Tue·Sep 27, 2022Tuesday·September 27, 2022

1. 01*

   Jefferson Lab Hall C: Precision Physics at the Luminosity Frontier

   J. Benesch🇺🇸 · V. Berdnikov🇺🇸 · P. Brindza🇺🇸 · S. Covrig Dusa🇺🇸 · D. Dutta🇺🇸 · D. Gaskell🇺🇸 · T. Gogami🇯🇵 · J.M. Grames🇺🇸 · D.J. Hamilton🇬🇧 · D.W. Higinbotham🇺🇸 · T. Horn🇺🇸 · G.M. Huber🇨🇦 and 19 other authors

   Over the last three decades, Hall C has been a key contributor to progress in the understanding of hadron structure and interactions. An outline of a potential future Hall C physics program focused on precision measurements of small cross sections is presented. A detailed overview of this unique facility, whose flexible configuration allows many opportunities for new experimental equipment that help address a wide range of questions in hadronic physics, is included as well.

   nucl-ex5 citations
2. 02*

   Higher-Order Cumulants and Correlation Functions of Proton Multiplicity Distributions in $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV Au+Au Collisions at the RHIC STAR Experiment

   STAR Collaboration: M. S. Abdallah · B. E. Aboona · J. Adam · L. Adamczyk · J. R. Adams · J. K. Adkins · I. Aggarwal · M. M. Aggarwal · Z. Ahammed · D. M. Anderson · E. C. Aschenauer · J. Atchison and 361 other authors

   We report a measurement of cumulants and correlation functions of event-by-event proton multiplicity distributions from fixed-target Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV measured by the STAR experiment. Protons are identified within the rapidity ($y$) and transverse momentum ($p_{\mathrm{T}}$) region $-0.9<y<0$ and $0.4<p_{\mathrm{T}}<2.0$ GeV/$c$ in the center-of-mass frame. A systematic analysis of the proton cumulants and correlation functions up to sixth-order as well as the corresponding ratios as a function of the collision centrality, $p_{\mathrm{T}}$, and $y$ are presented. The effect of pileup and initial volume fluctuations on these observables and the respective corrections are discussed in detail. The results are compared to calculations from the hadronic transport UrQMD model as well as a hydrodynamic model. In the most central 5\% collisions, the value of proton cumulant ratio $C_4/C_2$ is negative, drastically different from the values observed in Au+Au collisions at higher energies. Compared to model calculations including Lattice QCD, a hadronic transport model, and a hydrodynamic model, the strong suppression in the ratio of $C_4/C_2$ at 3 GeV Au+Au collisions indicates an energy regime dominated by hadronic interactions.

   nucl-exhep-exhep-lathep-ph+1PRC(2023)·69 citations
3. 03*

   An Indirect Measurement of ${}^6$Li(n,$\gamma$) Cross Sections

   Midhun C.V · M.M Musthafa · S.V Suryanarayana · Gokuldas H · Shaima A🇯🇵 · Hajara. K · Antony Joseph · T. Santhosh · A. Baishya · A Pal🇮🇳 · P.C Rout · S Santra🇮🇳 and 5 other authors

   The ${}^6$Li(n,$\gamma$)${}^7$Li cross sections in the neutron energy range of 0.6 to 4 MeV have been measured by the experimental implementation of the direct capture formalism. This was done by measuring the $\gamma$ transition probability experimentally and accounting for the spin factor by theoretical calculation. The electromagnetic transition probabilities from ${}^7$Li${}^{\ast }$ analogous to the initial neutron capture states of ${}^6$Li$+n$ were measured by populating the J${}_i$ states of ${}^7$Li through ${}^7$Li($p,p^{\prime }$)${}^7$Li${}^{\ast }$ reaction. The impact of coupling of resonant states, above neutron separation threshold of ${}^7$Li, in the neutron capture, is observed from the capture $\gamma$ spectrum. The measured cross sections were reproduced through {\sc fresco} and Talys-1.95 Direct Capture Calculations.

   nucl-exnucl-th3 citations
4. 04*

   Probing the quadrupole transition strength of 15C via deuteron inelastic scattering

   J. Chen🇺🇸 · B. P. Kay🇺🇸 · T. L. Tang🇺🇸 · I. A. Tolstukhin🇺🇸 · C. R. Hoffman🇺🇸 · H. Li🇨🇳 · P. Yin🇨🇳 · X. Zhao🇨🇳 · P. Maris🇺🇸 · J. P. Vary🇺🇸 · G. Li🇨🇳 · J. L. Lou🇨🇳 and 13 other authors

   Deuteron elastic scattering from 15C and inelastic scattering reactions to the first excited state of 15C were studied using a radioactive beam of 15C in inverse kinematics. The scattered deuterons were measured using HELIOS. The elastic scattering differential cross sections were analyzed using the optical model. A matter deformation length {\delta}d = 1.04(11) fm has been extracted from the differential cross sections of inelastic scattering to the first excited state. The ratio of neutron and proton matrix elements Mn/Mp = 3.6(4) has been determined from this quadrupole transition. Neutron effective charges and core-polarization parameters of 15C were determined and discussed. Results from ab-initio no-core configuration interaction calculations were also compared with the experimental observations. This result supports a moderate core decoupling effect of the valence neutron in 15C similarly to its isotone 17O, in line with the interpretation of other neutron-rich carbon isotopes.

   nucl-exPRC(2022)·9 citations
5. 05*

   Absolute ${}^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons

   A. Watanabe🇯🇵 · K. Sekiguchi🇯🇵 · T. Ino🇯🇵 · M. Inoue · S. Nakai🇯🇵 · Y. Otake🇯🇵 · A. Taketani🇯🇵 · Y. Wakabayashi🇯🇵

   We present an absolute ${}^3$He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a ${}^3$He nucleus has a large absorption cross section and a spin dependence for thermal neutrons. The cell had a pumping chamber and a target chamber. Polarized ${}^3$He gas was produced in the pumping chamber by SEOP and then diffused into the target chamber. The ${}^3$He polarization in the target chamber was determined by comparing the neutron transmissions with the polarized and unpolarized targets. The measurement was performed at the RIKEN Accelerator-Driven Compact Neutron Source. The ${}^3$He polarization in the target chamber was determined with a statistical error of 1.8% and systematic uncertainty of 0.6%. This method can be used to obtain high-precision data of spin observables in few-nucleon scattering for the investigation of nuclear forces.

   nucl-exphysics.ins-detNucl.Instrum.Meth.A(2022)·2 citations
6. 06*

   Measurement of the Neutron Cross Section on Argon Between 95 and 720 MeV

   S. Martynenko🇺🇸 · B. Bhandari🇺🇸 · J. Bian🇺🇸 · K. Bilton🇺🇸 · C. Callahan🇺🇸 · J. Chaves🇺🇸 · H. Chen🇺🇸 · D. Cline🇺🇸 · R. L. Cooper🇺🇸 · D. L. Danielson🇺🇸 · J. Danielson🇺🇸 · N. Dokania🇺🇸 and 63 other authors

   We report an extended measurement of the neutron cross section on argon in the energy range of 95-720 MeV. The measurement was obtained with a 4.3-hour exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. Compared to an earlier analysis of the same data, this extended analysis includes a reassessment of systematic uncertainties, in particular related to unused wires in the upstream part of the detector. Using this information we doubled the fiducial volume in the experiment and increased the statistics by a factor of 2.4. We also shifted the analysis from energy bins to time-of-flight bins. This change reduced the overall considered energy range, but improved the understanding of the energy spectrum of incoming neutrons in each bin. Overall, the new measurements are extracted from a fit to the attenuation of the neutron flux in five time-of-flight regions: 140 ns - 180 ns, 120 ns - 140 ns, 112 ns - 120 ns, 104 ns - 112 ns, 96 ns - 104 ns. The final cross sections are given for the flux-averaged energy in each time-of-flight bin: $\sigma (146\mathrm{MeV})=0.60_{-0.14}^{+0.14}\pm 0.08$(syst) b, $\sigma (236\mathrm{MeV})=0.72_{-0.10}^{+0.10}\pm 0.04$(syst) b, $\sigma (319\mathrm{MeV})=0.80_{-0.12}^{+0.13}\pm 0.040$(syst) b, $\sigma (404\mathrm{MeV})=0.74_{-0.09}^{+0.14}\pm 0.04$(syst) b, $\sigma (543\mathrm{MeV})=0.74_{-0.09}^{+0.09}\pm 0.04$(syst) b.

   nucl-exhep-exPRD(2023)·6 citations
7. 07*

   Determination of Lattice QCD Equation of state at a finite chemical potential

   Sabarnya Mitra🇮🇳

   Exponential resummation to all orders in ${\mu }_B$ is a promising scheme which can capture contributions to all orders in ${\mu }_B$ by considering only the first few Taylor coefficients in the Taylor expansion of thermodynamic observables in lattice QCD. This approach however, gets affected by biased estimates of $n$-point correlation functions $D_n$ whose effects can significantly hinder probe of finite density QCD. We present an unbiased exponential resummation formalism, which can reproduce the Taylor series up to the desired order in ${\mu }_B$, besides retaining the original form of the all-order resummation estimate of QCD partition function.

   ↳ hep-lathep-phnucl-exnucl-thSpringer Proc.Phys.(2024)·5 citations
8. 08*

   Model study on ${\rm Y}(nS)$ modification in small collision systems

   Junlee Kim🇰🇷 · Jinjoo Seo🇰🇷 · Byungsik Hong🇰🇷 · Juhee Hong🇰🇷 · Eun-Joo Kim🇰🇷 · Yongsun Kim🇰🇷 · MinJung Kweon🇰🇷 · Su Houng Lee🇰🇷 · Sanghoon Lim🇰🇷 · Jaebeom Park🇰🇷

   Quarkonium production has been studied extensively in relativistic heavy-ion collision experiments to understand the properties of the quark gluon plasma. The experimental results on the yield modification in heavy-ion collisions relative to that in $p$+$p$ collisions can be described by several models considering dissociation and regeneration effects. A yield modification beyond initial-state effects has also been observed in small collision systems such as $p$+Au and $p$+Pb collisions, but it is still premature to claim any hot medium effect. A model study in various small collision systems such as $p$+$p$, $p$+Pb, $p$+O, and O+O collisions will help quantitatively understanding nuclear effects on the ${\rm Y}(nS)$ production. A theoretical calculation considering the gluo-dissociation and inelastic parton scattering and their inverse reaction reasonably describes the suppression of ${\rm Y}(1S)$ in Pb+Pb collisions. Based on this calculation, a Monte-Carlo simulation is developed to more realistically incorporate the medium produced in heavy-ion collisions with event-by-event initial collision geometry and hydrodynamic evolution. We extend this framework to small systems to study the medium effects. In this work, we quantify the nuclear modification factor of ${\rm Y}(nS)$ as a function of charged particle multiplicity ($d{N}_{ch}/d\eta$) and transverse momentum. We also calculate the elliptic flow of ${\rm Y}(nS)$ in small collision systems.

   ↳ nucl-thnucl-exPRC(2023)·11 citations
9. 09*

   Kaon spectrum revisited

   U. Taboada-Nieto🇪🇸 · P.G. Ortega🇪🇸 · D.R. Entem🇪🇸 · F. Fernández🇪🇸 · J. Segovia🇪🇸

   The European Organization for Nuclear Research (CERN) has recently approved a world-unique QCD facility in which an updated version of the external M2 beam line of the CERN SPS in conjunction with a universal spectrometer of the COMPASS experiment is used. One of its main goals is to use highly intense and energetic kaon beams to map out the complete spectrum of excited kaons with an unprecedented precision; having a broad impact not only on low-energy QCD phenomenology, but also on many high-energy particle processes where excited kaons appear, such as the study of CP violation in heavy-meson decays studied at LHCb and Belle~II. In support of the experimental effort, the kaon spectrum is computed herein using a constituent quark model which has been successfully applied to a wide range of hadronic observables, from light to heavy quark sectors, and thus the model parameters are completely constrained. The model's prediction can be used as a template against which to compare the already collected data and future experimental findings, in order to distinguish between conventional and exotic kaon states. We also compare our results with those available in the literature in order to provide some general statements, common to all calculations.

   ↳ hep-phhep-exhep-latnucl-ex+1EPJA(2023)·13 citations
10. 10*

    Prospects to study hyperon-nucleon interactions at BESIII

    Jianping Dai🇨🇳 · Hai-Bo Li🇨🇳 · Han Miao🇨🇳 · Jianyu Zhang🇨🇳

    The prospects to study hyperon-nuclei/nucleon interactions at BESIII and similar $e^{+}{e}^{-}$ colliders are proposed in this work. Utilizing the large quantity of hyperons produced by the decay of 10 billion $J/\psi$ and 2.7 billion $\psi (3686)$ collected at BESIII, the cross sections of several specific elastic or inelastic hyperon-nuclei reactions can be measured via the scattering between the hyperons and the nucleus in the dense objects of BESIII detector. Subsequently, the cross sections of corresponding hyperon-nucleon interactions are able to be extracted with further phenomenological calculation. Furthermore, the interactions between antihyperon and nuclei/nucleon, including scattering and annihilation, can also be studied via the method proposed in this paper. The results will definitely benefit a lot the precise probe of the hyperon-nuclei/nucleon interactions and provide constraints for the studies of the potential of strong interaction, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars. In addition, the desirable prospects of corresponding studies in the future Super Tau-Charm Factory (STCF) are discussed and estimated in this work.

    ↳ hep-exhep-phnucl-exCPC(2024)·32 citations
11. 11*

    The dual King relation

    Yasuhiro Yamamoto🇹🇼

    We introduce a new linear relation in the isotope shifts of atomic spectroscopy. While the famous King relation is the linear relation among the different transitions, the new one is the linear relation among the different isotope pairs. Since we obtain this relation by exchanging the roles of the electronic and the nuclear factors in the original relation, we call it the dual King relation. This relation shows us similar information to the original King relation without including new fit parameters when we measure the isotope shifts of many transitions. In the dual King relation, the fit coefficients consist of the nuclear factors. Then, the fit results give us constraints to the ratios of the isotope dependence independent of the electron wave functions. This helps us to test the origin of unknown higher order isotope shifts. We show that the dual King relation can also be employed to constrain the weakly interacting light new boson at the same level as the original King relation.

    ↳ physics.atom-phhep-phnucl-exnucl-thPLB(2023)·2 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.