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Title: Prompt Neutron and Gamma-ray Correlations from Cf-252 Spontaneous Fission

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. University of Michigan
  2. Polytechnic of Milan, Milan,Italy
  3. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1369146
Report Number(s):
LA-UR-17-25336
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: IEEE Nuclear Science Symposium ; 2015-10-31 - 2015-10-31 ; San Diego, California, United States
Country of Publication:
United States
Language:
English
Subject:
Neutrons Gamma-Rays correlations 252Cf fission

Citation Formats

Marcath, Matthew, DiFulvio, Angela, Shin, Tony H., Clarke, Shaun D., Larsen, Edward W., Padovani, Enrico, Haight, Robert C., and Pozzi, Sara A.. Prompt Neutron and Gamma-ray Correlations from Cf-252 Spontaneous Fission. United States: N. p., 2017. Web. doi:10.1109/NSSMIC.2015.7581752.
Marcath, Matthew, DiFulvio, Angela, Shin, Tony H., Clarke, Shaun D., Larsen, Edward W., Padovani, Enrico, Haight, Robert C., & Pozzi, Sara A.. Prompt Neutron and Gamma-ray Correlations from Cf-252 Spontaneous Fission. United States. doi:10.1109/NSSMIC.2015.7581752.
Marcath, Matthew, DiFulvio, Angela, Shin, Tony H., Clarke, Shaun D., Larsen, Edward W., Padovani, Enrico, Haight, Robert C., and Pozzi, Sara A.. Wed . "Prompt Neutron and Gamma-ray Correlations from Cf-252 Spontaneous Fission". United States. doi:10.1109/NSSMIC.2015.7581752. https://www.osti.gov/servlets/purl/1369146.
@article{osti_1369146,
title = {Prompt Neutron and Gamma-ray Correlations from Cf-252 Spontaneous Fission},
author = {Marcath, Matthew and DiFulvio, Angela and Shin, Tony H. and Clarke, Shaun D. and Larsen, Edward W. and Padovani, Enrico and Haight, Robert C. and Pozzi, Sara A.},
abstractNote = {},
doi = {10.1109/NSSMIC.2015.7581752},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 05 00:00:00 EDT 2017},
month = {Wed Jul 05 00:00:00 EDT 2017}
}

Conference:
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  • An improved calculation is presented for the prompt fission neutron spectrum N(E) from the spontaneous fission of /sup 252/Cf. In this calculation the fission-spectrum model of Madland and Nix is used, but with several improvements leading to a physically more accurate representation of the spectrum. Specifically, the contributions to N(E) from the entire fission-fragment mass and charge distributions will be calculated instead of calculating on the basis of a seven- point approximation to the peaks of these distributions as has been done in the past. Therefore, values of the energy release in fission, fission-fragment kinetic energy, and compound nucleus crossmore » section for the inverse process will be considered on a point-by-point basis over the fragment yield distributions instead of considering averages of these quantities over the peaks of the distributions. Preliminary results will be presented and compared with a measurement, an earlier calculation, and a recent evaluation of the spectrum. 14 refs., 4 figs.« less
  • An improved calculation is presented for the prompt fission neutron spectrum N(E) from the spontaneous fission of /sup 252/Cf. In this calculation the fission-spectrum model of Madland and Nix is used, but with several improvements leading to a physically more accurate representation of the spectrum. Specifically, the contributions to N(E) from the entire fission-fragment mass and charge distributions will be calculated instead of calculating on the basis of a seven-point approximation to the peaks of these distributions as has been done in the past. Therefore, values of the energy release in fission, fission-fragment kinetic energy, nuclear level density, and compoundmore » nucleus cross section for the inverse process will be considered on a point-by-point basis over the fragment yield distributions instead of considering averages of these quantities over the peaks of the distributions. Particular attention will be given to the energy-dependent compound nucleus cross sections and to the nuclear level density model. Other refinements to the calculation of N(E) will also be discussed. Results will be presented and compared with earlier calculations of the spectrum and with recent experimental measurements of the spectrum. 9 figs.« less
  • Nuclear spectroscopy was performed on neutron-rich nuclides produced by the spontaneous fission process of {sup 252}Cf. The data were taken with the Compton-suppressed Ge-detector spectrometer at the Holifield Heavy Ion Research Facility. The prompt {gamma}-ray transitions were isolated by using {gamma}-{gamma} and {gamma}-{gamma}-{gamma} coincidence techniques. Nine new states were observed in {sup 110}Ru, four of which constitute a gamma band structure up to J{sup {pi}} = 7{sup +}, and an additional J{sup {pi}} = 12{sup +} state which was assigned to the yrast band. The level scheme of {sup 110}Ru is compared to {sup 104}Ru and {sup 192}Os, the lattermore » of which shares with {sup 110}Ru the distinction of having the lowest {gamma}-bandhead. Calculations with both the {gamma}-rigid triaxial nuclear model and the IBA 0(6) Hamiltonian gave acceptable fits for the yrast band, but predicted a doublet clustering of states for the {gamma}-band, which was not observed experimentally. Studies of nuclei around doubly magic {sup 132}Sn revealed for the first time energy levels of {sup 136}Te and new high spin states in {sup 134}Te, {sup 138,140}Xe, and {sup 140}Ba. The states in the yrast band of the N = 84 isotones {sup 136}Te, {sup 138}Xe, and {sup 140}Ba were determined up to 12{sup +}, 12{sup +} and 8{sup +}, respectively. The discovery of the 6{sup +} states provided an almost complete energy level systematics for the N = 84 isotones in the pseudospin {bar f}{sub 7/2} shell. The energy levels of the isotopes {sup 136}Te and {sup 138}Xe were shown to exhibit remarkable similarities to the isotopes {sup 204}Po and {sup 206}Rn. This approximate symmetry was ascribed to the underlying shell model structure. Based upon the shell model calculations for {sup 204}Po, the 8{sup +}, 10{sup +}, and 12{sup +} states of {sup 136}Te were hypothesized to involve core excitations of {sup 134}Sn. The higher spin states of the neutron-rich Pd isotopes {sup 110,112,114}Pd were identified.« less