Thu·Mar 7, 2024Thursday·March 7, 2024

1. 01*

   Neutron radius determination of 133Cs and its impact on the interpretation of CEvNS-CsI measurement

   Y. Huang🇨🇳 · S. Y. Xia🇨🇳 · Y. F. Li🇨🇳 · X. L. Tu🇨🇳 · J. T. Zhang🇨🇳 · C. J. Shao🇨🇳 · K. Yue🇨🇳 · P. Ma🇨🇳 · Y. F. Niu🇨🇳 · Z. P. Li🇨🇳 · Y. Kuang🇨🇳 · X. Q. Liu🇨🇳 and 7 other authors

   Proton-${}^{133}$Cs elastic scattering at low momentum transfer is performed using an in-ring reaction technique at the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou. Recoil protons from the elastic collisions between the internal H${}_2$-gas target and the circulating ${}^{133}$Cs ions at 199.4 MeV/u are detected by a silicon-strip detector. The matter radius of ${}^{133}$Cs is deduced by describing the measured differential cross sections using the Glauber model. Employing the adopted proton distribution radius, a point-neutron radius of 4.86(21) fm for ${}^{133}$Cs is obtained. With the newly determined neutron radius, the weak mixing angle sin${}^2{\theta }_W$ is independently extracted to be 0.227(28) by fitting the coherent elastic neutrino-nucleus scattering data. Our work limits the sin${}^2{\theta }_W$ value in a range smaller than the ones proposed by the previous independent approaches, and would play an important role in searching new physics via the high precision CE$\nu$NS-CsI cross section data in the near future.

   nucl-exnucl-thPLB(2024)·9 citations
2. 02*

   Quark Counting, Drell-Yan West, and the Pion Wave Function

   Mary Alberg🇺🇸 · Gerald A. Miller🇺🇸

   The relation between the pion's quark distribution function, $q(x)$, its light-front wave function, and the elastic charge form factor, $F({\Delta }^2)$ is explored. The square of the leading-twist pion wave function at a special probe scale, ${\zeta }_H$, is determined using models and Poincare covariance from realistic results for $q(x)$. This wave function is then used to compute form factors with the result that the Drell-Yan-West and quark counting relationships are not satisfied. A new relationship between $q(x)$ and $F({\Delta }^2)$ is proposed.

   ↳ hep-phnucl-exnucl-thPRC(2024)·5 citations
3. 03*

   Microscopic description of hexadecapole collectivity in even-even rare-earth nuclei near $N=90$

   L. Lotina · K. Nomura🇯🇵

   We present an extensive study of hexadecapole correlations in the rare-earth region near $N=90$ and the effects these correlations have on various nuclear properties, such as the low-energy spectra, as well as quadrupole, hexadecapole, and monopole transition strengths. In order to examine hexadecapole correlations, we employ a mapped $sdg$ interacting boson model, with parameters derived from a self-consistent mean-field calculations with a relativistic energy density functional. We apply this model to even-even isotopes of Nd, Sm, Gd, Dy, and Er ($Z=60-68$) with neutron numbers $N=84-96$. The obtained results show a good agreement with the experiment. By comparing the results with the ones obtained from a simpler mapped $sd$ interacting boson model, we show that the inclusion of the hexadecapole degree of freedom via $g$ boson is necessary to improve the results of the $J^{\pi }\ge 6^{+}$ yrast energies in the nuclei with $N=84$ and 86, being near the neutron shell closure. The $sdg$ interacting boson model increases the quadrupole transition strengths between yrast states in the $N=90$ and 92 well deformed nuclei, which is in good agreement with the experiment for most of those isotopes. The presence of $g$ bosons does have an important effect on hexadecapole transition strengths, although experimental data for such transitions are limited. The obtained monopole transition strengths do not differ significantly from the ones obtained from the simpler $sd$ model.

   ↳ nucl-thnucl-exPRC(2024)·9 citations
4. 04*

   Controlling volume fluctuations for studies of critical phenomena in nuclear collisions

   Romain Holzmann🇩🇪 · Volker Koch🇺🇸 · Anar Rustamov🇩🇪 · Joachim Stroth🇩🇪

   We generalize and extend the recently proposed method to account for contributions of system size (or volume/participant) fluctuations to the experimentally measured moments of particle multiplicity distributions. We find that in the general case there are additional biases which are not directly accessible to experiment. These biases are, however, parametrically suppressed if the multiplicity of the particles of interest is small compared to the total charged-particle multiplicity, e.g., in the case of proton number fluctuations at top RHIC and LHC energies. They are also small if the multiplicity distribution of charged particles per wounded nucleon is close to the Poissonian limit, which is the case at low energy nuclear collisions, e.g., at GSI/SIS18. We further find that mixed events are not necessarily needed to extract the correction for volume fluctuations, albeit it can help if event statistics is small, which is typically the case for reconstructing the higher-order cumulants. We provide the formulas to correct pure and mixed cumulants of particle multiplicity distributions up to any order together with their associated biases.

   ↳ nucl-thhep-exhep-phnucl-exNPA(2024)·16 citations
5. 05*

   An assessment of $\mathbf{{\rm Y}}$-states above $\mathbf{B}\bar{\mathbf{B}}$-threshold using a constituent-quark-model based meson-meson coupled-channels framework

   P. G. Ortega🇪🇸 · D. R. Entem🇪🇸 · F. Fernández🇪🇸 · J. Segovia🇪🇸

   The ${\rm Y}(10753)$ state has been recently observed by the Belle and Belle~II collaborations with enough global significance to motivate an assessment of the high-energy spectrum usually predicted by any reasonable \emph{naïve} quark model. In the framework of a constituent quark model which satisfactorily describes a wide range of properties of conventional hadrons containing heavy quarks, the quark-antiquark and meson-meson degrees of freedom have been incorporated with the goal of elucidating the influence of open-bottom meson-meson thresholds into the ${\rm Y}$ states whose masses are within the energy range of the ${\rm Y}(10753)$'s mass. It is well known that such effects could be relevant enough as to generate dynamically new states and thus provide a plausible explanation of the nature of the ${\rm Y}(10753)$ state. In particular, we have performed a coupled-channels calculation in which the bare states ${\rm Y}(4S)$, ${\rm Y}(3D)$, ${\rm Y}(5S)$ and ${\rm Y}(4D)$ are considered together with the threshold channels $B\bar{B}$, $B{\bar{B}}^{\ast }$, $B^{\ast }{\bar{B}}^{\ast }$, $B_s{\bar{B}}_s$, $B_s{\bar{B}}_s^{\ast }$ and $B_s^{\ast }{\bar{B}}_s^{\ast }$. Among the results we have described, the following conclusions are of particular interest: (i) a richer complex spectrum is gained when thresholds are present and bare bound states are sufficiently non-relativistic; (ii) those poles obtained in the complex energy plane do not have to appear as simple peaks in the relevant cross sections; and (iii) the ${\rm Y}(10750)$ candidate is interpreted as a dressed hadronic resonance whose structure is an equally mixture of a conventional $b\bar{b}$ state and $B^{\ast }{\bar{B}}^{\ast }$ molecule.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2024)·4 citations
6. 06*

   Strengthening nuclear symmetry energy constraints using multiple resonant shattering flares of neutron stars with realistic mass uncertainties

   Duncan Neill🇬🇧 · David Tsang🇬🇧 · William G. Newton🇺🇸

   With current and planned gravitational-wave (GW) observing runs, coincident multimessenger timing of Resonant Shattering Flares (RSFs) and GWs may soon allow for neutron star (NS) asteroseismology to be used to constrain the nuclear symmetry energy, an important property of fundamental nuclear physics that influences the composition and equation of state of NSs. In this work we examine the effects of combining multiple RSF detections on these symmetry energy constraints, and consider how realistic uncertainties in the masses of the progenitor NSs may weaken them. We show that the detection of subsequent multimessenger events has the potential to substantially improve constraints beyond those obtained from the first, and that this improvement is insensitive to the mass of the NSs which produce the RSFs and its uncertainty. This sets these asteroseismic constraints apart from bulk NS properties such as radius, for which the NS mass is highly important, meaning that any multimessenger RSF and GW events can equally improve our knowledge of fundamental physics.

   ↳ astro-ph.HEnucl-exMNRAS(2024)·5 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.