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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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.

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

[1]	XU Fu-Rong . High-Spin Excitations of Atomic Nuclei. Chinese Physics C, 2004, 28(S1): 11-15.
[2]	YE Wei . Effect of Angular Momentum and Temperature on the Onset of Dissipation Fission. Chinese Physics C, 2001, 25(9): 884-888.
[3]	Zheng Jiwen , Wu Enjiu , Zhang Chun , Xiao Zhigang , Wang Sufang , Yin Shuzhi , Jin Genming , Tan Jilian , Jin Weiyang , Song Mingtao , Li Zuyu , Wu Heyu , He Zhiyong , Yin Xu , Peng Xinping , Jiang Dengxing , Qian Xing . Measurement of Fission Time Scale and Excitation Energy at Scission for 25MeV/u ⁴⁰Ar+²⁰⁹Bi Fission Reaction. Chinese Physics C, 1999, 23(10): 946-953.
[4]	Zheng Jiwen , Wu Enjiu , Xiao Zhigang , Zhang Chun , Yin Shuzhi , Wang Sufang , Jin Genming , Tan Jilian , Jin Weiyang , Song Mingtao , Li Zuyu , Wu Heyu , He Zhiyong , Yin Xu , Peng Xinping , Jiang Dongxing , Qian Xing . Investigation of Fission Properties in the Reaction 25MeV/u ⁴⁰Ar+²⁰⁹Bi. Chinese Physics C, 1999, 23(5): 409-416.
[5]	Zhang Zhanjun , Liu Yong , Sang Jianping . Microscopic Study of Low-Lying States of Even ^190─200Pt Isotopes. Chinese Physics C, 1998, 22(9): 836-843.
[6]	Zhang Zhanjun , Shi Zhuyi , Liu Yong , Sang Jianping . Microscopic Foundation of sdgIBM-2 and Study of Low-Lying States of ²⁴Mg. Chinese Physics C, 1998, 22(2): 169-175.
[7]	Bao Jingdong . Three-Dimensonal Langevin Approach to Kinetic Energy and Mass Distribution of Fission-Fragments. Chinese Physics C, 1998, 22(11): 1013-1019.
[8]	Fan Tieshuan , Hu Jimin , Bao Shanglian . Multichannel Fission Model Applied to ^223,235,238U (n,f). Chinese Physics C, 1996, 20(5): 422-429.
[9]	BAO Jing-Dong . The Hidden Symmetries and Their Algebraic Structure of the Static Axially Symmetric SDYM Fields. Chinese Physics C, 1993, 17(6): 544-548.
[10]	WANG Zheng-Da . A STUDY OF EXITATION ENERGIES SHARING BETWEEN FRAGMENTS IN HEAVY-ION REACTIONS. Chinese Physics C, 1990, 14(11): 1051-1056.
[11]	LIU Guo-Xing , ZHENG Ji-Wen , CHEN Ke-Liang , WANG Su-Fang , BAI Xing-Ping , YU Xian . MEASUREMENT OF FISSION-FRAGMENT ANGULAR DISTRIBUTIONS AND EXCITATION FUNCTIONS FOR THE ¹²C+²⁰⁹Bi AND ¹⁴N+Pb REACTIONS. Chinese Physics C, 1990, 14(9): 829-834.
[12]	LIU Guo-Xing , CHEN Ke-Liang , ZHENG Ji-Wen , WANG Su-Fang , BAI Xing-Ping , YU Xian , FAN Zhi-Guo . MEASUREMENT OF FISSION FRAGMENT ANGULAR DISTRIBUTION IN HEAVY-IONS INDUCED REACTION. Chinese Physics C, 1989, 13(8): 733-739.
[13]	LIU Guo-Xing , CHEN Ke-Liang , WANG Su-Fang , CAI Wei . ANGULAR DISTRIBUTIONS OF FISSION FRAGMENTS IN INTERACTIONS OF ¹²C IONS WITH VARIOUS TARGETS. Chinese Physics C, 1988, 12(3): 379-385.
[14]	CHEN Ke-Liang , LIU Guo-Xing , ZHENG Ji-Wen , WANG Su-Fang , FAN Zhi-Guo . MEASUREMENTS OF ANGULAR MOMENTUM EFFECT OF FISSION BARRIER. Chinese Physics C, 1988, 12(5): 658-664.
[15]	MIAO Rong-Zhi , WANG Zheng-Da . THE EFFECT OF DEFORMATION AT SCISSION POINT FOR THE CALCULATION OF EXCITATION ENERGY OF FRAGMENTS IN FUSION-FISSION AND QUASI-FISSION INDUCED BY HEAVY-IONS. Chinese Physics C, 1985, 9(6): 751-757.
[16]	LI Jun-Qing , ZHU Jie-Ding , WANG Zheng-Da , YANG Shi-Jun . ANGULAR MOMENTUM CORRELATION OF FRAGMENTS IN DEEP INELESTIC COLLISIONS. Chinese Physics C, 1985, 9(5): 603-610.
[17]	WANG Zheng-Da . A FURTHER EXPLORATION FOR MECHANISM OF ANGULAR MOMENTUM TRANSFER IN HEAVY ION REACTION. Chinese Physics C, 1984, 8(5): 596-601.
[18]	ZHANG Jing-Ye . A MICROSCOPIC ANALYSIS OF THE DIFFERENCE IN ANGULAR MOMENTUM BETWEEN EXCITED AND GROUND BANDS. Chinese Physics C, 1984, 8(3): 346-351.
[19]	Gu JIN-NAN . i(ω) AND EFFECTIVE ROTATION-ALIGNMENT ANGULAR MOMENTUM J. Chinese Physics C, 1981, 5(4): 513-517.
[20]	Zhang Jing-ye . ON THE ANGULAR MOMENTUM DIFFERENCE i(ω) BETWEEN SUPER-BAND AND GROUND-BAND. Chinese Physics C, 1980, 4(3): 382-385.

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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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通讯作者: 陈斌, bchen63@163.com

1.
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.

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Study of Fragment Angular Excitation Mechanism in Low Energy Fission

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