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Chinese Physics C> 1982, Vol. 6> Issue(3) : 365-372 

CHARGE DISTRIBUTION IN THE FISSION OF 232Th BY 14MeV NEUTRON

  • Independent yields of 82Br, 96Nb, 112Ag, 130I,132I, 134I, 134mCs, 135mCs, 136Cs and upper limitof independent yield for 140La in the fission of 232Th induced by neutrons of 14 MeVwere determined with nuclear chemistry techniques. The correlation of the fractionalindependent yields in the high yield mass chains with a Gaussian curve of charge dis-tribution has been investigated using various mass formulae and charge distributionhypotheses. The results indicate that the hrpothesis of minimum potential energy witha shell-effected mass equation gives the best fit to the data. The width parameter Cof the charge distribution is found to be 0.80. The large deviations of 32Br and 112Ag from the Gaussian curve seem to show that the low yield in very asymmetric fissioncan be attributed to a narrower width of charge distribution, whereas the high yield insymmetric fission may correlate with a wider width. The trends have been explainedqualitatively in terms of a liquid drop model. There is no evidence for 40-proton subshell effect on the fission yield.
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    [1] 李文新等,核化学与放射化学,2(1980), 9.[2] S. A. Rao; Phys,Rev. C5(1972), 171.[3] S. A: Rao and P. K. Kuroda, J. Inorg. Nual. Chem.,35(1973); 1443.[4] A.C. Wahl, et al., Phys. Rev,126(1962), 1112.[5] A.C.Wahl. et al.,in Proceeding of the Second International Symposiuw on the Physics and Chemistry of Fission, Vienna, p. 813, 1969.[6] J.V. Kratz et al., Phys. Rev., C13(1976), 2347.[7] J.L. Galinier and L. Yaffe, J. Inorg. Nucl. Chem., 39(1977), 1497.[8] Li Wnxin, et al., Proceodinga Of the International Oonference on Nuclear Phyaica (Aug. 24-30 Berkeley,California), p. 928.[9] 中国科学院近代物理研究所核化学组,高能物理与核物理,2(1978), 343.[10] F. L.Mgore, Anal. Chem., 27(1955), 70.[11] D. L. Swindle et al., J. Inorg. Nucl. Chem., 33 (1971), 651.[12] 核素图表编制组,“核素常用数据表”,原子能出版社,1977.[13] I. Binder et al., LRL-6515 (1977).[14] K. F. Flynn et al., ANL-7749(1970).[15] D. R. Nethawap et al., Phys. Rev., C16(1977),1901.[16] A. E. S. Green, Phys. Rev., 95(1954), 1006.[17] G. Friedlander et al., "Nuclear and Radiochemistry", John Wiley and Sous, Inc., New York,London, Sydney.[18] H. B. Levy. Phys. Rev., 106 (1957). , 1265.[19] C. D. Coryell, Annu. Rev. Nucl Sci., 2(1953), 305.[20] R. Vandenboach and J. R. Huizenga, In Proc. and Inter. Conf. Peaceful Uaee of Atomic Energy, 15(1958), 284.[21] A, O. Denschlae and S. M. Qain, J. Inorg. Nucl. Chem., 33(1971), 3649.[22] S. C. Burnett, Phys. Rev. Lett., 21(1968), 1350.[23] L. A. Gevaert et al., Canadian J. of Chem., 48(1970), 641.[24] D. R. NethawaY and B, Mendoza, Phys. Rev., C6(1972), 1827.[25] H, Wolfaberg, Phys. Rev., 137, 4B, (1985), 929.[26] J. P. Bocquet et al., Nuclear Physics, A189(1972), 556.[27] N. A. Wogman, Phys. Rev., 152(1965), 1088.[28] D. R, Nethaway and B. M. endoza, Phys. Rev,, C6(1972), 1821.[29] E. Jacobe et al., Phys. Rev., C21(1980), 237.[30] H. F. Flynn and L. E, Glendenin, J. Inorg. Nucl. Chem., 37(1975), 869.[31] A. Gaggeleer et al., J. Inorg. Nucl. Chem., 38(1976), 205.[32] H. Gaggeler and H. R. Yon Gunten, Phys. Rev., C17(1978), 172.[33] С. А. Карамян и др., Я#8706;ернαя ФμЗμкα, 9(1969), 715.

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LI WEN-XIN, SUN TONG-YU, SUN XIU-BUA, ZHANG TIAN-MEI, ZHENG MAN-JIAO, DONG TIAN-RONG and FU MING. CHARGE DISTRIBUTION IN THE FISSION OF 232Th BY 14MeV NEUTRON[J]. Chinese Physics C, 1982, 6(3): 365-372.
LI WEN-XIN, SUN TONG-YU, SUN XIU-BUA, ZHANG TIAN-MEI, ZHENG MAN-JIAO, DONG TIAN-RONG and FU MING. CHARGE DISTRIBUTION IN THE FISSION OF 232Th BY 14MeV NEUTRON[J]. Chinese Physics C, 1982, 6(3): 365-372. shu
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Received: 1981-09-11
Revised: 1900-01-01
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CHARGE DISTRIBUTION IN THE FISSION OF 232Th BY 14MeV NEUTRON

  • Received Date: 1981-09-11
  • Accepted Date: 1900-01-01
  • Available Online: 1982-06-05

Abstract: Independent yields of 82Br, 96Nb, 112Ag, 130I,132I, 134I, 134mCs, 135mCs, 136Cs and upper limitof independent yield for 140La in the fission of 232Th induced by neutrons of 14 MeVwere determined with nuclear chemistry techniques. The correlation of the fractionalindependent yields in the high yield mass chains with a Gaussian curve of charge dis-tribution has been investigated using various mass formulae and charge distributionhypotheses. The results indicate that the hrpothesis of minimum potential energy witha shell-effected mass equation gives the best fit to the data. The width parameter Cof the charge distribution is found to be 0.80. The large deviations of 32Br and 112Ag from the Gaussian curve seem to show that the low yield in very asymmetric fissioncan be attributed to a narrower width of charge distribution, whereas the high yield insymmetric fission may correlate with a wider width. The trends have been explainedqualitatively in terms of a liquid drop model. There is no evidence for 40-proton subshell effect on the fission yield.

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