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24 April 2024

» arxiv » 1309.3047

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Approaching the precursor nuclei of the third r-process peak with RIBs
C. Domingo-Pardo ; R. Caballero-Folch ; J. Agramunt ; A. Algora ; A. Arcones ; F. Ameil ; Y. Ayyad ; J. Benlliure ; M. Bowry ; F. Calviño ; D. Cano-Ott ; G. Cortés ; T. Davinson ; I. Dillmann ; A. Estrade ; A. Evdokimov ; T. Faestermann ; F. Farinon ; D. Galaviz ; A. García-Rios ; H. Geissel ; W. Gelletly ; R. Gernhäuser ; M.B. Gómez-Hornillos ; C. Guerrero ; M. Heil ; C. Hinke ; R. Knöbel ; I. Kojouharov ; J. Kurcewicz ; N. Kurz ; Y. Litvinov ; L. Maier ; J. Marganiec ; M. Marta ; T. Martínez ; G. Martínez-Pinedo ; B.S. Meyer ; F. Montes ; I. Mukha ; D.R. Napoli ; Ch. Nociforo ; C. Paradela ; S. Pietri ; Z. Podolyák ; A. Prochazka ; S. Rice ; A. Riego ; B. Rubio ; H. Schaffner ; Ch. Scheidenberger ; K. Smith ; E. Sokol ; K. Steiger ; B. Sun ; J.L. Taín ; M. Takechi ; D. Testov ; H. Weick ; E. Wilson ; J.S. Winfield ; R. Wood ; P. Woods ; A. Yeremin ;
Date:	12 Sep 2013
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 $^{238}$U beam at GSI we were able to measure such properties for several neutron-rich nuclei from $^{208}$Hg to $^{218}$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 $r$-process network calculations. In order to obtain a reasonable reproduction of the third $r$-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 $r$-process model calculations. Further measurements around $Nsim126$ are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic $r$-process abundance calculations.
Source:	arXiv, 1309.3047
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