Wed·Jan 16, 2019Wednesday·January 16, 2019

1. 01*

   A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II

   M. M. Lowry🇺🇸 · C. D. Bass🇺🇸 · A. D'Angelo🇮🇹 · A. Deur🇺🇸 · G. Dezern🇺🇸 · C. Hanretty🇺🇸 · D. Ho🇺🇸 · T. Kageya🇺🇸 · D. Kashy🇺🇸 · M. Khandaker🇺🇸 · V. Laine🇺🇸 · T. O'Connell🇺🇸 and 6 other authors

   The design, fabrication, operation, and performance of a helium-3/4 dilution refrigerator and superconducting magnet system for holding a frozen-spin polarized hydrogen deuteride target in the Jefferson Laboratory CLAS detector during photon beam running is reported. The device operates both vertically (for target loading) and horizontally (for target bombardment). The device proves capable of maintaining a base temperature of 50 mK and a holding field of 1 Tesla for extended periods. These characteristics enabled multi-month polarization lifetimes for frozen spin HD targets having proton polarization of up to 50% and deuteron up to 27%.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2016)·13 citations
2. 02*

   Sensitivity to sterile neutrino mixing using reactor antineutrinos

   S. P. Behera🇮🇳 · D. K. Mishra🇮🇳 · L. M. Pant🇮🇳

   The reactor antineutrinos are used for the precise measurement of oscillation parameters in the 3-neutrino model, and also used to investigate active-sterile neutrino mixing sensitivity in the 3$+$1 neutrino framework. In the present work, we study the feasibility of sterile neutrino search with the Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up using electron antineutrinos (${\overline{\nu }}_e$) produced from reactor as a source. The so-called 3$+$1 scenario is considered for active-sterile neutrino mixing, which leads to projected exclusion curves in the sterile neutrino mass and mixing angle plane. The analysis is performed considering both the reactor and detector related parameters. It is found that, the ISMRAN set-up can observe the active-sterile neutrino mixing sensitivity for ${\sin }^{2}2{\theta }_{14}\ge$ 0.064 and $\Delta m_{41}^2$ = 1.0 eV${}^2$ at 90$\%$ confidence level for an exposure of 1 ton-year by using neutrinos produced from the DHRUVA reactor with thermal power of 100 MW${}_{th}$. It is also observed that, there is a significant improvement of the active-sterile neutrino mixing parameter ${\sin }^{2}2{\theta }_{14}$ to $\sim$ 0.03 at the same $\Delta m_{41}^2$ by putting the ISMRAN detector set-up at a distance of 20 m from the compact proto-type fast breeder reactor (PFBR) facility with thermal power of 1250 MW${}_{th}$.

   ↳ hep-phnucl-exnucl-thEPJC(2019)·8 citations
3. 03*

   Quantum Monte Carlo Methods in Nuclear Physics: Recent Advances

   J. E. Lynn🇩🇪 · I. Tews🇺🇸 · S. Gandolfi🇺🇸 · A. Lovato🇮🇹

   In recent years, the combination of precise quantum Monte Carlo (QMC) methods with realistic nuclear interactions and consistent electroweak currents, in particular those constructed within effective field theories (EFTs), has lead to new insights in light and medium-mass nuclei, neutron matter, and electroweak reactions. This compelling new body of work has been made possible both by advances in QMC methods for nuclear physics, which push the bounds of applicability to heavier nuclei and to asymmetric nuclear matter and by the development of local chiral EFT interactions up to next-to-next-to-leading order and minimally nonlocal interactions including $\Delta$ degrees of freedom. In this review, we discuss these recent developments and give an overview of the exciting results for nuclei, neutron matter and neutron stars, and electroweak reactions.

   ↳ nucl-thnucl-exAnn.Rev.Nucl.Part.Sci.(2019)·128 citations
4. 04*

   Time resolution studies for scintillating plastics coupled to silicon photo-multipliers

   Mauricio Alvarado🇲🇽 · Alejandro Ayala🇲🇽 · Marco Alberto Ayala-Torres🇲🇽 · Wolfgang Bietenholz🇲🇽 · Isabel Dominguez🇲🇽 · Marcos Fontaine🇲🇽 · P. González-Zamora🇲🇽 · Luis Manuel Montaño🇲🇽 · E. Moreno Barbosa🇲🇽 · Miguel Enrique Patiño Salazar🇲🇽 · V. Z. Reyna Ortiz🇲🇽 · M. Rodríguez Cahuantzi🇲🇽 and 4 other authors

   We present results for time resolution studies performed on three different scintillating plastics and two silicon photo-multipliers. These studies are intended to determine whether scintillating plastic/silicon photo-multiplier systems can be employed to provide a fast trigger signal for NICA's Multi Purpose Detector (MPD). Our results show that such a system made of cells with transverse dimensions of order of a few cm, coupled to silicon photo-multipliers, provides a time resolution of about 50 ps, which can be even further improved to attain the MPD trigger requirements of 20 ps.

   ↳ physics.ins-dethep-exnucl-ex2 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.