Constraining calculations of 239Pu(n, γ) cross sections with multistep cascade γ-ray spectra measured at the DANCE facility

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10509727" target="_blank" >RIV/00216208:11320/25:10509727 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K.-4YhkwWm" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K.-4YhkwWm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.111.024610" target="_blank" >10.1103/PhysRevC.111.024610</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Constraining calculations of 239Pu(n, γ) cross sections with multistep cascade γ-ray spectra measured at the DANCE facility

Popis výsledku v původním jazyce

Measurements of multistep cascade gamma-ray spectra from several low-lying 1+ resonances in the 239Pu(n, gamma ) reaction were made using the DANCE detector. The measured spectra are compared to spectra simulated using several models for the photon strength function and the nuclear level density, representing the first analysis of this nature on a fissile nucleus. In general, models of the photon strength function that included a strong M1 &quot;scissors mode&quot; contribution coupled with a Gilbert-Cameron nuclear level density provided a reasonable description of the spectra. Simulations using photon strength functions and nuclear level densities specifically for 240Pu, extracted by the Oslo method, resulted in a very good representation of the measured spectra. Neutron-capture cross section calculations that included the scissors mode provided a good estimate of the previously measured values, without additional normalization. However, the scissors-mode energy that produced the best description of the multistep cascade spectra was different from the value that best reproduced the capture cross section. In addition, the (Gamma gamma ) inferred from the multistep cascade calculations was somewhat less than the tabulated value, which was determined from resonance analysis.

Název v anglickém jazyce

Constraining calculations of 239Pu(n, γ) cross sections with multistep cascade γ-ray spectra measured at the DANCE facility

Popis výsledku anglicky

Measurements of multistep cascade gamma-ray spectra from several low-lying 1+ resonances in the 239Pu(n, gamma ) reaction were made using the DANCE detector. The measured spectra are compared to spectra simulated using several models for the photon strength function and the nuclear level density, representing the first analysis of this nature on a fissile nucleus. In general, models of the photon strength function that included a strong M1 &quot;scissors mode&quot; contribution coupled with a Gilbert-Cameron nuclear level density provided a reasonable description of the spectra. Simulations using photon strength functions and nuclear level densities specifically for 240Pu, extracted by the Oslo method, resulted in a very good representation of the measured spectra. Neutron-capture cross section calculations that included the scissors mode provided a good estimate of the previously measured values, without additional normalization. However, the scissors-mode energy that produced the best description of the multistep cascade spectra was different from the value that best reproduced the capture cross section. In addition, the (Gamma gamma ) inferred from the multistep cascade calculations was somewhat less than the tabulated value, which was determined from resonance analysis.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/GA23-06439S" target="_blank" >GA23-06439S: Kolektivní dynamika jaderných elektromagnetických excitací</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

111

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

024610

Kód UT WoS článku

001452574300002

EID výsledku v databázi Scopus

2-s2.0-85217747888