Measurement of temperature of neutrons emanating from H₂O ice moderator at 77 K

Article type: Research Article

Authors: Das, Ramkrishna | Basu, Saibal | Shaikh, Akhtar Mehboob

Affiliations: Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

Note: [] Corresponding author. Email: rdas@barc.gov.in

Note: [] Email: sbasu@barc.gov.in

Note: [] Email: shaikham@barc.gov.in

Abstract: The present study concentrates on the measurement of gain in the flux of cold neutrons emanating from an H2O ice moderator when it is cooled from ambient to a cryogenic temperature. The temperature of neutrons when the moderator is at cryogenic temperature has been determined from this gain. The integrated cold neutron flux is obtained by using a polycrystalline beryllium low pass filter in the path of a scattered neutron beam. A gain of about 7 in the cold neutron flux and a neutron temperature of about 100 K have been obtained when the temperature of water ice was reduced to 77 K.

Keywords: Cold neutron source, Moderator, Water, Neutron temperature

DOI: 10.1080/10238160802583372

Journal: Journal of Neutron Research, vol. 16, no. 1, 2, pp. 55-60, 2008