Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease

Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downsca...
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Gespeichert in:

Autor*in:	Zimmer, O. [verfasserIn] Schmidt-Wellenburg, P. [verfasserIn] Fertl, M. [verfasserIn] Wirth, H.-F. [verfasserIn] Assmann, M. [verfasserIn] Klenke, J. [verfasserIn] van den Brandt, B. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2010

Schlagwörter:	Cold Neutron Ultracold Neutron Versus Trap Cold Neutron Beam Storage Lifetime

Übergeordnetes Werk:	Enthalten in: The European physical journal - Berlin : Springer, 1998, 67(2010), 3-4 vom: 27. Apr., Seite 589-599
Übergeordnetes Werk:	volume:67 ; year:2010 ; number:3-4 ; day:27 ; month:04 ; pages:589-599

Links:	Volltext

DOI / URN:	10.1140/epjc/s10052-010-1327-1

Katalog-ID:	SPR008321183

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matchkey_str	article:14346052:2010----::lrclnurnetatdrmsprlihlucnetrot
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bklnumber	33.50
publishDate	2010
allfields	10.1140/epjc/s10052-010-1327-1 doi (DE-627)SPR008321183 (SPR)s10052-010-1327-1-e DE-627 ger DE-627 rakwb eng 530 ASE 33.50 bkl Zimmer, O. verfasserin aut Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease 2010 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation. Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213 Schmidt-Wellenburg, P. verfasserin aut Fertl, M. verfasserin aut Wirth, H.-F. verfasserin aut Assmann, M. verfasserin aut Klenke, J. verfasserin aut van den Brandt, B. verfasserin aut Enthalten in The European physical journal Berlin : Springer, 1998 67(2010), 3-4 vom: 27. Apr., Seite 589-599 (DE-627)253722934 (DE-600)1459069-4 1434-6052 nnns volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599 https://dx.doi.org/10.1140/epjc/s10052-010-1327-1 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_63 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_110 GBV_ILN_120 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_267 GBV_ILN_293 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4246 GBV_ILN_4305 GBV_ILN_4307 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4338 33.50 ASE AR 67 2010 3-4 27 04 589-599
spelling	10.1140/epjc/s10052-010-1327-1 doi (DE-627)SPR008321183 (SPR)s10052-010-1327-1-e DE-627 ger DE-627 rakwb eng 530 ASE 33.50 bkl Zimmer, O. verfasserin aut Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease 2010 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation. Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213 Schmidt-Wellenburg, P. verfasserin aut Fertl, M. verfasserin aut Wirth, H.-F. verfasserin aut Assmann, M. verfasserin aut Klenke, J. verfasserin aut van den Brandt, B. verfasserin aut Enthalten in The European physical journal Berlin : Springer, 1998 67(2010), 3-4 vom: 27. Apr., Seite 589-599 (DE-627)253722934 (DE-600)1459069-4 1434-6052 nnns volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599 https://dx.doi.org/10.1140/epjc/s10052-010-1327-1 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_63 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_110 GBV_ILN_120 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_267 GBV_ILN_293 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4246 GBV_ILN_4305 GBV_ILN_4307 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4338 33.50 ASE AR 67 2010 3-4 27 04 589-599
allfields_unstemmed	10.1140/epjc/s10052-010-1327-1 doi (DE-627)SPR008321183 (SPR)s10052-010-1327-1-e DE-627 ger DE-627 rakwb eng 530 ASE 33.50 bkl Zimmer, O. verfasserin aut Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease 2010 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation. Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213 Schmidt-Wellenburg, P. verfasserin aut Fertl, M. verfasserin aut Wirth, H.-F. verfasserin aut Assmann, M. verfasserin aut Klenke, J. verfasserin aut van den Brandt, B. verfasserin aut Enthalten in The European physical journal Berlin : Springer, 1998 67(2010), 3-4 vom: 27. Apr., Seite 589-599 (DE-627)253722934 (DE-600)1459069-4 1434-6052 nnns volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599 https://dx.doi.org/10.1140/epjc/s10052-010-1327-1 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_63 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_110 GBV_ILN_120 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_267 GBV_ILN_293 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4246 GBV_ILN_4305 GBV_ILN_4307 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4338 33.50 ASE AR 67 2010 3-4 27 04 589-599
allfieldsGer	10.1140/epjc/s10052-010-1327-1 doi (DE-627)SPR008321183 (SPR)s10052-010-1327-1-e DE-627 ger DE-627 rakwb eng 530 ASE 33.50 bkl Zimmer, O. verfasserin aut Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease 2010 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation. Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213 Schmidt-Wellenburg, P. verfasserin aut Fertl, M. verfasserin aut Wirth, H.-F. verfasserin aut Assmann, M. verfasserin aut Klenke, J. verfasserin aut van den Brandt, B. verfasserin aut Enthalten in The European physical journal Berlin : Springer, 1998 67(2010), 3-4 vom: 27. Apr., Seite 589-599 (DE-627)253722934 (DE-600)1459069-4 1434-6052 nnns volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599 https://dx.doi.org/10.1140/epjc/s10052-010-1327-1 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_63 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_110 GBV_ILN_120 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_267 GBV_ILN_293 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4246 GBV_ILN_4305 GBV_ILN_4307 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4338 33.50 ASE AR 67 2010 3-4 27 04 589-599
allfieldsSound	10.1140/epjc/s10052-010-1327-1 doi (DE-627)SPR008321183 (SPR)s10052-010-1327-1-e DE-627 ger DE-627 rakwb eng 530 ASE 33.50 bkl Zimmer, O. verfasserin aut Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease 2010 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation. Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213 Schmidt-Wellenburg, P. verfasserin aut Fertl, M. verfasserin aut Wirth, H.-F. verfasserin aut Assmann, M. verfasserin aut Klenke, J. verfasserin aut van den Brandt, B. verfasserin aut Enthalten in The European physical journal Berlin : Springer, 1998 67(2010), 3-4 vom: 27. Apr., Seite 589-599 (DE-627)253722934 (DE-600)1459069-4 1434-6052 nnns volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599 https://dx.doi.org/10.1140/epjc/s10052-010-1327-1 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_63 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_110 GBV_ILN_120 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_267 GBV_ILN_293 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4246 GBV_ILN_4305 GBV_ILN_4307 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4338 33.50 ASE AR 67 2010 3-4 27 04 589-599
language	English
source	Enthalten in The European physical journal 67(2010), 3-4 vom: 27. Apr., Seite 589-599 volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599
sourceStr	Enthalten in The European physical journal 67(2010), 3-4 vom: 27. Apr., Seite 589-599 volume:67 year:2010 number:3-4 day:27 month:04 pages:589-599
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Cold Neutron Ultracold Neutron Versus Trap Cold Neutron Beam Storage Lifetime
dewey-raw	530
isfreeaccess_bool	true
container_title	The European physical journal
authorswithroles_txt_mv	Zimmer, O. @@aut@@ Schmidt-Wellenburg, P. @@aut@@ Fertl, M. @@aut@@ Wirth, H.-F. @@aut@@ Assmann, M. @@aut@@ Klenke, J. @@aut@@ van den Brandt, B. @@aut@@
publishDateDaySort_date	2010-04-27T00:00:00Z
hierarchy_top_id	253722934
dewey-sort	3530
id	SPR008321183
language_de	englisch
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author	Zimmer, O.
spellingShingle	Zimmer, O. ddc 530 bkl 33.50 misc Cold Neutron misc Ultracold Neutron misc Versus Trap misc Cold Neutron Beam misc Storage Lifetime Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
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topic_title	530 ASE 33.50 bkl Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease Cold Neutron (dpeaa)DE-He213 Ultracold Neutron (dpeaa)DE-He213 Versus Trap (dpeaa)DE-He213 Cold Neutron Beam (dpeaa)DE-He213 Storage Lifetime (dpeaa)DE-He213
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title	Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
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title_full	Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
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author_browse	Zimmer, O. Schmidt-Wellenburg, P. Fertl, M. Wirth, H.-F. Assmann, M. Klenke, J. van den Brandt, B.
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title_sort	ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
title_auth	Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
abstract	Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation.
abstractGer	Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation.
abstract_unstemmed	Abstract We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation.
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title_short	Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease
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Ultracold neutrons extracted from a superfluid-helium converter coated with fluorinated grease

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