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 OF¹²C ON²⁰⁹Bi

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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,4 n) ²¹⁷Ac and ²⁰⁹Bi ( ¹²C,3 n) ²¹⁸Ac following the a decay of the Ac isotopes respectively, and ^214mFr was produced probably by compound nucleus evaporation of neutrons and an αparticle, i.e. ( ¹²C, α3 n). 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.

References

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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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通讯作者:陈斌, bchen63@163.com

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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 OF¹²C ON²⁰⁹Bi

Received Date:1977-08-05

Accepted Date:1900-01-01

Available Online:1978-04-05

Abstract:Excitation functions for Fr and At isotopes produced in¹²C on²⁰⁹Bi had been measured in the energy range 60—72 MeV. It was quite obvious that²¹³Fr and²¹⁴Fr were formed by the reactions²⁰⁹Bi (¹²C,4n)²¹⁷Ac and²⁰⁹Bi (¹²C,3n)²¹⁸Ac following the a decay of the Ac isotopes respectively, and^214mFr was produced probably by compound nucleus evaporation of neutrons and anαparticle, i.e. (¹²C,α3n).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 OF¹²C ON²⁰⁹Bi

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