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Chinese Physics C> 1978, Vol. 2> Issue(2) : 143-150 

THE MEASUREMENT OF THE EXCITATION FUNCTIONS OF ISOTOPES OF Fr AND At, PRODUCED IN THE BOMBARDMENT OF 12C ON 209Bi

  • Excitation functions for Fr and At isotopes produced in 12C on 209Bi had been measured in the energy range 60—72 MeV. It was quite obvious that 213Fr and 214Fr were formed by the reactions 209Bi (12C,4n) 217Ac and 209Bi (12C,3n) 218Ac following the a decay of the Ac isotopes respectively, and 214mFr was produced probably by compound nucleus evaporation of neutrons and an α particle, i.e. (12C, α 3n). 211At was mainly contributed by a multi-nucleon transfer reaction （e.g. 8Be transfer）. The experimental data for neutron evaporation reaction were fitted by the Jackson formula.
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    [1] John M. Alexander and L. Winsberg, Plays. Rev., 121(1961), 529.[2] X. Porrep, A. Г. Дeмин, Л. П. Пaщeнкo, Х, О. Бpинкмaнн, Я#8706;epнαя Фu3uкa, Toм. 4 (1966),246.[3] K. Valli, W. J. Treytl and E. K. Hyde, Phys. Rev., 167(1968), 1094.[4] R. A. Cough and R. D. Macfarlane, Nuclear Reactions Induced by Heavy Ions (1970), p. 673[5] D. F. Torgerson and R. D.Macfarlane, Phys. Rev., C2(1970), 2309.[6] Y. Lebeyec, M. Lefort and M. Sarda, Nucl. Phys., A192(1972), 405.[7] T. Nomura and K.Hiruta, Nucl. Inst. Meth., 108(1973), 61.[8] K. Valli and E. K. Hyde, Phys. Rev., 176(1968), 1377.[9] C. Weiffenbach, S. C. Gujrathi, J. K. P. Lee and A. Fioudayer, Nuct. Inst. Meth., 125(1975), 245,[10] J. C. Hardy, J. E. Esterl, R. G. Sextre and J. Cerny, Phys.Rev., C3(1971), 700.[11] H. Dautet, S. Gujrathi, W. J. Wieshahn, J.M.Dauria and B.D. Pate, Nucl. Inst. Meth., 107,(1973), 49.[12] W. W. Bowman, T. T. Sugihara and R. D. Macfarlane, Nucl. Inst. Meth,, 103(1972), 61.[13] R. Bimbot, D. Gardes and M.F. Rivet, Nncl. Phys., A189(1972), 193.[14] 沈文庆等，高能物理与核物理，1 (1977), 70.[15] 孙其昌等，本期，151.

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GUO JUN-SHENG, SUN XI-JUN, XU XIAO-JI, WANG JUN and LIU HONG-YE. THE MEASUREMENT OF THE EXCITATION FUNCTIONS OF ISOTOPES OF Fr AND At, PRODUCED IN THE BOMBARDMENT OF 12C ON 209Bi[J]. Chinese Physics C, 1978, 2(2): 143-150.
GUO JUN-SHENG, SUN XI-JUN, XU XIAO-JI, WANG JUN and LIU HONG-YE. THE MEASUREMENT OF THE EXCITATION FUNCTIONS OF ISOTOPES OF Fr AND At, PRODUCED IN THE BOMBARDMENT OF 12C ON 209Bi[J]. Chinese Physics C, 1978, 2(2): 143-150. shu
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Received: 1977-08-05
Revised: 1900-01-01
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THE MEASUREMENT OF THE EXCITATION FUNCTIONS OF ISOTOPES OF Fr AND At, PRODUCED IN THE BOMBARDMENT OF 12C ON 209Bi

  • Received Date: 1977-08-05
  • Accepted Date: 1900-01-01
  • Available Online: 1978-04-05

Abstract: Excitation functions for Fr and At isotopes produced in 12C on 209Bi had been measured in the energy range 60—72 MeV. It was quite obvious that 213Fr and 214Fr were formed by the reactions 209Bi (12C,4n) 217Ac and 209Bi (12C,3n) 218Ac following the a decay of the Ac isotopes respectively, and 214mFr was produced probably by compound nucleus evaporation of neutrons and an α particle, i.e. (12C, α 3n). 211At was mainly contributed by a multi-nucleon transfer reaction （e.g. 8Be transfer）. The experimental data for neutron evaporation reaction were fitted by the Jackson formula.

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