Super-asymmetric fission in the Cm-245(n(th), f) reaction at the Lohengrin fission-fragment mass separator

摘要

Mass, isotopic yields and single-fragment kinetic energy measurements for thermal-neutron induced fission of Cm-245 at the Lohengrin fission-product mass separator are described. Using an ionization chamber coupled to the mass separator, we have measured the mass and isotopic yields from fragment mass A = 67 up to A = 77 over three yield decades. This considerably extends the data set previously known for the light peak. A full set of data is now available for this actinide in the super-asymmetric mass region. The results of mass and isotopic yields are compared with those of other compound nuclei to highlight the shell effect at mass 70 for the Cm-246* compound-nucleus system. Also, the present results are compared to the data from the European library JEF2 and the evaluation from Wahl's Z(p) model. (C) 2004 Elsevier B.V. All rights reserved.