Spin exchange optical pumping at pressures near 1 bar for neutron spin filters

Rich, D. R.; Gentile, Thomas R.; Smith, T. B.; Thompson, A. K.; Jones, G. L.

doi:10.1063/1.1461424

Cited by 60 publications

(56 citation statements)

References 27 publications

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“…Relatively large quantities of hyperpolarized 3 He are produced with 50-80% polarization using metastability-exchange optical pumping. 3 He in the gas state has a T 1 relaxation time that can reach days and even weeks [6,7]. As a beneficial consequence, 3 He can be distributed from a central polarizing site to MRI centers [8].…”

Section: Introductionmentioning

confidence: 99%

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

et al. 2008

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“…We used the spin-exchange optical pumping (SEOP) method (see e.g. [18,19]) to polarize the target. Two different target cells, with in situ spin relaxation times of 115 h and 35 h, were used in the experiment.…”

Section: Fig 1: Schematic Representation Of the Experiments (Not To Smentioning

confidence: 99%

Precision Measurement of then−He3Incoherent Scattering Length Using Neutron Interferometry

et al. 2009

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We report the first measurement of the low-energy neutron-3 He incoherent scattering length using neutron interferometry: b i = (−2.512 ± 0.012 statistical ± 0.014 systematic) fm. This is in good agreement with a recent calculation using the AV18+3N potential. The neutron-3 He scattering lengths are important for testing and developing nuclear potential models that include three nucleon forces, effective field theories for few-body nuclear systems, and neutron scattering measurements of quantum excitations in liquid helium. This work demonstrates the first use of a polarized nuclear target in a neutron interferometer. [5,6,7]. Effective field theory methods, which are logically related to the QCD Lagrangian and allow for better estimates of theoretical uncertainty, show promise for similar success in the near future [8]. But even with the inclusion of many-body forces, modern NN potentials have had only modest success in predicting scattering observables in light nuclei. The aim of our program is to contribute to a complete set of basic experimental results for light nuclei which can be used in formulating the next generation of NN and many-body potentials.Neutron scattering lengths at the zero-energy limit can be directly and accurately measured using neutron interferometry. These are excellent high-precision bench marks for testing and/or calibrating the latest few-nucleon theoretical methods. Recent precision scattering length measurements include n-H, n-D, and n-3 He (coherent) [9,10,11,12]. In general the agreement between these data and the best theoretical models, including 3N forces, is not very good. The situation with 3 He is further clouded by the fact that two recent precision determinations of the coherent scattering length disagree by more than seven standard deviations [11,12]. The incoherent scattering length was recently measured from the pseudomagnetic neutron spin rotation in polarized 3 He gas [13]. Here we report on the first direct measurement of the n-3 He incoherent scattering length using neutron interferometry. This is also the first successful use of a polarized nuclear target in a neutron interferometer. The incoherent scattering length is also important for interpreting experimental studies of the scattering law S(Q, ω) of liquid 3 He, as pointed out in [13].A neutron interferometer [14,15,16] splits the matter wave of a single neutron into two coherent paths and then recombines them using Bragg diffraction perfect single-crystal silicon. A target placed in one beam path of the neutron interferometer produces a phase shift φ = −N 3 λb z where N 3 , z are the nuclear density and length of the target ( 3 He in this case), λ is the neutron deBroglie wavelength, and b is the real part of the bound neutron scattering length of the target atom. The bound scattering length is appropriate because there is no momentum transfer between the neutron and target. It is related to the free atom scattering length by a = bA/(A + 1), with A the atom/neutron mass ratio. In general the interaction ampl...

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“…As the output laser power of the air-cooled LDA, which is around 30 -40 W, is much lower than that of a water-cooled one, it is enough to polarize 3 He gas within a small-sized cell [6]. The laser spectrum of the LDA is broader than the absorption line width of Rb [7]. Thus, we employed a VHG element to create an external cavity laser (ECL) to narrow the width of the laser spectrum to match it to the absorption line width of Rb [8] (Fig.…”

Section: A Compact Laser Opticsmentioning

confidence: 99%

Development of Compact Laser Optics for an In-situ Spin-Exchange Optical Pumping ³He Neutron Spin Filter

Oku¹,

Hayashida²,

Katô³

et al. 2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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In order to apply a 3 He neutron spin filter (NSF) to experiments at a pulsed neutron experimental facility, it is important to make the setup stable and easy to set up and operate, because the setup is located inside a radiation shield for high-energy gamma rays and neutrons. In this study, we have developed compact laser optics with a volume holographic grating element for a spin-exchange optical pumping (SEOP) method, and composed a setup for an in-situ SEOP 3 He NSF. The design and performance of the setup are reported.

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Spin exchange optical pumping at pressures near 1 bar for neutron spin filters

Abstract: Articles you may be interested inAn all-optical scalar and vector spin-exchange relaxation-free magnetometer employing on-off pump modulation

Cited by 60 publications

References 27 publications

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

Precision Measurement of then−He3Incoherent Scattering Length Using Neutron Interferometry

Development of Compact Laser Optics for an In-situ Spin-Exchange Optical Pumping ³He Neutron Spin Filter

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Spin exchange optical pumping at pressures near 1 bar for neutron spin filters

Abstract: Articles you may be interested inAn all-optical scalar and vector spin-exchange relaxation-free magnetometer employing on-off pump modulation

Cited by 60 publications

References 27 publications

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

Precision Measurement of then−He3Incoherent Scattering Length Using Neutron Interferometry

Development of Compact Laser Optics for an In-situ Spin-Exchange Optical Pumping 3He Neutron Spin Filter

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Development of Compact Laser Optics for an In-situ Spin-Exchange Optical Pumping ³He Neutron Spin Filter