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Abragam, A.; Bacchella, G.L.; Glätti, H.; Meriel, P.; Pinot, M.; Piesvaux, J.

doi:10.1103/physrevlett.31.776

Cited by 43 publications

(16 citation statements)

References 3 publications

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“…It has been applied to thermal neutron beams later [9]. The gist of the method is to compare the precession angle of a polarised neutron beam passing through a magnetic field H with the phase of an rf field rotating at the neutron Larmor frequency.…”

Section: The Pseudomagnetic Precession Methodsmentioning

confidence: 99%

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A new measurement of the51V spin dependent scattering length

Glättli

Eisenkremer

Pinot

1987

Z. Physik A - Atomic Nuclei

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Section: The Pseudomagnetic Precession Methodsmentioning

confidence: 99%

“…The first coil establishes a precessing magnetisation before the neutrons enter the sample and the second coil, placed after the sample allows one to determine the precession angle through a polarisation analysis. As shown in ref [9], the precession angle can best be inferred from the flipping ratio R defined by…”

Section: The Pseudomagnetic Precession Methodsmentioning

confidence: 99%

A new measurement of the51V spin dependent scattering length

Glättli

Eisenkremer

Pinot

1987

Z. Physik A - Atomic Nuclei

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“…The angle of the polarization of a neutron initially polarized normal to the target polarization precesses as it moves through the medium. This phenomenon is referred to as nuclear pseudomagnetic precession [351] and has been used to measure scattering length differences in many nuclei. Recently, a highprecision measurement of this precession angle was performed in polarized 3 He using a neutron spin-echo spectrometer at the ILL [352].…”

Section: Precision Scattering Length Measurements Using Interferometrmentioning

confidence: 99%

Fundamental Neutron Physics

Nico

Snow

2005

Annu. Rev. Nucl. Part. Sci.

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▪ Abstract Experiments using slow neutrons address a growing range of scientific issues spanning nuclear physics, particle physics, astrophysics, and cosmology. The field of fundamental physics using neutrons has experienced a significant increase in activity over the last two decades. This review summarizes some of the recent developments in the field and outlines some of the prospects for future research.

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“…The large pseudomagnetic moments of H 1 and V 51 give measurable precession angles even at 1 K. 5 But for many nuclei, M* is much smaller and, consequently, much higher polarizations are needed. Two somewhat complementary methods can be used to achieve sizable nuclear polarizations.…”

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confidence: 99%

“…Such a method has been described in a previous Letter. 5 The extra precession angle due to the pseudomagnetic field is a = -y n HH = -y n H*l/v y I being the sample length and v the neutron velocity. This extra precession angle is measured from the ratio R =I + /l" by the relation coso?…”

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confidence: 99%

Systematic Pseudomagnetic Measurements of the Spin-Dependent Scattering Length of Slow Neutrons with Atomic Nuclei

et al. 1974

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The magnitude and the sign of spin-dependent scattering lengths of slow neutrons by nuclei of Li 7 , Al 27 , Sc 45 , Zr 91 , Nb 93 , La 139 , and Ta 181 have been determined by measuring the dependence of the precession angle of the neutron spins on the nuclear polarization of the scattering target.The scattering of slow neutrons by a fixed nucleus can be described by the scattering lengthwhere Ijy and s are the spins of the nucleus and the neutron, respectively. The parameter a N = (a + -a-)/(/# + !) (a + and «. being the nuclear scattering lengths of the nucleus for the two spin channels I N + \ and I N -i) is unknown for most nuclei. The growing use of polarized neutron beams, and targets with sizable polarizations obtained either in static fields at very low temperatures or by dynamic nuclear polarization, makes the knowledge of a N of greater interest. In this Letter, we report values of a N for a few nuclei.In analogy to neutron magnetic scattering, a new formalism has been introduced previously, and its physical validity experimentally demonstrated. 1 "* 3 It defines, inside a nuclear target, a pseudomagnetic field i/* produced by the pseudomagnetic moments M* of the target nuclei such thatwhere N is the number of nuclei per unit volume, P is their polarization, and jit* is given bywith jii B the Bohr magneton, r 0 = e 2 /mc 2 the classical radius of the electron, and^" = ii n /ii N = -1.913 the neutron magnetic moment expressed in nuclear magnetons. In a static field H 0 , the neutron magnetic moment will precess with the Larmor frequency o) L = -y n H 0 , where y n -2\i n /H= -2TT x 2 917 sec" 1 G" 1 is the gyromagnetic factor of the neutron. The effect of the pseudomagnetic fieldi/* is to change the Larmor precession frequency Co L of the neutrons inside the target by an amount Au). L = -y n H*, as first shown theoretically by Barytchevski and Podgoretzki. 4 A very sensitive method to measure small changes in precession frequency is through the change in the precession angle of the neutron polarization. Such a method has been described in a previous Letter. 5 The extra precession angle due to the pseudomagnetic field is a = -y n HH = -y n H*l/v y I being the sample length and v the neutron velocity. This extra precession angle is measured from the ratio R =I + /l" by the relation coso? = (l -R)/Dp 2 (l-eR),where I + and /" are the counting rates of the analyzer for opposite incoming-neutron polarizations (corrected for background), p 2 is the product of the polarizing and analyzing efficiencies, and e is the efficiency of the flipping coil used to reverse the incoming-neutron polarization. In our setup, p 2 = 0.990 andp 2 e = 0.981. The coefficient D takes into account any dephasing process resulting in a decrease of the measured polarization. It has been measured separately for each sample.The large pseudomagnetic moments of H 1 and V 51 give measurable precession angles even at 1 K. 5 But for many nuclei, M* is much smaller and, consequently, much higher polarizations are needed. Two somewhat compleme...

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Pseudo Magnetic Moments ofH1andV<

Cited by 43 publications

References 3 publications

A new measurement of the51V spin dependent scattering length

A new measurement of the51V spin dependent scattering length

Fundamental Neutron Physics

Systematic Pseudomagnetic Measurements of the Spin-Dependent Scattering Length of Slow Neutrons with Atomic Nuclei

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