Investigation of Nuclear Deformation in Excited <SUP>213</SUP>Fr

ZHANG Bao-Guo; WANG Su-Fang; DUAN Li-Min; WEN Wan-Xin; JIN Gen-Ming; LI Zu-Yu; HE Zhi-Yong; WANG Hong-Wei; XIAO Zhi-Gang; ZHENG Ji-Wen; WU He-Yu; WEI Zhi-Yong

Chinese Physics C> 2001, Vol. 25> Issue(7) : 636-642

Investigation of Nuclear Deformation in Excited ²¹³Fr

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China

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Abstract：
Angular correlations between γ rays and fission fragments were measured for the reaction ¹⁶O+¹⁹⁷Au at 132MeV. The probability of giant dipole resonance γ rays emission relative to the spin axis of the compound system was extracted by using the correlations,which give direct information about nuclear deformation. Large anisotropy observed in the γ rays energy region of the compound nucleus giant dipole resonance demonstrates unambiguously a deformed shape of the ²¹³Fr compound system at excitation energies of 92MeV. The fission coincidence γ ray spectra were fitted consistently in terms of the statistical γ ray decay of the compound system and excited fission fragments. The giant dipole resonance parameters obtained from the fits were then used to compute the γ ray angular distributions with respect to the compound nucleus spin axis for prolate and oblate shapes. The comparation between the calculation and the experimental results at excitation of 92MeV show that the ²¹³Fr nucleus is in the transition from a collective prolate to a noncollective oblate shape.

References

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ZHANG Bao-Guo, WANG Su-Fang, DUAN Li-Min, WEN Wan-Xin, JIN Gen-Ming, LI Zu-Yu, HE Zhi-Yong, WANG Hong-Wei, XIAO Zhi-Gang, ZHENG Ji-Wen, WU He-Yu and WEI Zhi-Yong. Investigation of Nuclear Deformation in Excited ²¹³Fr[J]. Chinese Physics C, 2001, 25(7): 636-642.

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Received: 2000-06-22
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

Investigation of Nuclear Deformation in Excited ²¹³Fr

Corresponding author: ZHANG Bao-Guo,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China

Received Date: 2000-06-22

Accepted Date: 1900-01-01

Available Online: 2001-07-05

Abstract: Angular correlations between γ rays and fission fragments were measured for the reaction ¹⁶O+¹⁹⁷Au at 132MeV. The probability of giant dipole resonance γ rays emission relative to the spin axis of the compound system was extracted by using the correlations,which give direct information about nuclear deformation. Large anisotropy observed in the γ rays energy region of the compound nucleus giant dipole resonance demonstrates unambiguously a deformed shape of the ²¹³Fr compound system at excitation energies of 92MeV. The fission coincidence γ ray spectra were fitted consistently in terms of the statistical γ ray decay of the compound system and excited fission fragments. The giant dipole resonance parameters obtained from the fits were then used to compute the γ ray angular distributions with respect to the compound nucleus spin axis for prolate and oblate shapes. The comparation between the calculation and the experimental results at excitation of 92MeV show that the ²¹³Fr nucleus is in the transition from a collective prolate to a noncollective oblate shape.

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Investigation of Nuclear Deformation in Excited ²¹³Fr

Investigation of Nuclear Deformation in Excited ²¹³Fr