Thu·Aug 28, 2025Thursday·August 28, 2025

1. 01*

   Direct measurement of the 103Rh(n,gamma) and 103Rh(gamma,n) cross section up to stellar temperatures at the CSNS Back-n and SSRF SLEGS

   Hao Liang🇨🇳 · Zhen-dong An · Wei Jiang🇨🇳 · Zi-rui Hao · Chen-chen Guo🇨🇳 · Yu-gang Ma🇨🇳 · Jie Ren🇨🇳 · Xi-chao Ruan🇨🇳 · Jing-yu Tang🇨🇳 · Rui-rui Fan🇨🇳 · Gong-tao Fan🇨🇳 · Hong-wei Wang🇨🇳 and 7 other authors

   The cross sections of 103Rh(n,gamma) and 103Rh(gamma,n) play a crucial role in the stellar nucleosynthesis, rhodium-based self-powered neutron detectors, and nuclear medicine. The cross sections of 103Rh(n,gamma) was measured by the time-of-flight(TOF) method from 1 eV to 1000 keV at the Back-n facility of the Chinese Spallation Neutron Source. In the resolved resonance region, the data reported multiple new resonance structures for the first time. And some discrepancies were observed, offering valuable insights into the differences between the evaluated libraries. Maxwellian-averaged cross sections (MACSs) were calculated within the temperature range of the s process nucleosynthesis model, based on the averaged cross sections in the unresolved resonance region. Meanwhile the cross sections of 103Rh(gamma,n) within the range of p process nucleosynthesis were measured using laser Compton scattering (LCS) gamma rays and a new neutron flat efficiency detector (FED) array at the Shanghai Laser Electron Gamma Source (SLEGS), Shanghai Synchrotron Radiation Facility (SSRF). Using an unfolding iteration method, 103Rh(gamma,n) data were obtained with uncertainty less than 5%, and the inconsistencies between the available experimental data and the evaluated libraries were discussed. This study provides a reliable benchmark for nuclear data evaluation and model optimization, and lays a solid foundation for Rh medical isotope applications and astrophysical research.

   nucl-exPLB(2026)·1 citation
2. 02*

   Measurement of the differential and total cross-sections of $\gamma$-ray emission induced by $14.1$ MeV neutrons for C, Al, Si, Ca, Ti, Cr, and Fe using the tagged neutron method

   P.S. Prusachenko · D.N. Grozdanov · N.A. Fedorov · Yu.N. Kopatch · G.V. Pampushik · P.I. Kharlamov · V.R. Skoy · I.N. Ruskov · T.Yu. Tretyakova · A.V. Andreev · C. Hramco · P.G. Filonchik · TANGRA collaboration

   In this work, differential cross sections of $\gamma$-ray emission produced in nuclear reactions induced by $14.1$~MeV neutrons are measured for the $4.439$~MeV line from carbon, as well as for $10$ individual $\gamma$-ray lines from aluminum, $6$ from silicon, $8$ from calcium, $16$ from titanium, $6$ from chromium, and $14$ from iron. The measurements were conducted using the tagged neutron method with four LaBr${}_3$(Ce) scintillation detectors positioned at angles of $25^{\circ }$, $45^{\circ }$, $60^{\circ }$, and $70^{\circ }$ relative to the generator target -- sample center axis. A neutron generator capable of producing $16$ separate beams of tagged neutrons was employed, which, combined with the detector system, enabled the determination of differential cross-sections for $64$ distinct angle values in the range of $17^{\circ }$ to $89^{\circ }$. To simplify data visualization, the angular distributions were divided into $5^{\circ }$ intervals, with weighted mean values of the angle and differential cross-section calculated for each interval. Corrections for multiple neutron scattering and attenuation, $\gamma$-ray attenuation, and total detection efficiency, computed using GEANT4, were accounted for in the cross-section calculations. Additional measurements were performed to validate the correction calculations. The total $\gamma$-ray emission cross-sections were obtained by approximating the angular distributions with even-order Legendre polynomial expansions up to the $6$th degree, followed by integration over the full solid angle. The total systematic error for the obtained data was estimated as $9$\,\%.

   nucl-exnucl-thCPC(2026)·2 citations
3. 03*

   Heavy Quark Pair Energy Correlators: From Profiling Partonic Splittings to Probing Heavy-Flavor Fragmentation

   João Barata🇨🇭 · Jasmine Brewer🇬🇧 · Kyle Lee🇺🇸 · João M. Silva🇵🇹

   We introduce heavy-flavor energy correlators, $⟨\Psi |{\mathcal{E}}_{\mathcal{H}}({\vec{n}}_1){\mathcal{E}}_{\mathcal{H}}({\vec{n}}_2)|\Psi ⟩$, as a powerful observable for profiling partonic splittings and characterizing heavy-flavor fragmentation. We present its collinear factorization, perform resummation, and demonstrate the angular distribution's sensitivity to both the heavy-quark pair splitting and their subsequent fragmentation. We then apply the heavy-flavor EEC to probe medium-induced effects, revealing its sensitivity to medium modifications to heavy-quark pair splitting functions and to the medium's spatial structure.

   ↳ hep-phhep-exnucl-exnucl-th19 citations
4. 04*

   Charting the Luminosity Capabilities of the CERN Large Hadron Collider with Various Nuclear Species

   E. Waagaard🇨🇭 · R. Bruce🇨🇭 · R. Alemany Fernandez🇨🇭 · H. Bartosik🇨🇭 · J.M. Jowett🇨🇭 · N. Triantafyllou🇨🇭

   The Large Hadron Collider (LHC) at CERN has been instrumental in recent advances in experimental high energy physics by colliding beams of protons and heavier nuclei at unprecedented energies. The present heavy-ion programme is based mainly on colliding lead nuclei. For future ion runs, there is strong interest to achieve a significantly higher integrated nucleon-nucleon luminosity, which might be achieved through collisions of species other than Pb. In this paper, we explore the nucleon-nucleon luminosity projections in the LHC for a selection of ion species ranging from He to Xe, and including Pb as reference. Alternative beam production schemes are investigated as a way to mitigate effects such as space charge that degrade the beam quality in the LHC injectors. In the most optimistic scenarios, we find up to about a factor~4 improvement in integrated nucleon-nucleon luminosity for a typical future one-month run, with respect to the present Pb programme. We also outline a future study programme and experiments to test the assumptions and refine the simulated projections put forward in this article.

   ↳ physics.acc-phnucl-exNucl.Instrum.Meth.A(2026)·5 citations
5. 05*

   A comparison study of collisions at relativistic energies involving light nuclei

   Hai-Cheng Wang🇨🇳 · Song-Jie Li🇨🇳 · Jun Xu🇨🇳 · Zhong-Zhou Ren🇨🇳

   We present extensive comparisons of ${}^{16}$O+${}^{16}$O collisions at the center-of-mass energy per nucleon pair $\sqrt{s_{NN}}=200$ GeV and ${}^{208}$Pb+${}^{16}$O collisions at $\sqrt{s_{NN}}=68.5$ GeV as well as ${}^{20}$Ne+${}^{20}$Ne collisions at $\sqrt{s_{NN}}=200$ GeV and ${}^{208}$Pb+${}^{20}$Ne collisions at $\sqrt{s_{NN}}=68.5$ GeV based on a multiphase transport (AMPT) model. We recommend measuring the ratio of the elliptic flow to the triangular flow, which shows appreciable sensitivity to the structure of light nuclei as also found in other studies. This is especially so if the observable is measured near the target rapidity in ${}^{208}$Pb+${}^{16}$O or ${}^{208}$Pb+${}^{20}$Ne collisions, as originally found in the present study. Our study serves as a useful reference for understanding the structure effect on observables in collisions involving light nuclei under analysis or on the schedule.

   ↳ nucl-thhep-exnucl-exUniverse(2025)·1 citation
6. 06*

   Exclusive vector-toponium photoproduction in hadronic collisions

   Victor P. Goncalves🇧🇷 · Luana Santana🇧🇷 · Bruno D. Moreira🇧🇷

   An exploratory study of the exclusive production of a vector - toponium ${\psi }_t$ state by photon - hadron interactions is performed considering proton - proton and proton - nucleus collisions at the Large Hadron Collider (LHC) and Future Circular Collider (FCC) energies. The scattering amplitude is calculated using the $k_T$ - factorization formalism assuming that the vector - toponium state can be described by a Gaussian light-cone wave function and considering different models for the unintegrated gluon distribution. Predictions for the rapidity distributions and total cross - sections are presented. Our results indicate that the experimental measurement of this final state will be very difficult for the expected integrated luminosities at the LHC and FCC.

   ↳ hep-phhep-exnucl-exnucl-thEPJC(2025)·4 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.