Neutron capture of the Bottle-neck Isotopes (138)Ba and (208)Pb, s-process studies and the r-process abundance distribution
The capture cross sections of (138)Ba and (208)Pb have been measured by time-of-flight (TOF) at the electron linear accelerator GELINA in the energy range 200 eV to 200 keV. The Maxwellian averaged capture (MAC) cross section were determined against temperature kT between 5 and 100 keV. The data were applied to carry out new parametric studies of the s-process. Two parametrized models were considered, pulsed s-process with one neutron source and double pulsed s-process, with combined burning of 2 neutron sources. Through the s-process abundance distributions the complementary semi-empirical p-process and r-process abundance distributions were determined. The termination of the s-process was investigated. It was found that in the frame of the double pulse s-process model only negligible amounts of 209Bi are synthesized. This would mean that bismuth is mainly an r-process element.
Bibliographic Reference: Article: The Astrophysical Journal (1996)
Record Number: 199610484 / Last updated on: 1996-05-20
Original language: en
Available languages: en