Beta decay of 187W

1970 ◽  
Vol 48 (9) ◽  
pp. 1040-1054 ◽  
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.

THE DECAY OF Pm151

1963 ◽  
Vol 41 (1) ◽  
pp. 57-82 ◽  
Author(s):  
D. G. Burke ◽  
M. E. Law ◽  
M. W. Johns
Keyword(s):  
Half Life ◽  
Decay Scheme ◽  
Internal Conversion ◽  
Decay Energy ◽  
Gamma Coincidence ◽  
Coincidence Measurements

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.

Decay of 185Os

1969 ◽  
Vol 47 (18) ◽  
pp. 1899-1911 ◽  
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.

DIRECTIONAL CORRELATIONS IN 127I

1966 ◽  
Vol 44 (6) ◽  
pp. 1313-1320 ◽  
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.

Indication of Neutrinoless Double Beta Decay of 76Ge to the First Excited State of 76Se. Results of the Frejus Experiment

1988 ◽  
pp. 220-224
Author(s):  
J. Busto ◽  
J. Chevallier ◽  
D. Dassié ◽  
Ph. Hubert ◽  
A. Larrea ◽  
...  
Keyword(s):  
Excited State ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
First Excited State

scholarly journals New limit for the half-life of double beta decay of 94Zr to the first excited state of 94Mo

2017 ◽  
Vol 53 (4) ◽  
Author(s):  
N. Dokania ◽  
V. Nanal ◽  
G. Gupta ◽  
S. Pal ◽  
R. G. Pillay ◽  
...  
Keyword(s):  
Excited State ◽  
Beta Decay ◽  
Half Life ◽  
Double Beta Decay ◽  
First Excited State

Nuclear alinement of manganese-56

1959 ◽  
Vol 250 (1263) ◽  
pp. 550-561 ◽  
Keyword(s):  
Angular Distribution ◽  
Excited State ◽  
Angular Correlation ◽  
Excited States ◽  
Daughter Nucleus ◽  
Γ Radiation ◽  
Mixing Ratios ◽  
First Excited State ◽  
Γ Rays ◽  
Coincidence Measurements

The present work demonstrates the feasibility of alining manganese-56 produced by neutron irradiation of a nickel fluosilicate crystal containing stable 55 Mn. Measurements were made of the angular distribution of the γ-radiation from the alined 56 Mn and also of the angular correlation of the γ-rays from this isotope. By combining the results it is possible to establish uniquely as 2 the spins of the states of the daughter nucleus of 56 Fe at 2.66 and 2.98 MeV. The mixing ratios δ ( E 2/ M 1) for the 1.81 and 2.13 MeV γ-rays to the first excited state are shown to be 0.19 ± 0.02 and — 0.28 ± 0.02. The spectrum of the γ-radiation was studied with a scintillation spectrometer and this leads to the following relative intensities; 0.845 MeV (100%), 1.81 MeV (27 ± 3%), 2.13 MeV (15 ± 3%), 2.55 MeV (1.2 ± 0.2%), 2.66 MeV (0.65 ± 0.1%), 2.98 MeV (0.35 ± 0.1%) and 3.4 MeV (0.22 ± 0.05%). Coincidence measurements suggest that the 2.55 and 3.4 MeV γ-rays are due to de-excitation of a level at about 3.4 MeV which decays both to the ground and first excited states. A spin of 2 for this state is proposed.

STUDIES IN THE ACTIVE DEPOSIT OF ACTINIUM: PART II: THE DECAY OF 211Pb (AcB)

1965 ◽  
Vol 43 (3) ◽  
pp. 383-403 ◽  
Author(s):  
C. R. Cothern ◽  
R. D. Connor
Keyword(s):  
Gamma Rays ◽  
Level Scheme ◽  
Gamma Ray ◽  
Ground Level ◽  
Conversion Line ◽  
Point Energy ◽  
Correlation Studies ◽  
Absolute Intensities ◽  
Gamma Coincidence ◽  
Conversion Coefficients

Studies of the active deposit of actinium using a Siegbahn–Slatis beta-ray spectrometer and scintillation counters together with gamma–gamma coincidence work and gamma–gamma angular correlation measurements have led to the establishment of a new decay scheme for 211Pb and a level scheme for 211Bi involving five excited states.The gamma rays have the following energies and absolute intensities:[Formula: see text]Conversion-line studies yielded energy values for the transitions marked with an asterisk as 403.3 ± 0.5 and 426.5 ± 0.5 keV respectively. The K conversion coefficients of the 400- and 430-keV transitions have been determined as 0.091 ± 0.018 and 0.117 ± 0.024 respectively.Fermi analysis yields 1.378 MeV as the highest end-point energy of the beta partial spectra. The remaining end points and the component intensities as deduced from the level scheme are as follows:[Formula: see text]The much less accurate results from Fermi analysis of the complete active deposit are in reasonable agreement with these data.Angular correlation studies of the 430–400- and 706–400-keV gamma-ray cascades have yielded spins for the levels concerned: ground level (9/2), 400-keV level (7/2), 830-keV level (9/2), and 1 100-keV level (7/2). These spins are the only ones consistent with the experimental evidence and the theoretical arguments presented.

Coincidence measurements of the first excited state of 73Ge

1970 ◽  
Vol 48 (8) ◽  
pp. 930-934 ◽  
Author(s):  
D. G. Douglas
Keyword(s):  
Excited State ◽  
Half Life ◽  
Conversion Coefficient ◽  
Coincidence Measurement ◽  
First Excited State ◽  
Coincidence Measurements

A coincidence measurement of the K conversion coefficient of the 13.26 keV transition from the first excited state of 73Ge yields a result closer to the E2 theoretical value than that of an earlier less-precise measurement.The half-life of the level is found to be 2.95 ± 0.05 s in agreement with one of two disagreeing previous values.

Beta decay of12B and12N to the first excited state of12C (4.44 MeV)

1981 ◽  
Vol 301 (2) ◽  
pp. 183-188 ◽  
Author(s):  
W. Kaina ◽  
V. Soergel ◽  
W. Trost ◽  
G. Zinser
Keyword(s):  
Excited State ◽  
Beta Decay ◽  
First Excited State

Observation of the 2159-keV level in 60Ni following the beta decay of 60Co

1970 ◽  
Vol 48 (5) ◽  
pp. 483-488 ◽  
Author(s):  
W. R. Dixon ◽  
R. S. Storey
Keyword(s):  
Excited State ◽  
Beta Decay ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Escape Peak ◽  
First Excited State

A search has been made with a Ge(Li) detector for weak gamma-ray transitions in 60Ni following the beta decay of 60Co. Observation of a gamma ray of energy 2158.8 ± 0.4 keV and intensity of about 10−5 per disintegration has confirmed that the 2159-keV level of 60Ni is populated in about 10−4 of the disintegrations. A much stronger peak at 822 keV has been shown to be the single-escape peak of the 1332-keV gamma ray rather than the (2159 → 1332) transition as claimed by Hansen and Spernol. The search for other weak gamma rays in 60Ni was inconclusive, and the mechanism for feeding the 2159-keV level is not clear. As a byproduct of this investigation, the energy of the first excited state of 64Ni is found to be 1345.9 ± 0.3 keV.

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