Abstract
Studies of superheavy nuclei produced in the Bk + Ca reaction were performed using the Dubna Gas Filled Recoil Separator. The cross section for the production of 117 and 117 isotopes was measured at five excitation energies of the 117 compound nucleus ranging from 30 to 48 MeV and yielding maximum values of 1.1 pb for the and 2.4 pb for the reaction channels. Alpha emission from Rg competing with spontaneous fission (/SF decay probability 1:9) was observed for the first time leading to the identification of the new isotope Mt ( ms). The measured decay properties are in good agreement with those expected based on the properties of neighboring even- and odd- nuclei. The energies and half-lives of odd- isotopes observed in the 117 and 117 decay chains together with results obtained for lower- superheavy nuclei demonstrate enhanced stability with increasing neutron number toward the predicted new magic number .
- Received 6 April 2013
DOI:https://doi.org/10.1103/PhysRevC.87.054621
©2013 American Physical Society
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This article appears in the following collection:
Transuranium Elements and the Physical Review
This collection marks the 150th anniversary of Dmitri Mendeleev’s discovery of the Periodic Table of Elements.