Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002asap.conf..184b&link_type=abstract
ASTROPHYSICS, SYMMETRIES, AND APPLIED PHYSICS AT SPALLATION NEUTRON SOURCES. Proceedings of the Workshop on ASAP 2002. Held 11-1
Astronomy and Astrophysics
Astrophysics
Scientific paper
It is considered the multimode neutron induced fission going via neutron resonances (NR) as a unique possibility to observe and to study interference phenomena in nuclear fission or quantum mechanical aspects of the process. The P-even and P-odd angular correlations of fission fragments (FF) are discussed in terms of the formal theory of (n,f) reaction in a helicity representation developed recently by authors. Due to the proper account of total space parity in FF channels and specific advantages of the helicity representation for these exit channels it becomes possible to calculate the reduced fission amplitudes and to sum the general expression for the differential cross section of (n,f) - reaction over all non observed characteristics of FF. After the summation the observed angular correlations could be expressed via the reduced S-matrix defined with aid "integral" fission amplitudes specified for the JπK (A.Bohr's) fission channels. The conditions necessary for "survival" of FF angular correlations (after summation over huge number of exit channels with random fission amplitudes) are discussed in connection with a spontaneous violation of the shape symmetry of fissioning nucleus on the way from the normal to scission deformation. In all consideration it is assumed that space parity violation in fission process takes place at the stage of compound nucleus before an "exit" to the transition state of fission. Some examples of theoretical analysis of experimental data relevant to the subject under discussion are presented. The results show possibility to study a dependence of fission barriers on parity and to get more deep insight in the nature of transition states of fissioning nuclei. It means that such study provides some new tools to investigate properties of nuclei at extremely high deformation. In conclusion it is discussed some open problems as the tasks for future experimental and theoretical study.
Barabanov A.
Furman W.
Popov Aleksander
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