Detailed studies of survival probabilities in hot fusion reactions

ORAL

Abstract

In the synthesis of new heavy nuclei by hot fusion reactions, the cross section for producing a new heavy nucleus, $\sigma_{EVR}$, can be represented as $\sigma_{EVR} (E_{C.M.})=\sum^{J_{max}}_{J=0}\sigma_{CN}(E_{c.m.},J) \cdot W_{sur}(E_{c.m.},J)$ where $\sigma_{CN}$ is the complete fusion cross section and W$_{sur}$ is the survival probability of the completely fused system. The survival probability is essentially the probability of de-exciting by neutron emission instead of fission. In this work, we are attempting to measure the survival probability, W$_{sur}$, for the first chance fission of excited Hs nuclei. We form the Hs nuclei using the $^{25,26}$Mg + $^{248}$Cm reaction. We measure the neutrons associated with pre-fission emission and those emitted by the fission fragments after fission using six BC501 neutron detectors and six silicon fission fragment detectors. We measure the angular distribution of the emitted neutrons and are able to separate the pre- and post-fission neutrons.

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Authors

  • A. Knecht

    Oregon State University, University of Idaho, Department of Chemistry, Oregon State University, Corvallis, OR, School of EECS, Oregon State University, Corvallis, OR, National Renewable Energy Laboratory, Golden, CO, Oregon Health and Science University, Linfield College, Purdue University, National Institute of Standards and Technology, Montana State University, University of British Columbia, University of Washington, Cornell University, Philipps-University, 35032 Marburg, Germany, University of Arizona, Tucson, Arizona 85721, Oregon State University, Corvallis, OR 97331, Physics Department, SUNY Binghamton, Physics Department, Oregon State University, Argonne National Laboratory

  • A. Knecht

    Oregon State University, University of Idaho, Department of Chemistry, Oregon State University, Corvallis, OR, School of EECS, Oregon State University, Corvallis, OR, National Renewable Energy Laboratory, Golden, CO, Oregon Health and Science University, Linfield College, Purdue University, National Institute of Standards and Technology, Montana State University, University of British Columbia, University of Washington, Cornell University, Philipps-University, 35032 Marburg, Germany, University of Arizona, Tucson, Arizona 85721, Oregon State University, Corvallis, OR 97331, Physics Department, SUNY Binghamton, Physics Department, Oregon State University, Argonne National Laboratory

  • A. Knecht

    Oregon State University, University of Idaho, Department of Chemistry, Oregon State University, Corvallis, OR, School of EECS, Oregon State University, Corvallis, OR, National Renewable Energy Laboratory, Golden, CO, Oregon Health and Science University, Linfield College, Purdue University, National Institute of Standards and Technology, Montana State University, University of British Columbia, University of Washington, Cornell University, Philipps-University, 35032 Marburg, Germany, University of Arizona, Tucson, Arizona 85721, Oregon State University, Corvallis, OR 97331, Physics Department, SUNY Binghamton, Physics Department, Oregon State University, Argonne National Laboratory