169Tm(n, γ) cross section and statistical decay properties from measurements at the DANCE facility

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10509733" target="_blank" >RIV/00216208:11320/25:10509733 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0oJgRzE1Hy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0oJgRzE1Hy</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/5sjr-vyjv" target="_blank" >10.1103/5sjr-vyjv</a>

Jazyk výsledku

angličtina

Název v původním jazyce

169Tm(n, γ) cross section and statistical decay properties from measurements at the DANCE facility

Popis výsledku v původním jazyce

Background: Radiative neutron capture on thulium, which is a monoisotopic element, plays a role in different applications such as nuclear astrophysics or nuclear burning environments. Considerable discrepancies- reaching 20%-exist between evaluations in the unresolved-resonance region. Furthermore, experimental data on statistical gamma decay in odd-odd rare-earth nuclei is scarce. There are still open questions about the systematics of the so-called scissors mode in the M1 photon strength function, especially in odd-odd nuclei. Purpose: This work is focused on two main topics-deriving experimental 169Tm(n, gamma ) cross section and studying statistical gamma decay of 170Tm, in particular properties of the scissors mode. Methods: The capture experiments to obtain experimental cross section were performed at the Los Alamos Neutron Science Center using the time-of-flight technique and employing the Detector for Advanced Neutron Capture Experiments. Measured coincident gamma -ray spectra were also compared with statistical simulations using the DICEBOX code to test different models of level density and photon strength functions. Results: The capture cross section was determined from 1.8 eV to 0.97 MeV, the broadest neutron-energy range ever measured for this isotope. Several new resonances have been observed. The statistical gamma decay of 170Tm cannot be reproduced without a scissors mode resonance centered at approximate to 3.3 MeV. Conclusions: The measured cross section in the unresolved-resonance region is generally lower than the latest evaluations. The derived 169Tm s-process abundance is expected to increase by a factor of 1.26, while the changes of the abundances of elements heavier than 169Tm are in the order of 0.2%. The scissors mode properties in 170Tm are similar to those deduced in previous analyses of neighboring nuclei 168Er and 166Ho.

Název v anglickém jazyce

169Tm(n, γ) cross section and statistical decay properties from measurements at the DANCE facility

Popis výsledku anglicky

Background: Radiative neutron capture on thulium, which is a monoisotopic element, plays a role in different applications such as nuclear astrophysics or nuclear burning environments. Considerable discrepancies- reaching 20%-exist between evaluations in the unresolved-resonance region. Furthermore, experimental data on statistical gamma decay in odd-odd rare-earth nuclei is scarce. There are still open questions about the systematics of the so-called scissors mode in the M1 photon strength function, especially in odd-odd nuclei. Purpose: This work is focused on two main topics-deriving experimental 169Tm(n, gamma ) cross section and studying statistical gamma decay of 170Tm, in particular properties of the scissors mode. Methods: The capture experiments to obtain experimental cross section were performed at the Los Alamos Neutron Science Center using the time-of-flight technique and employing the Detector for Advanced Neutron Capture Experiments. Measured coincident gamma -ray spectra were also compared with statistical simulations using the DICEBOX code to test different models of level density and photon strength functions. Results: The capture cross section was determined from 1.8 eV to 0.97 MeV, the broadest neutron-energy range ever measured for this isotope. Several new resonances have been observed. The statistical gamma decay of 170Tm cannot be reproduced without a scissors mode resonance centered at approximate to 3.3 MeV. Conclusions: The measured cross section in the unresolved-resonance region is generally lower than the latest evaluations. The derived 169Tm s-process abundance is expected to increase by a factor of 1.26, while the changes of the abundances of elements heavier than 169Tm are in the order of 0.2%. The scissors mode properties in 170Tm are similar to those deduced in previous analyses of neighboring nuclei 168Er and 166Ho.

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

112

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

014612

Kód UT WoS článku

001530290200006

EID výsledku v databázi Scopus

2-s2.0-105021373981