First observation of trapped high-field seeking ultracold neutron spin states

Daum, M.; Fierlinger, P.; Franke, B.; Geltenbort, P.; Goeltl, L.; Gutsmiedl, E.; Karch, Jakub; Keßler, G.; Kirch, K.; Koch, H.-C.; Kraft, Andreas; Lauer, T.; Lauss, B.; Pierre, E.; Pignol, G.; Reggiani, D.; Schmidt-Wellenburg, P.; Sobolev, Yu.; Zechlau, T.; Zsigmond, G.

doi:10.1016/j.physletb.2011.09.063

Cited by 6 publications

(8 citation statements)

References 14 publications

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“…Some of these high-fieldseeking UCN may, however, have energies up to ∼100 neV. This phenomenon of trapping UCN with two different spin directions in the same apparatus was published earlier [76].…”

Section: Methodssupporting

confidence: 57%

“…As was shown before [76], we have for absorber positions z > 30 cm both LFS and HFS stored in the apparatus. For the determination of the storage-time constants, τ st , as well as the spin-flip counts, N sp , of the LFS, the corresponding contributions from the HFS have to be evaluated and subtracted.…”

Section: Energy Distribution Of the Lfsmentioning

confidence: 99%

“…The neutrons in the region of the high magnetic field below z ≈ 10 cm have opposite spins compared to the LFS and were identified as HFS trapped during the rapid ramping of the field [76].…”

Section: Energy Distribution Of the Lfsmentioning

confidence: 99%

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Losses and depolarization of ultracold neutrons on neutron guide and storage materials

et al. 2017

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At Institut Laue-Langevin (ILL) and Paul Scherrer Institute (PSI), we have measured the losses and depolarization probabilities of ultracold neutrons on various materials: (i) nickel-molybdenum alloys with weight percentages of 82/18, 85/15, 88/12, 91/9, and 94/6 and natural nickel Ni100, (ii) nickel-vanadium NiV93/7, (iii) copper, and (iv) deuterated polystyrene (dPS). For the different samples, storage-time constants up to ∼460 s were obtained at room temperature. The corresponding loss parameters for ultracold neutrons, η, varied between 1.0 × 10 −4 and 2.2 × 10 −4 . All η values are in agreement with theory except for dPS, where anomalous losses at room temperature were established with four standard deviations. The depolarization probabilities per wall collision β measured with unprecedented sensitivity varied between 0.7 × 10 −6 and 9.0 × 10 −6 . Our depolarization result for copper differs from other experiments by 4.4 and 15.8 standard deviations. The β values of the paramagnetic NiMo alloys over molybdenum content show an increase of β with increasing Mo content. This is in disagreement with expectations from literature. Finally, ferromagnetic behavior of NiMo alloys at room temperature was found for molybdenum contents of 6.5 at.% or less and paramagnetic behavior for more than 8.7 at.%. This may contribute to solving an ambiguity in literature.

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Section: Methodssupporting

confidence: 57%

Section: Energy Distribution Of the Lfsmentioning

confidence: 99%

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Losses and depolarization of ultracold neutrons on neutron guide and storage materials

et al. 2017

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“…A key feature of the new method is the combination of the vertical confinement by gravity and quantum reflection from a mirror and the radial confinement by the magnetic field of a vertical linear current. Both confinement principles are well established [3,[49][50][51][52][53]. However, the combination of the two approaches seems to be challenging as the magnetic field might produce large false effects thus making impossible any precision studies of GQSs.…”

Section: Introductionmentioning

confidence: 99%

A magneto-gravitational trap for studies of gravitational quantum states

Nesvizhevsky¹,

Nez

Vasiliev

et al. 2020

Eur. Phys. J. C

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Observation time is the key parameter for improving the precision of measurements of gravitational quantum states of particles levitating above a reflecting surface. We propose a new method of long confinement in such states of atoms, anti-atoms, neutrons and other particles possessing a magnetic moment. The earth gravitational field and a reflecting mirror confine particles in the vertical direction. The magnetic field originating from electric current passing through a vertical wire confines particles in the radial direction. Under appropriate conditions, motions along these two directions are decoupled to a high degree. We estimate characteristic parameters of the problem, and list possible systematic effects that limit storage times due to the coupling of the two motions.

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“…In neutron physics, magnetic traps for LFS have been realized previously [11,12] and are used for the precise measurement of the life-time of the free neutron. However, trapping of HFS has only been demonstrated recently [13]. In this work, a new type of magnetic trap for UCN is presented.…”

Section: Introductionmentioning

confidence: 99%

A magnetic trap for high-field seeking neutron spin states

et al. 2015

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A first experimental demonstration of a new type of magnetic trap for ultra-cold neutrons is presented. High-field seeking spin-states are trapped in a potential formed by the magnetic field of a straight wire and a repulsive coating on the wire surface. Life-times of the trapped neutrons of 60 s could be observed. This configuration can in principle be used to form bound states of the wave function on the surface of the wire to probe new forces at short distances. Further applications include the use as a guide and selector for perfectly polarized neutrons.

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First observation of trapped high-field seeking ultracold neutron spin states

Cited by 6 publications

References 14 publications

Losses and depolarization of ultracold neutrons on neutron guide and storage materials

Losses and depolarization of ultracold neutrons on neutron guide and storage materials

A magneto-gravitational trap for studies of gravitational quantum states

A magnetic trap for high-field seeking neutron spin states

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