Tue·Sep 2, 2025Tuesday·September 2, 2025

1. 01*

   Observation of hidden nuclear reactions on fast neutron-irradiated Lu isotopes

   Ihor Kadenko🇺🇦 · Barna Biró · András Fenyvesi · Vladyslav Morozyuk · Kateryna Okopna · Nadiia Sakhno

   Some nuclear reaction channels may not be easily identified, but they can still contribute to very important characteristics like nuclear reaction cross-sections, isomeric yields, etc. The dineutron, as a bound nucleus of two neutrons, can play hidden roles, as it is considered a product resulting from fast neutron-induced nuclear reactions involving the isotopes of lutetium. When being formed in the output channels, a bound dineutron allows for an explanation for unexpected enhancement of reaction cross-sections. We used available data and instrumental spectra to deeply consider the role of the dineutron in order to understand the consequences of its formation and subsequent decay upon transformations of nuclear reaction products. As a result, we obtained experimental confirmation that the half-life of 176gLu is significantly diminished within a certain time interval, which reveals an extremely high estimation for its cross-section of 10E+11 b. This is actually due to 176gLu "burnup", followed by the fusion between 175Lu and a deuteron. This introduces the existence of novel, low-energy reactions and fusion pathways under neutron irradiation, which in-turn, leads to implications for both basic nuclear physics and HEP, along with their applications.

   nucl-ex0 citations
2. 02*

   Comment on "Exploring Data-Driven Corrections for $\varphi$-Meson Global Spin Alignment Measurements" (arXiv:2508.18409)

   Jinhui Chen🇨🇳 · Diyu Shen🇨🇳 · Xu Sun🇨🇳 · Aihong Tang🇺🇸 · Baoshan Xi🇨🇳

   The method in arXiv:2508.18409 constructs a ``data-driven correction'' from combinatorial (pseudo-$\varphi$) pairs and applies it to the signal. An explicit decomposition shows that the construction calibrates the background response rather than the signal: it is defined by the difference between an acceptance-free pseudo-$\varphi$ surrogate and its data-level realization. Promoting a background-derived correction to a signal correction requires a strong physics proof that signal and background share identical detector response at the pair level -- including acceptance-anisotropy couplings and dependencies on parent kinematics -- which the manuscript does not establish. Consequently, local numerical proximity in a restricted region of phase space is incidental rather than evidentiary; validation must rest on mechanism, not numerical coincidence. Moreover, the pseudo-$\varphi$ background is non-unique: with infinitely many admissible constructions, any apparent agreement for a few cases would not be dispositive -- no finite scan can substitute for a mechanism-level response equivalence. In the absence of such a demonstrated equivalence, the construction should be regarded as a background calibration rather than a signal correction.

   nucl-exhep-ph0 citations
3. 03*

   Lifetimes and Transition Probabilities in $N=76^{130}Xe$

   D. Kumar🇮🇳 · S. Basak🇮🇳 · A. Pal🇮🇳 · D. Banerjee🇨🇭 · S.S. Alam🇮🇳 · S. Rajbanshi🇮🇳 · T. Bhattacharjee🇮🇳

   Lifetimes for the $4_1^{+}$ and $6_1^{+}$ states have been directly measured using $\gamma -\gamma$ fast timing technique for low lying states of ${}^{130}Xe$, populated from ${\beta }^{-}$ decay of the parent ${}^{130}I$ produced through ${}^{nat}U(\alpha ,f)$ reaction at $E_{\alpha }=40MeV$. VENTURE array comprising of eight fast CeBr${}_3$ detectors is used for lifetime measurement. The reduced transition probabilities deduced from the measured lifetimes have been compared with theoretical values obtained from the large basis shell model calculation and the interacting boson approximation (IBM) calculation.

   nucl-exNPA(2026)·1 citation
4. 04*

   The Evolution of Heavy-Ion Physics: A Data-Driven Analysis of Quark Matter Conferences

   Dong Jo Kim🇫🇮 · Tero Lappeteläinen

   This paper presents a data-driven analysis of Quark Matter conferences from 2011 to 2025, investigating trends in geographical representation, research emphasis, and methodological strategies. Using a dataset of over 10,000 presentations, the evolution of heavy-ion physics through its premier conference series is examined. The distribution of presentations across countries and institutions shows the global reach of the field while highlighting opportunities for broader international engagement. Research topics show clear temporal trends, with certain physics concepts rising and falling in prominence, and a gradual shift from facility-focused to phenomenon-focused research. The analysis reveals increasing integration between theoretical and experimental approaches over time, reflecting a maturing field where these complementary domains strengthen and enhance each other. These findings provide quantitative insights that the evolution of heavy-ion physics is strengthened by international collaboration at conferences. The analytical methods developed here could help other scientific communities understand their own patterns of knowledge sharing and development.

   ↳ physics.soc-phhep-exhep-phhep-th+10 citations
5. 05*

   Impacts of isolated nucleon-nucleon correlations in relativistic ${}^{16}$O+${}^{16}$O collisions

   Qi Liu🇨🇳 · Hadi Mehrabpour🇨🇳 · Bing-Nan Lu🇨🇳

   Nucleon-nucleon interactions are fundamental to the nuclear forces operating within the nucleus and play a crucial role in shaping the initial conditions of relativistic ion collisions through two-nucleon correlations. In this paper, we introduce an innovative approach to explore these encoded nucleon-nucleon correlations within advanced \textit{ab-initio} models in the context of relativistic ${}^{16}O$ collisions. Our methodology successfully reproduces the structural properties of the nucleonic configurations generated by these models, as well as the distance correlations between the nucleon pairs, denoted as $C(\Delta r)$. By generating nucleon positions that align with authentic configurations and adhering to the constraints imposed by the probability distribution of relative two-nucleon distances, our goal is to better understand nucleon-nucleon interactions within \textit{ab-initio} frameworks.

   ↳ nucl-thnucl-ex5 citations
6. 06*

   Quantitative imaging of 478-keV prompt gamma rays from boron neutron capture reactions

   Tetsuya Mizumoto · Shotaro Komura · Atsushi Takada · Yoshinori Sakurai · Toru Tanimori

   The accurate imaging and quantitative measurement of 478-keV prompt gamma rays are critical for advancing boron neutron capture therapy (BNCT), a promising cancer treatment. Although numerical simulations have indicated that such measurements are feasible, their practical application has proven challenging. This study introduces a gamma-ray imaging detector designed specifically for precise BNCT measurements. Using boron-rich phantom samples, we successfully imaged 478-keV gamma rays and established a linear correlation between gamma-ray production and boron concentration. Furthermore, applying this technique in a recognized BNCT treatment facility demonstrated the detector's effectiveness in monitoring boron dose distribution during neutron irradiation, both in pretreatment diagnostics and throughout the treatment process.

   ↳ physics.ins-detnucl-exphysics.med-phSci.Rep.(2025)·0 citations
7. 07*

   Testing perturbative QCD calculations with beauty-meson production in proton-proton collisions with ALICE

   Fabrizio Chinu (for the ALICE Collaboration)🇮🇹

   Measurements of the production cross section of beauty hadrons in proton-proton (pp) collisions provide excellent tests of perturbative quantum chromodynamics (pQCD) calculations. Theoretical approaches based on the factorisation theorem allow for the calculation of differential cross sections for hadron production as functions of transverse momentum ($p_{\mathrm{T}}$) and rapidity ($y$). Measurements down to low transverse momenta are also fundamental ingredients for the estimation of the $\mathrm{b}\overline{\mathrm{b}}$ production cross section. In this contribution, the measurement of ${\mathrm{B}}^0$-meson production in pp collisions at $\sqrt{s}=13.6$ TeV collected by the ALICE experiment during LHC Run 3 is presented. The ${\mathrm{B}}^0$ mesons are fully reconstructed via their decay channels into a D meson and a charged pion. The measured production cross section is compared with state-of-the-art pQCD calculations with next-to-leading order accuracy plus all-order resummation of next-to-leading logarithms.

   ↳ hep-exnucl-exEPJ Web Conf.(2026)·0 citations
8. 08*

   Testing hydrodynamic response to initial-state geometry in Pb+$d^{\uparrow }$ collisions

   Heikki Mäntysaari🇫🇮 · Björn Schenke🇺🇸 · Chun Shen🇺🇸 · Wenbin Zhao🇺🇸

   Deuterons with different polarization states have distinct shapes for their wavefunctions. This offers a unique opportunity to experimentally control the initial-state collision geometry with the polarization of the light-ion targets in relativistic heavy-ion experiments. We study the charged hadron elliptic flow coefficients with respect to the polarization angle of deuterons in Pb + polarized deuteron collisions using a hydrodynamics + hadronic transport model. Hydrodynamic response to initial-state geometry predicts a distinct sign of $v_2$ correlated with the deuteron's polarization states, providing a clean test case for elucidating the collective origin in small collision systems.

   ↳ nucl-thhep-phnucl-exEPJ Web Conf.(2026)·0 citations
9. 09*

   Event-by-event vortex rings in fixed-target p+Ar collisions

   David Chinellato🇧🇷 · Michael Lisa🇺🇸 · Willian Serenone🇧🇷 · Chun Shen🇺🇸 · Jun Takahashi🇧🇷 · Giorgio Torrieri🇧🇷

   We present event-by-event simulations for central asymmetric p+Ar collisions at $\sqrt{s_{\mathrm{NN}}}=68$ GeV to investigate the formation and evolution of vortex-ring structures from the early-stage longitudinal flow velocity profile. Our predictions for their imprints on Lambda hyperon's polarization observables are complementary to those presented in Ref. [Phys.Rev.C 110 (2024) 5, 054908] and can be explored in the future fixed-target collisions at the Large Hadron Collider beauty (LHCb) experiment.

   ↳ nucl-thhep-phnucl-exEPJ Web Conf.(2026)·0 citations
10. 10*

    $S$-wave kaon-nucleon interactions from lattice QCD at the physical point

    Kotaro Murakami🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Yan Lyu🇯🇵 · Wren Yamada🇯🇵

    We investigate S-wave kaon-nucleon ($KN$) interactions with strangeness $S=+1$ in lattice QCD using the time-dependent HAL QCD method. Employing the $(2+1)$-flavor gauge configuration with $m_{\pi }\approx 137\text{MeV}$ and $m_K\approx 502\text{MeV}$, we calculate the $KN$ potentials at the leading order in the derivative expansion. The potentials in both isospin channels ($I=1$ and $I=0$) exhibit repulsion at short distances, while only the $I=0$ potential has a small attractive pocket at intermediate distances. From these potentials, we compute the phase shifts as well as the low-energy scattering parameters. The obtained phase shifts show no signals corresponding to resonances or bound states in both isospin channels, suggesting the absence of the ${\Theta }^{+}(1540)$ pentaquark in the S-wave $KN$ systems. The results for $I=0$ suggest that the scattering amplitudes in this channel are dominated by P-wave components rather than S-wave.

    ↳ hep-lathep-phnucl-exnucl-thPRD(2026)·4 citations
11. 11*

    Beam test results of the Intermediate Silicon Tracker for sPHENIX

    C. W. Shih🇹🇼 · G. Nukazuka🇯🇵 · Y. Sugiyama🇯🇵 · Y. Akiba🇯🇵 · D. Cacace🇺🇸 · H. En'yo🇯🇵 · T. Hachiya🇯🇵 · S. Hasegawa🇯🇵 · M. Hata🇯🇵 · H. Imai🇯🇵 · C. M. Kuo🇹🇼 · M. Morita🇯🇵 and 13 other authors

    The Intermediate Silicon Tracker (INTT), a two-layer barrel silicon strip tracker, is a key component of the tracking system for sPHENIX at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The INTT is designed to enable the association of reconstructed tracks with individual RHIC bunch crossings. To evaluate the performance of preproduction INTT ladders and the readout chain, a beam test was conducted at the Research Center for Accelerator and Radioisotope Science, Tohoku University, Japan. This paper presents the performance of the INTT evaluated through studies of the signal-to-noise ratio, residual distribution, spatial resolution, hit-detection efficiency, and multiple track reconstruction.

    ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2026)·3 citations
12. 12*

    Zemach radii and nuclear structure effects in hyperfine splitting of Lithium

    Yilong Yang🇹🇼 · Evgeny Epelbaum🇩🇪 · Chen Ji🇨🇳 · Pengwei Zhao

    Nuclear structure effects are essential for describing hyperfine splittings from high-precision atomic spectroscopy measurements. These effects are often parametrized by the effective or elastic Zemach radii, with their difference poorly understood. We solve the longstanding discrepancy between the effective and elastic Zemach radii in ${}^6$Li and ${}^7$Li by performing \emph{ab initio} nuclear structure calculations that take into account nuclear polarizability effects. Our results demonstrate that nuclear polarizability effects, negligible in ${}^7$Li, dominate in ${}^6$Li and explain the observed significant deviation between the effective and elastic Zemach radii. Furthermore, we show that the ratios between the nuclear polarizability contributions in different nuclei are universal in the limit of closure and SU(4) symmetry of nuclear forces. In particular, the nuclear polarizability contribution in an odd-odd nucleus is enhanced by a factor of ${\mu }_p/({\mu }_p+{\mu }_n)\simeq 3$, with ${\mu }_{n,p}$ denoting the nucleon magnetic moments, compared to its odd-$A$ isotopes. The same mechanism also explains the Zemach radius deviations observed in ${}^2$H and ${}^3$He. These findings establish nuclear polarizability as the dominant source of isotope-dependent nuclear corrections to hyperfine splitting in light atoms.

    ↳ nucl-thnucl-exphysics.atom-ph7 citations
13. 13*

    Hunting for Axions in REactor neutrino COherent scattering Detection Experiment

    Wei Dai🇨🇳 · Yuanlin Gong🇨🇳 · Guanhua Gu🇨🇳 · Liangliang Su🇨🇳 · Li Wang🇨🇳 · Lei Wu🇨🇳 · Yongcheng Wu🇨🇳 · Litao Yang🇨🇳

    Nuclear power plants are not only vital sources of clean energy but also powerful facilities for probing new physics beyond the Standard Model. Due to the intense gamma-ray flux and an appropriate energy conditions, they are particularly well-suited for searches of light hypothetical particles such as sub-MeV axions and axion-like particles (ALPs). In this work, we propose to search for the ALPs in the REactor Neutrino COherent scattering Detection Experiment (RECODE), where two low-threshold, high-purity germanium detectors are placed at 11 m (near point) and 22 m (far point) from a 3.4 GW nuclear reactor at Sanmen nuclear power plant. With a 10 kg$\cdot$year exposure, we demonstrate that the expected sensitivities to the ALP couplings to the electrons and photons are competitive with or surpass the available results from the beam-dump experiments. A planned upgrade to 100 kg$\cdot$year will fully cover the so-called { cosmological triangle} region, probing unexplored parameter space relevant to axions.

    ↳ hep-phhep-exnucl-ex5 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.