Measurement of the 72Ge(n,γ) cross section over a wide neutron energy range at the CERN n_TOF facility
View/ Open
Author
nTOF Collaboration
Dietz, M.
Lederer-Woods, C.
Tattersall, A.
Battino, U.
Gunsing, F.
Heinitz, S.
Krtička, M.
Lerendegui-Marco, J.
Reifarth, R.
Valenta, S.
Aberle, O.
Amaducci, S.
Andrzejewski, J.
Audouin, L.
Bacak, M.
Balibrea, J.
Barbagallo, M.
Bečvář, F.
Berthoumieux, E.
Billowes, J.
Bosnar, D.
Brown, A.
Caamaño, M.
Calviño, F.
Calviani, M.
Cano-Ott, D.
Cardella, R.
Casanovas, A.
Cerutti, F.
Chen, Y. H.
Chiaveri, E.
Colonna, N.
Cortés, G.
Cortés-Giraldo, M. A.
Cosentino, L.
Damone, L. A.
Diakaki, M.
Domingo-Pardo, C.
Dressler, R.
Dupont, E.
Durán, I.
Fernández-Domínguez, B.
Ferrari, A.
Ferreira, P.
Finocchiaro, P.
Furman, V.
Göbel, K.
García, A. R.
Gawlik, A.
Rauscher, T.
Attention
2299/24907
Abstract
The Ge72(n,γ) cross section was measured for neutron energies up to 300keV at the neutron time-of-flight facility n_TOF (CERN), Geneva, for the first time covering energies relevant to heavy-element synthesis in stars. The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched GeO272 sample. The prompt capture γ rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43keV, and averaged cross sections from 43 to 300keV. Maxwellian-averaged cross section values were calculated from kT=5 to 100keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars.