The measurement of the 206Pb(n, γ) cross section and stellar implications

Domingo Pardo, C.; Abbondanno, U.; Aerts, G.; Álvarez, H.; Alvarez Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Baumann, P.; Bečvář, F.; Berthoumieux, E.; Bisterzo, S.; Calviño, F.; Calviani, M.; Cano Ott, D.; Capote, R.; Carrapiço, C.; Cennini, P.; Chepel, V.; Colonna, N.; Cortes, G.; Couture, A.; Cox, J.; Dahlfors, M.; David, S.; Dillmann, I.; Dridi, W.; Duran, I.; Eleftheriadis, C.; Embid Segura, M.; Ferrant, L.; Ferrari, A.; Ferreira Marques, R.; Fujii, K.; Furman, W.; Gallino, R.; Goncalves, I.; Gonzalez Romero, E.; Gramegna, F.; Guerrero, C.; Gunsing, F.; Haas, B.; Haight, R.; Heil, M.; Herrera Martinez, A.; Igashira, M.; Jericha, E.; Kadi, Y.; Käppeler, F.; Karadimos, D.; Karamanis, D.; Kerveno, M.; Koehler, P.; Kossionides, E.; Krtička, M.; Lamboudis, C.; Leeb, H.; Lindote, A.; Lopes, I.; Lozano, M.; Lukic, S.; Marganiec, J.; Marrone, S.; Massimi, Cristian; Mastinu, P.; Mengoni, A.; Milazzo, P. M.; Mosconi, M.; Neves, F.; Oberhummer, H.; O'Brien, S.; Pancin, J.; Papachristodoulou, C.; Papadopoulos, C.; Paradela, C.; Patronis, N.; Pavlik, A.; Pavlopoulos, P.; Perrot, L.; Pigni, M. T.; Plag, R.; Plompen, A.; Plukis, A.; Poch, A.; Pretel, C.; Quesada, J.; Rauscher, T.; Reifarth, R.; Rubbia, C.; Rudolf, G.; Rullhusen, P.; Salgado, J.; Santos, C.; Sarchiapone, L.; Savvidis, I.; Stephan, C.; Tagliente, G.; Tain, J. L.; Tassan Got, L.; Tavora, L.; Terlizzi, R.; Vannini, Gianni; Vaz, P.; Ventura, A.; Villamarin, D.; Vincente, M. C.; Vlachoudis, V.; Vlastou, R.; Voss, F.; Walter, S.; Wiescher, M.; Wisshak, K.

doi:10.1088/0954-3899/35/1/014020

The neutron capture cross section of (206)Pb has been measured at the CERN n_TOF spectrometer using a setup of two C(6)D(6) detectors. In the energy interval from 1 eV to 600 keV the cross section is dominated by resonances, which were analyzed via the R-matrix analysis code SAMMY. In the relevant energy ranges for stellar nucleosynthesis, i. e., at thermal energies of kT = 8 keV and kT = 23 keV, the present Maxwellian average cross section differs by 20% and 9% from the recommended values of Bao et al respectively. From the new cross section the s-abundance of (206)Pb could be reliably determined as 70( 4)%. This result is of importance in order to test and constrain r-process abundance calculations in the actinide region, because the r-process portion of (206)Pb is dominated by alpha-back decays of short-lived transbismuth isotopes.

C Domingo-Pardo, U Abbondanno, G Aerts, H Álvarez, F Alvarez-Velarde, S Andriamonje, et al. (2008). The measurement of the 206Pb(n, γ) cross section and stellar implications. JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS, 35, 014020-1-014020-6 [10.1088/0954-3899/35/1/014020].