Chinese Physics C > 1978, Vol. 2 > Issue(3): 242-248

ANGULAR DISTRIBUTIONS OF FISSION FRAGMENTS AND THE SHAPES OF THE SADDLE POINT OF COMPOUND NUCLEI

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Abstract：
We have measured the angular distributions of fission fragments for a series of compound nuclei formed in the bombardment of ¹⁶⁹Tm, ¹⁷⁵Lu, ¹⁸¹Ta, ¹⁹⁷Au, ²⁰⁹Bi, ²³²Th and ²³⁸U by 78 MeV ¹²C ions and in the bombardment of natural lead by 96.6, 92.2, 88.1, 79.0 and 75.6 MeV ¹⁴N ions with mica track detectors. All the measured angular distributions can be fitted by the theoretical formula given by Halpern and Strutinski. The effective moments of inertia of the fissioning nuclei at the saddle point are derived from the angular distribution anisotropies. A comparison is made for the shapes of experimental saddle point with the theoretical predictions by the liquid drop model.

References

[1]

I. Halpern and V. M. Strutinski, "Preceedinga of the Second United Nations International Conference on the Peaceful Uses of Atomic Energy”，15, 408.[2] J. R. Huizenga et al., Phys. Rev., 126(1962), 220.[3] R. .F. Reising et al., Phys. Rev., 141(1966), 1161.[4] К. Г. Кyватов и др., я#8706;ер Фцэ, 14 (1971), 79.[5] C. A. Карaмян идр., я#8706;ер Фцэ, 6 (1967), 494.[6] B. M. Cтpyтинский, я#8706;ер Фцэ, 1 (1965), 821.[7] 核物理研究室，高能物理与核物理，1, (1977), 65.[8] R. vandenbosch and J. R. Huizenga "Nuclear Fission", 199.[9] S. Conhen and W. J. Swiatecki, Ann. Phys., 22(I963), 406.

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LIU GOU-XING, WANG ZJO-GOU, YIN SHU-ZHI, HAO BIN-GAN, YUAN SHUANG-GUI and XIA XING-SHUO. ANGULAR DISTRIBUTIONS OF FISSION FRAGMENTS AND THE SHAPES OF THE SADDLE POINT OF COMPOUND NUCLEI[J]. Chinese Physics C, 1978, 2(3): 242-248.

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Received: 1977-08-15
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

ANGULAR DISTRIBUTIONS OF FISSION FRAGMENTS AND THE SHAPES OF THE SADDLE POINT OF COMPOUND NUCLEI

Received Date:1977-08-15
Accepted Date:1900-01-01
Available Online:1978-06-05

Abstract:We have measured the angular distributions of fission fragments for a series of compound nuclei formed in the bombardment of¹⁶⁹Tm,¹⁷⁵Lu,¹⁸¹Ta,¹⁹⁷Au,²⁰⁹Bi,²³²Th and²³⁸U by 78 MeV¹²C ions and in the bombardment of natural lead by 96.6, 92.2, 88.1, 79.0 and 75.6 MeV¹⁴N ions with mica track detectors. All the measured angular distributions can be fitted by the theoretical formula given by Halpern and Strutinski. The effective moments of inertia of the fissioning nuclei at the saddle point are derived from the angular distribution anisotropies. A comparison is made for the shapes of experimental saddle point with the theoretical predictions by the liquid drop model.