Isomeric States in Neutron-rich Isotopes near A~100

POSTER

Abstract

The search for previously unknown nuclear isomers, or excited energy states within nuclei, continues to be an exciting frontier of nuclear physics as particle acceleration capabilities improve and unstable isotopes become more accessible. Nuclear isomers are typically formed as a result of in-flight fission and fragmentation reactions, and can exhibit metastable half-lives of the order of microseconds or longer. In order to discover potential new isomeric states within neutron-rich nuclei, a Be target was bombarded with a 345 MeV/nucleon 238U beam at the RIBF facility at RIKEN in Japan. The resulting fission produced a collection of isotopes in the A~100 range, which were separated out and implanted in the silicon detectors within the BRIKEN setup. Finally, 2 germanium clover detectors measured γ counts to identify energy levels from the produced isotopes. Here, we report on the observation of previously known gamma-decaying isomers, and search for new isomeric states for isotopes in the region from 92Se to 108Y.

*This research was sponsored in part by the National Science Foundation Grant PHY 1714153 and by the Office of Nuclear Physics, U.S. Department of Energy under contracts DE-AC05-00OR22725

Presenters

  • Jack R Newcomb

    • Central Michigan University

Authors

  • Jack R Newcomb

    • Central Michigan University

  • Neerajan Nepal

    • Central Michigan Univ
    • Central Michigan University

  • Alejandro Algora

    • Instituto de Fisica Corpuscular, Valencia, Spain

  • Alfredo Estrade

    • Central Michigan University
    • Central Michigan Univ

  • Shunji Nishimura

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Jorge Agramunt

    • Instituto de Fisica Corpuscular, Valencia, Spain

  • Deuksoon Ahn

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Carlo Bruno

    • University of Edinburgh, UK
    • University of Edinburgh, United Kingdom

  • Roger Caballero-Folch

    • TRIUMF, Vancouver, Canada
    • TRIUMF, Canada
    • TRIUMF

  • Tom Davinson

    • University of Edinburgh, UK
    • University of Edinburgh, United Kingdom

  • Iris Dillmann

    • TRIUMF
    • TRIUMF, Canada

  • Alexandra Fijalkowska

    • Rutgers University, USA
    • Rutgers University, United States

  • Naoki Fukuda

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Shintaro Go

    • Kyushu University
    • RIKEN Nishina Center, Japan

  • Robert Grzywacz

    • University of Tennessee
    • University of Tennessee and Oak Ridge National Lab
    • University of Tennessee, Knoxville

  • Tadaaki Isobe

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Shigeru Kubono

    • Univ of Tokyo
    • RIKEN Nishina Center, Japan

  • Jiajian Liu

    • University of Hong Kong

  • Giuseppe Lorusso

    • National Physical Laboratory Teddington, UK
    • National Physical Laboratory, Teddington, UK
    • National Physical Laboratory, Teddington, United Kingdom

  • Keishi Matsui

    • University of Tokyo, Japan

  • Anabel Morales

    • Instituto de Fisica Corpuscular, Valencia, Spain

  • S.E.A. Orrigo

    • Instituto de Fisica Corpuscular, Valencia, Spain

  • Vi H. Phong

    • VNU Hanoi University of Science, Viet Nam
    • RIKEN Nishina Center, Japan

  • Bertis C Rasco

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

  • Krzysztof Rykaczewski

    • Oak Ridge National Laboratory
    • ORNL

  • Hiroyoshi Sakurai

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Yohei Shimizu

    • RIKEN Nishina Center, Japan

  • Daniel W Stracener

    • Oak Ridge National Laboratory

  • Toshiyuki Sumikama

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Hiroshi Suzuki

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Jose L Tain

    • Instituto de Fisica Corpuscular, Valencia, Spain
    • Instituto de Física Corpuscular

  • Hiroyuki Takeda

    • RIKEN Nishina Center
    • RIKEN Nishina Center, Japan

  • Ariel Tarifeno-Saldivia

    • Universitat Polit\`{e}cnica de Catalunya, Spain
    • Universitat Politecnica de Catalunya (UPC), Spain

  • Alvaro Tolosa-Delgado

    • Instituto de Fisica Corpuscular, Valencia, Spain

  • Marzena Wolinska-Cinhocka

    • Heavy Ion Laboratory University of Warsaw, Poland
    • Heavy Ion Laboratory, University of Warsaw
    • Heavy Ion Laboratory, University of Warsaw, Poland

  • Jin Wu

    • Argonne National Laboratory

  • Rin Yokoyama

    • University of Tennessee