scholarly journals Nuclear orientation of 206Bi in nickel

1977 ◽  
Vol 55 (5) ◽  
pp. 456-462 ◽  
Author(s):  
P. R. H. McConnell ◽  
P. W. Martin ◽  
B. G. Turrell
Keyword(s):  
Hyperfine Field ◽  
Isomeric State ◽  
Low Temperatures ◽  
Nuclear Orientation ◽  
Attenuation Coefficients ◽  
Mixing Ratios

A study of the 206Pb decay was performed by nuclear orientation of 206Bi nuclei in a nickel host at low temperatures. The hyperfine field of 206Bi/Ni was determined to be 400 ± 34 kG, with 65% of the bismuth nuclei occupying lattice sites. Mixing ratios were determined for several transitions in the 206Pb decay. Attenuation coefficients due to reorientation effects in the isomeric state at 2200 keV excitation in 206Pb were measured.A discussion of the reasons for fractional occupation of lattice sites by the bismuth nuclei is given.

Nuclear g factors of three levels of 192Pt

1969 ◽  
Vol 47 (21) ◽  
pp. 2395-2399 ◽  
Author(s):  
D. B. Kenyon ◽  
L. Keszthelyi ◽  
J. A. Cameron
Keyword(s):  
Hyperfine Field ◽  
Angular Correlation ◽  
Iron Alloy ◽  
Scintillation Detectors ◽  
Angular Correlations ◽  
Mixing Ratios ◽  
G Factors

The g factors of the 316, 612, and 785 keV levels of 192Pt have been measured using gamma–gamma angular correlations perturbed by the hyperfine field in an iron alloy. Sources were 192Ir in 1 at.% Ir Fe alloy. Coincidences were observed using a combination of Ge(Li) and scintillation detectors. For the three levels, the g factors obtained were[Formula: see text]In addition, the E2/M1 mixing ratios were obtained from the angular correlation measurements.[Formula: see text]

The determination of hyperfine interaction fields in neutron irradiated cobalt by nuclear orientation techniques

1967 ◽  
Vol 296 (1444) ◽  
pp. 71-81
Keyword(s):  
Excited State ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Hyperfine Field ◽  
Thermal Neutron ◽  
Nuclear Orientation ◽  
Cobalt Atom ◽  
Interaction Field ◽  
Thermal Neutron Irradiation

The hyperfine interaction field on 60 Co nuclei formed by thermal neutron irradiation of a single crystal of hexagonal cobalt at 4°K was determined from measurements of the anisotropy of γ -radiation emitted when the sample was cooled to about 0·012°K. These measurements were repeated after the sample had been annealed successively at 20, 77 and at 300°K. A reduction of (6 ± 4) % in the hyperfine field on the 60 Co nuclei was observed after annealing out the radiation damage. This result is discussed in terms of the positions in the lattice which might be occupied by a cobalt atom after the recoil caused by the γ -decay of the 8 MeV excited state of a 60 Co nucleus immediately after its formation.

On the magnetic hyperfine field at Hf in iron and the gyromagnetic factors g K and g R of the 624 rotational band of 177 Hf

1969 ◽  
Vol 311 (1504) ◽  
pp. 181-184 ◽  
Keyword(s):  
Hyperfine Field ◽  
Rotational Band ◽  
Ground State ◽  
Magnetic Hyperfine Field ◽  
Excited Level ◽  
Internal Field ◽  
Magnetic Hyperfine ◽  
Iron Foil ◽  
Mixing Ratios ◽  
A Value

The induced magnetic hyperfine field acting on 177 Hf nuclei implanted into an iron foil by means of an isotope separator was determined by measuring the integral rotation of the 208-113 keV γ-γ directional correlation. By using the previously known values of the g factor and the lifetime of the 113 keV state of 177 Hf a value of - (286 ± 40) kOe was obtained for the effective internal field. The same source was used to measure the g factor of the 321 keV excited level in 177 Hf, which is the ground state of the K = 9/2 + [624] rotational band. The measurement of the integral rotation of the 105-208 keV cascade yielded the value of g (321) = -0.113 ± 0.038. The combination of the g factor and the M 1/ E 2 mixing ratios of the Δ I = 1 transitions in the [624] rotational band in 177 Hf, which were determined from directional correlation measurements employing Ge(Li) detectors, gave g K = -0.18 ± 0.05 and g R = 0.19 ± 0.05.

Hyperfine field andbeta-decay of142Pr in PrNi studied by low temperature nuclear orientation

1993 ◽  
Vol 78 (1-4) ◽  
pp. 153-157 ◽  
Author(s):  
K. Nishimura ◽  
I. S. Oliveira ◽  
N. J. Stone ◽  
Y. Isikawa ◽  
K. Shimizu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hyperfine Field ◽  
Nuclear Orientation

Experiments on nuclear orientation at very low temperatures I, Establishment of a method of nuclear alinement and its application to cobalt-60

1954 ◽  
Vol 221 (1145) ◽  
pp. 170-188 ◽  
Keyword(s):  
Hyperfine Structure ◽  
Single Crystals ◽  
Magnetic Moment ◽  
Low Temperatures ◽  
Unknown Parameter ◽  
Nuclear Orientation ◽  
Magnetic Hyperfine ◽  
A Value ◽  
Adiabatic Demagnetization ◽  
Magnetic Hyperfine Structure

Experiments have been carried out which demonstrate the possibilities of the method of ‘magnetic hyperfine-structure alinement’ for the orientation of nuclei. Single crystals of composition (1% Co, 12% Cu, 87% Zn) Rb 2 (SO 4 ) 2 , 6H 2 O were cooled by adiabatic demagnetization to 0·01°K. The crystals contained a small quantity of radioactive 60 Co, which decays by β -emission followed by two γ -rays in cascade. The anisotropic distribution of the γ -rays from the oriented 60 Co nuclei was measured by an array of Geiger counters around the cryostat. The largest anisotropy observed was 33%, and the change in this anisotropy as the crystals warmed up to 1°K was fitted to theoretical curves where the only unknown parameter was the magnetic moment of 60 Co, for which a value of 3·5 ± 0·5 nuclear magnetons was deduced.

scholarly journals Nuclear Orientation of 152Eu in Gold

1983 ◽  
Vol 36 (2) ◽  
pp. 127 ◽  
Author(s):  
PJ Blamey ◽  
D Bingham ◽  
JA Barclay ◽  
JD Cashion
Keyword(s):  
Hyperfine Interaction ◽  
Angular Correlation ◽  
Decay Scheme ◽  
Nuclear Orientation ◽  
Temperature Range ◽  
Mixing Ratios ◽  
Gamma Transitions

Nuclear orientation of 152Eu in gold in the temperature range 9 mK-1 K has been used to determine the mixing ratios of a number of gamma transitions and the multipolarities of several beta transitions of the 152Eu decay scheme. The results agree closely with those from y-y and y-p angular correlation measurements where these have been done. Our results on the" hyperfine interaction of 152Eu in gold contradict those previously published.

Sign in / Sign up

Export Citation Format

Share Document