Quantitative evaluation of ultracold neutron production and storage in superfluid helium

Authors
Abe, Y Morishima, N
Citation
Y. Abe et N. Morishima, Quantitative evaluation of ultracold neutron production and storage in superfluid helium, NUCL INST A, 463(1-2), 2001, pp. 293-298
Citations number
19
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
463
Issue
1-2
Year of publication
2001
Pages
293 - 298
Database
ISI
SICI code
0168-9002(20010501)463:1-2<293:QEOUNP>2.0.ZU;2-8
Abstract
The production of ultracold neutron (UCN) in superfluid He-4 is evaluated b y use of the scattering cross-section model of liquid 4He developed by the authors in a wide range of temperatures from 0.1 to 4.2 K and neutron energ ies from 0.1 mu eV to 10 eV. Typical results on the total cross section and angular distribution of UCN production are presented. The UCN density atta inable in liquid 4He is estimated and found to exhibit saturation behavior at lower temperatures. It is shown that 1 meV neutrons serve for the UCN pr oduction effectively and that the UCN density reaches the maximum of 4.2 x 10(4) cm(-3) below about 0.5 K where no significant up-scattering of UCN oc curs and a UCN disappears only by neutron P-decay. (C) 2001 Elsevier Scienc e B.V. All rights reserved.