Author:
Ha D.H.,Kim G.W.,Kim H.J.,Kim J.H.,Kim Y.D.,Lee E.K.,Lee J.,Nyanda P.B.,Park H.,Park S.Y.,Sari M.B.,Seo J.W.,Yi E.S.,Yoon Y.S.
Abstract
Abstract
The second phase of the Advanced Mo-based Rare process
Experiment (AMoRE-II) searches for a neutrino-less double-beta decay
of 100Mo. A background level in the region of interest of
3034 ± 10 keV is required to be lower than 10-4 count/(keV
kg year). Neutrons can generate background signals by gamma-ray
emitting reactions with AMoRE-II detector materials. Thermal neutron
shields will be installed inside and outside the lead shield to
reduce the neutron flux in the shielding system. The background
radioactivity of the inner thermal neutron shield must be low
because AMoRE-II requires a low background level. A thermal neutron
shield with a high shielding efficiency and low radioactivity was
produced by using boric acid powder and silicone rubber. The
shielding efficiency was tested to be
{99.2 ± 0.25(stat)-0.53
+0.47(syst)}%, and
the radioactivities of 40K, 226Ra, 228Ac, and
228Th were measured to be < 9.2 at 90% C.L., 14.2 ± 1.5,
< 1.6 at 90% C.L., and 2.83 ± 0.80 mBq/kg, respectively.
Subject
Mathematical Physics,Instrumentation
Cited by
1 articles.
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