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- W2891857978 abstract "Making use of the semiclassical periodic orbit theory (POT), we propose, for the first time, a method to exclusively evaluate the shell effects associated with each of the nascent fragments (prefragments) generated by the neck formation in nuclear fission processes. In spite of the strong indication of such shell effects in asymmetric fragment mass distributions, they could not have been accessed by any previous theoretical approach since most of the single-particle wave functions are delocalized. In the POT, we have found that the prefragment shell effects can be naturally and unambiguously identified as the contributions of the classical periodic orbits localized in each of the prefragments. For a numerical test, simple cavity potential models are employed with the shape described by the three-quadratic-surface shape parametrization. Deformed shell energies are studied with the trace formula for degenerate orbits in a truncated spherical cavity which was recently derived [K. Arita, preceding paper, Phys. Rev. C 98, 064310 (2018)]. In this simple model, it is shown that the prefragment shell effect dominates the total shell energy shortly after the neck formation, and the magicity of the heavier prefragment plays a significant role in establishing the fission saddle with asymmetric shape which leads to an asymmetric scission." @default.
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- W2891857978 date "2018-12-10" @default.
- W2891857978 modified "2023-10-18" @default.
- W2891857978 title "Nascent fragment shell effects on the nuclear fission processes in semiclassical periodic orbit theory" @default.
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- W2891857978 doi "https://doi.org/10.1103/physrevc.98.064311" @default.
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