Jun Su
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Jun Su has a total of 228 co-authors. Here are the top co-authors by number of shared publications:
- Long Zhu
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China, Zhuhai, 519082
20 shared publications Long Zhu
Sino-French Institute of Nuclear Engineering and Technology
17 shared publicationsErxi Xiao
Sino-French Institute of Nuclear Engineering and Technology
13 shared publications- Yingge Huang
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, CHINA
13 shared publications Hui Wang
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, CHINA
9 shared publicationsXin Lei
Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University 519082 Zhuhai China
8 shared publications
Latest Publications
- 4 September 2026
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 137 (10) , 102502
Best Reaction Target to Determine Proton Distribution Radii of Atomic Nuclei
We found that a heavy target such as Pb is most suitable for determining the proton distribution radii of unstable nuclei through charge-changing cross-section (${\ensuremath{\sigma}}_{\mathrm{cc}}$) measurements. Experimentally, low-$Z$ targets are routinely used to determine nucleon distribution radii of unstable isotopes. This approach has recently been extended to study proton distribution radii from ${\ensuremath{\sigma}}_{\mathrm{cc}}$ measurements. However, empirical scaling factors have to be introduced to apply the Glauber models. In the present Letter, we systematically investigated the scaling factor using 39 new ${\ensuremath{\sigma}}_{\mathrm{cc}}$ data of $18\text{ }\text{ }p$-shell nuclei on hydrogen, carbon, silver, and lead targets at around $240\text{ }\mathrm{MeV}/\mathrm{nucleon}$. Together with the existing data, we reveal a universal dependence of the scaling factor on both the masses of target nuclei and the separation energies of projectile nuclei. The scaling factors decrease with increasing target-nucleus mass and converge to 1 for the highest-$Z$ target, making the scaling unnecessary. We conclude that instead of a low-$Z$ target, employing a heavy target such as Pb in ${\ensuremath{\sigma}}_{\mathrm{cc}}$ measurements is the best option to determine the proton distribution radii of unstable nuclei.- 4 September 2026
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 137 (10) , 102502
Best Reaction Target to Determine Proton Distribution Radii of Atomic Nuclei
We found that a heavy target such as Pb is most suitable for determining the proton distribution radii of unstable nuclei through charge-changing cross-section (${\ensuremath{\sigma}}_{\mathrm{cc}}$) measurements. Experimentally, low-$Z$ targets are routinely used to determine nucleon distribution radii of unstable isotopes. This approach has recently been extended to study proton distribution radii from ${\ensuremath{\sigma}}_{\mathrm{cc}}$ measurements. However, empirical scaling factors have to be introduced to apply the Glauber models. In the present Letter, we systematically investigated the scaling factor using 39 new ${\ensuremath{\sigma}}_{\mathrm{cc}}$ data of $18\text{ }\text{ }p$-shell nuclei on hydrogen, carbon, silver, and lead targets at around $240\text{ }\mathrm{MeV}/\mathrm{nucleon}$. Together with the existing data, we reveal a universal dependence of the scaling factor on both the masses of target nuclei and the separation energies of projectile nuclei. The scaling factors decrease with increasing target-nucleus mass and converge to 1 for the highest-$Z$ target, making the scaling unnecessary. We conclude that instead of a low-$Z$ target, employing a heavy target such as Pb in ${\ensuremath{\sigma}}_{\mathrm{cc}}$ measurements is the best option to determine the proton distribution radii of unstable nuclei.- 17 August 2026
- Published by American Physical Society (APS) in Physical Review C
- Vol. 114 (2) , 024329
Dynamical selection of fragment shell effects in spontaneous fission of Pu 240 , Th 232 , and Fm 264
Background: Fragment shell effects are central to the formation of spontaneous-fission (SF) mass yields. However, it remains unclear which configurations favored by fragment shell effects are dynamically selected and ultimately appear as peaks in the SF yields.Purpose: To clarify, by comparing $^{240}\mathrm{Pu}, ^{232}\mathrm{Th}$, and $^{264}\mathrm{Fm}$, how the potential-energy surface (PES) topology and the fission dynamics in the classically allowed region select the scission configurations in which fragment shell stabilization is reflected in the SF yield peaks.Method: A two-step microscopic framework is employed. The PES and collective inertia are obtained from constrained Hartree--Fock--Bogoliubov calculations. The first step, from the inner to the outer turning points, is treated within the Wentzel--Kramers--Brillouin approximation along the least-action path. The second step, from the outer turning points to scission in the classically allowed region, is described by Langevin dynamics. Fragment shell effects are analyzed through fragment PES and smoothed level density indicators evaluated for representative even-even fragment pairs selected from the Langevin scission configurations.Results: The calculated yields display a two-component asymmetric pattern in $^{240}\mathrm{Pu}$, a less distinctly separated asymmetric pattern in $^{232}\mathrm{Th}$, and a symmetric peak in $^{264}\mathrm{Fm}$. The fragment shell analysis shows that the larger yield components coincide with a coherent overlap among dynamically populated scission configurations, favorable fragment PES regions, and regions of low neutron and/or proton level density near the Fermi surface. This overlap is most evident in the dominant asymmetric components of $^{240}\mathrm{Pu}$ and $^{232}\mathrm{Th}$ and in the symmetric component of $^{264}\mathrm{Fm}$, whereas the subdominant components show weaker or more diffuse overlap.Conclusion: SF yields reflect shell-favored fragment configurations that are made accessible by the PES topology and populated by the Langevin dynamics. Enhanced yields then arise in shell-stabilized channels, where shell gaps provide additional binding and favor the fragment configurations energetically. Proton shell effects play a key role in heavy and light fragments, while neutron shell effects provide additional stabilization.- 17 August 2026
- Published by American Physical Society (APS) in Physical Review C
- Vol. 114 (2) , 024329
Dynamical selection of fragment shell effects in spontaneous fission of Pu 240 , Th 232 , and Fm 264
Background: Fragment shell effects are central to the formation of spontaneous-fission (SF) mass yields. However, it remains unclear which configurations favored by fragment shell effects are dynamically selected and ultimately appear as peaks in the SF yields.Purpose: To clarify, by comparing $^{240}\mathrm{Pu}, ^{232}\mathrm{Th}$, and $^{264}\mathrm{Fm}$, how the potential-energy surface (PES) topology and the fission dynamics in the classically allowed region select the scission configurations in which fragment shell stabilization is reflected in the SF yield peaks.Method: A two-step microscopic framework is employed. The PES and collective inertia are obtained from constrained Hartree--Fock--Bogoliubov calculations. The first step, from the inner to the outer turning points, is treated within the Wentzel--Kramers--Brillouin approximation along the least-action path. The second step, from the outer turning points to scission in the classically allowed region, is described by Langevin dynamics. Fragment shell effects are analyzed through fragment PES and smoothed level density indicators evaluated for representative even-even fragment pairs selected from the Langevin scission configurations.Results: The calculated yields display a two-component asymmetric pattern in $^{240}\mathrm{Pu}$, a less distinctly separated asymmetric pattern in $^{232}\mathrm{Th}$, and a symmetric peak in $^{264}\mathrm{Fm}$. The fragment shell analysis shows that the larger yield components coincide with a coherent overlap among dynamically populated scission configurations, favorable fragment PES regions, and regions of low neutron and/or proton level density near the Fermi surface. This overlap is most evident in the dominant asymmetric components of $^{240}\mathrm{Pu}$ and $^{232}\mathrm{Th}$ and in the symmetric component of $^{264}\mathrm{Fm}$, whereas the subdominant components show weaker or more diffuse overlap.Conclusion: SF yields reflect shell-favored fragment configurations that are made accessible by the PES topology and populated by the Langevin dynamics. Enhanced yields then arise in shell-stabilized channels, where shell gaps provide additional binding and favor the fragment configurations energetically. Proton shell effects play a key role in heavy and light fragments, while neutron shell effects provide additional stabilization.- 28 July 2026
- Published by Springer Nature in Nuclear Science and Techniques
- Vol. 37 (10) , 209
From sparse measurements to dense DDX: Bayesian tensor analysis of proton-natPb for ADS source terms
- 28 July 2026
- Published by Springer Nature in Nuclear Science and Techniques
- Vol. 37 (10) , 209
From sparse measurements to dense DDX: Bayesian tensor analysis of proton-natPb for ADS source terms
- Open Access
- 27 July 2026
- Published by Elsevier in Physics Letters B
- Vol. 880
Purifying one-neutron removal as a probe of single-particle strength
- 27 July 2026
- Published by Elsevier in Physics Letters B
- Vol. 880
Open AccessPurifying one-neutron removal as a probe of single-particle strength
- 29 June 2026
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (10) , 104104
Dynamic description and orientation effects in the near-Coulomb barrier ⁶⁴Ni + ²³⁸U reaction
The orientation dependence of the near-Coulomb-barrier reaction ⁶⁴Ni + ²³⁸U at a center-of-mass energy of 301.05 MeV is investigated within the Boltzmann–Uehling–Uhlenbeck transport framework. Three representative orientations of the deformed ²³⁸U target are considered, and an event-by-event window analysis is performed to connect final-state observables with the underlying contact-stage dynamics. The calculated fragment mass distribution, mass–angle distribution, and mass--total-kinetic-energy correlation reproduce the main qualitative features of the available experimental data, including the double-humped mass structure and the weak population near mass symmetry. Within the present event-identification criterion and evolution time, no fusion events are identified. The x orientation gives the largest quasifission component and the strongest mass drift toward symmetry, the z orientation is intermediate, whereas the y orientation is dominated by quasielastic or weakly dissipative events. The analysis of the contact probability P_cont(b), contact time T_cont, and fragment proton number Z, neutron number N, and N/Z ratio indicates that the orientation dependence originates from the combined effects of contact formation, contact lifetime, and nucleon-exchange efficiency through the neck region. These results provide a dynamical interpretation of how the entrance-channel orientation governs the branching between quasielastic and quasifission trajectories.
- 29 June 2026
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (10) , 104104
Dynamic description and orientation effects in the near-Coulomb barrier ⁶⁴Ni + ²³⁸U reaction
The orientation dependence of the near-Coulomb-barrier reaction ⁶⁴Ni + ²³⁸U at a center-of-mass energy of 301.05 MeV is investigated within the Boltzmann–Uehling–Uhlenbeck transport framework. Three representative orientations of the deformed ²³⁸U target are considered, and an event-by-event window analysis is performed to connect final-state observables with the underlying contact-stage dynamics. The calculated fragment mass distribution, mass–angle distribution, and mass--total-kinetic-energy correlation reproduce the main qualitative features of the available experimental data, including the double-humped mass structure and the weak population near mass symmetry. Within the present event-identification criterion and evolution time, no fusion events are identified. The x orientation gives the largest quasifission component and the strongest mass drift toward symmetry, the z orientation is intermediate, whereas the y orientation is dominated by quasielastic or weakly dissipative events. The analysis of the contact probability P_cont(b), contact time T_cont, and fragment proton number Z, neutron number N, and N/Z ratio indicates that the orientation dependence originates from the combined effects of contact formation, contact lifetime, and nucleon-exchange efficiency through the neck region. These results provide a dynamical interpretation of how the entrance-channel orientation governs the branching between quasielastic and quasifission trajectories.
- 12 June 2026
- Published by American Physical Society (APS) in Physical Review C
- Vol. 114 (1)
Shell effects in quasifission toward 180 Hg: Insights into fission asymmetric modes
- 12 June 2026
- Published by American Physical Society (APS) in Physical Review C
- Vol. 114 (1)
Shell effects in quasifission toward 180 Hg: Insights into fission asymmetric modes
- 9 April 2026
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (6) , 061001
Systematic study of odd-even staggering in elemental fragmentation cross sections for N=Z nuclei from 36 Ar to 28 Si at ~ 300 MeV/nucleon
Elemental fragmentation cross sections (EFCS) of the N=Z nuclei 36 Ar, 34 Cl, 32 S, 30 P, and 28 Si on a carbon target have been measured at approximately 300 MeV/nucleon using the RIBLL2 fragment separator at HIRFL. Among these, the cross sections for 34 Cl and 30 P are reported for the first time, providing new data and extending EFCS measurements along the N=Z chain. The obtained cross sections exhibit a significant odd-even staggering effect with respect to the charge change Δ Z . The experimental results are compared with different empirical parametrizations, including Cummings, EPAX3 and FRACS, as well as with the isospin-dependent quantum molecular dynamics model (IQMD) coupled with the statistical decay code GEMINI. The IQMD+GEMINI model reproduced the experimental cross sections with an accuracy of approximately 7%, while also reasonably well reproduced the observed odd-even staggering. In line with previous studies, the comparison between model predictions at different stages demonstrates that the odd-even staggering in EFCSs predominantly originates from the de-excitation process of excited primary fragments. The present results further establish the robustness of this interpretation by extending its validation to the N=Z region.
- 9 April 2026
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (6) , 061001
Systematic study of odd-even staggering in elemental fragmentation cross sections for N=Z nuclei from 36 Ar to 28 Si at ~ 300 MeV/nucleon
Elemental fragmentation cross sections (EFCS) of the N=Z nuclei 36 Ar, 34 Cl, 32 S, 30 P, and 28 Si on a carbon target have been measured at approximately 300 MeV/nucleon using the RIBLL2 fragment separator at HIRFL. Among these, the cross sections for 34 Cl and 30 P are reported for the first time, providing new data and extending EFCS measurements along the N=Z chain. The obtained cross sections exhibit a significant odd-even staggering effect with respect to the charge change Δ Z . The experimental results are compared with different empirical parametrizations, including Cummings, EPAX3 and FRACS, as well as with the isospin-dependent quantum molecular dynamics model (IQMD) coupled with the statistical decay code GEMINI. The IQMD+GEMINI model reproduced the experimental cross sections with an accuracy of approximately 7%, while also reasonably well reproduced the observed odd-even staggering. In line with previous studies, the comparison between model predictions at different stages demonstrates that the odd-even staggering in EFCSs predominantly originates from the de-excitation process of excited primary fragments. The present results further establish the robustness of this interpretation by extending its validation to the N=Z region.
- Open Access
Shell effects in quasifission toward $^{180} \mathrm{Hg}$: insights into fission asymmetric modes
Background: Experiment of $^{180}\mathrm{Hg}$ fission revealed a possible ``new asymmetric fission mode'' in the preactinide region, posing challenges to current fission theory. Similarity on shell effects are observed between fission and quasifission, providing possibility for widely exploring the topography of fission potential-energy surface (PES). Purpose: We aim to investigate the shell effects in the quasifission forming $^{180}\mathrm{Hg}$ and to explore their connection with the $^{180}\mathrm{Hg}$ fission. Method: $^{68}\mathrm{Zn}+^{112}\mathrm{Sn}$, $^{74}\mathrm{Se}+^{106}\mathrm{Pd}$, and $^{80}\mathrm{Kr}+^{100}\mathrm{Ru}$ central collisions at different energies and projectile orientations are calculated using the Skyrme time-dependent Hartree-Fock approach. The static fission properties are calculated with the constrained Hartree-Fock-Bogoliubov method and compared with the quasifission results. Results: Shell effects are found to hinder mass equilibration between the prefragments, enhancing the production of fragments near the $80/100$ mass split. By comparing the quasifission trajectories with the PES in the $(Q_{20}, Q_{30})$ space, the role of PES ridge in forming fragments is identified. The presence of asymmetric valley causes the $ {^{68}\mathrm{Zn}} + {^{112}\mathrm{Sn}} $ quasifission exhibits prefragment mass equilibration process and scission-point configuration similar to those of fission. The elongated light fragment is found to be a key factor in reproducing the experimental fission total kinetic energies. Conclusions: By using quasifission dynamics as a probe of the fission pathway, the present calculations help clarify the specific influence of the PES topography. This highlights the importance of dynamical calculations for preactinide fission, where the manifestation of shell effects is not intuitively evident from the PES.Open AccessShell effects in quasifission toward $^{180} \mathrm{Hg}$: insights into fission asymmetric modes
Background: Experiment of $^{180}\mathrm{Hg}$ fission revealed a possible ``new asymmetric fission mode'' in the preactinide region, posing challenges to current fission theory. Similarity on shell effects are observed between fission and quasifission, providing possibility for widely exploring the topography of fission potential-energy surface (PES). Purpose: We aim to investigate the shell effects in the quasifission forming $^{180}\mathrm{Hg}$ and to explore their connection with the $^{180}\mathrm{Hg}$ fission. Method: $^{68}\mathrm{Zn}+^{112}\mathrm{Sn}$, $^{74}\mathrm{Se}+^{106}\mathrm{Pd}$, and $^{80}\mathrm{Kr}+^{100}\mathrm{Ru}$ central collisions at different energies and projectile orientations are calculated using the Skyrme time-dependent Hartree-Fock approach. The static fission properties are calculated with the constrained Hartree-Fock-Bogoliubov method and compared with the quasifission results. Results: Shell effects are found to hinder mass equilibration between the prefragments, enhancing the production of fragments near the $80/100$ mass split. By comparing the quasifission trajectories with the PES in the $(Q_{20}, Q_{30})$ space, the role of PES ridge in forming fragments is identified. The presence of asymmetric valley causes the $ {^{68}\mathrm{Zn}} + {^{112}\mathrm{Sn}} $ quasifission exhibits prefragment mass equilibration process and scission-point configuration similar to those of fission. The elongated light fragment is found to be a key factor in reproducing the experimental fission total kinetic energies. Conclusions: By using quasifission dynamics as a probe of the fission pathway, the present calculations help clarify the specific influence of the PES topography. This highlights the importance of dynamical calculations for preactinide fission, where the manifestation of shell effects is not intuitively evident from the PES. - 6 October 2025
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (1)
Nuclear temperature of spectator source extracted by neutron spectra in $^{124}$Sn,$^{107}$Sn + $^{120}$Sn collisions at 600 MeV/nucleon
The properties of neutrons from spectator sources produced in $^{107, 124}$Sn + $^{120}$Sn collisions at 600 MeV/nucleon are studied. The isospin-dependent quantum molecular dynamics (IQMD) model is used to describe the dynamical process of the fragmentation, and the statistical model GEMINI is applied to simulate the secondly decay of the pre-fragments. The differential cross section and multiplicity of the neutrons emitted from the spectator source are used to prove the feasibility of the model. The temperatures of the spectator source are extracted by two-source-fitting the transverse momentum distributions of the neutrons using the classical Maxwellian functions. The temperatures of the spectator sources extracted from calculations are consistent with the experimental data, those from the SMM model, and the isotopic temperature \(T_{\text{HeLi}}\). However, the participant source exhibits anomalously high temperatures. Our work suggests the possible model-errors of the IQMD+GEMINI model when describing the neutron emission from the participant source, which is of reference for the further development of the model.- 6 October 2025
- Published by IOP Publishing in Chinese Physics C
- Vol. 50 (1)
Nuclear temperature of spectator source extracted by neutron spectra in $^{124}$Sn,$^{107}$Sn + $^{120}$Sn collisions at 600 MeV/nucleon
The properties of neutrons from spectator sources produced in $^{107, 124}$Sn + $^{120}$Sn collisions at 600 MeV/nucleon are studied. The isospin-dependent quantum molecular dynamics (IQMD) model is used to describe the dynamical process of the fragmentation, and the statistical model GEMINI is applied to simulate the secondly decay of the pre-fragments. The differential cross section and multiplicity of the neutrons emitted from the spectator source are used to prove the feasibility of the model. The temperatures of the spectator source are extracted by two-source-fitting the transverse momentum distributions of the neutrons using the classical Maxwellian functions. The temperatures of the spectator sources extracted from calculations are consistent with the experimental data, those from the SMM model, and the isotopic temperature \(T_{\text{HeLi}}\). However, the participant source exhibits anomalously high temperatures. Our work suggests the possible model-errors of the IQMD+GEMINI model when describing the neutron emission from the participant source, which is of reference for the further development of the model.- 12 September 2025
- Published by American Physical Society (APS) in Physical Review C
- Vol. 112 (3)
Multimodality of and fission studied with the Langevin approach- 12 September 2025
- Published by American Physical Society (APS) in Physical Review C
- Vol. 112 (3)
Multimodality of and fission studied with the Langevin approach