New measurement of β-decay properties of neutron-rich Se to Y isotopes relevant to r-process nucleosynthesis

ORAL

Abstract

We have measured the β-decay half-lives and β-delayed neutron emission probabilities of neutron-rich 92-96Se, 94-99Br, 97-102Kr, 99-104Rb, 101-106Sr, and 104-108Y isotopes with the BRIKEN detector setup at the Radioactive Isotope Beam Factory (RIBF). Our results include a first measurement of β-delayed one-neutron emission probabilities for 23 isotopes and two-neutron emission probabilities for 16 cases. The data is important to test theoretical models of mid-shell nuclei and astrophysics models of nucleosynthesis during the weak r-process. In particular, we will discuss the importance for the calculation of the decay properties measured in our experiment of including the neutron-γ competition during the de-excitation from intermediate states populated in the β-decay process. We also present the impact of the new data for models of the r-process in high-entropy winds of core-collapse supernovae.

*This research was supported in part by the U.S. DOE (DE-FG02-96ER40983 and DE-AC05-00OR22725), the NNSA (DE-NA0002132), and the NSF (PHY-1714153 and OISE-1927130), JSPS KAKENH (Japan), South Korea NRF (South Korea), NSERC (Canada), MEC, MCI and Generalitat Valenciana (Spain), STFC (UK), NKFIH (Hungary), NCN (Poland), European Commission FP7/EURATOM.

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Presenters

  • Alfredo Estrade

    • Central Michigan University

Authors

  • Alfredo Estrade

    • Central Michigan University

  • Neerajan Nepal

    • Central Michigan University

  • Alejandro Algora

    • IFIC, Universitat de Valencia

  • Shunji Nishimura

    • RIKEN Nishina Center

  • Vi H. Phong

    • RIKEN Nishina Center

  • Pedro Sarriguren

    • Instituto de Estructura de la Materia, CSIC

  • Jorge Agramunt

    • IFIC, Universitat de Valencia

  • Deuksoon Ahn

    • RIKEN Nishina Center

  • Thomas Berry

    • University of Surrey

  • Carlo Bruno

    • University of Edinburgh

  • Jeremy J Bundgaard

    • University of Tennessee

  • Roger Caballero-Folch

    • TRIUMF

  • Tom Davinson

    • University of Edinburgh

  • Iris Dillmann

    • TRIUMF

  • Aleksandra Fijalkowska

    • Rutgers University

  • Naoki Fukuda

    • RIKEN
    • Riken
    • RIKEN Nishina Center

  • Shintaro Go

    • RIKEN Nishina Center

  • Robert Grzywacz

    • University of Tennessee
    • University of Tennessee and Oak Ridge National Laboratory

  • Tadaaki Isobe

    • RIKEN Nishina Center

  • Shigeru Kubono

    • University of Tokyo

  • Jiajian Liu

    • University of Hong Kong

  • Giuseppe Lorusso

    • National Physical Laboratory

  • Keishi Matsui

    • University of Tokyo

  • Anabel Morales

    • IFIC, Universitat de Valencia

  • S.E.A. Orrigo

    • IFIC, Universitat de Valencia

  • Bertis C Rasco

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • ORNL

  • Krzysztof P Rykaczewski

    • Oak Ridge National Laboratory

  • Hiroyoshi Sakurai

    • RIKEN Nishina Center

  • Yohei Shimizu

    • RIKEN Nishina Center

  • Daniel W Stracener

    • Oak Ridge National Laboratory

  • Toshiyuki Sumikama

    • RIKEN Nishina Center

  • Hiroshi Suzuki

    • RIKEN
    • Riken
    • RIKEN Nishina Center

  • Jose L Tain

    • IFIC, Universitat de Valencia

  • Hiroyuki Takeda

    • RIKEN Nishina Center

  • Ariel Tarifeno-Saldivia

    • Universitat Politecnica de Catalunya

  • Alvaro Tolosa-Delgado

    • IFIC, Universitat de Valencia

  • Marzena Wolinska-Cinhocka

    • University of Warsaw

  • Jin Wu

    • Argonne National Laboratory
    • Michigan State University

  • Rin Yokoyama

    • University of Tennessee