Effect of Nuclear Electric Dipole Moments on Nuclear Spin Relaxation in Gases

Franken, P. A.; Boyne, H. S.

doi:10.1103/physrevlett.2.422

Cited by 3 publications

(3 citation statements)

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“…@le therefore define an angle-averaged current by to calculate the angle-averaged, second-order probability current . (2) We use (25), (26), (33), the b function in (35), and (39) where c.c. is the complex conjugate of the preceding expression.…”

Section: Modified Optical Theoremmentioning

confidence: 99%

“…Following the usual derivation of the distorted-wave Born approximation (DWBA) [31], we can find the zeroth-and first-order contributions to the scattering amplitude f We write the z. eroth-order wave function as the simple product of a spin function and a spatial function Physically, the term labeled l'lj in the sum (25) represents the scattering of the Lth partial wave of the incident beam into an outgoing spherical wave of angular momentum l'. At the same time, the tensor T~e nsures that the azimuthal quantum number of the particle's spin changes enough to conserve angular momentum.…”

Section: Modified Optical Theoremmentioning

confidence: 99%

“…In fact, the relaxation of a spin-1/2 gas has been considered as a candidate for a nuclear EDM search [24]. However, Purcell showed [24] that the standard simple estimate of the relaxation rate from an EDM [25] is many orders of magnitude too large because the electric field experienced by the nucleus in successive collisions is strongly correlated. As a result, the relaxation rate for our He cells is extremely insensitive to the existence of a nuclear EDM.…”

Section: Introductionmentioning

confidence: 98%

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Gaseous−33He magnetic dipolar spin relaxation

et al. 1993

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We derive the nuclear-spin-relaxation rate of gaseous He due to the magnetic-dipole interaction between the He nuclear spins. This dipolar relaxation rate is numerically evaluated for temperatures from 0.1 to 550 K. At room temperature, the relaxation time for a He density of 10 amagats is 74.4 h. We have made a series of high-density (4 -12 amagat) He samples for which nuclear relaxation is limited by the magnetic-dipole interaction. Both our theoretical and experimental results are particularly important for the growing use of He, polarized through spin exchange with optically pumped Rb vapor.PACS number(s): 34.50. Pi, 33.25.Bn, 32.80.Bx

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Section: Modified Optical Theoremmentioning

confidence: 99%

Section: Modified Optical Theoremmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Gaseous−33He magnetic dipolar spin relaxation

et al. 1993

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Nuclear Spin Relaxation and Nuclear Electric Dipole Moments

Purcell

1960

Phys. Rev.

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Proposals that nuclear spin relaxation in an appropriate system could serve as a test for the existence of a nuclear electric dipole moment are examined with attention to the consequences of the fact that the electric field at the nucleus is proportional to the nuclear acceleration. It is found that low-frequency fluctuations of the local electric field are suppressed. In particular, the necessarily negative correlation of the momentum transferred in consecutive collisions of an atom in a gas alters the spectral density of the perturbation, from that of uncorrected pulses, by the factor wVc 2 /(l+coV c 2 ), where r c is the mean time between collisions. It follows that fairly low gas density is preferable to high. At optimum density a light gas at room temperature carrying electric dipole moments of magnitude eX 10~1 4 cm should have a spin relaxation time, in the absence of competing processes, of around 10 minutes. A formula is given for the electrically induced spin relaxation rate in a crystal. The process is hopelessly slow. In the electric coupling of the lattice vibrations to the spin the ordinarily dominant "two-phonon" or "Raman" process is absent, because of the linearity of the connection between local electric field and nuclear .motion.

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