Volume 118, Number 2, April 2017
|Number of page(s)||5|
|Published online||26 June 2017|
Cluster preformation at the nuclear surface in cold fission
Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) - P.O. Box MG-6, RO-077125 Bucharest-Magurele, Romania and Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University - Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany
Received: 28 January 2017
Accepted: 8 June 2017
Microscopic theories of alpha decay and cluster radioactivity explain these decay modes as a quantum tunnelling of a preformed cluster at the nuclear surface. In the present work we show that in a spontaneous cold-fission process the shell plus pairing corrections, calculated with Strutinsky's procedure based on the two-center shell model, may give a strong argument for preformation of a light fission fragment near the nuclear surface. It is obtained when the radius of the light fragment, R2, is increased linearly with the separation distance, R, of the two fragments, while for R2 = const one gets the well-known two-hump potential barrier for heavy and superheavy nuclei. Nuclear-physics community also contributed to nanocluster physics by applying the macroscopic-microscopic method to explain the shell effects experimentally observed since 1984. Applications are shown for two nuclei, 260Rf and 264Sg, whose half-life against spontaneous fission is very well known. We stress a new aspect of the cold spontaneous fission, unifying its theory with that of α- and cluster decays, all having in common a preformed light cluster which will penetrate the potential barrier by quantum tunelling.
PACS: 25.85.Ca – Spontaneous fission / 24.75.+i – General properties of fission / 21.60.Cs – Shell model
© EPLA, 2017
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.