A Suggestion Complementing the Magic Numbers Interpretation of the Nuclear Fission Phenomena
- 1 F. Menegus V. Europa, Bussero, Italy
Abstract
Ideas, solely related on the nuclear shell model, fail to give an interpretation of the experimental central role of 54 Xe in the asymmetric fission of actinides. The same is true for the β -delayed fission of 180 Tl to 80 Kr and 100 Ru. The representation of the natural isotopes, in the Z-Neutron Excess plane, suggests the importance of the of the Neutron Excess evolution mode in the fragments of the asymmetric actinide fission and in the fragments of the β -delayed fission of 180 Tl. The evolution mode of the Neutron Excess, hinged at Kr and Xe, is directed by the 50 and 82 neutron magic numbers. The present isotope representation offers a frame for the interpretation of the post fission evaporation of neutrons, higher for the A L compared to the AH fragments, a tenet in nuclear fission. Further enlightened is the functional meaning of the 50 proton magic number, marking the start of the yield rise of the A H fragments in actinide fission.
- Bohr, N. and Wheeler, J.A. (1939) The Mechanism of the Nuclear Fission. Physical Review, 56, 426.
- Meitner, L. and Frisch, O.R. (1939) Products of the Fission of the Uranium Nucleus. Nature, 143, 471-472. https://doi.org/10.1038/143471a0
- Hamamoto, I. and Mottelson, B.R. (2012) Shape Deformation in Atomic Nuclei. Scholarpedia, 7, 10693. https://doi.org/10.4249/scholarpedia.10693
- Frankel, S. and Metropolis, N. (1947) Calculations in the Liquid-Drop Model of Fission. Physical Review, 72, 914. https://doi.org/10.1103/PhysRev.72.914
- Swiateski, W.J. (1955) Systematics of Spontaneous Fission Half-Lives. Physical Review, 100, 937. https://doi.org/10.1103/PhysRev.100.937
- Goeppter Mayer, M. (1963) The Shell Model. Nobel Lecture. http://www.nobelprize.org/nobel_prizes/physics/laureates/1963/mayer/lecture.html
- Jansen, J.H.D. (1963) Glimpses at the History of the Nuclear Structure Theory. Nobel Lecture. http://www.nobelprize.org/nobel_prizes/physics/laureates/1963/jensen/lecture.html
- Strutinsky, W.M. (1967) Shell Effects in Nuclear Masses and Deformations Energies. Nuclear Physics A, 95, 420-444. https://doi.org/10.1016/0375-9474(67)90510-6
- Strutinsky, W.M. (1968) Shells in Deformed Nuclei. Nuclear Physics A, 122, 1-33. https://doi.org/10.1016/0375-9474(68)90699-4
- Gönnenwein, F. (2014) Neutron-Induced Fission. The Ecole Joliot Curie, Frejus. http://ejc2014.sciencesconf.org/conference/ejc2014/pages/goennenwein2.pdf
- Möller, P., Madland, D.G. and Ivamoto, A. (2001) Nuclear Fission Modes and Fragment Mass Asymmetries in Five-Dimensional Deformation Space. Nature, 409, 785-790. https://doi.org/10.1038/35057204
- Schmidt, K.-H., Benlliure, J. and Junghans, A.R. (2001) Fission of Nuclei Far from Stability. Nuclear Physics A, 693, 169-189. https://doi.org/10.1016/S0375-9474(01)00648-0
- Schmidt, K.-H. and Jurado, B. (2012) Global View on Fission Observables-New Insights and New Puzzles. Physics Procidia, 31, 147-157. https://doi.org/10.1016/j.phpro.2012.04.020
- Schmidt, K.-H. and Jurado, B. (2014) General View on the Progress in Nuclear Fission: A Review. HAL Id: in2p3-01314814. http://hal.in2p3.fr/in2p3-01314814
- Rochman, D., Tsekhanovich, I., Gonnenwein, F., Sokolov, V., Storrer, F., Simpson, G. and Serot, O. (2004) Super-Asymmetric Fission in the 245Cm(nth, f) Reaction at the Lohengrin Fission-Fragment Mass Separator. Nuclear Physics A, 735, 3-20. https://doi.org/10.1016/j.nuclphysa.2004.01.121