Ν. Fotiades
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View article: Orientation dependence in molecular dynamics simulations of shocked single crystals
Orientation dependence in molecular dynamics simulations of shocked single crystals Open
The entry distribution in angular momentum and excitation energy for the formation of 254No has been measured after the 208Pb\(48Ca,2n\) reaction at 215 and 219 MeV. This nucleus is populated up to spin 22h and excitation energy >˜6 MeV ab…
View article: Experimental Prompt Fission Neutron Spectra Comparisons for the <sup>235,238</sup>U(<i>n, f</i>) and <sup>239</sup>Pu(<i>n, f</i>) Reactions
Experimental Prompt Fission Neutron Spectra Comparisons for the <sup>235,238</sup>U(<i>n, f</i>) and <sup>239</sup>Pu(<i>n, f</i>) Reactions Open
The Chi-Nu project to measure prompt fission neutron energy spectra for the major actinides has now completed two measurements, for neutron-induced fission of 239 Pu and 235 U for incident neutron energies from 1 to 20 MeV, and has almost …
View article: Measurement of the $^{239}$Pu(n,f)/$^{235}$U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber
Measurement of the $^{239}$Pu(n,f)/$^{235}$U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber Open
The $^{239}$Pu(n,f)/$^{235}$U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides three-dimensional reconstruction of fission-fragment ionization…
View article: Measurement of material isotopics and atom number ratio with alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber actinide target
Measurement of material isotopics and atom number ratio with alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber actinide target Open
We present the results of a measurement of isotopic concentrations and atomic number ratio of a double-sided actinide target with alpha-spectroscopy and mass spectrometry. The double-sided actinide target, with primarily Pu-239 on one side…
View article: Isotopically resolved neutron total cross sections at intermediate energies
Isotopically resolved neutron total cross sections at intermediate energies Open
The neutron total cross sections σtot of 16,18O, 58 64Ni, 103Rh, and 112,124Sn have been measured at the Los Alamos Neutron Science Center from low to intermediate energies (3 ≤ Elab ≤ 450 MeV) by leveraging wave-form-digitizer technology.…
View article: High-spin phenomena in 194Hg
High-spin phenomena in 194Hg Open
High-spin states in the isotope 194Hg were populated using the 150Nd(40Ca,4n) reaction at a beam energy of 213 MeV. The analysis of γ-γ coincidences, which were detected using the EUROGAM detector array, has revealed two new structures at …
View article: High Spin States in 193Hg
High Spin States in 193Hg Open
The high-spin structure of 193Hg was investigated by in-beam γ-ray spectroscopic techniques. The tandem accelerator at Daresbury Laboratory, U. K., was used to populate excited states of 193Hg through the reaction 150Nd(48Ca,5n)193Hg at a…
View article: Using CGMF to estimate corrections for fission yields measured via <i>γ</i>-ray spectroscopy
Using CGMF to estimate corrections for fission yields measured via <i>γ</i>-ray spectroscopy Open
Fission product yields have been inferred using γ -ray spectroscopy for several decades. Typically, these efforts have focused on even-Z even-A fission products as their nuclear structure are less complicated. To further simplify the situa…
View article: Prompt Fission Neutron Spectra for Neutron-Induced Fission of <sup>239</sup>Pu and <sup>235</sup>U
Prompt Fission Neutron Spectra for Neutron-Induced Fission of <sup>239</sup>Pu and <sup>235</sup>U Open
We report the current results of a large effort to accurately measure the Prompt Fission Neutron Spectra (PFNS) for neutron-induced fission of 235 U and 239 Pu for incident neutrons with energies from 1 to 20 MeV. The Chi-Nu experiment at …
View article: Nuclear shape coexistence in 194Hg
Nuclear shape coexistence in 194Hg Open
High spin states in the isotope 194Hg were populated using the 150Nd (48Ca,4n) reaction at a beam energy of 213 MeV. A sequence of dip ole transitions has been observed above 8 MeV excitation energy. Cross-over transitions have also been i…
View article: High spin structure of 155Dy
High spin structure of 155Dy Open
High spin states in 155Dy have been studied by γ-γ coincidence measurements via the 124Sn(36S, 5n)155Dy reaction at a beam energy of 155 MeV. Eight rotational bands have been populated and observed up to high spin (I<91/2).The band feature…
View article: High spin states of 195Hg
High spin states of 195Hg Open
High spin states in 195Hg, populated using the 150Nd(48 Ca,3n) reaction, were investigated by γ-ray spectroscopic techniques. Two backbendings are observed in the yrast band considered to be caused by the alignment of a pair of i13/2 and p…
View article: Prompt neutron emission in the neutron-induced fission of <sup>239</sup>Pu and the spontaneous fission of <sup>252</sup>Cf: an unfolding story
Prompt neutron emission in the neutron-induced fission of <sup>239</sup>Pu and the spontaneous fission of <sup>252</sup>Cf: an unfolding story Open
Prompt neutron emission is one of the major observables in fission and critical to a sustained chain reaction. The prompt neutron emission spectrum and its precision are essential for adequately modeling the chain reaction for any given ap…
View article: Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment
Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment Open
The goal of the Chi-Nu experiment at the Los Alamos Neutron Science Center is to measure the prompt fission neutron spectra from major actinides using a double time-of-flight method with a pulsed, white incoming neutron source. Fission eve…
View article: Validating (d,p gamma) as a Surrogate for Neutron Capture
Validating (d,p gamma) as a Surrogate for Neutron Capture Open
The r-process is responsible for creating roughly half of the elements heavier than iron. It has recently become understood that the rates at which neutron capture reactions proceed at late times in the rprocess may dramatically affect the…
View article: The <sup>235</sup>U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE
The <sup>235</sup>U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE Open
The Chi-Nu experiment aims to accurately measure the prompt fission neutron spectrum for the major actinides. At the Los Alamos Neutron Science Center (LANSCE), fission can be induced with neutrons ranging from 0.7 MeV and above. Using a t…
View article: Feeding of Rh and Ag isomers in fast-neutron-induced reactions
Feeding of Rh and Ag isomers in fast-neutron-induced reactions Open
In (n,n') reactions on stable Ir and Au isotopes in the mass A=190 region, the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy, up to the…
View article: Total kinetic energy release in the fast neutron-induced fission of $^{235}$U
Total kinetic energy release in the fast neutron-induced fission of $^{235}$U Open
We have measured the total kinetic energy (TKE) release for the $^{235}$U(n,f) reaction for $E_{n}$=2-100 MeV using the 2E method with an array of Si PIN diode detectors. The neutron energies were determined by time of flight measurements …
View article: Validating (d,p<i>γ</i>) as a Surrogate for Neutron Capture
Validating (d,p<i>γ</i>) as a Surrogate for Neutron Capture Open
The r-process is responsible for creating roughly half of the elements heavier than iron. It has recently become understood that the rates at which neutron capture reactions proceed at late times in the r-process may dramatically affect th…