Tue·Feb 22, 2022Tuesday·February 22, 2022

1. 01*

   SIDIS Measurement with A=3 Nuclei

   Zhihong Ye🇨🇳 · Dipangkar Dutta🇺🇸 · Dave Gaskell🇺🇸 · Or Hen🇺🇸 · Dave Meekins🇺🇸 · Dien Nguyen🇺🇸 · Jennifer Rittenhouse West🇺🇸 · Lawrence Weinstein🇺🇸

   We introduce a new experimental effort at Jefferson Lab (JLab) to precisely measure the ratios of charged pion electroproduction in Semi-Inclusive Deep Inelastic Scattering (SIDIS) from ${}^2$D, ${}^3$He, and ${}^3$H targets \cite{c12-21-004}. This conditionally approved experiment (C12-21-004) aims to run in Hall-B using the standard CLAS12 configuration and a new target system developed for the approved quasi-elastic experiment (E12-20-005). In this data-driven study, we will measure the cross-sections as a function of ($x$, $Q^2$, $z$, $P_T$) to allow the extraction of the unpolarized parton distribution functions (PDFs), transverse momentum distributions (TMDs) and fragmentation functions (FFs) in A = 3 nuclei. By using super-ratios of pion yields of SIDIS off light nuclei over a wide $x_B$ range, we search for evidence of a flavor dependence in the EMC effect, giving us new insights into the effect of the nuclear environment on valance quarks. Double-ratios between A = 3 mirror nuclei can provide a direct measurement of the d/u ratios at large x due to their similar and well-understood nuclear corrections. With the utilization of mirror nuclei and the large kinematic range, and high precision of CLAS12, we will be able to maintain the sensitivity to the underlying physics but dramatically decrease the nuclear uncertainties due to attenuation and hadronization in heavy nuclei targets.

   nucl-exhep-ph0 citations
2. 02*

   Measurement of Coherent Elastic Neutrino-Nucleus Scattering from reactor antineutrinos

   J. Colaresi🇫🇷 · J.I. Collar🇺🇸 · T.W. Hossbach🇺🇸 · C.M. Lewis🇺🇸 · K.M. Yocum🇫🇷

   The 96.4 day exposure of a 3 kg ultra-low noise germanium detector to the high flux of antineutrinos from a power nuclear reactor is described. A very strong preference ($p<1.2\times 10^{-3}$) for the presence of a coherent elastic neutrino-nucleus scattering (CE$\nu$NS) component in the data is found, when compared to a background-only model. No such effect is visible in 25 days of operation during reactor outages. The best-fit CE$\nu$NS signal is in good agreement with expectations based on a recent characterization of germanium response to sub-keV nuclear recoils. Deviations of order 60\% from the Standard Model CE$\nu$NS prediction can be excluded using present data. Standing uncertainties in models of germanium quenching factor, neutrino energy spectrum, and background are examined.

   ↳ hep-exhep-phnucl-exPRL(2022)·137 citations
3. 03*

   Optical, luminescence, and scintillation properties of advanced ZnWO${}_4$ crystal scintillators

   P. Belli🇮🇹 · R. Bernabei🇮🇹 · Yu.A. Borovlev🇷🇺 · F. Cappella🇮🇹 · V. Caracciolo🇮🇹 · R. Cerulli🇮🇹 · F.A. Danevich🇺🇦 · V.Ya. Degoda🇺🇦 · A. Incicchitti🇮🇹 · D.V. Kasperovych🇺🇦 · Ya.P. Kogut🇺🇦 · A. Leoncini🇮🇹 and 3 other authors

   Zinc tungstate (ZnWO${}_4$) crystal scintillators are promising detection material for the experiments searching for double beta decay, dark matter, and investigating rare alpha decays. An extended R&D was performed to develop advanced quality ZnWO${}_4$ crystal scintillators. The R&D programme included the selection of the initial materials, the variation of the compound stoichiometry, the application of single and double crystallization, and the annealing of the crystal boules. The optical transmittance of the produced boules was measured, and the luminescence under X-ray excitation in the temperature region from 85 K to room temperature was studied (thermally stimulated luminescence was measured till 350 K). The energy resolution and the relative scintillation pulse amplitude were measured with gamma-sources demonstrating high scintillation properties of the samples produced by single crystallization from deeply purified zinc and tungsten oxides, with stoichiometric composition, annealed in air atmosphere.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2022)·5 citations
4. 04*

   Benchmark calculations of infinite neutron matter with realistic two- and three-nucleon potentials

   A. Lovato🇺🇸 · I. Bombaci🇮🇹 · D. Logoteta🇮🇹 · M. Piarulli🇺🇸 · R. B. Wiringa🇺🇸

   We present the equation of state of infinite neutron matter as obtained from highly-realistic Hamiltonians that include nucleon-nucleon and three-nucleon coordinate-space potentials. We benchmark three independent many-body methods: Brueckner-Bethe-Goldstone (BBG), Fermi hypernetted chain/single-operator chain (FHNC/SOC), and auxiliary-field diffusion Monte Carlo (AFDMC). We find them to provide similar equations of state when the Argonne $v_{18}$ and the Argonne $v_6^{\prime }$ nucleon-nucleon potentials are used in combination with the Urbana IX three-body force. Only at densities larger than about 1.5 the nuclear saturation density (${\rho }_0=0.16{\mathrm{fm}}^{-3}$) the FHNC/SOC energies are appreciably lower than the other two approaches. The AFDMC calculations carried out with all of the Norfolk potentials fitted to reproduce the experimental trinucleon ground-state energies and $nd$ doublet scattering length yield unphysically bound neutron matter, associated with the formation of neutron droplets. Including tritium $\beta$-decay in the fitting procedure, as in the second family of Norfolk potentials, mitigates but does not completely resolve this problem. An excellent agreement between the BBG and AFDMC results is found for the subset of Norfolk interactions that do not make neutron-matter collapse, while the FHNC/SOC equations of state are moderately softer.

   ↳ nucl-thastro-ph.HEnucl-exPRC(2022)·48 citations
5. 05*

   Pion-induced radiative corrections to neutron beta-decay

   Vincenzo Cirigliano🇺🇸 · Jordy de Vries🇳🇱 · Leendert Hayen🇺🇸 · Emanuele Mereghetti🇺🇸 · André Walker-Loud🇺🇸

   We compute the electromagnetic corrections to neutron beta decay using a low-energy hadronic effective field theory. We identify and compute new radiative corrections arising from virtual pions that were missed in previous studies. The largest correction is a percent-level shift in the axial charge of the nucleon proportional to the electromagnetic part of the pion-mass splitting. Smaller corrections, comparable to anticipated experimental precision, impact the $\beta$-$\nu$ angular correlations and the $\beta$-asymmetry. We comment on implications of our results for the comparison of the experimentally measured axial charge with first-principle computations using lattice QCD and on the potential of $\beta$-decay experiments to constrain beyond-the-Standard-Model interactions.

   ↳ nucl-thhep-lathep-phnucl-exPRL(2022)·65 citations
6. 06*

   New constraints on the neutron-star mass and radius relation from terrestrial nuclear experiments

   Hajime Sotani🇯🇵 · Nobuya Nishimura🇯🇵 · Tomoya Naito🇯🇵

   The determination of the equation of state (EOS) for nuclear matter has been one of the biggest problems in nuclear astrophysics, because the EOS is essential for determining the properties of neutron stars. To constrain the density-dependence of the nuclear symmetry energy, several nuclear experiments, e.g., reported by the S$\pi$RIT and PREX-II collaborations, have recently been performed. However, since their uncertainties are still large, additional constraints such as astronomical observations must be crucial. In addition, it is interesting to see the effect of their reported value on neutron star properties. In this study, focusing on the relatively lower density region, we investigate the allowed area of the neutron-star mass and radius relation by assuming the constraints from S$\pi$RIT and PREX-II. Each region predicted by these experiments is still consistent with the allowed area constrained by the various astronomical observations. Our results show that terrestrial nuclear experiments must provide further constraints on the EOS for neutron stars, complementing astronomical observations.

   ↳ nucl-thastro-ph.HEnucl-exPTEP(2022)·31 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.