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Title: Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113

Abstract

A neutron-capture experiment on {sup nat}Cd has been carried out at DANCE. Multiple-fold coincidence {gamma}-ray spectra have been collected from J=0, 1 resonances in {sup 111}Cd and {sup 113}Cd. The cascades ending at the ground state can be described by the SLO model while the cascades ending at the 2+ states are better reproduced by the mixed SLO+KMF model.

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
NA-22
OSTI Identifier:
1049987
Report Number(s):
LA-UR-12-24329
TRN: US1204518
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: VIII TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS ; 2012-09-02 - 2012-09-07 ; Lenzkirch-Saig, Germany
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CAPTURE; GROUND STATES; NEUTRON REACTIONS; NUCLEAR PHYSICS; SPECTRA

Citation Formats

Rusev, Gencho Y. Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113. United States: N. p., 2012. Web.
Rusev, Gencho Y. Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113. United States.
Rusev, Gencho Y. Mon . "Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113". United States. doi:. https://www.osti.gov/servlets/purl/1049987.
@article{osti_1049987,
title = {Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113},
author = {Rusev, Gencho Y.},
abstractNote = {A neutron-capture experiment on {sup nat}Cd has been carried out at DANCE. Multiple-fold coincidence {gamma}-ray spectra have been collected from J=0, 1 resonances in {sup 111}Cd and {sup 113}Cd. The cascades ending at the ground state can be described by the SLO model while the cascades ending at the 2+ states are better reproduced by the mixed SLO+KMF model.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 27 00:00:00 EDT 2012},
month = {Mon Aug 27 00:00:00 EDT 2012}
}

Conference:
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  • In-vivo measurement of small quantities of Cd is possible due to the high radiative neutron-capture cross-section of /sup 113/Cd (12.3%, 20000 b). Under slow neutron capture in /sup 113/Cd, the excited /sup 114/Cd decays by prompt emission of cascade of gamma-rays of which the most intense is the 559 keV transition from the first excited state to the ground state. For a total kidney or liver dose of 670 mrem, the detection limits are 2.5 mg or 1.5 ..mu..g/g respectively. A table shows the results of a study on normal subjects with smoking and non-smoking history. The study indicates highermore » cadmium levels in the group of smokers. The method of measuring body N utilizes the /sup 14/N(n,..gamma..)/sup 15/N reaction. The total energy available on slow neutron capture is 10.83 MeV and approximately 15% of the de-excitations take place directly to the ground state of /sup 15/N. The irradiation facility is basically the same as that described for measurement of Cd. The Cd collimator, however is replaced by a second collimator designed to provide a wide beam 13 x 60 cm at the level of the bed. During the irradiation the subject lies on a motorized bed which moves across the neutron beam. The precision or reproducibility of the measurements was performed using an Alderson phantom. For a standard 70 kg man having 2000 g of N, the accuracy of the measurement is +-2% with an error of 1.3% for reproducibility, based on several measurements over a 6-month period. The total radiation dose for a bilateral irradiation is 45 mrem. Initial clinical studies will concentrate on sequential measurements of body N.« less
  • The capture gamma-ray spectrum of Cd/sup 113/(n, gamma )Cd/sup 114/ was investigated with the Argonne 7.7-m bent-crystal spectrometer. The observed spectrum consisted of 119 gamma rays with energies below 2 mev. These precision energy measurements were combined with a series of coincidence experiments to modify and extend the level scheme of Cd/sup 114/ The errors in the energy values of five previously observed levels are reduced by a factor of 10. Their new values are found to be 557.8 plus or minus 0.1, 1208.4 = 0.2, 1282.2 = 0.2, 1304.9 plus or minus 0.3, and 1362.9 = 0.3 kev. Fivemore » new levels are established at 1133.1 plus or minus 0.2, 1730.3 plus or minus 0.2, 1839.9 = 0.3, 1958.3 = 0.3, and 2202.4 plus or minus 0.3 Mev. Eight more levels are suggested at 1607.8 plus or minus 0.3, 2048.3 plus or minus 0.4, 2225.1 plus or minus 0.4, 2392.5 = 0.4, 2573.8 plus or minus 0.5, 2868.0 plus or minus 0.7, 3216.8; 0.8, and 3484.7 plus or minus 0.8 kev. The limits placed on the spins and parities of these levels by the observed capture gamma rays are discussed. (auth)« less
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  • A 350 gram sample of metallic cadmium (natural mixture of isotopes) was irradiated in a reactor with slow neutrons. A total of 132 lines was separated from the gamma spectrum. The energy and intensities of the line per neutron capture are presented. A cadmium oxide target 0.8 mg cm/sup -2/ thick, enriched with 85% Cd/sup 113/, was irradiated in order to obtain the internal electron conversion spectrum from 20 to 3000 kev on a magnetic spectrometer. The lntensity, internal conversion coefficient at the K-shell alpha /sub K/, and type of transition are listed for about 25 internal conversion electron lines.more » A diagram of the gamma transition of Cd/sup 114/ is given. On averaging the gamma energies for 60 different cascades, the binding energy of the last neutron in Cd/sup 114/ was found to be 9041 plus or minus 3 kev. The density of levels increased sharply above about 2.5 Mev. Five excitation levels were found at 1.1 to 1.4 Mev. A discussion of the population of various levels, and branching of lower levels is presented. (TTT)« less
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