Abstract
The fragment mass and energy distributions have been measured for fission of213At,212Po,210Po,208Po,209Bi,207Bi,205Bi,204Pb and201Tl in (α, f) and (p, f) reactions. The yield of the asymmetric component has been found to decrease with decreasingZ andN of the fissile nucleus and vanish at201Tl. The analysis has shown the two main fission modes (symmetric and asymmetric) to be determined by the two distinct valleys in the deformation potential energy, which had been theoretically predicted by Pashkevich. The boundaries of validity of the hypothesis of two distinct fission modes have been estimated at 200 <A < 232 and 82 <Z < 92. The two-mode hypothesis is strongly substantiated in the paper.
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Gruzintsev, Ye.N., et al.: Pisma Zh. Eksp. Teor. Fiz.35, 449 (1982)
Gruzintsev, Ye.N., et al.: Pisma Zh. Eksp. Teor. Fiz.36, 304 (1982)
Gruzintsev, Ye.N., et al.: Phys. Lett.126B, 428 (1983)
Gruzintsev, Ye. N., et al.: Inst. Nucl. Phys. Acad. Sci. Kaz. SSR, Preprint 1-83 (1983)
Flynn, K.F., Gunten, H.R. von: Proc. Snd IAEA Symp. Phys. Chem. Fission, Vienna,2, 731 (1969)
Schmitt, H.W., Dabbs, J.W.T., Miller, P.D.: Proc. 1st IAEA Symp. Phys. Chem Fission, Salzburg,1, 517 (1965);
Konecny, E., Schmitt, H.W.: Phys. Rev.172, 1213 (1968)
Kurchatov, B.V., et al.: Yad. Fiz.14, 943 (1971)
Okolovich, V.N., Pavlov, A.F.T., Tishin, A.S.: Yad. Fiz.21, 699 (1975)
Britt, H.C., Wegner, H.E., Gursky, J.C.: Phys. Rev.129, 2239 (1963)
Specht, H.J.: Nucleonika20, 717 (1975)
D'yachenko, P.P., Kuzminov, B.D., Tarasko, M.Z.: Yad. Fiz.8, 286 (1968)
Pashkevich, V.V.: Nucl. Phys. A169, 275 (1971)
Mustafa, M.G., Mosel, U., Schmitt, H.W.: Phys. Rev. C7, 1519 (1973)
Ignatjuk, A.V., et al.: Proc. 4th IAEA Symp. Phys. Chem. Fission, Jülich,1, 421 (1979)
Strutinsky, V.M.: Zh. Teor. Eksp. Fiz.45, 1900 (1963)
Gruzintsev, Ye.N., et al.: Z. Phys. A — Atoms and Nuclei316, 61 (1984); Yad. Fiz.39, 1336 (1984)
Kooks, I.M., et al.: Yad. Fiz.27, 864 (1978)
Perry, D.G., Fairhall, A.W.: Phys. Rev. C4, 977 (1971)
Turkevich, A., Niday, J.B.: Phys. Rev.84, 52 (1951)
Zhagrov, E.A., et al.: Nucl. Phys. A213, 436 (1973)
Weber, J., et al.: Phys. Rev. C13, 2413 (1976)
Unik, J.P., et al: Proc. 3rd IAEA Symp. Phys. Chem. Fission, Rochester,2, 19 (1973)
Deruytter, A.: Ibid., p. 51; John, W., et al.: Phys. Rev. Lett.27, 45 (1971)
Viola, V.E.: Nucl. Data, A1, 391 (1966);
Borderie, B., et al.: Nucl. Phys. A220, 93 (1974)
Gruzintsev, Ye.N. et al.: Inst. Nucl. Phys. Acad. Sci. Kaz. SSR, Preprint 2-84 (1984); Yad. Fiz.40, 616 (1984)
Plasil, F., et al.: Phys. Rev.142, 696 (1966); Phys. Rev. C5, 528 (1972)
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Itkis, M.G., Okolovich, V.N., Rusanov, A.Y. et al. Asymmetric fission of the pre-actinide nuclei. Z Physik A 320, 433–441 (1985). https://doi.org/10.1007/BF01415720
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DOI: https://doi.org/10.1007/BF01415720