DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION

LIU GUO-XING; CHEN KE-LIANG; MA HONG-FAN; WANG SU-FANG; CAI WEI

Chinese Physics C> 1982, Vol. 6> Issue(6) : 737-742

DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION

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We have measured the angular distributions of fission fragnents for a series ofcompound nuclei formed in the bombardment of ¹⁸¹Ta, W, Re, Pt, ¹⁹⁷Au, Pb and ²⁰⁹Biby 72.7, 69.6, 67.4, 65.4, 63.4 and 61.4 MeV ¹²C ions with mica track detectors. Thecritical angular momentum l_cr. can be determined directly from the statistical analysisof the fission fragment angular distribution corresponding to the fission events withfull momentum transfer. The complete fusion cross section σ_fu were calculated on thebasis of the sharp cut-off model. The results for l_cr obtained by this method were com-pared with those predicted by R. Bass model. The published data on fission fragmentangular distributions of ¹⁴N+Pb and ¹²C+²³⁸U reactions were also analyzed by thismethod. The values of σ_fu are found to be in good agreement with the direct comple-te fusion cross section measurements.

References

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В. Длитиев и др. Ядер фнз. 26(1977), 956.[2] P. K. Choudhury et al., Nucl. Phys., A239(1978), 224. Phys. Rev., C22(1980), 1360.[3] 低能核物理资料汇编, 原子能出版社.(1974),158.[4] J. R. Huizenga et al., Phys. Rev., 177(1976), 1806.[5] S. Cohen and W. Stwiateke, Ann.phys, 22(1963), 406.[6] 刘国兴等, 高能物理与核物理2(1978), 242.[7] R. Vandenboah and J. R. Huizenga, Nuclear Fission, P. 233. Acedqmic Press, New York and London, 1973.[8] W. D. Myers et al., UGRL-11980 (1965).[9] R. Bass,Nuclear Reactions with Heavy Ions, p. 326. Springer verlag, Iserlin Heidelberg New York, 1980.[10] T. D. Thomas, Phys. Rev., 116(1959), 703.V. E. viola et al., Phys. Rev., 128(1962), 767.[11] 中国科学院近代物理研究所, 科学技术报告汇编.第二集(1976), 1,第三集(1979), 50[12] T. Sikkeland et al., Phys. Rev., 123 (1961), 2112.[13] T. Sikkeland et al., Phys. Rev., 125(1962), 1350. Phys. Lett., 31B(1963), 451.

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LIU GUO-XING, CHEN KE-LIANG, MA HONG-FAN, WANG SU-FANG and CAI WEI. DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION[J]. Chinese Physics C, 1982, 6(6): 737-742.

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Received: 1981-09-18
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

DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION

Received Date: 1981-09-18
Accepted Date: 1900-01-01
Available Online: 1982-12-05

Abstract: We have measured the angular distributions of fission fragnents for a series ofcompound nuclei formed in the bombardment of ¹⁸¹Ta, W, Re, Pt, ¹⁹⁷Au, Pb and ²⁰⁹Biby 72.7, 69.6, 67.4, 65.4, 63.4 and 61.4 MeV ¹²C ions with mica track detectors. Thecritical angular momentum l_cr. can be determined directly from the statistical analysisof the fission fragment angular distribution corresponding to the fission events withfull momentum transfer. The complete fusion cross section σ_fu were calculated on thebasis of the sharp cut-off model. The results for l_cr obtained by this method were com-pared with those predicted by R. Bass model. The published data on fission fragmentangular distributions of ¹⁴N+Pb and ¹²C+²³⁸U reactions were also analyzed by thismethod. The values of σ_fu are found to be in good agreement with the direct comple-te fusion cross section measurements.

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DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION

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[1]	Yu Hong , Shen Qixing , Zhang Lin . Angular Distribution of Process e⁺e^－→τ⁺τ^－,τ^－→a₁υτ,a₁→ρπ and Characteristics of a₁ Meson. Chinese Physics C, 1994, 18(7): 583-590.
[2]	WU Zhong-Li . ANALYSIS OF THE MOMENTUM DISTRIBUTION WIDTH OF THE PREOJECTILE-LIKE-FRAGMENT FROM HEAVY ION COLLISIONS. Chinese Physics C, 1989, 13(8): 752-754.