Mon·Mar 4, 2019Monday·March 4, 2019

1. 01*

   Nuclear Gamma Radiation Caused by a Muon at Rest in 152Sm

   Victor Abazov · Victor Gordeev · Kornelia Grama · Sergej Kutuzov · Do Khoang Kyong · Miroslav Lewandowski · Basar Sabirov · Georgij Solyakin

   Investigation of the interaction of muons with complex nuclei yields important results on the properties of nuclei and on their electromagnetic interaction with muons happening to be in the Coulomb field of the nucleus. The muon serves as a unique instrument in studies of the charge distribution and of other properties of nuclei. The following are processes which yield information relevant to the properties of nuclei. This work is the first (and unique) investigation of the dynamic E0 excitation of nucleus at muon - decay on the K-orbit of muonic atom.This excitation mechanism permits one to get per se nuclear monopole excitation. Study of nuclear excitation by the decay of the bound muon is of independent interest - discovery of a new process and validation of ideas about it in the future can provide a new complementary method for studying nuclear monopole states.

   nucl-exPhys.Part.Nucl.(2020)·1 citation
2. 02*

   Technique for Surface Background Rejection in Liquid Argon Dark Matter Detectors using Layered Wavelength-Shifting and Scintillating Thin Films

   M.G. Boulay🇨🇦 · M. Kuźniak🇨🇦

   A technique using layered wavelength shifting, scintillating and non-scintillating films is presented to achieve discrimination of surface $\alpha$ events from low-energy nuclear recoils in liquid argon detectors. A discrimination power greater than $10^8$, similar to the discrimination possible for electronic recoils in argon, can be achieved by adding a 50 micron layer of scintillator with a suitably slow decay time, approximately 300 ns or greater, to a wavelength-shifter coated surface. The technique would allow suppression of surface $\alpha$ events in a very large next-generation argon dark matter experiment (with hundreds of square meters of surface area) without the requirement for position reconstruction, thus allowing utilization of more of the instrumented mass in the dark matter search. The technique could also be used to suppress surface backgrounds in compact argon detectors of low-energy nuclear recoils, for example in measurements of coherent neutrino-nucleus scattering or for sensitive measurements of neutron fluxes.

   ↳ physics.ins-detastro-ph.IMnucl-exNucl.Instrum.Meth.A(2020)·6 citations
3. 03*

   The energy-momentum tensor of spin-1 hadrons: formalism

   Wim Cosyn🇧🇪 · Sabrina Cotogno🇫🇷 · Adam Freese🇺🇸 · Cédric Lorcé🇫🇷

   We provide the complete decomposition of the local gauge-invariant energy-momentum tensor for spin-1 hadrons, including non-conserved terms for the individual parton flavors and antisymmetric contributions originating from intrinsic spin. We state sum rules for the gravitational form factors appearing in this decomposition and provide relations for the mass decomposition, work balance, total and orbital angular momentum, mass radius, and inertia tensor. Generalizing earlier work, we derive relations between the total and orbital angular momentum and the Mellin moments of twist-2 and 3 generalized parton distributions, accessible in hard exclusive processes with spin-1 targets. Throughout the work, we comment on the unique features in these relations originating from the spin-1 nature of the hadron, being absent in the lower spin cases.

   ↳ hep-phnucl-exnucl-thEPJC(2019)·66 citations
4. 04*

   Detection of atomic nuclear reaction products via optical imaging

   Benjamin Loseth · Ruoyu Fang · Dustin Frisbie · Kristen Parzuchowski · Claudio Ugalde · Jennifer Wenzl · Jaideep Taggart Singh🇺🇸

   In this paper we propose a new method for measuring the cross section of low yield nuclear reactions by capturing the products in a cryogenically frozen noble gas solid. Once embedded in the noble gas solid, which is optically transparent, the product atoms can be selectively identified by laser induced fluorescence and individually counted via optical imaging to determine the cross section. Single atom sensitivity by optical imaging is feasible because the surrounding lattice of noble gas atoms facilitates a large wavelength shift between the excitation and emission spectrum of the product atoms. The tools and techniques from the fields of single molecule spectroscopy and superresolution imaging in combination with an electromagnetic recoil separator, for beam and isotopic differentiation, allow for a detection scheme with near unity efficiency, a high degree of selectivity, and single atom sensitivity. This technique could be used to determine a number of astrophysically important nuclear reaction rates.

   ↳ physics.ins-detnucl-exPRC(2019)·3 citations
5. 05*

   Note on neutron star equation of state in the light of GW170817

   Ang Li🇨🇳 · Zhen-Yu Zhu🇨🇳

   From the very first multimessenger event of GW170817, clean robust constraints can be obtained for the tidal deformabilities of the two stars involved in the merger, which provides us unique opportunity to study the equation of states (EOSs) of dense stellar matter. In this contribution, we employ a model from the quark level, describing consistently a nucleon and many-body nucleonic system from a quark potential. We check that our sets of EOSs are consistent with available experimental and observational constraints at both sub-nuclear saturation densities and higher densities. The agreements with ab-initio calculations are also good. Especially, we tune the density dependence of the symmetry energy (characterized by its slope at nuclear saturation $L$) and study its influence on the tidal deformability. The so-called $QMF18$ EOS is named after the case of $L=40\mathrm{MeV}$, and it gives $M_{\mathrm{TOV}}=2.08M_{\odot }$ and $R=11.77\mathrm{km}$, $\Lambda =331$ for a $1.4M_{\odot }$ star. The tidal signals are demonstrated to be insensitive to the uncertain crust-core matching, despite the good correlation between the symmetry energy slope and the radius of the star.

   ↳ nucl-thastro-ph.HEastro-ph.SRnucl-exAIP Conf.Proc.(2019)·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.