Experimental study of ultracold neutron production in pressurized superfluid helium
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 incid...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/108366 https://orcid.org/0000-0002-7309-8489 |
| _version_ | 1826189779229736960 |
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| author | Schmidt-Wellenburg, P. Bossy, J. Farhi, E. Fertl, M. Leung, K. K. H. Rahli, A. Soldner, T. Zimmer, O. Farhi, Edward H |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Schmidt-Wellenburg, P. Bossy, J. Farhi, E. Fertl, M. Leung, K. K. H. Rahli, A. Soldner, T. Zimmer, O. Farhi, Edward H |
| author_sort | Schmidt-Wellenburg, P. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:21:31Z |
| format | Article |
| id | mit-1721.1/108366 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:21:31Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1083662022-09-23T12:30:00Z Experimental study of ultracold neutron production in pressurized superfluid helium Schmidt-Wellenburg, P. Bossy, J. Farhi, E. Fertl, M. Leung, K. K. H. Rahli, A. Soldner, T. Zimmer, O. Farhi, Edward H Massachusetts Institute of Technology. Department of Physics Farhi, Edward H 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. 2017-04-21T19:51:48Z 2017-04-21T19:51:48Z 2015-08 Article http://purl.org/eprint/type/JournalArticle 0556-2813 1089-490X http://hdl.handle.net/1721.1/108366 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 https://orcid.org/0000-0002-7309-8489 en_US http://dx.doi.org/10.1103/PhysRevC.92.024004 Physical Review C 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. application/pdf American Physical Society APS |
| spellingShingle | Schmidt-Wellenburg, P. Bossy, J. Farhi, E. Fertl, M. Leung, K. K. H. Rahli, A. Soldner, T. Zimmer, O. Farhi, Edward H Experimental study of ultracold neutron production in pressurized superfluid helium |
| title | Experimental study of ultracold neutron production in pressurized superfluid helium |
| title_full | Experimental study of ultracold neutron production in pressurized superfluid helium |
| title_fullStr | Experimental study of ultracold neutron production in pressurized superfluid helium |
| title_full_unstemmed | Experimental study of ultracold neutron production in pressurized superfluid helium |
| title_short | Experimental study of ultracold neutron production in pressurized superfluid helium |
| title_sort | experimental study of ultracold neutron production in pressurized superfluid helium |
| url | http://hdl.handle.net/1721.1/108366 https://orcid.org/0000-0002-7309-8489 |
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