Published April 1, 2020
| Version v1
Publication
Measurement of the 70Ge(n,γ) cross section up to 300 keV at the CERN n_TOF facility
Creators
- Gawlik, A.
- Lederer Woods, Claudia
- Andrzejewski, J.
- Battino, Umberto
- Ferreira, P.
- Gunsing, F.
- Heinitz, S.
- Krtiˇcka, M.
- Massimi, C.
- Mingrone, F.
- Perkowski, J.
- Reifarth, René
- Tattersall, A.
- Cortés Giraldo, Miguel Antonio
- Guerrero Sánchez, Carlos
- Lerendegui Marco, Jorge
- Praena Rodríguez, Javier
- Quesada Molina, José Manuel
- Sabaté Gilarte, Marta
Contributors
Description
Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The (n,γ) cross section on 70Ge, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n_TOF at CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections up to 300 keV. Stellar cross sections were calculated from kT =5 keV tokT =100 keV and are in very good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross sectionsareinagreementwithWalterandBeer(1985)overmostoftheneutronenergyrangecovered,whilethey aresystematicallysmallerforneutronenergiesabove150keV.Wehavecalculatedisotopicabundancesproduced in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar). While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to solar model shows a good global match to solar system abundances in the range of mass numbers A=60–80.
Abstract
Austrian Science Fund J3503Abstract
Adolf Messer Foundation ST/M006085/1Abstract
European Research Council ERC2015-StGAbstract
Croatian Science Foundation IP-2018-01-8570Additional details
Identifiers
- URL
- https://idus.us.es/handle//11441/94770
- URN
- urn:oai:idus.us.es:11441/94770
Origin repository
- Origin repository
- USE