THE DECAY OF Pm151

The radiations from Pm151 have been studied by external and internal conversion measurements and electron–electron, electron–beta, electron–gamma, and beta–gamma coincidence experiments. Thirty-six transitions have been identified. A decay scheme incorporating 30 of these has been established by energy and coincidence measurements with levels in Sm151 at 0, 0.0048, 0.0658, 0.0697, 0.0915, 0.1048, 0.1677, 0.1684, 0.2090, 0.3239, 0.3449, 0.4445, 0.741, and 0.821 Mev. The half-life of the 0.0048-Mev level is (19 ± 10) × 10−9 sec. The total decay energy is 1.195 ± 0.010 Mev.

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Decay of 185Os

Canadian Journal of Physics ◽

10.1139/p69-241 ◽

1969 ◽

Vol 47 (18) ◽

pp. 1899-1911 ◽

Cited By ~ 13

Author(s):

W. B. Cook ◽

M. W. Johns

Keyword(s):

Decay Scheme ◽

Internal Conversion ◽

Decay Energy ◽

Coincidence Experiment ◽

Coincidence Measurements ◽

Two Parameter

The energies and intensities of 10 transitions in 185Re following the decay of 185Os have been determined using Ge(Li) detectors and a magnetic beta-ray spectrometer. Internal conversion measurements made at a resolution of 0.15% in momentum have yielded the multipole character of the 9 strongest transitions. The proposed decay scheme has been tested by a two parameter γ–γ coincidence experiment. The decay energy has been found to be 1012 ± 3 keV from γ–X coincidence measurements involving the 646, 717, 875 + 880, and 931 keV transitions.

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Beta decay of 187W

Canadian Journal of Physics ◽

10.1139/p70-135 ◽

1970 ◽

Vol 48 (9) ◽

pp. 1040-1054 ◽

Cited By ~ 12

Author(s):

A. W. Herman ◽

E. A. Heighway ◽

J. D. MacArthur

Keyword(s):

Excited State ◽

Beta Decay ◽

Decay Scheme ◽

Decay Energy ◽

Beta Transition ◽

Point Energy ◽

Absolute Intensities ◽

Gamma Coincidence ◽

First Excited State ◽

Coincidence Measurements

Coincidence studies have established in the decay scheme of,187W the existence of transitions of energy 7, 36, 77, 455, 589, and 639 keV with intensities of 3.0 ± 0.5%, 0.50 ± 0.06%, 0.31 ± 0.07%, 0.05 ± 0.02%, 0.14 ± 0.04%, and 0.05 ± 0.02% respectively as well as yielding the absolute intensities of the well-known transitions in 187Re. In addition the beta–gamma coincidence measurements have shown that (1) a first-forbidden unique transition feeds the first-excited state of 187Re, (2) there is at most a very weak beta transition to the level at 512 keV, (3) there is no inner beta group of about 300 keV end-point energy and intensity 8% as indicated by several earlier investigations, and (4) the decay energy of 187W to 187Re is 1311 ± 2 keV. The relevance of these observations to the structure of 187Re is discussed.

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DIRECTIONAL CORRELATIONS IN 127I

Canadian Journal of Physics ◽

10.1139/p66-110 ◽

1966 ◽

Vol 44 (6) ◽

pp. 1313-1320 ◽

Cited By ~ 6

Author(s):

J. F. Neeson ◽

J. P. Roalsvig ◽

R. G. Arns

Keyword(s):

Correlation Functions ◽

Decay Scheme ◽

Short Discussion ◽

Gamma Coincidence ◽

Decay Sequence ◽

Spin Sequence ◽

Coincidence Measurements

Gamma–gamma coincidence measurements on the decay of 9.3-hour 127Te to 127I form the basis of the decay scheme presented, which confirms the accepted decay sequence. Directional correlation measurements have been made on the 215–203 keV and 360–58 keV cascades. The respective correlation functions are:[Formula: see text]The directional correlation results have been interpreted in terms of the accepted spin sequence, and limits of multipole mixtures are presented. A short discussion of the collective properties of the levels is presented.

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THE DECAY OF Os191 AND Os193

Canadian Journal of Physics ◽

10.1139/p58-141 ◽

1958 ◽

Vol 36 (10) ◽

pp. 1409-1429 ◽

Cited By ~ 35

Author(s):

S. V. Nablo ◽

M. W. Johns ◽

R. H. Goodman ◽

A. Artna

Keyword(s):

Excited States ◽

Gamma Rays ◽

Cross Sections ◽

Decay Scheme ◽

Internal Conversion ◽

Gamma Ray ◽

Internal Conversion Coefficients ◽

Gamma Coincidence ◽

Conversion Coefficients ◽

Activation Cross Sections

The beta- and gamma-ray spectra of Os191 and Os193 have been studied with a magnetic beta-ray spectrometer, scintillation spectrometers, and coincidence circuits. The 14-hour isomer of Os191 decays via a 0.0742-Mev (M3) transition. Gamma rays of energy 0.0418 (100%, E3), 0.0809 (1%, M1 + E2), 0.1287 (100%, M1 + E2), and 0.1858 (0.1%) Mev have been found to be associated with the 14.6 ± 0.3 day decay of Os191 and an extension of the accepted decay scheme proposed. The following 19 transitions have been associated with the 31.5 ± 0.5 hour decay of Os193: 0.0730 (14%), 0.1068 (~1%), 0.1393 (10%), 0.180 (0.3%), 0.196 (0.1%), 0.243 (~0.2%), 0.2485 (0.3%), 0.2514 (0.4%), 0.278 (0.6%), 0.2810 (1.6%), 0.2885 (0.3%), 0.2994 (0.4%), 0.314 (0.3%), 0.3218 (1.7%), 0.3620 (0.6%), 0.3878 (1.6%), 0.4604 (4.1%), 0.4857 (0.3%), and 0.5585 (2.2%). The internal conversion coefficients for all the stronger transitions suggest that they are M1 + E2 in character. The decay energy of Os193 is 1.132 ± 0.005 Mev. Fermi analyses and beta–gamma coincidence experiments have established excited states of Ir193 at 0.073, 0.139, 0.281, 0.362, 0.460, and 0.559 Mev above the ground state. Six otherwise unclassified weak gamma rays can be accommodated if levels at 0.247, 0.315, and 0.613 Mev are included in the decay scheme.The activation cross sections of Os184 and Os190 are (2.2 ± 0.5) × 103and 5.3 ± 2 barns respectively, relative to Seren's value of 1.6 ± 0.4 barns for Os192.

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THE DECAY OF Sb125

Canadian Journal of Physics ◽

10.1139/p64-156 ◽

1964 ◽

Vol 42 (9) ◽

pp. 1700-1715 ◽

Cited By ~ 16

Author(s):

K. C. Mann ◽

F. A. Payne ◽

R. P. Chaturvedi

Keyword(s):

Conversion Electron ◽

Decay Scheme ◽

Internal Conversion ◽

Supporting Evidence ◽

Spin Parity ◽

Considerable Fraction ◽

Gamma Coincidence ◽

Self Consistent ◽

Gamma Radiations

The beta, internal-conversion, and gamma radiations of Sb125–Te125 have been examined with magnetic and scintillation spectrometers, and by means of beta–gamma and conversion electron–gamma coincidence techniques. The results lead to self-consistent transition intensities, and completely support the decay scheme and spin–parity assignments of Narcisi (1958). There is evidence that a considerable fraction of the 633-keV radiation may originate at the 668-keV level. There is also supporting evidence for the 62-keV transition reported by Chandra and Pandharipande (1963).

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