Beta-delayed fission in the lead region

Lead Research Organisation: University of York
Department Name: Physics


Recently, in the year 2008, the 70th anniversary of nuclear fission, which was discovered in 1938 by Otto Hahn and Fritz Strassmann, was celebrated. In the next 15 years since the discovery a few landmark developments in nuclear fission and its application have followed, including among others, the creation of the first man-made nuclear reactor in 1942, the first atomic bomb explosion (1945) and the first generation of electricity by a nuclear reactor in 1951. The world's first commercial nuclear power station, Calder Hall in Sellafield, UK was opened in 1956. Since then, the nuclear fission and its applications became omnipresent both in science and in our day-by-day life. According to the World Nuclear Association, globally during the 1980s one new nuclear reactor started up every 17 days on average. In the year 2007, 14% of the world's electricity came from nuclear power. As of September 2009 in 31 countries 436 nuclear power plant units with an electric net capacity of about 370 GW are in operation and 53 plants with an installed capacity of 47 GW are in 15 countries under construction. In the UK, in 2009, nearly one fifth of the electricity was generated by the existing 19 nuclear power reactors. Following the UK Government's January 2008 decision to support the building of new nuclear power stations, plans have been announced to open four new plants in the UK by 2017. The programme described in this Standard Grant application covers research into nuclear fission and has both scientific and society- oriented impact and outreach. In fundamental research, one of the main goals of our research programme is to achieve a better understanding of the fission process and fission properties of very exotic nuclei. The specific type of the nuclear fission studied in this project - exotic beta-delayed fission - is believed to occur in the astrophysical r-process, which is responsible for production of the heaviest elements in Universe. In particular, theorists suggest that beta-delayed fission, together with the spontaneous and neutron-induced fission, is responsible for the so-called fission recylcing and the r-process termination by fission, the latter establishing the limit for the heaviest elements production in Nature. To achieve our goals, we will exploit a combination of charged-particle, fission and gamma-ray spectroscopy by using three complementary techniques: the mass separator ISOLDE (CERN, Geneva, Switzerland), the velocity filter SHIP (GSI, Darmstadt, Germany) and the fission spectrometer of the Japan Atomic Energy Agency (JAEA, Tokai, Japan). Society-wise, in view of the new initiatives on nuclear power development by the UK government, many new specialists in nuclear industry will be required in the coming years. Our project, apart of pure fundamental nuclear fission research, will also provide the much needed specialized training of the young post-graduate students and post-doctoral researchers in the radiation and nuclear fission applications, detectors and techniques, including the nuclear waste management. .


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Kalaninov√° Z (2013) a decay of the very neutron-deficient isotopes 197 - 199 Fr in Physical Review C

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Seliverstov M (2013) Charge radii of odd-A 191-211Po isotopes in Physics Letters B

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Andreyev A (2013) Colloquium : Beta-delayed fission of atomic nuclei in Reviews of Modern Physics

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Kalaninov√° Z (2014) Decay of 201 - 203 Ra and 200 - 202 Fr in Physical Review C

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Venhart M (2012) Determination of a-decay branching ratios for 178, 179Hg in The European Physical Journal A

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Cocolios T (2012) Early onset of deformation in the neutron-deficient polonium isotopes in Journal of Physics: Conference Series

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Sagaidak R (2014) Effects of beam energy distribution on fusion-evaporation excitation functions in International Journal of Modern Physics E

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Seliverstov M (2014) Electromagnetic moments of odd- A Po 193 - 203 , 211 isotopes in Physical Review C

Related Projects

Project Reference Relationship Related To Start End Award Value
ST/H008691/1 25/04/2011 31/08/2012 £230,714
ST/H008691/2 Transfer ST/H008691/1 01/09/2012 30/04/2014 £82,138
Description Beta-delayed fission was studied by means of modern methods combining selective laser ionization technique with precise nuclear decay measurements.
Exploitation Route
Sectors Energy

Description Collaboration with the Japanese Atomic Energy Agency (JAEA) 
Organisation Japan Atomic Energy Agency (JAEA)
Country Japan 
Sector Public 
PI Contribution I have performed a very successful experiment at JAEA in Feb.2010. The JAEA partners provided their detection setup.
Collaborator Contribution JAEA provides their detectors to my experiments JAEA pays for the beam time provided to my experiments
Impact data analysis from '2010 experiment is underway, a paper will be prepared soon
Start Year 2010
Description ISOLDE(CERN) 
Organisation European Organization for Nuclear Research (CERN)
Department ISOLDE Radioactive Ion Beam Facility
Country Switzerland 
Sector Public 
PI Contribution ISOLDE pays for beam time
Collaborator Contribution ISOLDE pays for the beam time provided to my experiments
Impact a paper in under preparation
Start Year 2010