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Spectroscopy of heavy fissionable nuclei

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Structural studies of heavy nuclei are quite challenging due to increased competition from fission, particularly at high spins. Nuclei in the actinide region exhibit a variety of interesting phenomena. Recent advances in instrumentation and analysis techniques have made feasible sensitive measurements of nuclei populated with quite low cross-sections. These include K isomers and rotational band structures in isotopes of Pu (Z = 94) to Rf (Z = 104), and octupole correlations in the Th (Z = 90) region. The obtained experimental data have provided insights on various aspects like moments of inertia and nucleon alignments at high spins, quasiparticle energies and evolution of quadrupole and octupole collectivity, among others. An overview of some of these results is presented.

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The results described here were obtained from a series of measurements over the past several years. This work has been possible primarily due to the efforts and contributions from many individuals. The author conveys his sincere thanks to P Chowdhury, T L Khoo, R V F Janssens, D Seweryniak, F G Kondev, I Ahmad, J P Greene, A P Robinson, P T Greenlees, M P Carpenter, T Lauritsen, C J Lister, S Zhu, D Peterson, B Back, X Wang, U Shirwadkar, S Lakshmi, M Hemalatha, A Y Deo, S B Patel, R Palit, T Trivedi, J Sethi, S Saha, S Mukhopadhyay and D C Biswas. The research was supported by the US Department of Energy, Office of Nuclear Physics, under Grants DE-FG02-94ER40848 and DE-AC02-06CH11357 and the Department of Science and Technology, Government of India (Grant No. IR/S2 /PF-03/2003-III).

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TANDEL, S.K. Spectroscopy of heavy fissionable nuclei. Pramana - J Phys 85, 385–394 (2015).

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