Seminarium Fizyki Jądra Atomowego
sala 1.01, ul. Pasteura 5
2026-05-21 (10:15) 
dr hab. Michał Warda, prof. UMCS (Lublin)
Cluster radioactivity: exotic process or dominant nuclear decay
Most heavy and super-heavy nuclei decay through fission or alpha emission, but other decay modes can also be noticed. In the 1980s, an exotic decay of cluster radioactivity was observed in actinides [1, 2, 3]. A light nucleus, but heavier than an alpha particle, is emitted in this process. The heavy mass residue is a doubly magic 208Pb in all observed decays of this type.
The theoretical description of this process as a very asymmetric fission has been successfully carried out in the HFB model [4]. The analysis of cluster radioactivity fission valley on the potential energy surface has been extended to heavier isotopes. It has been found that the analog process, with lead as one of the fragments, can be noticed even in super-heavy nuclei [5]. Moreover, the asymmetric fission of cluster radioactivity type plays a non-negligible role in this region. In some cases, in the region around 284Cn, it may be even the dominant fission channel.
We also delimit the region in the chart of nuclides where super-asymmetric fission paths exist and set the limits for the cluster radioactivity decay mode [6]. Selected isotopic and isotonic chains in the region of heavy and super-heavy nuclei will be investigated to find the evolution of the super-asymmetric fission valley with increasing number of protons and neutrons.
[1] H.J. Rose and G.A. Jones, Nature (London) 307, 245 (1984).
[2] A. Sandulescu, D.N. Poenaru, and W. Greiner, Sov. J. Part. Nucl. 11, 528 (1980).
[3] R. Bonetti and A. Guglielmetti, in Heavy Elements and Related Phenomena, Vol. II, edited by W. Greiner and R.K. Gupta (World Scientific, Singapore, 1999), p. 643.
[4] M. Warda, and L.M. Robledo, Physical Review C 84, 044608 (2011).
[5] M. Warda, A. Zdeb, and L.M. Robledo, Physical Review C 98, 041602 (2018).
[6] M. Warda, A. Zdeb, and R. Rodriguez-Guzman, Physical Review C 113, 034619 (2026).
The theoretical description of this process as a very asymmetric fission has been successfully carried out in the HFB model [4]. The analysis of cluster radioactivity fission valley on the potential energy surface has been extended to heavier isotopes. It has been found that the analog process, with lead as one of the fragments, can be noticed even in super-heavy nuclei [5]. Moreover, the asymmetric fission of cluster radioactivity type plays a non-negligible role in this region. In some cases, in the region around 284Cn, it may be even the dominant fission channel.
We also delimit the region in the chart of nuclides where super-asymmetric fission paths exist and set the limits for the cluster radioactivity decay mode [6]. Selected isotopic and isotonic chains in the region of heavy and super-heavy nuclei will be investigated to find the evolution of the super-asymmetric fission valley with increasing number of protons and neutrons.
[1] H.J. Rose and G.A. Jones, Nature (London) 307, 245 (1984).
[2] A. Sandulescu, D.N. Poenaru, and W. Greiner, Sov. J. Part. Nucl. 11, 528 (1980).
[3] R. Bonetti and A. Guglielmetti, in Heavy Elements and Related Phenomena, Vol. II, edited by W. Greiner and R.K. Gupta (World Scientific, Singapore, 1999), p. 643.
[4] M. Warda, and L.M. Robledo, Physical Review C 84, 044608 (2011).
[5] M. Warda, A. Zdeb, and L.M. Robledo, Physical Review C 98, 041602 (2018).
[6] M. Warda, A. Zdeb, and R. Rodriguez-Guzman, Physical Review C 113, 034619 (2026).