New neutron-rich microsecond isomers observed among fission products of U238 at 80 MeV/nucleon

C. M. Folden, III, A. S. Nettleton, A. M. Amthor, T. N. Ginter, M. Hausmann, T. Kubo, W. Loveland, S. L. Manikonda, D. J. Morrissey, T. Nakao, M. Portillo, B. M. Sherrill, G. A. Souliotis, B. F. Strong, H. Takeda, and O. B. Tarasov
Phys. Rev. C 79, 064318 – Published 22 June 2009
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  • INTRODUCTION
  • EXPERIMENT
  • RESULTS AND DISCUSSION
  • SUMMARY AND CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    Eight new isomeric states in neutron-rich nuclides have been discovered in fission fragments produced by the reaction of an 80 MeV/nucleon U238 beam with a Be9 target and separated in-flight using the A1900 fragment separator. The experiment was conducted at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. Gamma rays were detected in a high-purity germanium detector located at the focal plane within a time window of 20 μs following ion implantation. In some cases the isomers were observed to decay into previously reported states, allowing us to assign the initial decay from the isomeric state. Among the outcomes, the results suggest that many studies on the nuclear structure of medium-mass neutron-rich nuclei are feasible at projectile fragmentation facilities using induced fission.

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    • Received 29 July 2008

    DOI:https://doi.org/10.1103/PhysRevC.79.064318

    ©2009 American Physical Society

    Authors & Affiliations

    C. M. Folden, III1,*, A. S. Nettleton1,2, A. M. Amthor1,2, T. N. Ginter1, M. Hausmann1, T. Kubo3, W. Loveland4, S. L. Manikonda5, D. J. Morrissey1,6, T. Nakao3,7, M. Portillo1, B. M. Sherrill1,2, G. A. Souliotis8, B. F. Strong6, H. Takeda3, and O. B. Tarasov1,9

    • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
    • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
    • 3RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan
    • 4Department of Chemistry, Oregon State University, Corvallis, Oregon 97330, USA
    • 5Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
    • 6Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
    • 7Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
    • 8Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
    • 9Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region, Russian Federation

    • *Present address: Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA.

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    Issue

    Vol. 79, Iss. 6 — June 2009

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