排序方式: 共有7条查询结果,搜索用时 0 毫秒
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A. Anghel T. L. Bailey G. Bison B. Blau L. J. Broussard S. M. Clayton C. Cude-Woods M. Daum A. Hawari N. Hild P. Huffman T. M. Ito K. Kirch E. Korobkina B. Lauss K. Leung E. M. Lutz M. Makela G. Medlin C. L. Morris R. W. Pattie D. Ries A. Saunders P. Schmidt-Wellenburg V. Talanov A. R. Young B. Wehring C. White M. Wohlmuther G. Zsigmond 《The European Physical Journal A - Hadrons and Nuclei》2018,54(9):148
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Zimmer O Baumann K Fertl M Franke B Mironov S Plonka C Rich D Schmidt-Wellenburg P Wirth HF van den Brandt B 《Physical review letters》2007,99(10):104801
We report the first successful extraction of accumulated ultracold neutrons (UCN) from a converter of superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. Windowless UCN extraction is performed in vertical direction through a mechanical cold valve. This prototype of a versatile UCN source is comprised of a novel cryostat designed to keep the source portable and to allow for rapid cooldown. We measured time constants for UCN storage and extraction into a detector at room temperature, with the converter held at various temperatures between 0.7 and 1.3 K. The UCN production rate inferred from the count rate of extracted UCN is close to the theoretical expectation. 相似文献
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M. Daum P. FierlingerB. Franke P. GeltenbortL. Goeltl E. GutsmiedlJ. Karch G. KesslerK. Kirch H.-C. KochA. Kraft T. LauerB. Lauss E. PierreG. Pignol D. ReggianiP. Schmidt-Wellenburg Yu. SobolevT. Zechlau G. Zsigmond 《Physics letters. [Part B]》2011,704(5):456-460
Ultracold neutrons were stored in a volume, using a magnetic dipole field shutter. Radial confinement was provided by material walls. Low-field seeking neutrons were axially confined above the magnetic field. High-field seeking neutrons are trapped inside the magnetic field. They can systematically shift the measured neutron lifetime to lower values in experiments with magnetic confinement. 相似文献
4.
Z. Chowdhuri M. Fertl M. Horras K. Kirch J. Krempel B. Lauss A. Mtchedlishvili D. Rebreyend S. Roccia P. Schmidt-Wellenburg G. Zsigmond 《Applied physics. B, Lasers and optics》2014,115(2):257-262
We report on a comparison of spin relaxation rates in a 199Hg magnetometer using different wall coatings. A compact mercury magnetometer was built for this purpose. Glass cells coated with fluorinated materials show longer spin coherence times than if coated with their hydrogenated homologues. The longest spin relaxation time of the mercury vapor was measured with a fluorinated paraffin wall coating. 相似文献
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W. Schott J.M. Pendlebury I. Altarev S. Gröger E. Gutsmiedl F.J. Hartmann S. Paul G. Petzoldt P. Schmidt-Wellenburg U. Trinks 《The European Physical Journal A - Hadrons and Nuclei》2003,16(4):599-601
Ultra-cold neutrons (UCN) are produced in superfluid helium by single- and multi-phonon excitation. The UCN production rate
density R
II via multiphonons can be larger than that by one-phonon excitation R
I being due to the dependence of the incident neutron spectral flux density dφ/dλ on the wavelength λ.
Received: 28 March 2002 / Accepted: 19 December 2002 / Published online: 11 March 2003
RID="a"
ID="a"e-mail: wschott@e18.physik.tu-muenchen.de
RID="b"
ID="b"On leave of absence from PNPI, Gatchina, Russia
Communicated by T. Walcher 相似文献
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Zimmer O. Schmidt-Wellenburg P. Fertl M. Wirth H.-F. Assmann M. Klenke J. van den Brandt B. 《The European Physical Journal C - Particles and Fields》2010,67(3-4):589-599
The European Physical Journal C - We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our... 相似文献
7.
G. Ban G. Bison K. Bodek Z. Chowdhuri P. Geltenbort W. C. Griffith V. Hélaine R. Henneck M. Kasprzak Y. Kermaidic K. Kirch S. Komposch P. A. Koss A. Kozela J. Krempel B. Lauss T. Lefort Y. Lemière A. Mtchedlishvili M. Musgrave O. Naviliat-Cuncic F. M. Piegsa E. Pierre G. Pignol G. Quéméner M. Rawlik D. Ries D. Rebreyend S. Roccia G. Rogel P. Schmidt-Wellenburg N. Severijns E. Wursten J. Zejma G. Zsigmond 《The European Physical Journal A - Hadrons and Nuclei》2016,52(10):326
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