Title: Measurement of the Radiative Neutron Capture Cross Section of 206Pb and its Astrophysical Implications
Authors: DOMINGO PARDO C.ABBONDANNO U.AERTS G.Alvarez HALVAREZ VELARDE F.ANDRIAMONJE S.ANDRZEJEWSKI J.ASSIMAKOPOULOS P.AUDOUIN L.BADUREK G.BAUMANN PBECVAR F.BERTHOUMIEUX E.BISTERZO S.CALVINO F.CALVIANI M.CANO OTT D.CAPOTE NOY RobertoCARRAPICO C.CENNINI P.CHEPEL V.CHIAVERI E.COLONNA N.CORTES G.COUTURE A.COX J.DAHLFORS M.DAVID S.DILLMAN I.DOLFINI R.DRIDI W.DURAN I.ELEFTHERIADIS KostasEMBID SEGURA M.FERRANT L.FERRARI A.FERREIRA MARQUES R.FITZPATRICK L.FRAIS KOELBL H.FUJII K.FURMAN W.GALLINO R.GONCALVES I.GONZALEZ ROMERO E.GOVERDOVSKI A.GRAMEGNA F.GRIESMAYER E.GUERRERO CarlosGUNSING FrankHAAS B.HAIGHT R.HEIL M.HERRERA MARTINEZ A.IGASHIRA M.ISAEV M.JERICHA E.KAPPELER F.KADI Y.KARADIMOS D.KARAMANIS D.KERVENO M.KETLEROV V.KOEHLER P.KONOVALOV V.KOSSIONIDES E.KRTICKA M.LAMBOUDIS C.LEEB H.LINDOTE A.LOPES I.LOZANO MacarenaLUKIC S.MARGANIEC J.MARRONE S.MASSIMI C.MASTINU P.MENGONI A.MILAZZO P. M.MOREAU C.MOSCONI M.NEVES F.OBERHUMMER H.OSHIMA M.O¿BRIEN S.PANCIN J.PAPACHRISTODOULOU C.PAPADOPOULOS C.PARADELA C.PATRONIS N.PAVLIK A.PAVLOPOULOS P.PERROT L.PLAG R.PLOMPEN ARJANPLUKIS A.POCH A.PRETEL C.QUESADA J.RAUSCHER T.REIFARTH R.ROSETTI M.RUBBIA C.RUDOLF G.RULLHUSEN PETERSALGADO J.SARCHIAPONE L.SAVVIDIS I.STEPHAN C.TAGLIENTE G.TAIN J. L.TASSAN-GOT L.TAVORA L.TERLIZZI R.VANNINI G.VAZ P.VENTURA A.VILLAMARIN D.VINCENTE C.VLACHOUDIS V.VLASTOU R.VOSS F.WALTER S.WENDLER H.WIESCHER M.WISSHAK K.
Citation: PHYSICAL REVIEW C vol. 76 p. 045805-1 045805-10
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2007
JRC Publication N°: JRC41844
ISSN: 0556-2813
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC41844
DOI: 10.1103/PhysRevC.76.045805
Type: Articles in Journals
Abstract: The (n, ¿ ) cross section of 206Pb has been measured at the CERN n TOF facility with high resolution in the energy range from 1 eV to 620 keV by using two optimized C6D6 detectors. In the investigated energy interval about 130 resonances could be observed, from which 61 had enough statistics to be reliably analyzed via the R-matrix analysis code SAMMY. Experimental uncertainties were minimized, in particular with respect to (i) angular distribution effects of the prompt capture ¿ -rays, and to (ii) the TOF-dependent background due to sample-scattered neutrons. Other background components were addressed by background measurements with an enriched 208Pb sample. The effect of the lower energy cutoff in the pulse height spectra of the C6D6 detectors was carefully corrected via Monte Carlo simulations. Compared to previous 206Pb values, the Maxwellian averaged capture cross sections derived from these data are about 20% and 9% lower at thermal energies of 5 keV and 30 keV, respectively. These new results have a direct impact on the s-process abundance of 206Pb,which represents an important test for the interpretation of the cosmic clock based on the decay of 238U.
JRC Institute:Institute for Reference Materials and Measurements

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