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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10300 - Physical sciences

Project

<a href="/en/project/GA23-06439S" target="_blank" >GA23-06439S: Collective dynamics of nuclear electromagnetic excitations</a><br>

Continuities

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

Publication year

2025

Confidentiality

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

Name of the periodical

Physical Review C

ISSN

2469-9985

e-ISSN

2469-9993

Volume of the periodical

112

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

15

Pages from-to

014612

UT code for WoS article

001530290200006

EID of the result in the Scopus database

2-s2.0-105021373981