Author :
Lee, J.H. ; Bhang, H. ; Choi, Jun H. ; Kang, W.G. ; Kim, Byung H. ; Kim, H.J. ; Kim, Kwan Weon ; Kim, Scott C. ; Kim, Soo Kyung ; Kim, Y.D. ; Lee, J.I. ; Lee, Jung Keun ; Lee, M.J. ; Lee, S.J. ; Li, Jie ; Li, Jie ; Li, X. Rong ; Li, Yue Juan ; Myung, S.S.
Author_Institution :
Dept. of Phys. & Astron., Seoul Nat. Univ., Seoul, South Korea
Abstract :
In order to understand the scintillation characteristics of nuclear recoil events in CsI(Tl) crystals and for application to the analysis of Dark Matter (DM) searches, we study quenching and channeling effects with simulations of recoil ion motion in CsI(Tl) and experiments using neutrons impinging on the crystal. The electronic energy loss versus penetration depth of recoil ions in a CsI(Tl) target are simulated by the SRIM and MARLOWE programs and modified by the application of a measured scintillation efficiency function. They are used to produce quenching factors as a function of recoil energy. The application of the MARLOWE code to a monocrystalline target yields a light yield distribution including tails which are correlated with ions´ enhanced ranges. The 2.4 MeV pulsed neutrons impinging on a monocrystalline CsI(Tl) target and an array of neutron detectors located at different scattering angles are used to measure the light yield distribution and the status of the measurement is reported.
Keywords :
dark matter; hypothetical particles; ion microprobe analysis; neutron detection; nuclear chemical analysis; scintillation counters; CsI(Tl) crystals; CsI(Tl) target; MARLOWE program; SRIM program; WIMP; channeling effects; dark matter search; electron volt energy 2.4 MeV; electronic energy loss; light yield distribution; monocrystalline target yields; neutron detectors; nuclear recoil events; penetration depth; quenching; recoil ion motion; scintillation characteristics; scintillation efficiency function; weakly interacting massive particles; Atmospheric measurements; Crystals; Energy loss; Ions; Kinetic energy; Particle measurements; Channeling effect; CsI(Tl); MARLOWE; SRIM; WIMPs; nuclear recoil; quenching factor; scintillation; stopping power;
