Spallation Ultracold-Neutron Production in Superfluid Helium

Masuda, Y.; Kitagaki, T.; Hatanaka, K.; Higuchi, M.; Ishimoto, S.; Kiyanagi, Yoshiaki; Morimoto, K.; Muto, S.; Yoshimura, Masaki

doi:10.1103/physrevlett.89.284801

Cited by 58 publications

(34 citation statements)

References 14 publications

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“…The present experiments were complemented by a time-of-flight (TOF) measurement of the incident cold neutron beam to enable a better comparison with the theoretical UCN production rate. As in prior experiments performed by other groups [20,21,29,30], we found the UCN production rate to agree reasonably well with the theoretical expectation.…”

Section: Introductionsupporting

confidence: 91%

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

et al. 2010

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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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Section: Introductionsupporting

confidence: 91%

“…The most intense source for user experiments with UCN, at the Institut Laue Langevin in Grenoble [15], provides UCN densities not exceeding a few 10 per cm 3 . In order to improve counting statistical accuracy of experiments, new UCN sources are being developed in many laboratories around the world [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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“…UCN are produced in a research reactor by extracting the low-energy part of the Maxwellian spectrum of cold neutrons. Considerable progress has been made [3][4][5][6][7] over the last decade to produce superthermal sources of UCN experimentally [8]. Well known UCN physics applications include measurements of the neutron electric dipole moment [7,9] and of the neutron half-life time [9] as well as the observation of the UCN quantum states in the Earth's gravitational field [10,11].…”

Section: Introductionmentioning

confidence: 99%

Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system

et al. 2014

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We perform classical 3D Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter.

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“…Besides the Steyerl turbine, two LHe sources and three SD 2 sources are currently operating at the ILL [16], RCNP/KEK [17], LANSCE [18,19], PSI [20], and at the TRIGA Mainz [21]. For a recent comparison see Ref.…”

Section: Pos(inpc2016)359mentioning

confidence: 99%

Cold and Ultra-cold Neutrons as Probes of New Physics

Konrad¹,

Abele²

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Despite the great success of the Standard Model, many key questions in particle physics, astrophysics, and cosmology are unanswered. In particular, more than 95 % of the universe consists of unknown dark matter and dark energy. Today, a major goal of particle physics is to look for evidence of new physics beyond the Standard Model. Collider searches for new physics are well suited to the direct production of new high-mass particles, whereas low-energy precision experiments search for traces that new particles leave in known processes. Direct and indirect evidence of new physics are highly complementary. High-precision experiments with extremely slow, cold and ultra-cold neutrons address some of the unanswered questions, for instance, on the nature of the fundamental forces and underlying symmetries, the origin, evolution, and fate of the universe, or on the nature of the gravitational force at very small distances. For example, the limit on the electric dipole moment of the neutron constrains the CP violating phases, the lifetime of the neutron determines the relative helium abundance in the universe, and neutrons bouncing over a mirror probe dark matter and dark energy. New facilities and technological developments now give window for significant improvement in precision by one to two orders of magnitude. In this paper, we will give an overview of current and planned facilities and experiments, as well as an overview of some of the applications of neutrons to astrophysics, cosmology, and physics beyond the Standard Model.

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Spallation Ultracold-Neutron Production in Superfluid Helium

Cited by 58 publications

References 14 publications

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

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

Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system

Cold and Ultra-cold Neutrons as Probes of New Physics

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