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Approaching the precursor nuclei of the third r-process peak with RIBs

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  • 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
  • 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
  • A. Yeremin

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Original languageEnglish
Article number012045
JournalJournal of Physics: Conference Series
Volume665
Issue number1
DOIs
Publication statusPublished - 5 Jan 2016

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 238U beam at GSI we were able to measure such properties for several neutron-rich nuclei from 208Hg to 218Pb. 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 N ∼ 126 are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic r-process abundance calculations.

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