Fri·Mar 31, 2017Friday·March 31, 2017

1. 01*

   Measurements of the Total Cross section for Thermal Neutrons at PNS

   Longxiang Liu · Hongwei Wang🇨🇳 · Yugang Ma🇨🇳 · Xiguang Cao🇨🇳 · Xiangzhou Cai🇨🇳 · Jingen Chen · Guilin Zhang · Jianlong Han🇺🇸 · Guoqiang Zhang🇨🇳 · Jifeng Hu🇨🇳 · Xiaohe Wang · Wenjiang Li · Zhe Yan · Haijuan Fu

   In order to measure the total cross section for thermal neutrons, a photoneutron source (PNS, phase 1) has been developed for the acquisition of nuclear data for the Thorium Molten Salt Reactor (TMSR) at the Shanghai Institute of Applied Physics (SINAP). PNS is an electron LINAC pulsed neutron facility that uses the time-of-flight (TOF) technique. It records the neutron TOF and identifies neutrons and $\gamma$-rays by using a digital signal processing technique. The background is obtained by using a combination of employing 12.8 cm boron-loaded polyethylene(PEB) (5$\%$ w.t.) to block the flight path and Monte Carlo methods. The neutron total cross sections of natural beryllium are measured in the neutron energy region from 0.007 to 0.1 eV. The present measurement result is compared with the fold Harvey data with the response function of PNS.

   nucl-exphysics.ins-det0 citations
2. 02*

   Indirect searches of Galactic diffuse dark matter in INO-MagICAL detector

   Amina Khatun🇮🇳 · Ranjan Laha🇺🇸 · Sanjib Kumar Agarwalla🇮🇳

   The signatures for the existence of dark matter are revealed only through its gravitational interaction. Theoretical arguments support that the Weakly Interacting Massive Particle (WIMP) can be a class of dark matter and it can annihilate and/or decay to Standard Model particles, among which neutrino is a favorable candidate. We show that the proposed 50 kt Magnetized Iron CALorimeter (MagICAL) detector under the India-based Neutrino Observatory (INO) project can play an important role in the indirect searches of Galactic diffuse dark matter in the neutrino and antineutrino mode separately. We present the sensitivity of 500 kt$\cdot$yr MagICAL detector to set limits on the velocity-averaged self-annihilation cross-section ($⟨\sigma v⟩$) and decay lifetime ($\tau$) of dark matter having mass in the range of 2 GeV $\le m_{\chi }\le$ 90 GeV and 4 GeV $\le m_{\chi }\le$ 180 GeV respectively, assuming no excess over the conventional atmospheric neutrino and antineutrino fluxes at the INO site. Our limits for low mass dark matter constrain the parameter space which has not been explored before. We show that MagICAL will be able to set competitive constraints, $⟨\sigma v⟩\le 1.87\times 10^{-24}$ cm${}^3$ s${}^{-1}$ for $\chi \chi \to \nu \bar{\nu }$ and $\tau \ge 4.8\times 10^{24}$ s for $\chi \to \nu \bar{\nu }$ at 90$\%$ C.L. (1 d.o.f.) for $m_{\chi }$ = 10 GeV assuming the NFW as dark matter density profile.

   ↳ hep-phastro-ph.GAastro-ph.HEhep-ex+1JHEP(2017)·12 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.