On the Design of a Cold Neutron Source

Non-destructive analysis of metals and alloys using prompt gamma activation analysis and complementary methods

“…This delivered much higher neutron flux at the instrument, while keeping the general gamma-ray and neutron background low, thereby the signal-to-background ratio became orders of magnitude better. The neutron flux could be further increased using cold neutron sources [63]. Nowadays, sophisticated focusing neutron guides allow to reach neutron fluxes up to 10 10 cm -2 s -1 .…”

“…Figure 13: transitions from the 12 C(n, ) 13 C (left) and 63 Cu(n, ) 64 Cu reaction (right), and the levels of carbon and copper [74].…”

Design and construction of a thermal neutron target for the RPI linac

“…Clark et al . [14] made optimization calculations for their mesitylene moderator using the cross section measured by Utsuro [13] and their own Monte Carlo computer code ; their optimal geometry was found to be a disk of 3.75 cm radius and 3.0 cm thick. Thus a thickness of 3 cm is a reasonable optimum.…”

“…2 the cold moderator was designed to be cooled by a cold finger connected to a cold head which is similar to the cooling method used by Clark et al . [14]. The cold moderator and finger were designed to be contained in an evacuated enclosure to reduce the heating losses by convection .…”

A test setup for the bead cryogenic neutron moderator of the IBR-2 reactor

“…Only hydrogenous (preferably, deuterium contain ing) materials, such as liquid hydrogen, methane, and propane, aromatic hydrocarbons, and water ice [3][4][5][6][7][8][9] are used with pulsed sources of fast neutrons as cryo genic moderator materials. The most famous neutron sources comprising cryogenic moderators are the FRM II (Germany), ILL (France), and IBR 2 (Rus sia) reactors and neutron sources based on the ISIS (Great Britain), SNS (United States), SINQ (Swit zerland), and other accelerators.…”