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

GUO JUN-SHENG; SUN XI-JUN; XU XIAO-JI; WANG JUN; LIU HONG-YE

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

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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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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.

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Received: 1977-08-05
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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

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

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