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Angular correlation measurements in Te/sup 121/ and Te/sup 123/

Journal Article · · Phys. Rev.; (United States)
OSTI ID:6090889
;

Measurements of the angular correlation of the two-step transition in Te/sup 121/ and Te/sup 123/ have been made using a thin Te source (<1..mu..g/cm/sup 2/). K conversion electron-gamma, L conversion electron-gamma and K conversion-K conversion cascades were investigated in both isomers using a thin lens beta spectrometer as the fixed detector and scintillation counters for the movable detector. The measured correlation was found to be of the form 1 + A/sub 2/P/sub 2/ (cosTheta) in agreement with the theoretically predicted angular correlation for the known spin sequence in the tellurium isomers (11/2 ..-->.. 3/2 ..-->.. 1/2). The measured values of A/sub 2/ corrected for geometry are -0.097+/-0.004, -0.092+/-0.009, -0.06+/-0.03 for the K-..gamma.., L-..gamma.., and K-K cascades respectively in Te/sup 123/ and -0.015+/-0.007, -0.007+/-0.007, and -0.10+/-0.04 for the same cascades in Te/sup 121/. Comparison of the results of the K-..gamma.. cascades with theory shows that the second transition is a mixture of (1.3+/-0.1) percent E2 and 98.7 percent M1 in Te/sup 123/ and (5.6+/-0.5) percent E2 and 94.4 percent M1 in Te/sup 121/. The ratio of reduced matrix elements is plus in both cases using the Biedenharn and Rose notation. The results for the K-K angular correlation are consistent with the K-..gamma.. correlations and are used to prove that the correlations, which are smaller than the M4-M1 correlation, cannot result from reduction of the M4-M1 correlation by the action of extra-nuclear fields.

Research Organization:
Univ. of Pennsylvania, Philadelphia
OSTI ID:
6090889
Journal Information:
Phys. Rev.; (United States), Journal Name: Phys. Rev.; (United States) Vol. 100:5; ISSN PHRVA
Country of Publication:
United States
Language:
English

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Related Subjects

651722* -- Nuclear Properties &amp; Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CONVERSION
CORRELATIONS
DATA
DAYS LIVING RADIOISOTOPES
DECAY
E2-TRANSITIONS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GAMMA RADIATION
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
K CONVERSION
L CONVERSION
M1-TRANSITIONS
MULTIPOLE TRANSITIONS
NUCLEI
NUMERICAL DATA
RADIATIONS
RADIOISOTOPES
STABLE ISOTOPES
TELLURIUM 121
TELLURIUM 123
TELLURIUM ISOTOPES