In situ NMR/ON on 197mHg implanted at T&lt;0.5 K in iron

Herzog, P.; Folle, H. R.; Freitag, Κ.; Reuschenbach, M.; Schmidt, Helmut

doi:10.1016/0375-9601(77)90785-x

Cited by 14 publications

(2 citation statements)

References 4 publications

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“…Consequently regarding this possible systematic error our quadrupole moment represents an upper limit of the true value. We assume that this effect is smaller than the quoted error, because at the temperatures during the implantations and NO experiments lattice defects are not mobile and can therefore not be trapped by the probe ion [15].…”

Section: Experiments and Resultsmentioning

confidence: 95%

Nuclear orientation of111m Cd in Zn and Be and the quadrupole moment of the 245keV state

et al. 1980

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The 48.7m 111"Cd activity was implanted in Zn and Be single crystals which were soldered to the cold finger of a dilution refrigerator and kept below 0.2 K during implantation. Subsequent nuclear orientation experiments allowed the determination of the quadrupole interaction frequency vQ of the 11/2-isomeric state of 111Cd in Zn and Be as -139(15)MHz and +43(16)MHz respectively. With these results we derive the quadrupole moment of the 5/2 + 245 keV level of 111Cd including sign as Q = +0.83 (13) b and the sign of the electric field gradient for Cd in Be. The half-life of 11~'~Cd was redetermined as 48.67 (6) m.

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Section: Experiments and Resultsmentioning

confidence: 95%

Nuclear orientation of111m Cd in Zn and Be and the quadrupole moment of the 245keV state

et al. 1980

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“…Many experiments have demonstrated that this implantation energy is adequate to describe the environment of the implants as fully typical of the metal. In the context of low temperature nuclear orientation evidence comes from the fact that Nuclear Magnetic Resonance (NMR) of the implants has been observed at the same frequencies in implanted samples as in samples prepared by thermal diffusion to depths of ∼1 micron [14]. Additional evidence of the implants being in true metallic lattice is the fact that the implanted nuclei have been observed to relax in on-line implantation experiments with time constants T 1 described fully by the Korringa conduction electron mechanism [15].…”

Section: Implanted Metallic Sample Preparation For Ltno Alpha Animentioning

confidence: 99%

On the absence of appreciable half-life changes in alpha emitters cooled in metals to 1 Kelvin and below

Stone¹,

Stone²,

Lindroos³

et al. 2007

Nuclear Physics A

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The recent suggestion that dramatic changes may occur in the lifetime of alpha and beta decay when the activity, in a pure metal host, is cooled to a few Kelvin, is examined in the light of published low temperature nuclear orientation (LTNO) experiments on such sources cooled to as low as 25 mK, with emphasis here on alpha decay. In LTNO observations are made of the anisotropy of radioactive emissions with respect to an axis of orientation. Correction of data for decay of activities in metallic samples held at temperatures at and below 1 Kelvin for periods of several days has been a routine element of LTNO experiments for many years. No evidence for any change of half-life on cooling, with an upper level of order 1%, has been found, in striking contrast to the predicted changes, for alpha decay, of several orders of magnitude. The proposal that such dramatic changes might alleviate problems of disposal of long-lived radioactive waste is shown to be unrealistic.

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Recent developments in radiative detection of nuclear magnetic resonance

Brewer

1982

Hyperfine Interact

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In situ NMR/ON on 197mHg implanted at T<0.5 K in iron

Cited by 14 publications

References 4 publications

Nuclear orientation of111m Cd in Zn and Be and the quadrupole moment of the 245keV state

Nuclear orientation of111m Cd in Zn and Be and the quadrupole moment of the 245keV state

On the absence of appreciable half-life changes in alpha emitters cooled in metals to 1 Kelvin and below

Recent developments in radiative detection of nuclear magnetic resonance

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