Tue·Dec 17, 2024Tuesday·December 17, 2024

1. 01*

   Nuclear structure and direct reaction studies in particle-$\gamma$ coincidence experiments at the FSU John D. Fox Superconducting Linear Accelerator Laboratory

   M. Spieker🇺🇸 · S. Almaraz-Calderon

   Since its foundation in the 1960s, the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University (FSU) pursued research at the forefront of nuclear science. In this contribution, we present recent highlights from nuclear structure and reaction studies conducted at the John D. Fox Superconducting Linear Accelerator Laboratory, also featuring the general experimental capabilities at the laboratory for particle-$\gamma$ coincidence experiments. Specifically, we focus on light-ion induced reactions measured with the Super-Enge Split-Pole Spectrograph (SE-SPS) and the CATRiNA neutron detectors, respectively. Some results obtained with the CeBrA demonstrator for particle-$\gamma$ coincidence experiments at the SE-SPS are presented. A highlight from the first experimental campaigns with the combined CLARION2-TRINITY setup, showing that weak reaction channels can be selected, is discussed as well.

   nucl-exnucl-thFront.in Phys.(2024)·4 citations
2. 02*

   Isotopic Transparency in Central Xe+Sn Collisions at 100 MeV/nucleon

   Arnaud Le Fèvre🇩🇪 · Abdelouahad Chbihi🇫🇷 · Quentin Fable🇫🇷 · Tom Génard🇫🇷 · Jerzy Łukasik🇵🇱 · Wolfgang Trautmann🇩🇪 · Ketel Turzó🇩🇪 · Rémi Bougault🇫🇷 · Sylvie Hudan🇺🇸 · Olivier Lopez🇫🇷 · Walter F. J. Müller🇩🇪 · Carsten Schwarz🇩🇪 and 4 other authors

   A new method, based on comparing isotopic yield ratios measured at forward and sideward polar angles and on cross-bombarding heavy nuclei with different neutron-to-proton ratios, is used to quantify the stopping power of nuclear matter in heavy-ion collisions. For central collisions of isotopically separated ${}^{124,129}$Xe+${}^{112,124}$Sn at 100~MeV/nucleon bombarding energy, measured with the 4$\pi$ multidetector INDRA at GSI, a moderate transparency is deduced for hydrogen isotopes, whereas for heavier fragmentation products with atomic number $Z\ge 3$ a high transparency exceeding 50\% is observed. An anomalously large transparency is found for alpha particles, and possible explanations are presented.

   nucl-exnucl-thPLB(2025)·1 citation
3. 03*

   The evidence of $N=16$ shell closure and $\beta$-delayed neutron emission from ${}^{25}$F

   J. F. Peltier · Z. Y. Xu🇧🇪 · I. Cox🇺🇸 · R. Grzywacz🇺🇸 · R. S. Lubna🇺🇸 · N. Kitamura🇯🇵 · S. Neupane🇺🇸 · J. M. Allmond🇺🇸 · J. Christie · A. A. Doetsch🇺🇸 · P. Dyszel · T. Gaballah🇺🇸 and 7 other authors

   We measured the $\beta$-delayed neutron emission from ${}^{25}$F for the first time at the Facility for Rare Isotope Beams (FRIB). Using combined neutron and $\gamma$-ray detector systems of the FRIB Decay Station Initiator (FDSi), we observed $\beta$-decay transitions populating neutron unbound states between 4.2 and 8 MeV in ${}^{25}$Ne. The experimental results led to the revision of the $\beta$-decay half-life and $\beta$-delayed neutron-emission probability of ${}^{25}$F. The $\beta$-decay strength distribution of ${}^{25}$F extracted from the data agrees with the shell-model predictions using the USDB and SDPF-M effective interactions. This result indicates that the spherical neutron $N=16$ shell gap persists in ${}^{25}$F and ${}^{25}$Ne.

   nucl-exPLB(2025)·2 citations
4. 04*

   Bottomoniumlike states in proton collisions: Fragmentation and resummation

   Francesco Giovanni Celiberto🇪🇸 · Gabriele Gatto🇮🇹

   We study the semi-inclusive hadroproduction of doubly bottomed tetraquarks ($X_{b\bar{b}q\bar{q}}$) as well as fully bottomed ones ($T_{4b}$), to which we collectively refer as "bottomoniumlike" states. We rely upon the variable-flavor number-scheme fragmentation at leading power, where a single parton perturbatively splits into the corresponding Fock state, which then hadronizes into the color-neutral, observed tetraquark. To this end, we build new sets of DGLAP/HF-NRevo consistent, hadron-structure oriented collinear fragmentation functions, which we name TQHL1.1 and TQ4Q1.1 parametrizations. They extend and supersede the corresponding 1.0 versions recently derived in previous works. The first family describes the fragmentation of doubly heavy tetraquarks and is based on an improved version of the Suzuki model for the heavy-quark channel. The second family depicts the fragmentation of fully heavy tetraquarks and embodies initial-scale inputs for gluon and heavy-quark channels, both of them calculated by the hands of potential nonrelativistic QCD. As a phenomenological application, we provide novel predictions for tetraquark-plus-jet high-energy distributions, computed within the NLL/NLO${}^{+}$ hybrid factorization from (sym)JETHAD, at 14 TeV and 100 TeV FCC.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2025)·22 citations
5. 05*

   Likelihood of a zero in the proton elastic electric form factor

   Peng Cheng🇨🇳 · Zhao-Qian Yao🇪🇸 · Daniele Binosi🇮🇹 · Craig D. Roberts🇨🇳

   Working with the $29$ available data on the ratio of proton electric and magnetic form factors, ${\mu }_p{G}_E^p(Q^2)/G_M^p(Q^2)$, and independent of any model or theory of strong interactions, we use the Schlessinger point method to objectively address the question of whether the ratio possesses a zero and, if so, its location. Our analysis predicts that, with 50% confidence, the data are consistent with the existence of a zero in the ratio on $Q^2\le 10.37$GeV${}^2$. The level of confidence increases to $99.9$\% on $Q^2\le 13.06$GeV${}^2$. Significantly, the likelihood that existing data are consistent with the absence of a zero in the ratio on $Q^2\le 14.49$GeV${}^2$ is $1/1$-million.

   ↳ hep-phhep-exhep-latnucl-ex+1PLB(2025)·11 citations
6. 06*

   Detecting the Coupling of Axion Dark Matter to Neutron Spins at Spallation Sources via Rabi Oscillation

   Peter Fierlinger🇩🇪 · Jie Sheng🇨🇳 · Yevgeny V. Stadnik🇦🇺 · Chuan-Yang Xing🇨🇳

   We propose a novel detection method for axion dark matter using the Rabi oscillation of neutron spins in beam-based measurements. If axions couple to neutron spins, a background oscillating axion dark matter field would drive transitions between spin-up and spin-down neutron states in a magnetic field when the axion particle energy matches the energy gap between the spin states. The transition can be detected in a double-Stern-Gerlach-type apparatus, with the first splitter producing a pure spin-polarized neutron beam and the second splitter selecting spin-flipped signals. Our approach offers enhanced detection capability for axions within the $10^{-12}-10^{-10}$eV mass window with the capability to surpass the sensitivity of current laboratory experiments.

   ↳ hep-phastro-ph.COnucl-exphysics.ins-det3 citations
7. 07*

   Supernova Detection at SNOLAB

   Erica Caden🇨🇦 · Stephen Sekula🇨🇦 · Stanley Yen🇨🇦

   Neutrinos carry most of the energy released by a core-collapse supernova. SNOLAB has two neutrino-capable detectors, SNO+ and HALO, that have complementary neutrino flavour sensitivities. SNOLAB is also host to existing facilities, or plans to host future projects, that can enhance sensitivity to these neutrinos. These detectors, together with others worldwide both in existence and planned, will provide insights to a variety of different models using neutrinos from the next galactic supernova.

   ↳ hep-exastro-ph.HEnucl-exCan.J.Phys.(2025)·3 citations
8. 08*

   Anisotropic jet broadening and jet shape

   Weiyao Ke🇨🇳 · John Terry🇺🇸 · Ivan Vitev🇺🇸

   In this paper, we explore the use of jet substructure as a way of probing phenomena which break the isotropic behavior of jets, such as jet propagation through an anisotropically flowing quark-gluon plasma or spin correlations. We introduce two novel observables for this purpose: the azimuthal-dependent jet broadening and the azimuthal-dependent jet shape, which generalize the traditional isotropic substructure studies. Using Soft-Collinear Effective Theory, we explicitly calculate the jet functions associated with these observables with a standard jet axis and with a Winner-Take-All jet axis in both the resummed and fixed order limits. While our analysis first and foremost establishes the formalism for the azimuthal-dependent jet substructure, it also brings to light new results for jet substructure in the azimuthally integrated case, such as the semi-inclusive jet function and the exclusive jet shape for the Winner-Take-All axis, and the jet broadening in the fixed order region. As an illustrative example for the new formalism we demonstrate that the azimuthal-dependent jet broadening can be used as a direct probe of the transversity parton distribution function in deep inelastic scattering.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2025)·9 citations
9. 09*

   QCD factorization with multihadron fragmentation functions

   T. C. Rogers🇺🇸 · M. Radici🇮🇹 · A. Courtoy🇲🇽 · T. Rainaldi🇺🇸

   Important aspects of QCD factorization theorems are the properties of the objects involved that can be identified as universal. One example is that the definitions of parton densities and fragmentation functions for different types of hadrons differ only in the identity of the nonperturbative states that form the matrix elements, but are otherwise the same. This leads to independence of perturbative calculations on nonperturbative details of external states. It also lends support to interpretations of correlation functions as encapsulations of intrinsic nonperturbative properties. These characteristics have usually been presumed to still hold true in fragmentation functions even when the observed nonperturbative state is a small-mass cluster of $n$ hadrons rather than simply a single isolated hadron. However, the multidifferential aspect of cross sections that rely on these latter types of fragmentation functions complicates the treatment of kinematical approximations in factorization derivations. That has led to recent claims that the operator definitions for fragmentation functions need to be modified from the single hadron case with nonuniversal prefactors. With such concerns as our motivation, we retrace the steps for factorizing the unpolarized semi-inclusive $e^{+}{e}^{-}$ annihilation cross section and confirm that they do apply without modification to the case of a small-mass multihadron observed in the final state. In particular, we verify that the standard operator definition from single hadron fragmentation, with its usual prefactor, remains equally valid for the small-mass $n$-hadron case with the same hard parts and evolution kernels, whereas the more recently proposed definitions with nonuniversal prefactors do not. Our results reaffirm the reliability of most past phenomenological applications of dihadron fragmentation functions.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2025)·18 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.