Radiative-capture cross sections for the La-139(n, gamma) reaction using thermal neutrons and structural properties of La-140

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10404994" target="_blank" >RIV/00216208:11320/19:10404994 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=l8GjpQR5fm" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=l8GjpQR5fm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.99.024310" target="_blank" >10.1103/PhysRevC.99.024310</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Radiative-capture cross sections for the La-139(n, gamma) reaction using thermal neutrons and structural properties of La-140

Popis výsledku v původním jazyce

A set of prompt partial gamma -ray production cross sections from thermal neutron capture were measured for the La-139(n, gamma) reaction using a guided beam of subthermal (thermal and cold) neutrons incident on a (La2O3)-La-nat target at the Prompt Gamma Activation Analysis facility of the Budapest Research Reactor. Absolute La-140 cross sections were determined relative to the well-known comparator Cl-35(n, gamma) cross sections from the irradiation of a stoichiometric (LaCl3)-La-nat sample. The total cross section for radiative thermal neutron capture on La-139 from the sum of experimentally measured cross sections observed to directly feed the La-140 ground state was determined to be sigma(expt)(0) = 8.58(50) b. To assess completeness of the decay scheme and as a consistency check, the measured cross sections for transitions feeding the ground state from levels below a critical energy of E-c = 285 keV were combined with a modeled contribution accounting for ground-state feeding from the quasicontinuum to arrive at a total cross section of sigma(0) = 9.36(74) b. In addition, a neutron-separation energy of S-n = 5161.001(21) keV was determined from a least-squares fit of the measured primary gamma-ray energies to the low-lying levels of the La-140 decay scheme. Furthermore, several nuclear structure improvements are proposed for the decay scheme. The measured cross-section and separation-energy results are comparable to earlier measurements of these quantities.

Název v anglickém jazyce

Radiative-capture cross sections for the La-139(n, gamma) reaction using thermal neutrons and structural properties of La-140

Popis výsledku anglicky

A set of prompt partial gamma -ray production cross sections from thermal neutron capture were measured for the La-139(n, gamma) reaction using a guided beam of subthermal (thermal and cold) neutrons incident on a (La2O3)-La-nat target at the Prompt Gamma Activation Analysis facility of the Budapest Research Reactor. Absolute La-140 cross sections were determined relative to the well-known comparator Cl-35(n, gamma) cross sections from the irradiation of a stoichiometric (LaCl3)-La-nat sample. The total cross section for radiative thermal neutron capture on La-139 from the sum of experimentally measured cross sections observed to directly feed the La-140 ground state was determined to be sigma(expt)(0) = 8.58(50) b. To assess completeness of the decay scheme and as a consistency check, the measured cross sections for transitions feeding the ground state from levels below a critical energy of E-c = 285 keV were combined with a modeled contribution accounting for ground-state feeding from the quasicontinuum to arrive at a total cross section of sigma(0) = 9.36(74) b. In addition, a neutron-separation energy of S-n = 5161.001(21) keV was determined from a least-squares fit of the measured primary gamma-ray energies to the low-lying levels of the La-140 decay scheme. Furthermore, several nuclear structure improvements are proposed for the decay scheme. The measured cross-section and separation-energy results are comparable to earlier measurements of these quantities.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

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

—

Svazek periodika

99

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

33

Strana od-do

024310

Kód UT WoS článku

000458815800004

EID výsledku v databázi Scopus

2-s2.0-85061772446