1 PROJECT Collinear Cluster Tripartition (CCT) Spokesman from the JINR: Dr. D.V. Kamanin Co-spokesman of Germany: Prof. W. von Oertzen Institutes of Germany: HMI Berlin Laboratory of JINR: Flerov Laboratory of Nuclear Reactions Period of realization:

2 CLUSTERING Light exotic nuclei (Halos, skins…) 208 Pb 132 Sn Light N=Z nuclei (nuclear sausages, Hollow nuclei, …)

3 CLUSTERING Light exotic nuclei (Halos, skins…) 208 Pb 132 Sn Light N=Z nuclei (nuclear sausages, Hollow nuclei, …) CCT

4 CLUSTERING Light exotic nuclei (Halos, skins…) 208 Pb 132 Sn Light N=Z nuclei (nuclear sausages, Hollow nuclei, …) Light CCT fragments Hyperdeformation Shell manifestation CCT

5 Layout of the BRS-EUROBALL experiment

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7 Coplanarity angle distributions for fission of 56 Ni *

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12 Our major CCT publications since Yu.V. Pyatkov et al., Proc. Int. Symp. On Exotic Nuclei (EXON- 2001), Baikal Lake, July 24-28, 2001, p Yu.V. Pyatkov et al., Physics of Atomic Nuclei, Vol. 66, No. 9, 2003, p D.V. Kamanin et al., Physics of Atomic Nuclei, Vol. 66, No. 9, 2003, p Yu.V. Pyatkov et al., preprint JINR E W. Trzaska et al., Proc. Seminar on Fission Pont d’Oye V, Belgium, September 2003, p D.V. Kamanin et al., Yu.v.Pyatkov et al., Proc. XVI Int. Workshop on Physics of Nuclear Fission, Obninsk, Russia, Ю.В. Пятков и др., Препринт ОИЯИ Р , Дубна Yu. V. Pyatkov et al., Proc. Int. Conf. “50Years of Shells”, April 1999, Dubna, p Yu.V.Pyatkov, D.V. Kamanin, W. Trzaska et al., EXON-2004

13 Message to Workshop (W. von Oertzen) “The present project seems to be the only the first step for the further experimental and theoretical study of collinear cluster tripartition which will be supported from several groups in perspective on next 10 years”. The most important task detailed experimental study of the Collinear Cluster Tripartition phenomenon in spontaneous and light particle induced fission (n, p, d, alpha, HI) and photofission of nuclei in order - to find experimental evidences for Hyperdeformation in ALL nuclear mass regions as predicted in the Nilsson-Strutinski Method. - to extend a connection between Clustering and Hyperdeformation known for the light systems (N=Z) to the heavy ones. - to gain the Shape of the barrier for true ternary fission

14 ANTICIPATED FEATURES OF THE PROJECT 1.CCT seems to be a new type of radioactive decay of heavy nuclei (as alpha-decay, HI-radioactivity etc) 2. Study of CCT and ternary decays of lighter nuclei is the most effective way to reveal hyper-deformation of nuclei. 3. Feasibility of the project is provided by: * Unique Detector set-ups for coincident measurement and identification of individual fragments: double-arm FOBOS-detectors and BRS plus ancillary detectors for neutrons, gammas, alpha- particles etc - channels for the detailed study of ternary events. * Two experienced powerful scientific groups (FLNR and HMI) already working in the field * developed method approaches aimed at full identification of multi- body decays * first reliable results * excellent price/output value

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Cf +start PAC 3 He counters Standard FOBOS modules (PSAC+BIC)