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.

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.

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.

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.

THE DECAY OF Re186 AND Re188

1956 ◽  
Vol 34 (1) ◽  
pp. 69-82 ◽  
Author(s):  
M. W. Johns ◽  
C. C. McMullen ◽  
I. R. Williams ◽  
S. V. Nablo
Keyword(s):  
High Resolution ◽  
Gamma Rays ◽  
Decay Scheme ◽  
Low Energy ◽  
End Points ◽  
Coincidence Measurements ◽  
Good Agreement

The energies and intensities of 13 gamma rays in Re188 have been measured by studying their external conversion spectra with a high resolution beta-ray spectrometer. An analysis of the beta-ray spectrum reveals groups with end points 2116 kev. (79%) and 1961 kev. (20%), and several low energy groups whose total intensity is of the order of 1%. The observed data can be consistently accounted for in terms of a decay scheme involving the following levels of OS188: 0.0, 155.0, 633, 1086, 1306, 1461, 1765, 1941, and 1958 kev. This scheme is firmly supported by coincidence measurements. The spins of the first three levels listed are 0+, 2+, and 2+ and that of the 1461 kev. level is probably 0+.The decay of Re186 is accompanied by gamma rays of the following energies and quantum intensities: 122.9 kev. (0.6%), 137.2 kev. (10%), 630.8 kev. (0.024%), and 768.2 kev. (0.024%). These values are in good agreement with those quoted in the literature, except for the intensities of the last two radiations.

A high-resolution system for particle-gamma coincidence measurements

1970 ◽  
Vol 146 (1) ◽  
pp. 26-32 ◽  
Author(s):  
J. Amezquita ◽  
C.P. Moore ◽  
K.P. Lieb ◽  
J.G. Kulleck ◽  
M. Koike ◽  
...  
Keyword(s):  
High Resolution ◽  
Resolution System ◽  
Gamma Coincidence ◽  
Coincidence Measurements

THE 51V(n, γ)52V REACTION

1967 ◽  
Vol 45 (8) ◽  
pp. 2683-2694 ◽  
Author(s):  
N. P. Archer ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Ground State ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Thermal Neutron Capture ◽  
Separation Energy ◽  
Direct Capture ◽  
Coincidence Measurements

The gamma radiation following thermal neutron capture by vanadium has been studied using a Ge(Li) detector. A separation energy of 7 311 ± 2 keV was determined and the ground-state triplet was observed, confirming levels of 17 and 23 keV. Coincidence measurements were used to assist in the construction of a decay scheme which includes 97% of the total observed intensity. The agreement with (d, p) measurements is very good and permits one to conclude that essentially all of the observed transitions are E1. The lack of any correlation between reduced radiation widths and stripping strengths suggests the absence of direct capture.

High energy levels of 144Nd excited in the decay of 144Pm

1968 ◽  
Vol 46 (19) ◽  
pp. 2189-2192 ◽  
Author(s):  
J. Barrette ◽  
S. Monaro ◽  
S. Santhanam ◽  
S. Markiza
Keyword(s):  
Excited States ◽  
Energy Levels ◽  
High Energy ◽  
Gamma Coincidence ◽  
Coincidence Measurements

Gamma–gamma coincidence measurements, carried out with a 7.6 cm × 7.6 cm NaI(Tl) crystal and a 30 cm3 Ge–Li detector, have been performed to look for excited states in 144Nd higher than the known level at 1789 keV. These measurements definitely establish the existence of a level at 2093.11 keV and suggest the placing of another level at 2204.74 keV. Furthermore, an E3 transition deexciting the 1510.14-keV level seems to be present.

The pre-equilibrium process of the 165Ho(α, xnyp) reaction at Eγ = 109 MeV studied by particle-gamma coincidence measurements

1985 ◽  
Vol 441 (3) ◽  
pp. 445-460 ◽  
Author(s):  
T. Shibata ◽  
K. Maeda ◽  
K. Okada ◽  
H. Ejiri ◽  
H. Sakai ◽  
...  
Keyword(s):  
Gamma Coincidence ◽  
Equilibrium Process ◽  
Coincidence Measurements

Study of thermal neutron capture in potassium

1970 ◽  
Vol 48 (10) ◽  
pp. 1109-1129 ◽  
Author(s):  
L. V. Johnson ◽  
T. J. Kennett
Keyword(s):  
Thermal Neutron ◽  
Excited States ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Gamma Ray ◽  
Branching Ratios ◽  
Experimental Results ◽  
Thermal Neutron Capture ◽  
Gamma Coincidence

The 39K(n,γ)40K reaction has been studied using a Ge(Li) and a Ge(Li)–Ge(Li) spectrometer. A total of 252 gamma-ray transitions has been observed and a gamma–gamma coincidence matrix involving 62 transitions has been established. A decay scheme based on the experimental results is deduced for 202 of the observed gamma-ray transitions. Spins and parities of some excited states have been estimated from the deduced branching ratios. The neutron separation energies of the 40K and 42K nuclei have been determined as 7800.5 ± 0.2 and 7535.2 ± 1.5 keV respectively.

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