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Title: Evaluated decay data for {sup 246}Cm.

Abstract

The Nuclear Data and Measurement Series document results of studies in the field of microscopic nuclear data. The primary objective is the dissemination of information in the comprehensive form required for nuclear technology applications. This Series is devoted to: (a) measured microscopic nuclear parameters, (b) experimental techniques and facilities employed in measurements, (c) the analysis, correlation and interpretation of nuclear data, and (d) the compilation and evaluation of nuclear data. Contributions to this Series are reviewed to assure technical competence and, unless otherwise stated, the contents can be formally referenced. This Series does not supplant formal journal publication, but it does provide the more extensive information required for technological applications (e.g., tabulated numerical data) in a timely manner.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
914958
Report Number(s):
ANL/NDM-164
TRN: US200817%%34
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
ENGLISH
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DECAY; NUMERICAL DATA; CURIUM 246; NUCLEAR DATA COLLECTIONS

Citation Formats

Kondev, F.G., and Nuclear Engineering Division. Evaluated decay data for {sup 246}Cm.. United States: N. p., 2007. Web. doi:10.2172/914958.
Kondev, F.G., & Nuclear Engineering Division. Evaluated decay data for {sup 246}Cm.. United States. doi:10.2172/914958.
Kondev, F.G., and Nuclear Engineering Division. Mon . "Evaluated decay data for {sup 246}Cm.". United States. doi:10.2172/914958. https://www.osti.gov/servlets/purl/914958.
@article{osti_914958,
title = {Evaluated decay data for {sup 246}Cm.},
author = {Kondev, F.G. and Nuclear Engineering Division},
abstractNote = {The Nuclear Data and Measurement Series document results of studies in the field of microscopic nuclear data. The primary objective is the dissemination of information in the comprehensive form required for nuclear technology applications. This Series is devoted to: (a) measured microscopic nuclear parameters, (b) experimental techniques and facilities employed in measurements, (c) the analysis, correlation and interpretation of nuclear data, and (d) the compilation and evaluation of nuclear data. Contributions to this Series are reviewed to assure technical competence and, unless otherwise stated, the contents can be formally referenced. This Series does not supplant formal journal publication, but it does provide the more extensive information required for technological applications (e.g., tabulated numerical data) in a timely manner.},
doi = {10.2172/914958},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 26 00:00:00 EST 2007},
month = {Mon Feb 26 00:00:00 EST 2007}
}

Technical Report:

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  • The fission cross sections of /sup 244/Cm, /sup 246/Cm and /sup 248/Cm have been measured from 0.1 to 80,000 eV using the Rensselaer Polytechnic Institute LINAC as a pulsed neutron source and the RINS spectrometer. Results were normalized to the /sup 235/U ENDF/B-V broad-bin-averaged fission cross section. Fission widths were determined for the resolved low-energy resonances. The ENDF/B-V evaluated fission cross section data for all three curium isotopes is generally in poor agreement with these measurements.
  • An evaluation of neutron cross sections for /sup 244/ /sup 246/ /sup 248/Cm using the ENDF/B format is presented. Primary data input included differential measurements, integral measurements, nuclear model calculations, and reactor production experience. (SDF)
  • Intense sources of $sup 246$Pu have been produced (through double neutron capture by $sup 244$Pu) for making detailed electromagnetic and conversion-electron measurements of the decay of $sup 246$Am/subm/ to levels of $sup 246$Cm. $gamma$ rays from $sup 246$Pu decaying to $sup 246$Am levels were identified in a chemical milking experiment. Of the 260 $sup 246$Cm $gamma$ rays observed, 97 are new and 64 have been assigned multipolarities from Si (Li) conversion-electron measurements. Some transitions were found to have strong E0 components, and two pure E0 transitions were observed. High-resolution $gamma$- $gamma$--time coincidence measurements were used to establish 54 levels, frommore » which the low-energy band structure of $sup 246$Cm was determined. The investigation confirmed previous assignments of K/sup pi/=0$sup -$, 1$sup -$, and 2$sup -$ octupole bands, and a K/sup pi/=0$sup +$ band at 1175 keV. We have also identified the probable K/sup pi/=3$sup -$ octupole band, and a second K/sup pi/ =0$sup +$ band at 1289 keV. The two K/sup pi/=0$sup +$ bands are discussed in terms of possible collective excitations. Other identified bands are discussed in terms of two-quasiparticle and multipole-phonon excitations. (AIP)« less