Approaching the precursor nuclei of the third r-process peak with RIBs
Abstract
The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich nuclei, which represent a theoretical and experimental challenge. Two of the main decay properties that affect the final abundance distribution the most are half-lives and neutron branching ratios. Using fragmentation of a primary U beam at GSI we were able to measure such properties for several neutron-rich nuclei from Hg to Pb. This contribution provides a short update on the status of the data analysis of this experiment, together with a compilation of the latest results published in this mass region, both experimental and theoretical. The impact of the uncertainties connected with the beta-decay rates and with beta-delayed neutron emission is illustrated on the basis of -process network calculations. In order to obtain a reasonable reproduction of the third -process peak, it is expected that both half-lives and neutron branching ratios are substantially smaller, than those based on FRDM+QRPA, commonly used in -process model calculations. Further measurements around are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic -process abundance calculations.
Keywords
Cite
@article{arxiv.1309.3047,
title = {Approaching the precursor nuclei of the third r-process peak with RIBs},
author = {C. Domingo-Pardo and R. Caballero-Folch and J. Agramunt and A. Algora and A. Arcones and F. Ameil and Y. Ayyad and J. Benlliure and M. Bowry and F. Calviño and D. Cano-Ott and G. Cortés and T. Davinson and I. Dillmann and A. Estrade and A. Evdokimov and T. Faestermann and F. Farinon and D. Galaviz and A. García-Rios and H. Geissel and W. Gelletly and R. Gernhäuser and M. B. Gómez-Hornillos and C. Guerrero and M. Heil and C. Hinke and R. Knöbel and I. Kojouharov and J. Kurcewicz and N. Kurz and Y. Litvinov and L. Maier and J. Marganiec and M. Marta and T. Martínez and G. Martínez-Pinedo and B. S. Meyer and F. Montes and I. Mukha and D. R. Napoli and Ch. Nociforo and C. Paradela and S. Pietri and Z. Podolyák and A. Prochazka and S. Rice and A. Riego and B. Rubio and H. Schaffner and Ch. Scheidenberger and K. Smith and E. Sokol and K. Steiger and B. Sun and J. L. Taín and M. Takechi and D. Testov and H. Weick and E. Wilson and J. S. Winfield and R. Wood and P. Woods and A. Yeremin},
journal= {arXiv preprint arXiv:1309.3047},
year = {2013}
}
Comments
Nuclear Physics in Astrophysics VI, Lisbon 2013, Conference Proceedings