MEASUREMENTS OF SOME GAMMA-RAY RELATIVE INTENSITIES AND INTERNAL CONVERSION COEFFICIENTS USING A BENT-CRYSTAL MONOCHROMATOR.

High spin slates in 148Tb have been excited by means of 144Sm(6Li,2n), 144Sm(7Li,3n), and 142Nd(10B,4n) reactions and studied by γ-ray and electron measurements. Gamma-ray singles, excitation functions, angular distributions, internal conversion coefficients, and γ–γ coincidence measurements have been made. A seven-fold gamma–gamma cascade feeding the 9+ isomeric state in 148Tb and originating in a level 4137 keV above that state is strongly excited. The spin and parity assignments are made on the basis of angular distribution and internal conversion coefficients. On the basis of these measurements, the 1006 keV transition is E3 in character; the half-life of the 1006 keV (12−) level is established to be 25 ± 2 ns.These experiments also confirm the existence of a number of high spin states in 148Gd seen by earlier workers.

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Band structures in 95Tc

Canadian Journal of Physics ◽

10.1139/p78-018 ◽

1978 ◽

Vol 56 (1) ◽

pp. 117-126 ◽

Cited By ~ 7

Author(s):

K. A. Marshall ◽

J. V. Thompson ◽

W. B. Cook ◽

M. W. Johns

Keyword(s):

Angular Distribution ◽

Internal Conversion ◽

Gamma Ray ◽

Distribution Functions ◽

Angular Distributions ◽

High Momentum ◽

Internal Conversion Coefficients ◽

Conversion Coefficients ◽

Proton Induced Reaction ◽

Induced Reaction

The (α,2nγ) reaction has been used to study high momentum states in 95Tc. Gamma ray singles excitation functions, angular distribution functions, γ–γ coincidence probabilities, and internal conversion coefficients were determined for a large number of transitions. In addition to a number of low spin levels that are strongly populated in proton induced reaction, the alpha induced reaction populates a positive parity sequence levels at 882 (13/2), 857 (11/2), 1516 (17/2), 1550 (15/2), 2184 (19/2), 2548 (21/2), 2908 (23/2), 3517 (25/2), 3919 (29/2), and 4293 (27/2) keV together with a negative sequence of levels at 39 (1/2), 668 (5/2), 1214 (9/2), 1702 (13/2), 2213 (17/2), 3024 (21/2), 3822 (25/2), 4128 (27/2, 29/2), and 4972 (29/2). The spins are assigned on the basis of internal conversion measurements and angular distributions.

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High-resolution gamma-ray study of 185Wm

Canadian Journal of Physics ◽

10.1139/p70-067 ◽

1970 ◽

Vol 48 (5) ◽

pp. 502-510 ◽

Cited By ~ 11

Author(s):

S. C. Gujrathi ◽

J. M. D'auria

Keyword(s):

High Resolution ◽

Gamma Rays ◽

Ground State ◽

Internal Conversion ◽

Gamma Ray ◽

X Ray ◽

Isomeric Level ◽

Coincidence System ◽

Internal Conversion Coefficients ◽

Conversion Coefficients

The decay of 185Wm has been investigated using a high-resolution Ge(Li) X-ray spectrometer and a Ge(Li)–NaI(Tl) coincidence system. The energies and relative intensities (given in parentheses) of the observed gamma rays associated with the decay of the 185Wm (T1,2 = 1.68 min) are: 23.54 (3.3), 42.29 (1.1), 65.857 (100), 93.30 (0.5), 94.59 (2.2), 107.850 (6.8), 122.05 (1.5), 131.554 (84.0), 164.334 (11), 173.675(61.5),and 187.879(15.4) keV. The energy of the isomeric level has been deduced to be 197.41 keV and decays to the ground state through levels at 187.88, 173.68, 93.29, 65.86, and 23.54 keV. In addition, it was deduced experimentally from measured internal-conversion coefficients that the multipolarity of the 131.55 keV transition is E3 while the 65.86 keV transition is an M1 + E2 mixture with a 30 ± 7.5% M1 component.

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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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Levels populated in 193Ir from the beta decay of 193Os

Canadian Journal of Physics ◽

10.1139/p69-093 ◽

1969 ◽

Vol 47 (7) ◽

pp. 727-746 ◽

Cited By ~ 19

Author(s):

R. H. Price ◽

M. W. Johns ◽

N. M. Ahmed ◽

E. E. Habib

Keyword(s):

Beta Decay ◽

Internal Conversion ◽

Gamma Ray ◽

Magnetic Spectrometer ◽

Mixing Ratios ◽

Internal Conversion Coefficients ◽

Conversion Coefficients ◽

Coincidence Measurements

The beta and gamma ray transitions involved in the decay of 193Os have been studied using Ge(Li) and Nal(Tl) detectors and magnetic spectrometers, singly and in coincidence. Fifty-four gamma ray transitions have been observed and all but one classified on the basis of energy fit and β−γ and γ−γ coincidence measurements. The internal conversion coefficients of 25 of the stronger transitions were determined with a magnetic spectrometer operating at a resolution of ~0.1% in momentum, and multipole mixing ratios determined. The energies and spins of levels in 193Ir have been determined as follows: 0 (3/2+), 73.006 (1/2+), 138.887 (5/2+), 142.125 (+), 180.00(3/2+), 357.7 (7/2+), 361.79 (5/2+), 440.95 (+), 460.46 (3/2+), 557.29 (1/2+), 559.22 (5/2+), 660.09 (+), 667.13, 695.06 (3/2+), 712.08 (3/2+), 778.50,784.13, 848.94, 874.45, 891.57.

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