Affiliation: | 1. Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), R-76900, Bucharest, Romania 2. Institute for Nuclear Research and Nuclear Energy (INRNE), Bulgarian Academy of Sciences, Sofia, Bulgaria 3. St. Kliment Ohridski University, Sofia, Bulgaria 4. CEA, DAM, DIF, F-91297, Arpajon, France 5. CSNSM, F-91404, Orsay, France
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