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The measurement of the 206Pbn, gamma cross section and stellar implications

C. Domingo-Pardo U. Abbondanno G. Aerts 1 H. Álvarez F. Alvarez-Velarde S. Andriamonje 1 J. Andrzejewski P. Assimakopoulos L. Audouin G. Badurek P. Baumann 2 F. Becvar E. Berthoumieux 1 S. Bisterzo F. Calviño M. Calviani D. Cano-Ott R. Capote C. Carrapico P. Cennini V. Chepel N. Colonna G. Cortes A. Couture J. Cox M. Dahlfors S. David 3 I. Dillmann W. Dridi 1 I. Duran C. Eleftheriadis M. Embid-Segura L. Ferrant 3 Anthony Ferrari R. Ferreira-Marques K. Fujii W. Furman R. Gallino I. Goncalves E. Gonzalez-Romero F. Gramegna C. Guerrero F. Gunsing 1 B. Haas 4 R. Haight M. Heil A. Herrera-Martinez M. Igashira E. Jericha Y. Kadi F. Käppeler D. Karadimos D. Karamanis M. Kerveno 2 P. Koehler E. Kossionides M. Krticka C. Lamboudis H. Leeb A. Lindote I. Lopes M. Lozano S. Lukic 2 J. Marganiec S. Marrone C. Massimi P. Mastinu A. Mengoni P. M Milazzo M. Mosconi F. Neves H. Oberhummer S. O'Brien J. Pancin 1 C. Papachristodoulou C. Papadopoulos C. Paradela N. Patronis A. Pavlik P. Pavlopoulos L. Perrot 1 M. T Pigni R. Plag A. Plompen A. Plukis 1 A. Poch C. Pretel J. Quesada T. Rauscher R. Reifarth C. Rubbia G. Rudolf 2 P. Rullhusen J. Salgado C. Santos L. Sarchiapone I. Savvidis C. Stephan 3 G. Tagliente J. L Tain L. Tassan-Got 3 L. Tavora R. Terlizzi G. Vannini P. Vaz A. Ventura D. Villamarin M. C Vincente V. Vlachoudis R. Vlastou F. Voss S. Walter M. Wiescher K. Wisshak
Abstract : The neutron capture cross section of 206Pb has been measured at the CERN n\TOF spectrometer using a setup of two C6D6 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 206Pb 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 206Pb is dominated by α-back decays of short-lived transbismuth isotopes.
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Submitted on : Friday, December 14, 2007 - 11:59:11 AM
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C. Domingo-Pardo, U. Abbondanno, G. Aerts, H. Álvarez, F. Alvarez-Velarde, et al.. The measurement of the 206Pbn, gamma cross section and stellar implications. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2008, 35, pp.014020. ⟨10.1088/0954-3899/35/1/014020⟩. ⟨in2p3-00197132⟩

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