THE MEASUREMENT OF COMPLETE FUSION CROSS-SECTIONS FOR THE REACTIONS 12C+27Al, 12C+209Bi AND 14N+Pb

SUN CHI-CHANG; HE YI SHEN; JIU-SHENG; CHEN HOU; CHEN KE-LIANG

Chinese Physics C> 1978, Vol. 2> Issue(2) : 151-157

THE MEASUREMENT OF COMPLETE FUSION CROSS-SECTIONS FOR THE REACTIONS ¹²C+²⁷Al, ¹²C+²⁰⁹Bi AND ¹⁴N+Pb

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Abstract：
Mica track detectors were used for the measurement of evaporation residues and fission fragments of compound nuclei formed in ¹²C+²⁷Al, ¹²C+²⁰⁹Bi and ¹⁴N+Pb reactions. The complete fusion cross-sections and excitation functions were then obtained. By using the sharp cut-off model approximation, the values of the critical angular momenta were extracted from the complete fusion cross-sections. The results obtained were compared with the calculations based on current theories for critical angular momentum; they were found to agree within experimental uncertainties.

References

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L. Kowalski et al., Phys. Rev., 169(1968), 894.[2] J. Natowitz et al., Phys. Rev., C1(1970), 623.[3] J. Natowitz et al., Phys. Rev., C6(1972), 2133.[4] H. Blok et al., N. I. M., 100 (1972 ) , 403.[5] V. E. Viola, UCRL-9619 (1961).[6] 刘国兴等，待发表.[7] T. D. Thomas, Phys. Rev., 116(1959), 703. V. E. Viola et al., Pleys. Rev., 128(1962), 767.[8] C. Поликонов и. дp., ЖЭТФ., 36 (1959), 745.[9] H. Britt et al., Phys. Rev., 120(1961), 1768.[10] 郭俊盛等，本期，143.[11] 吴国华等，未发表.[12] D. Glas and U. Morel, Nucl. Plays., A237(1975), 429.[13] J. Galin et al., Phys. Rev., C9(1974), 1018.[14] 徐树威等，未发表.[15] E. T. Chulick et al., Proc. IAEA, Symp. Phys. Chem. Fission Third, Vol. II p. 379, IAEA, Vienna.[16] Nguyen Van Sen et al., European Conference on Nuclear Physics with Heavy Ions (Caen, 6- 10, Sept., 1916).

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SUN CHI-CHANG, HE YI SHEN, JIU-SHENG, CHEN HOU and CHEN KE-LIANG. THE MEASUREMENT OF COMPLETE FUSION CROSS-SECTIONS FOR THE REACTIONS ¹²C+²⁷Al, ¹²C+²⁰⁹Bi AND ¹⁴N+Pb[J]. Chinese Physics C, 1978, 2(2): 151-157.

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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 COMPLETE FUSION CROSS-SECTIONS FOR THE REACTIONS ¹²C+²⁷Al, ¹²C+²⁰⁹Bi AND ¹⁴N+Pb

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

Abstract: Mica track detectors were used for the measurement of evaporation residues and fission fragments of compound nuclei formed in ¹²C+²⁷Al, ¹²C+²⁰⁹Bi and ¹⁴N+Pb reactions. The complete fusion cross-sections and excitation functions were then obtained. By using the sharp cut-off model approximation, the values of the critical angular momenta were extracted from the complete fusion cross-sections. The results obtained were compared with the calculations based on current theories for critical angular momentum; they were found to agree within experimental uncertainties.