학술논문
First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring
Document Type
Working Paper
Author
Sguazzin, M.; Jurado, B.; Pibernat, J.; Swartz, J. A.; Grieser, M.; Glorius, J.; Litvinov, Yu. A.; Adamczewski-Musch, J.; Alfaurt, P.; Ascher, P.; Audouin, L.; Berthelot, C.; Blank, B.; Blaum, K.; Brückner, B.; Dellmann, S.; Dillmann, I.; Domingo-Pardo, C.; Dupuis, M.; Erbacher, P.; Flayol, M.; Forstner, O.; Freire-Fernández, D.; Gerbaux, M.; Giovinazzo, J.; Grévy, S.; Griffin, C. J.; Gumberidze, A.; Heil, S.; Heinz, A.; Hess, R.; Kurtulgil, D.; Kurz, N.; Leckenby, G.; Litvinov, S.; Lorentz, B.; Méot, V.; Michaud, J.; Pérard, S.; Petridis, N.; Popp, U.; Ramos, D.; Reifarth, R.; Roche, M.; Sanjari, M. S.; Sidhu, R. S.; Spillmann, U.; Steck, M.; Stöhlker, Th.; Thomas, B.; Thulliez, L.; Versteegen, M.; Włoch, B.
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Abstract
Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the radioactivity of the targets involved. One way of overcoming this issue is to combine surrogate reactions with the unique possibilities offered by heavy-ion storage rings. In this work, we describe the first surrogate-reaction experiment in inverse kinematics, which we successfully conducted at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, using the 208Pb(p,p') reaction as a surrogate for neutron capture on 207Pb. Thanks to the outstanding detection efficiencies possible at the ESR, we were able to measure for the first time the neutron-emission probability as a function of the excitation energy of 208Pb. We have used this probability to select different descriptions of the gamma-ray strength function and nuclear level density, and provide reliable results for the neutron-induced radiative capture cross section of 207Pb at energies for which no experimental data exist.
Comment: 10 pages and 5 figures
Comment: 10 pages and 5 figures