Tue·Apr 11, 2023Tuesday·April 11, 2023

1. 01*

   Measurement of the J/$\psi$ photoproduction cross section over the full near-threshold kinematic region

   GlueX Collaboration: S. Adhikari · F. Afzal · C. S. Akondi · M. Albrecht · M. Amaryan · V. Arroyave · A. Asaturyan · A. Austregesilo · Z. Baldwin · F. Barbosa · J. Barlow · E. Barriga and 140 other authors

   We report the total and differential cross sections for $J/\psi$ photoproduction with the large acceptance GlueX spectrometer for photon beam energies from the threshold at 8.2~GeV up to 11.44~GeV and over the full kinematic range of momentum transfer squared, $t$. Such coverage facilitates the extrapolation of the differential cross sections to the forward ($t=0$) point beyond the physical region. The forward cross section is used by many theoretical models and plays an important role in understanding $J/\psi$ photoproduction and its relation to the $J/\psi -$proton interaction. These measurements of $J/\psi$ photoproduction near threshold are also crucial inputs to theoretical models that are used to study important aspects of the gluon structure of the proton, such as the gluon Generalized Parton Distribution (GPD) of the proton, the mass radius of the proton, and the trace anomaly contribution to the proton mass. We observe possible structures in the total cross section energy dependence and find evidence for contributions beyond gluon exchange in the differential cross section close to threshold, both of which are consistent with contributions from open-charm intermediate states.

   nucl-exhep-exPRC(2023)·121 citations
2. 02*

   PVEMC: Isolating the flavor-dependent EMC effect using parity-violating inelastic scattering in SoLID

   Rakitha Beminiwattha🇺🇸 · John Arrington🇺🇸 · David J. Gaskell🇺🇸

   In order to better understand the EMC effect, we propose a clean and precise measurement of the flavor dependence of the EMC effect using parity-violating deep inelastic scattering on a ${}^{48}$Ca target. This measurement will provide an extremely sensitive test for flavor dependence in the modification of nuclear parton distribution functions (PDFs) for neutron-rich nuclei. A measurement of the flavor dependence will provide new and vital information and help to explain nucleon modification at the quark level. In addition to helping understand the origin of the EMC effect, a flavor-dependent nuclear pdf modification could significantly impact a range of processes, including neutrino-nucleus scattering, nuclear Drell-Yan processes, and e-A observables at the Electron-Ion Collider. The parity-violating asymmetry APV from ${}^{48}$Ca using an 11 GeV beam at $80\mu A$ will be measured using the SoLID detector in its PVDIS configuration. In 68 days of data taking, we will reach $0.7-1.3\%$ statistical precision for $0.2<x<0.7$ with $0.6-0.7\%$ systematic uncertainties. The goal is to make the first direct measurement of the flavor dependence of the EMC effect. The precision of the measurement will allow for quantification of the flavor-dependent effects, greatly improving our ability to differentiate between models of the EMC effect and constraining the u- and d-quark contributions in neutron rich nuclei.

   nucl-exEPJA(2023)·5 citations
3. 03*

   Towards $ab$-$initio$ nuclear theory calculations of ${\delta }_{\mathrm{C}}$

   Chien-Yeah Seng🇺🇸 · Mikhail Gorchtein🇩🇪

   We propose a new theory framework to study the isospin-symmetry breaking correction ${\delta }_{\text{C}}$ in superallowed nuclear beta decays, crucial for the precise determination of $|V_{ud}|$. Based on a general assumptions of the isovector dominance in ISB interactions, we construct a set of functions $F_{T_z}$ which involve nuclear matrix elements of isovector monopole operators and the nuclear Green's function. Via the functions $F_{T_z}$, a connection of ${\delta }_{\text{C}}$ to measurable electroweak nuclear radii is established, providing an experimental gauge of the theory accuracy of ${\delta }_{\text{C}}$. We outline a strategy to perform ab-initio calculations of $F_{T_z}$ based on the Lanczos algorithm, and discuss its similarity with other nuclear-structure-dependent inputs in nuclear beta decays.

   ↳ nucl-thhep-exhep-lathep-ph+1PRC(2024)·20 citations
4. 04*

   On the possibility of testing the two-peak structure of the LHCb hidden-charm strange pentaquark $P_{cs}(4459{)}^0$ in near-threshold antikaon-induced charmonium production on protons and nuclei

   E.Ya.Paryev🇷🇺

   Accounting for the LHCb observation that the reported hidden-charm strange pentaquark $P_{cs}(4459{)}^0$ can split into two substructures, $P_{cs}(4455{)}^0$ and $P_{cs}(4468{)}^0$, with a mass difference of 13 MeV as well as the newly observed hidden-charm pentaquark resonance $P_{cs}(4338{)}^0$ with strangeness, we study within the double-peak scenario for the $P_{cs}(4459{)}^0$ state the near-threshold $J/\psi$ meson production from protons and nuclei by considering incoherent direct non-resonant ($K^{-}p\to J/\psi \Lambda$) and two-step resonant ($K^{-}p\to P_{csi}^0\to J/\psi \Lambda$, $i=1$, 2, 3; $P_{cs1}^0=P_{cs}(4338{)}^0$, $P_{cs2}^0=P_{cs}(4455{)}^0$, $P_{cs3}^0=P_{cs}(4468{)}^0$) charmonium production processes with the main goal of clarifying the possibility to observe within this scenario both above two substructures contributing to the $P_{cs}(4459{)}^0$ state and the $P_{cs}(4338{)}^0$ resonance in this production. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of $J/\psi$ mesons on protons as well as on carbon and tungsten target nuclei at near-threshold incident antikaon beam momenta by assuming the spin-parity assignments of the hidden-charm resonances $P_{cs}(4338{)}^0$, $P_{cs}(4455{)}^0$ and $P_{cs}(4468{)}^0$ as $J^P=(1/2{)}^{-}$, $J^P=(1/2{)}^{-}$ and $J^P=(3/2{)}^{-}$ within four different realistic choices for the branching ratios of their decays to the $J/\psi \Lambda$ mode (0.125, 0.25, 0.5 and 1\%) as well as for two options for the branching fraction of their decays to the $K^{-}p$ channel (0.01 and 0.001\%). We show that these combined observables reveal clear sensitivity to these scenarios. Hence, they may be an important tool to provide further evidence for the existence of the above strange hidden-charm pentaquark resonances.

   ↳ hep-phhep-exnucl-exNPA(2023)·9 citations
5. 05*

   Systematic study of bremsstrahlung emission in reactions with light nuclei in cluster models

   S. P. Maydanyuk (1 and 2)🇭🇺 · V. S. Vasilevsky (3) ((1) Wigner Research Centre for Physics, Budapest, Hungary, (2) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine, (3) Bogolyubov Institute for Theoretical Physics, Kyiv, Ukraine)🇺🇦

   A new model of bremsstrahlung emission in the scattering of light nuclei is constructed with main focus on strict cluster formulation of nuclear processes. Analysis is performed in frameworks of the folding approximation of the formalism with participation of $s$-nuclei. Reactions $p$ +${}^4$He, ${}^2$D + ${}^4$He, ${}^3$H + ${}^4$He, ${}^3$He + ${}^4$He are included to analysis. Systematic analysis of properties of emission of bremsstrahlung photons in the wide region of kinetic energy of relative motion of two nuclei from 7 to 1000~MeV is performed. Influence of the oscillator length on the calculated spectra of bremsstrahlung emission is analyzed. On the example of ${}^3$H + ${}^4$He, dependence of the bremsstrahlung spectra on parameters of nuclear component of interacting potential is established (at first time for the light nuclei). Experimental bremsstrahlung data for the proton-deuteron scattering and proton-$\alpha$-particle scattering are analyzed on the basis of this model.

   ↳ nucl-thhep-phnucl-exPRC(2023)·8 citations
6. 06*

   Rotation and vibration in tetraquarks

   Amir Jalili🇵🇱 · Jorge Segovia🇪🇸 · Feng Pan🇨🇳 · Yan-An Luo🇨🇳

   A novel approach is introduced for obtaining precise solutions of the pairing Hamiltonian for tetraquarks, which utilizes an algebraic technique in infinite dimensions. The parameters involved in the transition phase are calibrated based on potential tetraquark candidates derived from phenomenology. Our investigation shows that the rotation and vibration transitional theory delivers a more accurate explanation for heavy tetraquarks compared to other methods utilizing the same formalism. To illustrate the concept, we compute the spectra of several tetraquarks, namely charm, bottom, bottom-charm and open charm and bottom systems, and contrast them with those of other particles.

   ↳ hep-phhep-exhep-latnucl-ex+1Few Body Syst.(2023)·3 citations
7. 07*

   Twelve-crystal prototype of Li${}_2$MoO${}_4$ scintillating bolometers for CUPID and CROSS experiments

   CUPID · CROSS collaborations: K. Alfonso · A. Armatol · C. Augier · F.T. Avignone III · O. Azzolini · M. Balata · I.C. Bandac · A.S. Barabash · G. Bari · A. Barresi · D. Baudin and 171 other authors

   An array of twelve 0.28 kg lithium molybdate (LMO) low-temperature bolometers equipped with 16 bolometric Ge light detectors, aiming at optimization of detector structure for CROSS and CUPID double-beta decay experiments, was constructed and tested in a low-background pulse-tube-based cryostat at the Canfranc underground laboratory in Spain. Performance of the scintillating bolometers was studied depending on the size of phonon NTD-Ge sensors glued to both LMO and Ge absorbers, shape of the Ge light detectors (circular vs. square, from two suppliers), in different light collection conditions (with and without reflector, with aluminum coated LMO crystal surface). The scintillating bolometer array was operated over 8 months in the low-background conditions that allowed to probe a very low, $\mu$Bq/kg, level of the LMO crystals radioactive contamination by ${}^{228}$Th and ${}^{226}$Ra.

   ↳ physics.ins-detnucl-exJINST(2023)·18 citations
8. 08*

   A first test of CUPID prototypal light detectors with NTD-Ge sensors in a pulse-tube cryostat

   CUPID collaboration: K. Alfonso🇺🇸 · A. Armatol🇫🇷 · C. Augier🇫🇷 · F.T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · M. Balata🇮🇹 · A.S. Barabash🇷🇺 · G. Bari🇮🇹 · A. Barresi🇮🇹 · D. Baudin🇫🇷 · F. Bellini🇮🇹 · G. Benato🇮🇹 and 166 other authors

   CUPID is a next-generation bolometric experiment aiming at searching for neutrinoless double-beta decay with ~250 kg of isotopic mass of ${}^{100}$Mo. It will operate at $\sim$10 mK in a cryostat currently hosting a similar-scale bolometric array for the CUORE experiment at the Gran Sasso National Laboratory (Italy). CUPID will be based on large-volume scintillating bolometers consisting of ${}^{100}$Mo-enriched Li${}_2$MoO${}_4$ crystals, facing thin Ge-wafer-based bolometric light detectors. In the CUPID design, the detector structure is novel and needs to be validated. In particular, the CUORE cryostat presents a high level of mechanical vibrations due to the use of pulse tubes and the effect of vibrations on the detector performance must be investigated. In this paper we report the first test of the CUPID-design bolometric light detectors with NTD-Ge sensors in a dilution refrigerator equipped with a pulse tube in an above-ground lab. Light detectors are characterized in terms of sensitivity, energy resolution, pulse time constants, and noise power spectrum. Despite the challenging noisy environment due to pulse-tube-induced vibrations, we demonstrate that all the four tested light detectors comply with the CUPID goal in terms of intrinsic energy resolution of 100 eV RMS baseline noise. Indeed, we have measured 70--90 eV RMS for the four devices, which show an excellent reproducibility. We have also obtained outstanding energy resolutions at the 356 keV line from a ${}^{133}$Ba source with one light detector achieving 0.71(5) keV FWHM, which is -- to our knowledge -- the best ever obtained when compared to $\gamma$ detectors of any technology in this energy range.

   ↳ physics.ins-detnucl-exJINST(2023)·12 citations
9. 09*

   Instruction of my personal computing library

   Tomohiro Oishi🇯🇵

   This document is prepared to introduce and explain how to use the computing library composed by T. Oishi. The library-01 TOSPEM solves, for the spherical nucleus, (i) the Schroedinger equation for the single-nucleon states within the Woods-Saxon potential, (ii-a) the electric or magnetic transition strength, B(EJ) or B(MJ), between the arbitrary set of initial and final states of the nucleus of interest, and (ii-b) Weisskopf estimate for comparison with results in (ii-a). The library-02 RESONA is composed to solve the resonant eigenstates of spherical Schroedinger equations. The final version is expected to be published for educational and commercial purposes. Before the official publication, under the agreement with publishers, I make the current, preliminary version open for public. Two applications, GFORTRAN and GNUPLOT, are necessary for full usage. Feedbacks and comments on products will be appreciated. The source codes etc. are available in the GitHub repository [1].

   ↳ nucl-thnucl-exquant-ph0 citations
10. 10*

    In-situ quantification of gamma-ray and beta-only emitting radionuclides

    Kai Vetter · Donald Gunter · Paul Luke🇺🇸 · Victor Negut · Ryan Pavlovsky · Brian Plimley · Joanna Szornel

    The prompt and in-situ assessment of non-gamma ray emitting radionuclides such as Sr-90 remains an outstanding challenge, particularly in radiological emergency response and consequence management situations. We have developed a new concept to quantitatively assess a wide range of radionuclides, including beta-only emitters, using coplanar-grid CdZnTe detectors that provide depth-of-interaction sensing. By combining measurements with and without an electron absorber, we demonstrate the feasibility of detecting and identifying Sr-90 and other radionuclides with a sensitivity of about 1 $\mu$Ci/m${}^2$ or 3.7x10${}^4$ Bq/m${}^2$, which is 10\% of the Derived Response Level, in less than 60 minutes. The new compact instrument can be used in the field or mobile laboratories to quickly assess a wide range of samples with sufficient sensitivity and specificity to provide critical guidance in the response after radiological incidents.

    ↳ physics.ins-detnucl-ex0 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.