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

doi:10.1088/1742-6596/665/1/012045

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

C Domingo-Pardo¹, R Caballero-Folch², J Agramunt¹, A Algora^1,3, A Arcones⁴, F Ameil⁴, Y Ayyad⁵, J Benlliure⁵, M Bowry⁶, F Calviño³, D Cano-Ott⁷, G Cortés², T Davinson⁸, I Dillmann^4,9, A Estrade^4,10, A Evdokimov^4,9, T Faestermann¹¹, F Farinon⁴, D Galaviz¹², A García-Rios⁷, H Geissel^4,9, W Gelletly⁶, R Gernhäuser¹¹, M B Gómez-Hornillos³, C Guerrero¹³, M Heil⁴, C Hinke¹¹, R Knöbel⁴, I Kojouharov⁴, J Kurcewicz⁴, N Kurz⁴, Y Litvinov⁴, L Maier¹¹, J Marganiec¹⁴, M Marta^4,9, T Martínez⁷, G Martínez-Pinedo⁴, B S Meyer²¹, F Montes^15,16, I Mukha⁴, D R Napoli¹⁷, Ch Nociforo⁴, C Paradela⁵, S Pietri⁴, Z Podolyák⁶, A Prochazka⁴, S Rice⁶, A Riego², B Rubio¹, H Schaffner⁴, Ch Scheidenberger^4,9, K Smith^18,19, E Sokol²⁰, K Steiger¹¹, B Sun⁴, J L Taín¹, M Takechi⁴, D Testov^20,22, H Weick⁴, E Wilson⁶, J S Winfield⁴, R Wood⁶, P Woods⁸ and A Yeremin²⁰

Published 1 January 2016 • Published under licence by IOP Publishing Ltd
Journal of Physics: Conference Series, Volume 665, Nuclear Physics in Astrophysics VI (NPA6) 19–24 May 2013, Lisbon, Portugal

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Author e-mails

domingo@ific.uv.es

Author affiliations

¹ IFIC, CSIC-University of Valencia, Valencia, Spain

² INTE-DFEN, UPC, Barcelona, Spain

³ Institute of Nuclear Research of Hungarian Academy of Sciences, Debrecen, Hungary

⁴ GSI Helmholtzzentrum für Schweionenforschung GmbH, Darmstadt, Germany

⁵ Universidade de Santiago de Compostela, Santiago de Compostela, Spain

⁶ Deptartment of Physics, University of Surrey, Guildford, United Kingdom

⁷ Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain

⁸ School of Physics and Astronomy, University of Edinburgh, United Kingdom

⁹ Physikalisches Institut, Justus-Liebig Universität Giessen, Germany

¹⁰ St. Mary's University, Halifax, Nova Scotia, Canada

¹¹ Physics Department E12, Technische Universität Munchen, Garching, Germany

¹² Centro de Fisica Nuclear da Universidade de Lisboa, Lisboa, Portugal

¹³ CERN, Geneva, Switzerland

¹⁴ ExtreMe Mater Institute, Darmstadt, Germany

¹⁵ National Superconducting Cyclotron Laboratory, Michigan State University, EastLansing, USA

¹⁶ Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, USA

¹⁷ Instituto Nazionale di Fisica Nucleare, Laboratori Nazionale di Legnaro, Italy

¹⁸ Department of Physics, University of Notre Dame, South Bend, USA

¹⁹ Joint Institute for Nuclear Astrophysics, University of Notre Dame, South Bend, USA

²⁰ Flerov Laboratory, Joint Institute for Nuclear Research, Dubna, Russia

²¹ Clemson University, USA

²² Institut de Physique Nucleaire d'Orsay, France

Citation

C Domingo-Pardo et al 2016 J. Phys.: Conf. Ser. 665 012045

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https://doi.org/10.1088/1742-6596/665/1/012045

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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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