Mon·Oct 13, 2025Monday·October 13, 2025

1. 01*

   First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of 118Te(p,{\gamma}) for Explosive Nucleosynthesis

   F. Dellmann🇩🇪 · J. Glorius🇩🇪 · Yu. A. Litvinov🇩🇪 · R. Reifarth🇩🇪 · L. Varga🇩🇪 · M. Aliotta🇩🇪 · F. Amjad🇩🇪 · K. Blaum🇩🇪 · L. Bott🇩🇪 · C. Brandau🇩🇪 · B. Brückner🇩🇪 · C. G. Bruno🇬🇧 and 66 other authors

   We present the first nuclear cross-section measurements of (p,{\gamma}) and (p,n) reactions on 118Te at energies relevant for the {\gamma}-process nucleosynthesis. Absolute cross-section values for center-of-mass energies of 6, 7 and 10 MeV are provided, together with a theoretical extrapolation to the Gamow window. This experiment marks the first time that direct proton-induced reactions have been measured on a radioactive ion beam at the Experimental Storage Ring (ESR) at GSI, Darmstadt. This paves the way for a large variety of measurements, delivering new constraints for explosive nucleosynthesis and for physics beyond nuclear stability.

   nucl-exPRL(2025)·8 citations
2. 02*

   Experimental overview: quarkonia as probes for deconfinement

   Michael Winn🇫🇷

   The current status of the experimental investigation of quarkonia in heavy-ion collisions as probes for deconfinement is reviewed. The emphasis is put on the qualitative understanding of charmonia (ccbar bound states) and bottomonia (bbbar) based on the results in the past few years. In particular, the observation of non-primordial J/psi (ccbar) production as signature of deconfinement based on different observables and the sequential suppression patterns of the Upsilon (bbbar) states are discussed. An outlook focusing on the time scale until the next quark matter conference is provided.

   nucl-exhep-exhep-phEPJ Web Conf.(2026)·0 citations
3. 03*

   Burnup Measurement using Bent Crystal Diffraction Spectrometers for Pebble Bed Reactors

   Ian Kolaja · Lee Bernstein · Ludovic Jantzen · Eleanor Tubman · Tatiana Siaraferas · Massimiliano Fratoni

   Burnup measurement is essential for monitoring and controlling pebble bed reactors (PBRs), where fuel pebbles circulate rapidly through the core. However, conventional gamma spectroscopy using high purity germanium (HPGe) detectors is difficult due to high activity levels in discharge pebbles, leading to excessive dead time and Compton scattering. This study explores the use of bent crystal diffraction (BCD) spectrometers to filter the emitted gamma spectrum and isolate key peaks for improved measurement accuracy and speed. Pebble wise depletion calculations were performed and the resulting spectra were analyzed using ray tracing (SHADOW3) and gamma response modeling (GADRAS). Key isotopes, ${}^{137m}$Ba/${}^{137}$Cs, ${}^{239}$Pu, ${}^{144}$Ce, ${}^{148m}$Pm, and ${}^{140}$La, were found to strongly correlate with burnup, residence time, core passes, plutonium production, and fluence. Machine learning regression models applied to simulated spectra achieved a coefficient of determination ($R^2$) as high as 0.995 for burnup prediction. Among various BCD configurations, mosaic silicon crystals in the (440) orientation combined with an HPGe detector provided optimal performance for ${}^{137m}$Ba, while (220) and (440) configurations paired with scintillators were effective for the remaining isotopes.

   ↳ physics.ins-detnucl-ex0 citations
4. 04*

   Exclusive photoproduction of light and heavy vector mesons: thresholds to very high energies

   Lin Tang🇨🇳 · Hui-Yu Xing🇨🇳 · Minghui Ding🇨🇳 · Craig D. Roberts🇨🇳

   A reaction model for $\gamma +p\to V+p$, $V={\rho }^0,\varphi ,J/\psi ,{\rm Y}$, which exposes the quark-antiquark content of the photon in making the transition $\gamma \to q\bar{q}+\mathbb{P}\to V$, where $q$ depends on $V$, and couples the intermediate $q\bar{q}$ system to the proton's valence quarks via Pomeron ($\mathbb{P}$) exchange, is used to deliver a unified description of available data -- both differential and total cross sections -- from near threshold to very high energies, $W$, for all the $V$-mesons. For the ${\rm Y}$, this means $10\lesssim W/\mathrm{GeV}\lesssim 2000$. Also provided are predictions for the power-law exponents that are empirically used to characterise the large-$W$ behaviour of the total cross sections and slope parameters characterising the near-threshold differential cross sections. Appealing to notions of vector meson dominance, the latter have been interpreted as vector-meson--proton scattering lengths. The body of results indicate that it is premature to link any $\gamma +p\to V+p$ data with, for instance, in-proton gluon distributions, the quantum chromodynamics trace anomaly, or pentaquark production. Further developments in reaction theory and higher precision data are required before the validity of any such links can be assessed.

   ↳ hep-phhep-exhep-latnucl-ex+1EPJC(2026)·11 citations
5. 05*

   Probing the Dependence of Partonic Energy Loss on the Initial Energy Density of the Quark Gluon Plasma

   Ian Gill🇺🇸 · Ryan J. Hamilton🇺🇸 · Helen Caines🇺🇸

   Considerable evidence now exists for partonic energy loss due to interaction with the hot, dense medium created in ultra-relativistic heavy-ion collisions. A primary signal of this energy loss is the suppression of high transverse momentum $p_{\mathrm{T}}$ hadron yields in A-A collisions relative to appropriately scaled $pp$ collisions at the same energy. Measuring the collision energy dependence of this energy loss is vital to understanding the medium, but it is difficult to disentangle the medium-driven energy loss from the natural kinematic variance of the steeply-falling $p_{\mathrm{T}}$ spectra across different $\sqrt{s_{\mathrm{NN}}}$. To decouple these effects, we utilize a phenomenologically motivated spectrum shift model to estimate the average transverse momentum loss $\Delta p_{\mathrm{T}}$ imparted on high $p_{\mathrm{T}}$ partons in A-A collisions, a proxy for the medium induced energy loss. We observe a striking correlation between $\Delta p_{\mathrm{T}}$ and Glauber-derived estimates of initial state energy density ${\epsilon }_{\mathrm{Bj}}$, consistent across two orders of magnitude in collision energy for a variety of nuclear species. To access the path-length dependence of energy loss, we couple our model to geometric event shape estimates extracted from Glauber calculations to produce predictions for high-$p_{\mathrm{T}}$ hadron elliptic flow $v_2$ that agree reasonably with data.

   ↳ nucl-thnucl-ex0 citations
6. 06*

   Neutron production with a 10 kW HiCANS based on SATELIT, a CEA-Saclay target with liquid lithium

   L. Thulliez🇫🇷 · N. Berton🇫🇷 · R. Boudouin🇫🇷 · N. Cavalière🇫🇷 · S. Cazaux🇫🇷 · T. Chaminade🇫🇷 · N. Chauvin🇫🇷 · D. Chirpaz🇫🇷 · J.-L. Courouau🇫🇷 · Q. Cridling🇫🇷 · P. Daniel-Thomas🇫🇷 · J. Darpentigny🇫🇷 and 24 other authors

   High-Current Accelerator-driven Neutron Sources (HiCANS) are currently under development across Europe to address the shortage of medium-scale neutron sources, as many research nuclear reactors have been decommissioned over the past several years. At CEA-Saclay, a HiCANS has been developed utilizing the IPHI accelerator, which delivers a 3 MeV proton beam with a current of up to 100 mA, and the CEA-Saclay liquid lithium target named SATELIT. In 2024-2025, a successful experimental campaign was conducted, during which a 10 kW proton beam was directed at the liquid lithium target for nearly 100 h to generate neutrons via the 7Li(p,n)7Be nuclear reaction. Throughout the experimental campaign, a total deposited beam power of 840~kW.h was accumulated, including two continuous operational days exceeding 11 h each. A polyethylene moderator coupled with SATELIT enabled the extraction of a thermal neutron beam, with a flux measured at 1.4 m from the extraction point exceeding $10^6$ n.cm${}^{-2}$.s${}^{-1}$, which is sufficient for numerous neutron applications. The next step for the long-term operation of this facility involves developing strategies to mitigate the radiological concerns associated with the accumulation of 7Be within the system. Overall, this work demonstrates that such facilities can play a significant role in the future of medium-scale neutron sources in Europe.

   ↳ physics.acc-phnucl-exEPJA(2026)·0 citations
7. 07*

   Method to search for the triple-neutron state in an electron scattering experiment

   Tianhao Shao🇨🇳 · Jinhui Chen🇨🇳 · Yu-Gang Ma🇨🇳 · Josef Pochodzalla🇩🇪

   An electron scattering experiment to search for the trineutron state ${}^{3}n$ by reaction ${}^4\mathrm{He}(e,e^{\prime }p{\pi }^{+}{)}^{3}n$ is designed for the A1 facility at Mainzer Microtron. The detailed principles, setup, and simulation of this experiment are presented. With the momenta of the scattered electron, the produced proton and ${\pi }^{+}$ from the reaction measured by three spectrometers with their triple coincidence, the missing mass spectrum of ${}^{3}n$ can be obtained. The production rate of ${}^{3}n$ based on the cross section of the reaction and a MC simulation is estimated to be about 1.5 per day, which can provide a confidence level of the signal greater than 5$\sigma$ with a beam time longer than 16 days. According to a MC simulation that evaluates the energy losses of particles in materials and the performance of three spectrometers, the estimated resolution and the predicted shape of the missing mass spectrum are presented. This work provides a new experimental concept for the search for multineutron states in future experiments with an electron beam.

   ↳ physics.ins-detnucl-exnucl-thEPJA(2025)·0 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.