Wed·Nov 26, 2025Wednesday·November 26, 2025

1. 01*

   Exploration for Astromers near ${}^{132}$Sn with the Canadian Penning Trap

   A.A. Valverde🇺🇸 · S. Cupp🇺🇸 · A. Gross🇺🇸 · B. Liu🇺🇸 · M.R. Mumpower🇺🇸 · G.W. Misch · W.S. Porter🇺🇸 · D. Ray🇨🇦 · M. Brodeur🇺🇸 · D.P. Burdette🇺🇸 · N. Callahan🇺🇸 · A. Cannon and 17 other authors

   Nuclear isomers can have significant impacts on astrophysical nucleosynthesis processes, with recent efforts demonstrating that the population of isomeric states with different half-lives may require separate treatment in reaction networks to accurately capture the differences in heating or in identifiable electromagnetic signals. Several potential so-called ``astromers'' in tin and antimony isotopes near doubly-magic ${}^{132}$Sn were identified and direct mass measurements of their ground and isomeric states were performed with the Canadian Penning Trap at Argonne National Laboratory's CARIBU facility, and their impact on astrophysical reaction rates and in reaction networks calculated. It was found that ${}^{129g,m}$Sn, with measured mass excesses of $-80593.2(25)$ keV and $-80557.4(25)$ keV, respectively, and an excitation energy of $35.8(35)$ keV, behaves as an astromer during neutron capture in the $i$-process and in the $r$-process.

   nucl-exPRC(2026)·0 citations
2. 02*

   Studies of CPT symmetry in positronium decays with 192 plastic strip J-PET detector

   N. Chug🇵🇱 · S. D. Bass🇵🇱 · E. Y. Beyene🇵🇱 · C. Curceanu🇮🇹 · E. Czerwiński🇵🇱 · M. Das🇵🇱 · K. V. Eliyan🇵🇱 · M. Gorgol🇵🇱 · J. Hajduga🇵🇱 · S. Jalali🇵🇱 · B. Jasińska🇵🇱 · K. Kacprzak🇵🇱 and 31 other authors

   A direct test of the CPT symmetry is performed for the electromagnetic decays of ortho-positronium using the J-PET tomograph. We present the precise measurement of the CPT-sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a ${}^{22}$Na source are emitted from the detector's center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 million events with ortho-positronium decays into three photons. The results are consistent with the exactness of CPT symmetry with measured asymmetry amplitude -0.00029 $\pm$ 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.

   nucl-exhep-exPRD(2026)·4 citations
3. 03*

   Exploring the statistical properties of the neutron-deficient ${}^{109}$In isotope with the Oslo method

   M. Markova🇳🇴 · A. C. Larsen🇳🇴 · P. von Neumann-Cosel🇩🇪 · E. Litvinova🇺🇸 · S. Goriely🇧🇪 · L. T. Bell🇳🇴 · T. K. Eriksen🇳🇴 · A. Görgen🇳🇴 · M. Guttormsen🇳🇴 · E. F. Matthews🇺🇸 · A. J. Nordberg🇳🇴 · W. Paulsen🇳🇴 and 5 other authors

   The nuclear level density (NLD) and the $\gamma$-ray strength function (GSF) of the neutron-deficient ${}^{109}$In isotope were extracted for the first time with data from the ${}^{106}$Cd$(\alpha ,p\gamma {)}^{109}$In reaction using a combination of the Oslo and the shape methods. Both quantities are consistent with those of neighboring Cd and Sn nuclei, but show substantial discrepancies with currently available model predictions. In contrast to earlier observations in the neighboring isotopic chains, ${}^{109}$In does not exhibit any significant enhancement of the dipole strength near the neutron separation energy. To interpret this feature, random-phase time-blocking approximation calculations have been performed for ${}^{109}$In and the neighboring ${}^{110,112}$Sn nuclei. The experimental data were also employed to estimate cross sections and rates of the radiative neutron- and proton-capture reactions, ${}^{108}$In($n,\gamma )$${}^{109}$In and ${}^{108}$Cd($p,\gamma )$${}^{109}$In, respectively, with the reaction code TALYS. Our ($p,\gamma )$ cross section is in excellent agreement with direct measurements over a wide range of proton energies, while the ($n,\gamma )$ cross section demonstrates notable deviations from predictions in the JINA REACLIB library. The new results on the statistical properties of ${}^{109}$In provide valuable constraints that may help address the problem of large model uncertainties compromising the accuracy of astrophysical $p$-process simulations.

   nucl-exPRC(2026)·0 citations
4. 04*

   Calibration Plan for the SBC 10-kg Liquid Argon Detector with 100 eV Target Threshold

   E.Alfonso-Pita · D.Baxter · E.Behnke · J.Corbett · M.Crisler · C.E.Dahl · K.Dering · A.de St.Croix · D.Durnford · P.Giampa · J.Hall · O.Harris and 23 other authors

   The Scintillating Bubble Chamber (SBC) Collaboration is designing a new generation of low background, noble liquid bubble chamber experiments with sub-keV nuclear recoil threshold. These experiments combine the electronic recoil blindness of a bubble chamber with the energy resolution of noble liquid scintillation, and maintain electron recoil discrimination at higher degrees of superheat (lower nuclear recoil thresholds) than Freon-based bubble chambers. A 10-kg liquid argon bubble chamber has the potential to set world leading limits on the dark matter nucleon cross-section for $O(\mathrm{GeV}/c^2)$ masses, and to perform a high statistics coherent elastic neutrino nuclear scattering measurement with reactor neutrinos. This work presents a detailed calibration plan to measure the detector response of these experiments, combining photoneutron scattering with two new techniques to induce sub-keV nuclear recoils: nuclear Thomson scattering and thermal neutron capture.

   ↳ physics.ins-dethep-exnucl-exJINST(2026)·0 citations
5. 05*

   First determination of fragmentation functions in an exotic-hadron candidate

   S. Kumano🇨🇳

   In recent years, there are experimental reports on exotic-hadron candidates, which have different quark configurations from ordinary $q\bar{q}$ and $qqq$ constituents. However, it is not easy to confirm their exotic nature from global observables such as masses, spins, parities, and decay widths. At high energies, internal quark and gluon configurations could become more apparent because hadrons should be described by fundamental degrees of freedom of quarks and gluons in quantum chromodynamics. One of such possibilities is to use the fragmentation functions (FFs). In this work, accurate FFs of an exotic hadron candidate $f_0$(980) are determined for the first time by an global analysis of experimental data on $e^{+}+e^{-}\to f_0(980)+X$ with recent precise measurements of the Belle collaboration. From the global analysis, we found that their second moments have a relation $M_u=M_d\ll M_s\sim M_g$ for up-quark, down-quark, strange-quark, and gluon FFs. Furthermore, the function $D_s^{f_0}(z)$ is distributed in the larger-$z$ region in comparison with the functions $D_u^{f_0}(z)$, $D_d^{f_0}(z)$, and $D_g^{f_0}(z)$. These facts support that the $f_0(980)$ has the $s\bar{s}$ configuration at high energies. This is a new finding that $f_0(980)$ should be considered mainly as the $s\bar{s}$ state, which is different from our usual understanding as a tetraquark (or $K\bar{K}$) hadron from low-energy studies. Our results could indicate the transition of the internal configuration picture that $f_0(980)$ looks like a $q\bar{q}$ state at high energies although it is described by tetra-quark or $K\bar{K}$ molecule state at low energies. It sheds light on a new direction in exotic hadron physics.

   ↳ hep-phhep-exhep-latnucl-ex+10 citations
6. 06*

   Toward a Unified Understanding of the Dense Matter Equation of State

   Kshitij Agarwal🇮🇹 · Johannes Jahan🇺🇸 · Behruz Kardan🇩🇪 · Peter T. H. Pang🇳🇱 · Tom Reichert🇺🇸 · Alexandra C. Semposki🇺🇸

   Efforts to understand the equation of state (EOS) of dense nuclear matter at supra-saturation densities have grown more sophisticated over the past decade, driven by a surge in high-precision data from both terrestrial experiments and astrophysical observations. While for the former, heavy-ion collisions (HIC) represent a unique opportunity to constrain the EOS in a controlled laboratory setting, the latter can be precisely probed thanks to the advent of multi-messenger astronomy (MMA). However, as we move away from understanding drawn from individual sources and limited statistics to the era of precision physics with improved datasets, the need for a systematic way to combine them becomes clear. In this article, we trace the individual methods for extracting the EOS both for HIC and MMA. We then review the current state-of-the-art collaborative efforts to combine these individual sources of information, focusing on: the Nuclear Physics and Multi-Messenger Astrophysics (NMMA) framework, which relies on Bayesian inference methods; the Modular Unified Solver for the Equation of State (MUSES) calculation engine, which integrates EOS priors with HIC data and produces predictions for key neutron star properties; and the Bayesian Analysis of Nuclear Dynamics (BAND) framework, which uses cutting-edge Bayesian methods to produce reliable and trustworthy predictions for nuclear and astrophysical problems. We highlight the scientific advances with respect to the EOS and neutron star properties made possible by each framework and outline the remaining challenges that must be addressed to build a coherent, predictive picture of dense nuclear matter across all relevant regimes. We conclude with a detailed discussion of how these frameworks might be integrated with each other to form a unified workflow for future EOS predictions.

   ↳ nucl-thastro-ph.HEastro-ph.SRgr-qc+17 citations
7. 07*

   Anisotropic flows in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=2.4\text{GeV}$ with a Skyrme pseudopotential

   Xin Li🇨🇳 · Si-Pei Wang🇨🇳 · Rui Wang🇮🇹 · Zhen Zhang🇨🇳 · Jie Pu🇨🇳 · Chun-Wang Ma🇨🇳 · Lie-Wen Chen🇨🇳

   Within the framework of the lattice Boltzmann-Uehling-Uhlenbeck transport model, we present a systematic study of proton anisotropic flow observables measured by the HADES collaboration, by utilizing the recently developed density-, momentum- and isospin-dependent N$5$LO Skyrme pseudopotential. In particular, we investigate the impacts of the momentum dependence of nucleon mean-field potentials, the stiffness of symmetric nuclear matter (SNM) EOS, the high-density behaviors of the symmetry energy and the in-medium modification of nucleon-nucleon elastic cross sections on proton $v_1$, $v_2$, $v_3$, and $v_4$ in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=2.4\text{GeV}$. Our results show that the proton anisotropic flows are strongly sensitive to the momentum dependence of nucleon mean-field potential as well as the incompressibility coefficient $K_0$ of SNM. In addition, the transverse momentum dependence of the proton $v_2$ exhibits a modest sensitivity to the higher-order skewness coefficient $J_0$ and kurtosis coefficient $I_0$ of SNM as well as the momentum dependence of the symmetry potential, while the transverse momentum dependence of the proton $v_1$ is shown to modestly depend on the in-medium modification of nucleon-nucleon elastic cross sections. Moreover, the high-density symmetry energy seems to have limited effects on the proton anisotropic flows. These findings highlight the necessity of considering the momentum dependence of nucleon mean-field potentials including the symmetry potential, the higher-order characteristic parameters of SNM EOS beyond $K_0$, and the in-medium modification of nucleon-nucleon elastic cross sections, in future Bayesian transport model analyses on proton anisotropic flows in heavy-ion collisions at HADES energies, thereby to extract information on nuclear matter EOS as well as the associated underlying nuclear effective interactions.

   ↳ nucl-thastro-ph.HEhep-phnucl-exPRC(2026)·1 citation
8. 08*

   New framework for extracting GPDs from exclusive photon electroproduction

   Jian-Wei Qiu🇺🇸 · Nobuo Sato🇺🇸 · Zhite Yu🇺🇸

   Recently, a new framework for studying generic $2\to 3$ hard exclusive reactions, referred to as single-diffractive hard exclusive processes, has been introduced to provide a cleaner separation of the underlying physical mechanisms. In this work, we expand this formalism to the case of exclusive real-photon electroproduction off a nucleon, $e(\ell )+N(p)\to e({\ell }^{\prime })+N(p^{\prime })+\gamma (q^{\prime })$, which represents the classical channel for accessing generalized parton distributions (GPDs) in nucleons and nuclei. This extension enables a more systematic and physically transparent formulation of the reaction dynamics, paving the way for improved extractions of GPDs from experimental data as compared to existing approaches.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2026)·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.