Abstract
A new type of solid-state detector for ultracold neutrons has been developed and confirmed to be applicable at 4.2 K. 6Li/Ti multilayers, in which the effective potential is compensated, were formed as a neutron converter by vacuum evaporation on the surface of a silicon-surface-barrier detector. The detector was tested using a cold-neutron beam, and the reaction products in 6+Li+n → α + t were clearly observed in the pulse-height spectrum with a detection efficiency of 0.28% for 4Å neutrons. This is consistent with the estimated value, and implies that ultracold neutrons can be detected with an efficiency of greater than 60%. The detector enables us to study the characteristics of ultracold neutrons in liquid helium, which is necessary to discuss the feasibility of an intense ultracold neutron source based on the superthermal method.
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