Measurement of neutron-capture cross sections of 70,72Ge using the DANCE facility
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10455209" target="_blank" >RIV/00216208:11320/22:10455209 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bKWuLKmBVN" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bKWuLKmBVN</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevC.106.025802" target="_blank" >10.1103/PhysRevC.106.025802</a>
Alternative languages
Result language
angličtina
Original language name
Measurement of neutron-capture cross sections of 70,72Ge using the DANCE facility
Original language description
Background: Approximately half of all atomic nuclei heavier than iron are synthesized by the slow neutroncapture process. The weak component of this process is not well understood and the reaction rates of each isotope in the s-process path affect nucleosynthesis abundances downstream. Purpose: To measure the neutron-capture cross sections of two weak s-process nuclei, 70,72Ge, using the neutron time-of-flight technique. Measuring the capture cross sections for isotopes in this region of the chart of nuclides has proven challenging due to dominant scattering cross sections. Method: Samples consisted of pellets made of pressed enriched metallic powders. The 70,72Ge neutron-capture cross sections were measured as a function of neutron energy using the Detector for Advanced Neutron Capture Results: Neutron-capture cross sections were measured from 10 eV to 1 MeV. These are the first measurements for 70,72Ge between 300 keV and 1 MeV neutron energy. Maxwellian-averaged cross sections were calculated in the astrophysically relevant neutron energy range (5 keV kT 100 keV). Their value at kT = 30 keV was found to be 89 +/- 11 mb for 70Ge and 58 +/- 5 mb for 72Ge. Both values are in agreement with recent time-of-flight measurements at n_TOF (neutron Time-Of-Flight facility at the European Organization for Nuclear Research). Conclusions: The average cross section results from this work for 70Ge show minor (<1 Sigma) disagreement with a recent measurement by the n_TOF collaboration at higher neutron energies. This corresponds to the neutron energy region that had previously never been measured (>300 keV). Two reaction library databases underestimate the 72Ge average cross section below 30 keV according to n_TOF and DANCE. This is likely due to capture resonances that are missing from the theoretical cross sections in the databases that were identified in both time-of-flight measurements. Additionally, a rudimentary analysis of the impact of both cross section measurements on stellar nucleosynthesis abundances using the NETZ nucleosynthesis tool is presented.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/GA19-14048S" target="_blank" >GA19-14048S: Theoretical and experimental search for new features of electromagnetic nuclear excitations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review C
ISSN
2469-9985
e-ISSN
2469-9993
Volume of the periodical
106
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
025802
UT code for WoS article
000838231200002
EID of the result in the Scopus database
2-s2.0-85137289003