Complementarity of low-energy spin polarized radioactive nuclei and muons

Kiefl, R. F.; Morris, G. D.; Amaudruz, P.; Baartman, R.; Behr, J. A.; Brewer, J. H.; Chakhalian, J.; Daviel, S.; Doornbos, J.; Dunsiger, S. R.; Kreitzman, S. R.; Kuo, T.; Levy, C.D.P.; Miller, R. I.; Olivo, M.; Poutissou, R.; Wight, G. W.; Zelenski, A.

doi:10.1016/s0921-4526(00)00301-x

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…1 However, much greater sensitivity can be obtained with closely related nuclear methods such as ␤-detected nuclear magnetic resonance (␤-NMR) where the signal comes from the decay properties of a radioactive nucleus. [2][3][4][5] For example, in the case of 8 Li, which has a mean lifetime of 1.2 s, a high energy electron is emitted preferentially in the opposite direction of the nuclear polarization. We have recently created a beam of low-energy highly polarized radioactive 8 Li + for doing ␤-NMR.…”

Section: Introductionmentioning

confidence: 99%

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β-detected nuclear quadrupole resonance with a low-energy beam ofLi+8

et al. 2004

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A nuclear quadrupole resonance (NQR) spectrum of 8 Li has been observed in a single crystal of SrTiO 3 using a beam of low-energy highly polarized radioactive 8 Li + . The resonances were detected by monitoring the ␤-decay anisotropy as a function of a small audio frequency magnetic field. These results demonstrate that low energy nuclear spin polarized 8 Li can be used as a sensitive probe of the local magnetic and electronic environment in nanostructures and ultrathin films in zero static applied magnetic field.

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Section: Introductionmentioning

confidence: 99%

“…We have recently created a beam of low-energy highly polarized radioactive 8 Li + for doing ␤-NMR. 5 Since only about 10 7 spins are needed to generate a signal, ␤-NMR is well suited for studies of dilute impurities, nanostructures or ultrathin films where there are a few host nuclear spins.…”

Section: Introductionmentioning

confidence: 99%

β-detected nuclear quadrupole resonance with a low-energy beam ofLi+8

et al. 2004

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“…III has also been used in 8 Li β-detected-NMR [57,58] measurements on a Nb thin film [141]. While the β-detected-NMR technique shares many similarities with and is complementary to LE-μSR [145], it has the advantage of being able to operate in (surface-parallel) magnetic fields up to 200 mT [146], covering the operating conditions of SRF cavities and close to Nb's B sh [50,51]. Although equivalent measurements using LE-μSR are not currently possible, the results presented here provide a good point of comparison for future investigations using β-detected NMR.…”

Section: Discussionmentioning

confidence: 99%

Depth-Resolved Measurements of the Meissner Screening Profile in Surface-Treated Nb

McFadden

Prokscha

et al. 2023

Phys. Rev. Applied

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We report depth-resolved measurements of the Meissner screening profile in several surface-treated Nb samples using low-energy muon spin rotation. In these experiments, implanted positive muons, whose stopping depths below Nb's surface are adjusted between approximately 10 nm and 150 nm, reveal the field distribution inside the superconducting element via their spin precession (communicated through their radioactive decay products). We compare how the field screening is modified by different surface treatments commonly used to prepare superconducting radio-frequency cavities used in accelerator beamlines. In contrast to an earlier report [A. Romanenko et al., Appl. Phys. Lett. 104, 072601 (2014)], we find no evidence for any "anomalous" modifications to the Meissner profiles, with all data being well described by a London model. Differences in screening properties between surface treatments can be explained by changes to the carrier mean free paths resulting from dopant profiles near the material's surface.

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“…(2). After many cycles of excitation and emission of the positive helicity photon, the resonant atoms are pumped toward increasing atomic (and nuclear) polarization; the majority occupy the jF 5∕2; m F 5∕2i state corresponding to the nuclear spin state m I 2, which is antiparallel to the beam momentum [19]. In the case of full polarization, P5∕2; 5∕2 1 and λ I 100%.…”

Section: Calculation Methodsmentioning

confidence: 99%

Effective collinear optical pumping for nuclear spin polarization

et al. 2014

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By numerically solving the density matrix equations, we show that the laser frequency ramping method by means of position-dependent Zeeman splitting can efficiently polarize nuclear spin of atoms/ions in an accelerator beamline. This minimizes a quantum phenomenon, coherent population trapping, which limits the optical pumping efficiency in the polarized beamline for radioactive nuclear spin polarization. We consider the 8 Li atomic system interacting with two circularly polarized laser beams in the presence of time-dependent magnetic field. From numerical results, we find that optimum frequency ramping allows efficient optical pumping for a short interaction time, e.g., 2 μs.

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Complementarity of low-energy spin polarized radioactive nuclei and muons

Cited by 8 publications

References 11 publications

β-detected nuclear quadrupole resonance with a low-energy beam ofLi+8

β-detected nuclear quadrupole resonance with a low-energy beam ofLi+8

Depth-Resolved Measurements of the Meissner Screening Profile in Surface-Treated Nb

Effective collinear optical pumping for nuclear spin polarization

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