Spectroscopy Of Reflection A Y s y & net ric Nuclei Using Multinucleon Transfe React ions fsJW 1 2 1996 O S T I
semanticscholar(2008)
Abstract
The heavy-ion collisions of 56Fe + 232Th, 86Kr + 232Th and 136Xe + 232Th with beam energies 15-20% above the Coulomb barrier were used to populate nuclei in the light-actinide region. Yield distributions of the binary reaction products stopped in thick targets were obtained by measuring y-y coincidence intensities. The 136Xe + 232Th reaction was repeated at Lawrence Berkeley National Laboratory using a recent implementation of the GAMMASPHERE array. Many interesting discoveries concerning the high-spin structure of octupole-deformed light-actinide nuclei have been made. Nuclei with 2-88 and Nz134 have their neutron and proton Fermi levels in close proximity to the octupole-driving ~ ( j 1 5 / 2 and gs/2) and ~(i13/2 and f7/2) orbitals. Thus these lightactinide nuclei are susceptible to octupole deformation [l], [2]. Nuclei in this region can be studied using fusion-evaporation reactions but low production cross-sections (Smillibarns) and large fission cross-sections [3] make these nuclei difficult to study by these means. This by a contractor of the U. S. Government under contract No. W-31-104ENG-38. Accordingly, the U. S Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, tor U. S. Government purposes. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency tbereof. nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process. or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recornmendktion, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect thosc of the United States Government or any agency thereof. DECLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best avaiiable original document.
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