function was measured by employing a recoil mass spectrometer, the Heavy-Ion Reaction Analyser (HIRA), at the Inter-University Accelerator Centre, New Delhi. To study the behavior of the fusion excitation function and the effect of couplings at sub-barrier energies, the excitation function was analyzed in the framework of the coupled-channels code CCFULL. Results: In the present work, the fusion cross section was measured down to 1 μb at the lowest measured energy, i.e., 10% below the barrier. It was found that the inclusion of couplings of low-lying excited states along with the modified barrier between interacting nuclei satisfactorily reproduces the fusion excitation function of the 37 Cl + 130 Te system. For better insight into the sub-barrier fusion, the fusion barrier distribution, the logarithmic derivative L(E) factor, and the astrophysical S factor were extracted from the analysis of the experimentally measured fusion excitation function. Conclusions: The analysis of the fusion excitation function in terms of the astrophysical S factor and the L(E) factor suggests the absence of fusion hindrance in the 37 Cl + 130 Te system down to a 1 μb cross section achieved at the lowest measured energy. The excitation function of the present system is compared with the existing measurements in which 37 Cl has been used as a projectile to understand the interplay of entrance-channel parameters in sub-barrier fusion enhancement.
In the present work, the onset and strength of incomplete fusion were studied in terms of various... more In the present work, the onset and strength of incomplete fusion were studied in terms of various entrance channel parameters. Excitation functions for individual evaporation residues were measured in the 12 C+ 169 Tm system at energies from 5 to 7.5 A MeV, and analysed in the framework of the statistical model code PACE-IV to deduce the fraction of incomplete fusion. It was found that the probability of incomplete fusion increases with the incident energy as well as with the mass asymmetry of interacting partners for individual projectiles. Moreover, the critical value of the input angular momentum (crit) obtained from the experimental cross sections was compared with that calculated using the Wilczyński formula and a slight difference has been found.
In the present work, channel-by-channel excitation functions of different evaporation residues po... more In the present work, channel-by-channel excitation functions of different evaporation residues populated via complete and/or incomplete fusion in 12 C + 169 Tm system have been measured for an energy range E lab ≈ 53-90 MeV, using recoil-catcher activation technique followed by off-line γ-spectroscopy. Experimentally measured excitation functions have been analysed in the framework of statistical model code PACE. To probe the effect of entrance-channel parameters on the onset and strength of incomplete fusion, relative contributions of complete and incomplete fusion have been deduced from the analysis of experimentally measured excitation functions. The percentage fraction of incomplete fusion deduced from the analysis of excitation functions has been studied in terms of incident energy, entrance-channel mass-asymmetry, ground state alpha-Q-value, neutron skin thickness of target nuclei, and nuclear potential parameters. It has been found that incomplete fusion start competing with complete fusion even at slightly above barrier energies where complete fusion is assumed to the sole contributor. The probability of incomplete fusion increases with incident energy, entrance channel mass-asymmetry, large negative ground state alpha-Q-value, neutron skin thickness, and nuclear potential parameters for individual projectiles.
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