Issue |
EPL
Volume 96, Number 6, December 2011
|
|
---|---|---|
Article Number | 62001 | |
Number of page(s) | 5 | |
Section | Nuclear Physics | |
DOI | https://doi.org/10.1209/0295-5075/96/62001 | |
Published online | 01 December 2011 |
Production of ultra-cold neutrons in solid α-oxygen
1
Technische Universität München, Physik Department - James-Franck-Str. 1, D-85748 Garching, Germany, EU
2
Institut Laue Langevin - 156X, F-38042 Grenoble CEDEX, France, EU
3
Dipartimento di Fisica and CNR-IOM, Università di Perugia - I-06123 Perugia, Italy, EU
a
egutsmie@e18.physik.tu-muenchen.de
Received:
6
April
2011
Accepted:
26
October
2011
Our recent neutron scattering measurements of phonons and magnons in solid α-oxygen have led us to a new understanding of the production mechanism of ultra-cold neutrons (UCN) in this super-thermal converter. The UCN production in solid α-oxygen is dominated by the excitation of phonons. The contribution of magnons to UCN production becomes only slightly important above E>10 meV and at E∼4 meV. Solid α-oxygen is in comparison to solid deuterium less efficient in the down-scattering of thermal or cold neutrons into the UCN energy regime. Nevertheless, the lower efficiency might be compensated by the larger mean free-path of UCN in oxygen with respect to deuterium.
PACS: 28.20.Cz – Neutron scattering / 75.50.Ee – Antiferromagnetics
© EPLA, 2011
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