Wed·Jun 11, 2025Wednesday·June 11, 2025

1. 01*

   Measurement of radionuclide production probabilities in negative muon nuclear capture and validation of Monte Carlo simulation model

   Y. Yamaguchi🇯🇵 · M. Niikura🇯🇵 · R. Mizuno🇯🇵 · M. Tampo🇯🇵 · M. Harada🇯🇵 · N. Kawamura🇯🇵 · I. Umegaki🇯🇵 · S. Takeshita🇯🇵 · K. Haga🇯🇵

   As part of the development of a sample radioactivity calculation program, we have measured radionuclide production probabilities in negative muon nuclear capture to update experimental data and to validate a calculation dataset obtained by a Monte Carlo simulation code. The probabilities have been obtained by an activation experiment on ${}^{27}$Al, ${}^{\mathrm{nat}}$Si, ${}^{59}$Co, and ${}^{\mathrm{nat}}$Ta targets. The obtained probabilities expand the validation scope to the radionuclide production processes outside of the existing data coverage. By comparing the resultant probabilities with the calculated dataset, it has been revealed that the dataset is generally on the {\color{black}safe} side in radioactivity estimation and needs to be corrected in the following three cases: (i) isomer production; (ii) radionuclide production by the multiple neutron emission; (iii) radionuclide production by particle emissions involving a proton. The present probabilities and the new findings on the correction provide valuable clues to improvements of the simulation models.

   nucl-exNucl.Instrum.Meth.B(2025)·4 citations
2. 02*

   Measurement of $\psi (2S)$ to $J/\psi$ cross-section ratio as function of multiplicity in $p$Pb collisions at$\sqrt{s_{NN}}=8.16$ TeV

   LHCb collaboration: R. Aaij · A.S.W. Abdelmotteleb · C. Abellan Beteta · F. Abudinén · T. Ackernley · A. A. Adefisoye · B. Adeva · M. Adinolfi · P. Adlarson · C. Agapopoulou · C.A. Aidala · Z. Ajaltouni and 1149 other authors

   The production ratio of $\psi (2S)$ to $J/\psi$ charmonium states is presented as a function of multiplicity in proton-lead collisions at a centre-of-mass energy of $\sqrt{s_{NN}}=8.16$ TeV, for both prompt and nonprompt sources. The total luminosity recorded by the LHCb experiment corresponds to 13.6 $p{b}^{-1}$ for $p$Pb collisions and 20.8 $p{b}^{-1}$ for Pb$p$ collisions, where the first particle indicates the forward direction of the detector. Measurements are performed in the dimuon final state at forward (backward) centre-of-mass rapidity $1.5<y^{\ast }<4.0$ ($-5.0<y^{\ast }<-2.5$) for $p$Pb (Pb$p$) collisions.A multiplicity dependence of the prompt production ratio is observed in $p$Pb collisions, whereas no dependence is found in nonprompt production, nor in either prompt or nonprompt production in Pb$p$ collisions. These results suggest that in the Pb-going direction additional suppression mechanisms beyond comover effects may be present, possibly related to the formation of quark-gluon plasma. This highlights a transition from small to large collision systems and provides important insight into the suppression of charmonia in proton-nucleus collisions.

   nucl-exJHEP(2025)·9 citations
3. 03*

   Modern approach to muonic x-ray spectroscopy demonstrated through the measurement of stable Cl radii

   K.A. Beyer🇩🇪 · T.E. Cocolios🇧🇪 · C. Costache🇷🇴 · M. Deseyn🇧🇪 · P. Demol🇧🇪 · A. Doinaki🇨🇭 · O. Eizenberg🇮🇱 · M. Gorshteyn🇩🇪 · M. Heines🇧🇪 · A. Herzáň🇸🇰 · P. Indelicato🇫🇷 · K. Kirch🇨🇭 and 16 other authors

   Recent advances in muonic x-ray experiments have reinvigorated efforts in measurements of absolute nuclear charge radii. Here, a modern approach is presented, and demonstrated through determination of the charge radii of the two stable chlorine nuclides ${}^{35}$Cl and ${}^{37}$Cl. Knowledge of these radii has implications for fundamental studies in nuclear and atomic physics. For this purpose, a state-of-the-art experiment was performed at the $\pi$E1 beamline in the Paul Scherrer Institute (Switzerland), using a large-scale HPGe detector array in order to extract precise energies of the muonic ${}^{35}$Cl and ${}^{37}$Cl $np1s$ transitions. The nuclear charge radius extraction relies on modern calculations for QED effects and nuclear polarization with rigorous uncertainty quantification, including effects that were not accounted for in older studies. Additionally, we established a new method for applying the nuclear shape correction directly from energy density functionals, which are amenable to isotopes for which no high-quality electron scattering experiments are available. The resulting charge radii are $3.3335(23)fm$ for ${}^{35}$Cl and $3.3445(23)fm$ for ${}^{37}$Cl, thus improving the uncertainty of the available electron scattering values by a factor of seven. The correlation of several observables was evaluated between the different isotopes in order to produce a more precise value of the differential mean square charge radius $\delta ⟨r^2{⟩}^{37,35}=+0.0771(66)f{m}^2$. In this case, improvement of the uncertainty by more than one order of magnitude was achieved compared to the literature value. This precision is sufficient to use this differential as input for isotope shift factor determination.

   nucl-exnucl-thphysics.atom-phphysics.data-an7 citations
4. 04*

   Heavy-heavy and heavy-light mesons in cold nuclear matter

   J. J. Cobos-Martínez🇲🇽 · Guilherme N. Zeminiani🇧🇷 · Kazuo Tsushima🇧🇷

   We review the in-medium modifications of effective masses (Lorentz scalar potentials or phenomenon of mass shift) of heavy-heavy and heavy-light mesons in symmetric nuclear matter and their nuclear bound states. We use a combined approach with the quark-meson coupling (QMC) model and an effective Lagrangian. As demonstrated by the cases of pionic and kaonic atoms, studies of meson-nucleus bound state can provide us with important information on chiral symmetry in dense nuclear medium. In this review, we treat the mesons, $K,K^{\ast },D,D^{\ast },B,B^{\ast },\eta ,{\eta }^{\prime },\varphi ,{\eta }_c,J/\psi ,{\eta }_b,{\rm Y}$, and $B_c$, where our emphasys is on the heavy mesons. In addition, we also present some new results for the $B_c$-nucleus bound states.

   ↳ nucl-thhep-exhep-phnucl-exSymmetry(2025)·4 citations
5. 05*

   Energy Correlators: A Journey From Theory to Experiment

   Ian Moult🇺🇸 · Hua Xing Zhu🇨🇳

   Collider experiments offer a unique opportunity to explore the Standard Model (SM), and to search for new physics, new interactions, and new principles of nature. The theoretical abstraction of a collider, namely the study of correlations in asymptotic fluxes, provides one of the most basic examples of an observable in quantum field theory (QFT) and quantum gravity. Energy flux is described in QFT by energy flow operators, a particular example of light-ray operators. In addition to their central role in the theoretical description of collider physics, energy flow operators play an important role in diverse areas of formal QFT and gravity, providing a connection between real world collider phenomenology, and the deep underlying principles of QFT. Recently it has become possible to measure correlation functions of energy flow operators in a wide variety of collider experiments, providing an exciting new connection between collider physics and formal theory. In this review, we provide a survey of recent progress in our understanding of energy operators and their correlators, highlighting their importance in both formal theory and collider phenomenology, and in particular, their great potential for bridging these areas to provide new ways to understand the real world. We intend this article as a resource for both formal theorists interested in understanding how light-ray operators are being applied in particle and nuclear physics, as well as for experimentalists interested in the theoretical motivation for these observables. Most importantly, we aim to stimulate further interaction between the formal, phenomenological and experimental communities through the common lens of energy correlators.

   ↳ hep-phhep-exhep-thnucl-ex+1127 citations
6. 06*

   Aluminium fast neutron leakage spectrum validation

   Martin Schulc🇨🇿 · Tomáš Czakoj · Evžen Novák · Alena Krechlerová · Adam Greš · Jan Šimon · Bohumil Jánský · Jiří Rejchrt · Michal Košťál🇨🇿 · Zdeněk Matěj

   Aluminum is a crucial material in the nuclear industry, valued for its ability to perform reliably over time. The manuscript focuses on validating aluminum neutron transport libraries. The validation was conducted by activating samples in different positions, and measuring the fast neutron spectrum in the energy range of 0.1 MeV to 1.3 MeV by means of a proportional detector filled with hydrogen and, in the energy range of 1-12 MeV using a scintillation stilbene detector. Validation experiments were performed on the aluminium block with a central hole which was assembled from smaller aluminum plates. The dosimetric reactions studied for validation purposes were 58Ni(n,p)58Co, 197Au(n,g)198Au, 63Cu(n,g)64Cu, 181Ta(n,g)182Ta, 92Mo(n,p)92mNb, natTi(n,X)46Sc, and natTi(n,X)47Sc. All experimental data were compared to MCNP6.2 simulations using the ENDF/B-VIII.0, JEFF-3.3, and JENDL-5 neutron transport libraries. Activation cross sections were taken from IRDFF-II library. Concerning activation reactions results, unsatisfactory results are achieved for 197Au(n,g)198Au reaction regardless of thickness and library. All other results are reasonable regardless on library. JEFF-3.3 and ENDF/B-VIII.0 fast neutron flux calculations are similar.

   ↳ physics.app-phnucl-exRadiat.Phys.Chem.(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.