Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC

K. Mishima, S. Imajo, M. Hino, T. Ino, Y. Iwashita, R. Katayama, M. Kitaguchi, T. Oda, H. M. Shimizu, M. Utsuro, S. Yamashita, T. Yoshioka

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Ultracold neutrons (UCNs) are neutrons whose kinetic energy is around a few hundred nanoelectronvolts. Neutrons with such small kinetic energy can be trapped in a material vessel or magnetic fields. Because of these unique characteristics, UCNs are used for some important experiments of fundamental physics. The Doppler shifter is a device to produce UCN by slowing them down by the reflection on a mirror moving with half of the velocity of incoming neutrons. A Doppler shifter using a quadruple-stack of monochromatic supermirrors that reflects neutrons with a velocity around 68m/s [1, Hino et al.(2010)] was fabricated, and operated with a pulsed neutron source of J-PARC. An important feature of the Doppler shifter is the use of a pulsed neutron beam. Unlike in continuous neutron beams, the neutron velocity can be selected by choosing a time slice in a pulsed neutron bunch. Thus the UCN production improves by ∼80 times in the case of J-PARC. We successfully produced the UCNs by the Doppler shifter: the measured UCN production rate is consistent with the simulations.

Original languageEnglish
Article number012030
JournalJournal of Physics: Conference Series
Volume528
Issue number1
DOIs
Publication statusPublished - Jan 1 2014
EventInternational Workshop on Neutron Optics and Detectors, NOP and D 2013 - Munich, Germany
Duration: Jul 2 2013Jul 5 2013

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cold neutrons
neutrons
neutron beams
kinetic energy
neutron sources
vessels

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC. / Mishima, K.; Imajo, S.; Hino, M.; Ino, T.; Iwashita, Y.; Katayama, R.; Kitaguchi, M.; Oda, T.; Shimizu, H. M.; Utsuro, M.; Yamashita, S.; Yoshioka, T.

In: Journal of Physics: Conference Series, Vol. 528, No. 1, 012030, 01.01.2014.

Research output: Contribution to journalConference article

Mishima, K, Imajo, S, Hino, M, Ino, T, Iwashita, Y, Katayama, R, Kitaguchi, M, Oda, T, Shimizu, HM, Utsuro, M, Yamashita, S & Yoshioka, T 2014, 'Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC', Journal of Physics: Conference Series, vol. 528, no. 1, 012030. https://doi.org/10.1088/1742-6596/528/1/012030
Mishima, K. ; Imajo, S. ; Hino, M. ; Ino, T. ; Iwashita, Y. ; Katayama, R. ; Kitaguchi, M. ; Oda, T. ; Shimizu, H. M. ; Utsuro, M. ; Yamashita, S. ; Yoshioka, T. / Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC. In: Journal of Physics: Conference Series. 2014 ; Vol. 528, No. 1.
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