Abstract
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
Original language | English |
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Article number | 014020 |
Number of pages | 6 |
Journal | Journal of Physics G: Nuclear and Particle Physics |
Volume | 35 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2008 |
Event | 3rd Europhysics Conference on Nuclear Physics in Astrophysics (NPA3) - Dresden, Germany Duration: 26 Mar 2007 → 31 Mar 2007 |
Keywords
- CHRONOMETERS
- STARS
- ELEMENTS
- LEAD
- NEUTRON-CAPTURE
- GALACTIC CHEMICAL EVOLUTION