Quasifision timescale: Zeptosecond versus attosecond
1 Variable Energy Cyclotron Center, 1/AF Bidhannagar, Kolkata - 700064, India
2 RaniganjGirls’ College, Raniganj, Bardhaman - 713358, West Bengal, India
Corresponding author: email@example.com
Published online: 29 January 2015
Recently a controversy has developed regarding the timescales of quasifission and fission processes of highly excited (EX > 50 MeV) transuranium and uranium-like nuclei. The mass-angle distributions of quasifission fragments indicate exponential decay law giving timescale of the order of 10-21 sec for the quasifission process, whereas for the similar reactions, timescale of the order of 10-18 sec were obtained from the crystal blocking technique. In the case of fission of highly excited uranium-like and transuranium nuclei, X-ray-fission fragment coincidence technique gives similar timescales ~10-18 sec, contradicting much shorter timescales obtained from nuclear techniques. We think the quantum decoherence time of the quasifission/fission decay process could be of the order of 10-18 sec and present a quantum mechanical explanation to resolve the puzzle.
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