Study of Fragment Angular Excitation Mechanism in Low Energy Fission

HAN Hong-Yin; XIA Hai-Hong; WANG Tao-Feng; MENG Qian-Hua; ZHU Li-Ping; WANG Li-Ming; HOU Long

Chinese Physics C> 2006, Vol. 30> Issue(S2) : 199-201

Study of Fragment Angular Excitation Mechanism in Low Energy Fission

China Institute of Atomic Energy, Beijing 102413, China2 Northwest Institute of Nuclear Technology, Xi'an 710024, China

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A four-parameter correlation measurement, including two semiconductors and a liquid scintillator as well as a 60% HPGe detector, was employed to measure the correlations of neutron multiplicity and γ yield with the fission parameters, such as fragment mass number A^* and total kinetic energy TKE of fragments. Because it is the first time that the absolute γ yield for the selected fragment is determined, so the angular momentum excitation of fragments can be investigated using the correlations of γ multiplicity with the neutron yield as well as with A^* and TKE. The results show that there is the complex correlation between the angular momentum excitation and the fragment deformation. The measured data can not be explained on the basis of the bending and wriggling excitation modes, but it could be understood partly by the assumption that there exists the positive correlation between the angular momentum excitation of fragments and the excitation energy of fission nuclei at the scission.

References

[1]

. Mikhailov N, Quentin P et al. Proceedings of the SecondInt. Conf. on Fission and Properties of Neuteon-Rich Nu-clei. Edited by J. H. Hamilton, W. R. Philips and H. K.Carter, Scotland, UK, June 28-July 3, 1999, 384-3922. Glāssel P, Schmid-Fabian R, Schwalm D. Nucl. Phys., 1972,A502: 315-324c3. Nifenecker H et al. Proceedings of the Third IAEA Sym-posium on the Phys. and Chem. of Fission, Held by IAEA,Rochester, New York, USA, 13-17, Aug. 1973, 2: 1174. HAN Hong-Yin, LI An-Li, CHEN Jin-Hua et al. BeijingInt. Symp. on Fast Neutron Physics, Edited by Sun Zuxunet al. Beijing, China, 9-13 Sep., 1991, 79-845. Knitter H H, Hambsch F J et al. Nucl. Phys., 1992, A536:221-2596. Krupa L, Kniajeva G N, Bogatchev A A et al. Proceed-ings of the Third Int. Conf. on Fission and Properties ofNeuteon-Rich Nuclei. Edited by J. H. Hamilton, A. V. Ra-mayya and H. K. Carter, Florida, USA, 3-9, Nov. 2002,207-2147. Wilhelmy J B, Cheifetz E et al. Phys. Rev., 1989, C5:2041-20608. Zieliinska-Pfabé M, Dietrich K. Phy. Lett., 1974, B49:123-128

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HAN Hong-Yin, XIA Hai-Hong, WANG Tao-Feng, MENG Qian-Hua, ZHU Li-Ping, WANG Li-Ming and HOU Long. Study of Fragment Angular Excitation Mechanism in Low Energy Fission[J]. Chinese Physics C, 2006, 30(S2): 199-201.

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Received: 2006-10-18
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

Study of Fragment Angular Excitation Mechanism in Low Energy Fission

Corresponding author: HAN Hong-Yin,

China Institute of Atomic Energy, Beijing 102413, China2 Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received Date: 2006-10-18
Accepted Date: 1900-01-01
Available Online: 2006-01-03

Abstract: A four-parameter correlation measurement, including two semiconductors and a liquid scintillator as well as a 60% HPGe detector, was employed to measure the correlations of neutron multiplicity and γ yield with the fission parameters, such as fragment mass number A^* and total kinetic energy TKE of fragments. Because it is the first time that the absolute γ yield for the selected fragment is determined, so the angular momentum excitation of fragments can be investigated using the correlations of γ multiplicity with the neutron yield as well as with A^* and TKE. The results show that there is the complex correlation between the angular momentum excitation and the fragment deformation. The measured data can not be explained on the basis of the bending and wriggling excitation modes, but it could be understood partly by the assumption that there exists the positive correlation between the angular momentum excitation of fragments and the excitation energy of fission nuclei at the scission.