Experimental study of ultracold neutron production in pressurized superfluid helium
Name
Experimental study.pdf
Size
349.74 KB
Format
Adobe PDF
Checksum (MD5)
7e1c073c948cf435ff3adb417b4243c0
Author(s)
Schmidt-Wellenburg, P.
Bossy, J.
Farhi, E.
Fertl, M.
Leung, K. K. H.
Rahli, A.
Soldner, T.
Zimmer, O.
Farhi, Edward H
Date Issued
August 2015
Journal
Physical Review C
Publisher
American Physical Society
Citation
Schmidt-Wellenburg, P.; Bossy, J.; Farhi, E.; Fertl, M.; Leung, K. K. H.; Rahli, A.; Soldner, T. and Zimmer, O. “Experimental Study of Ultracold Neutron Production in Pressurized Superfluid Helium.” Physical Review C 92, no. 2 (August 2015): 024004. © 2015 American Physical Society
Version
Final published version
Abstract
We investigate experimentally the pressure dependence of the production of ultracold neutrons (UCNs) in superfluid helium in the range from saturated vapor pressure to 20 bar. A neutron velocity selector allows the separation of underlying single-phonon and multiphonon processes by varying the incident cold neutron (CN) wavelength in the range from 3.5 to 10 Å. The predicted pressure dependence of UCN production derived from inelastic neutron scattering data is confirmed for the single-phonon excitation. For multiphonon-based UCN production we found no significant dependence on pressure, whereas calculations from inelastic neutron scattering data predict an increase of 43(6)% at 20 bar relative to saturated vapor pressure. From our data we conclude that applying pressure to superfluid helium does not increase the overall UCN production rate at a typical CN guide.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevC.92.024004
