Measurement of the Spin Dependence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>p</mml:mi><mml:mo>)</mml:mo><mml:mi mathvariant="normal">T</mml:mi></mml:math>Reaction and of the Nuclear Susceptibility of Adsorbed<mml:math xmlns:mml="http://www.w3.org/199

Passell, L.; Schermer, R.

doi:10.1103/physrev.150.146

Cited by 87 publications

(60 citation statements)

References 19 publications

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“…This indicates that, for given values of P n and ∆σ, the figure of merit for comparing polarized targets in transmission experiments should be τ 2 P 2 t . The figure of merit for the TUNL solid 3 He target exceeds current polarized 3 He gas targets by nearly two orders of magnitude. Furthermore, the densities of the condensed phases of 3 He correspond to nearly 100 MPa of room temperature gas, while targets of polarized 3 He gas are limited to 1 MPa.…”

Section: Experimental Apparatus a Polarized 3 He Targetmentioning

confidence: 86%

“…Owing to the low intensity of the polarized neutron beam, an extremely thick sample of polarized 3 He is desirable. In a measurement of the neutron transmission asymmetry ε, the number of observed neutron counts N necessary to obtain a statistical precision ∆ε/ε is…”

Section: Experimental Apparatus a Polarized 3 He Targetmentioning

confidence: 99%

“…In principle this allows for a much simpler interpretation of the scattering and reaction processes. The n- 3 He total cross sections can be expressed as linear sums of "partial-wave" cross sections σ(J, l, s, l ′ , s ′ ), where…”

Section: Introductionmentioning

confidence: 99%

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Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

et al. 1996

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Measurements of polarized neutron-polarized 3 He scattering are reported. The target consisted of cryogenically-polarized solid 3 He, thickness 0.04 atom/b and polarization ∼ 0.4. Polarized neutrons were produced via the 3 H( p, n) 3 He or 2 H( d, n) 3 He polarization-transfer reactions. The longitudinal and transverse total cross-section differences ∆σ L and ∆σ T were measured for incident neutron energies 2-8 MeV. The results are compared to phase-shift predictions based on four different analyses of n-3 He scattering. The best agreement is obtained with a recent R-matrix analysis of A = 4 scattering and reaction data, lending strong support to the 4 He level scheme obtained in that analysis. Discrepancies with other phase-shift parameterizations of n-3 He scattering exist, attributable in most instances to one or two particular partial waves.

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Section: Experimental Apparatus a Polarized 3 He Targetmentioning

confidence: 86%

Section: Experimental Apparatus a Polarized 3 He Targetmentioning

confidence: 99%

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Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

et al. 1996

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“…P (5) have shown that the thermal 3~e ( n ,~)~ cross section is essentially all associated with a J = 0 state of the compound system, which means that u p = -oo. The transmission flipping ratio is then 2Ntfnao RT = e which is very convenient for nuclear polarization determination.…”

Section: The Transmission Of Neutrons Through the Unpolarized Sample mentioning

confidence: 99%

THERMOMETRY AT VERY LOW TEMPERATURES WITH POLARIZED NEUTRONS, APPLICATION TO THE SEARCH FOR THE ³He MAGNETIC STRUCTURE

et al. 1982

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Résumé. -Les thermomètres, en dessous de 20 mK, nécessitent généralement un étalonnage. Ce n'est pas le cas pour les thermomètres qui mesurent la polarisation des spins nucléaires provoquée par un champ magnétique appliqué, en l'absence de moments magnétiques électroniques. On peut réaliser de telles mesures avec précision en utilisant des neutrons polarisés, soit par diffraction, soit par absorption. On décrit un montage destiné à étudier l'ordre magnétique dans 3 H e sol ide en dessous de 1 mK. A ces températures le couplage thermique entre les différents éléments n'est pas toujours bon. Pour connaî-tre la température d'un élément il faut la mesurer directement et in situ. C'est ainsi qu'on mesure la température du porte-échantillon en cuivre par diffraction de neutrons polarisés et celle de l'^He solide par des mesures de transmission, l'absorption dépendant du spin des neutrons. On montre ainsi que l'%e a été refroidi en dessous de sa température de Néel.Abstract. -Most of the thermometers, below 20 mK, require calibration in their temperature range before use. This is not the case for thermometers based on the measurement of the nuclear spin polarization resulting from an applied magnetic field, in the absence of electronic magnetic moments. Such measurements can be achieved accurately with polarized neutrons, either by coherent scattering or by absorption measurements. An experimental set up, for studying the ^~Re nuclear magnetic order below 1 mK, is described. At these temperatures the thermal coupling between the different parts of the set up is uncertain. To know the temperature of one given element of the set up, it is necessary to measure it in situ and directly ; polarized neutrons are very well adapted. Diffraction measurements give the temperature of the copper cell which contains while transmission measurements indicate the temperature of the nuclear spins and show whether they have been cooled below the transition.

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“…which has a much larger cross section when the n− 3 He have a total spin J = 0 compared to J = 1 [8]. In a magnetic field B 0 , the UCN and 3 He spins will precess at their respective Larmor frequencies: ω n = γ n B 0 and ω 3 = γ 3 B 0 , where γ i is the gyromagnetic ratio of each species.…”

mentioning

confidence: 99%

Dressed spin of polarized3He in a cell

et al. 2011

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We report a measurement of the modification of the effective precession frequency of polarized 3 He atoms in response to a dressing field in a room temperature cell. The 3 He atoms were polarized using the metastability spin-exchange method. An oscillating dressing field is then applied perpendicular to the constant magnetic field. Modification of the 3 He effective precession frequency was observed over a broad range of the amplitude and frequency of the dressing field. The observed effects are compared with calculations based on quantum optics formalism.Key words: dressed spin; polarized 3 He; neutron EDM PACS: 11.30.Er,, 13.40.Em,, 21.10.Dk A non-zero neutron electric dipole moment(EDM) is direct evidence for violations of both parity (P ) and time-reversal (T ) symmetries [1,2]. Assuming CP T invariance, T violation also implies CP -violation [3]. Observation of a non-zero neutron EDM would provide qualitatively new information on the origin of CP -violation, since no CP violation has ever been found for a baryon or a hadron containing light quarks only, like a neutron.The most sensitive neutron EDM measurement was carried out at the ILL (Institut Laue Langevin) using bottled ultracold neutrons (UCNs) and an upper limit of |d n | < 2.9 × 10 −26 e cm (90% C.L.) was obtained [4]. A non-zero

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Measurement of the Spin Dependence of theHe3(n, p)TReaction and of the Nuclear Susceptibility of Adsorbed
L. Passell
¹
,
R. Schermer
²

Cited by 87 publications

References 19 publications

Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

THERMOMETRY AT VERY LOW TEMPERATURES WITH POLARIZED NEUTRONS, APPLICATION TO THE SEARCH FOR THE ³He MAGNETIC STRUCTURE

Dressed spin of polarized3He in a cell

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Measurement of the Spin Dependence of theHe3(n, p)TReaction and of the Nuclear Susceptibility of AdsorbedL. Passell1, R. Schermer2

Cited by 87 publications

References 19 publications

Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

Measurements of the total cross section for the scattering of polarized neutrons from polarizedHe3

THERMOMETRY AT VERY LOW TEMPERATURES WITH POLARIZED NEUTRONS, APPLICATION TO THE SEARCH FOR THE 3He MAGNETIC STRUCTURE

Dressed spin of polarized3He in a cell

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Measurement of the Spin Dependence of theHe3(n, p)TReaction and of the Nuclear Susceptibility of Adsorbed
L. Passell
¹
,
R. Schermer
²

THERMOMETRY AT VERY LOW TEMPERATURES WITH POLARIZED NEUTRONS, APPLICATION TO THE SEARCH FOR THE ³He MAGNETIC STRUCTURE