On the investigation of the adiabatic and nonadiabatic reversal of the thermal neutron spin

Gul'ko, A.D.; Trostin, S. S.; Hudoklin, A.

doi:10.1016/0029-554x(65)90264-8

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…At low field strength, near zero, a rest asymmetry remains of at most about 20 ~ of the saturation value. This observation was also made by Gulko et al [8]. The result of direct T 1 measurements, shown in Fig.…”

Section: Dependence Of the Nuclear Polarization On The Static Magnetisupporting

confidence: 74%

“…For H o in the range between 1.6 and 6.5 kOe no statistically significant variation of 7'1 could be observed. Gulko et aL [7] had likewise measured the dependence of the fl decay asymmetry on H o and on the time t following the end of neutron irradiation for ~a~ (and 1~ too) in AgC1 at a fixed temperature of 4.2 K. To interprete their results they assumed the existence of two subsystems * The focusing action of H o enhances the solid angle of the fl detectors and consequently lowers the experimental asymmetry at high field strengths. In our case this effect was small and we did not have to correct for it.…”

Section: Dependence Of Fl Decay Asymmetry and Relaxation Time On The mentioning

confidence: 96%

“…In NMR experiments on neutron activated 8Li in LiF [8], 2~ in CaF 2 [8] and MgF 2 [3], 2SA1 in AlP [6] and 116In in the III-V compounds (Ref. I) the resonance effect on the nuclear polarization was about 100K in the first four cases and 50~ for 116In.…”

Section: Dependence Of the Nuclear Polarization On The Rf Powermentioning

confidence: 96%

“…The degree of polarization is reduced by the V deexcitation to the ground state. This reduction is the greater the smaller the compound spin Ic is and was estimated to be 50% for l~~ [8].…”

Section: Principles Of the Experimentsmentioning

confidence: 98%

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Relaxation and deorientation of110Ag(T 1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides

et al. 1973

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Polarized 11~ nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the 11 decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.

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Section: Dependence Of the Nuclear Polarization On The Static Magnetisupporting

confidence: 74%

Section: Dependence Of Fl Decay Asymmetry and Relaxation Time On The mentioning

confidence: 96%

Section: Dependence Of the Nuclear Polarization On The Rf Powermentioning

confidence: 96%

“…The degree of polarization is reduced by the V deexcitation to the ground state. This reduction is the greater the smaller the compound spin Ic is and was estimated to be 50% for l~~ [8].…”

Section: Principles Of the Experimentsmentioning

confidence: 98%

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