Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

FENG Zhao-Qing; JIN Gen-Ming; FU Fen; LI Jun-Qing

Chinese Physics C> 2007, Vol. 31> Issue(4) : 366-370

Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
The dinuclear system model has been further developed by introducing the barrier distribution function method in the process of heavy-ion capture and fusion to synthesize superheavy nuclei. The capture of two colliding nuclei, formation and de-excitation process of compound nucleus are decribed by using empirical coupled channel model, solving master equation numerically and statistical evaporation model, respectively. Within the framework of the di-nuclear system model, the fusion-evaporation excitation functions of the systems ⁴⁸Ca(²⁴³Am, 3n—5n)^288—286115 and ⁴⁸Ca(²⁴⁸Cm, 3n—5n)^293—291116 are calculated, which are used for synthesizing new superheavy nuclei at Dubna in recent years. Isotopic dependence of production cross sections with double magic nucleus ⁴⁸Ca bombarding actinide targets U,Np,Pu,Am,Cm to synthesize superheavy nuclei with charged numbers Z=112—116 is analyzed systematically. Based on these analysis, the optimal projectile-target combination and the optimal excitation energy are proposed. It is shown that shell correction energy and neutron separation energy will play an important role on the isotopic dependence of production cross sections of superheavy nuclei.

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[1]

. Hofmann S, Muzenberg G. Rev. Mod. Phys., 2000, 72: 7332. Hofmann S, He berger F P, Ackermann D et al. Eur. Phys.J., 2002, A14: 1473. Oganessian Yu Ts, Utyonkoy V K, Lobanov Yu V et al.Phys. Rev., 2004, C69: R0216014. Oganessian Yu Ts, Utyonkoy V K, Lobanov Yu V et al.Phys. Rev. Lett., 1999, 83: 31545. Oganessian Yu Ts, Yeremin A V, Popeko A G et al. Nature,1999, 400: 2426. Morita K, Morimoto K, Kaji D et al. J. Phys. Soc. Jpn,2004, 73: 25937. GAN Z G, FAN H M, QIN Z et al. HEP NP, 2004, 28(4):332. (in Chinese)(甘再国，范红梅,秦芝等.高能物理与核物理, 2004, 28(4)332)8. GAN Z G, GUO J S, WU X L et al. Eur. Phys. J., 2004,A20: 3859. Bjornholm S, Swiatecki W J. Nucl. Phys., 1982, A391: 47110. Aritomo Y, Wada T, Ohta M. Phys. Rev., 1999, C59: 79611. Antonenko N V, Cherepanov E A, Nasirov A K et al. Phys.Lett., 1993, B319: 42512. Adamian G G, Antonenko N V, ScheidWet al. Nucl. Phys.,1998, A633: 40913. Zagrebaev V I. Phys. Rev., 2001, C64: 03460614. FENG Z Q, JIN G M, FU F et al. Nucl. Phys., 2006, A771:5015. LI W, WANG N, LI J F et al. Europhys. Lett., 2003, 64:75016. Nasirov A, Fukushima A, Toyoshima Y et al. Nucl. Phys.,2005, A759: 34217. FENG Z Q, JIN G M, FU F et al. Chin. Phys. Lett., 2005,22(4): 84618. Oganessian Yu Ts, Utyonkoy V K, Lobanov Yu V et al.Phys. Rev., 2004, C70: 06460919. Adamian G G, Antonenko N V, Scheid W. Phys. Rev.,2004, C69: 01460720. Moller P, Nix J R, Myers W D et al. At. Data and Nucl.Data Tables, 1995, 59: 18521. Oganessian Yu Ts, Utyonkoy V K, Lobanov Yu V et al.Phys. Rev., 2001, C63: R011301

[1]	, , , , . Cross-section measurements for (n, 2n) reactions on stannum isotopes in the neutron energy range of 13.5 to 14.6 MeV. Chinese Physics C, 2008, 32(1): 28-30. doi: 10.1088/1674-1137/32/1/006
[2]	HAO Huan-Feng , XING Yong-Zhong , LIU Jian-Ye . Influence of Isospin\, Dependence\, of\, Nucleon-Nucleon\, Cross\, Section\, and\, Momentum\, DependentInteraction on the Isoscaling in Intermediate Energy Collisions. Chinese Physics C, 2007, 31(7): 651-654.
[3]	YE Wei . Possible Dependence of Dissipation Strength on Angular Momentum. Chinese Physics C, 2006, 30(8): 759-760.
[4]	PU Zhong-Sheng , GUAN Qiu-Yun , MA Jun , YAN Dong . Cross Section Measurements for (n,2n), (n,p) and (n,α) Reactions on Germanium Isotopes at the Neutron Energy around 14MeV. Chinese Physics C, 2006, 30(12): 1171-1174.
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[6]	LIU Zu-Hua , BAO Jing-Dong . Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus ²⁶⁶Hs. Chinese Physics C, 2006, 30(12): 1175-1179.
[7]	YE Wei . Dependence of Isospin Effects of Particle Evaporation on the Nuclear Shell Structure. Chinese Physics C, 2005, 29(3): 268-272.
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[10]	YE Wei . Dependence of Isospin Effect in the Multiplicity of Pre-Scission Particles on the Angular Momentum. Chinese Physics C, 2004, 28(6): 611-616.
[11]	ZHANG Wei , MENG Jie , ZHANG Shuang-Quan . Production Cross Section of Superheavy Nuclei in Cold Fusion Reactions Based on the Relativistic Mean Field Theory. Chinese Physics C, 2004, 28(1): 61-68.
[12]	PU Zhong-Sheng , KONG Xiang-Zhong , WEI Guo-Cong . Cross Section Measurements for(n,2n)Reactions on Neodymium Isotopes at the Neutron Energies of 13.5,14.1 and 14.6 MeV. Chinese Physics C, 2004, 28(9): 958-960.
[13]	ZUO Wei , LIU Jian-Ye , LI Jun-Qing . Properties of Isospin Asymmetric Nuclear Matter and Extended BHF Approach (Ⅵ)Proton and Neutron Mean Free Paths and Their Isospin Dependence. Chinese Physics C, 2003, 27(10): 888-891.
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[15]	XU Yan-Bing , YANG Wei-Fan , YUAN Shuang-Gui , XIAO Yong-Hou , PAN Qiang-Yan , LI Ying-Jun . Measurement of the Cross Sections for Ba Isotopes. Chinese Physics C, 2002, 26(6): 589-593.
[16]	FAN Hong-Mei , GAN Zai-Guo , QIN Zhi , LEI Xiang-Guo , XU Yan-Bing , HE Jian-Jun , LIU Hong-Ye , WU Xiao-Lei , GUO Jun-Sheng , ZHOU Xiao-Hong , YUAN Shuang-Gui , JIN Gen-Ming . A New Isotope of Z=105 with Mass Number 259. Chinese Physics C, 2001, 25(6): 602-606.
[17]	Guo Junsheng , Gan Zaiguo , Liu Hongye , Shi Lijun , Yang Weifan , Mou Wantong , Guo Tianrui , Fang Keming , Shen Shuifa , Yuan Shuanggui , Zhong Jiquan , Zhang Xueqian , Qin Zhi , Ma Ruichang , Wang Shuhong , Kong Dengming , Qiao Jimin . Synthesis and Identification of the New Transuranium Neutron-deficient Isotope ²³⁵Am. Chinese Physics C, 1996, 20(3): 286-288.
[18]	Yang Weifan , Yuan Shuanggui , Zhang Xueqian , Yu Xian , Mou Wantong , Li Zongwei , Gan Zaiguo , Liu Hongye , Guo Junsheng , Zhong Jiquan , Sun Xiangfu . The Synthesis and γ Decay of New Heavy Neutron-Rich Nuclide ¹⁷⁵Er. Chinese Physics C, 1995, 19(10): 959-960.
[19]	WEN Wan-Xin , GU Jin-Nan . Mixed Symmetry States in Gd Isotopes. Chinese Physics C, 1992, 16(4): 379-384.
[20]	ZHUANG Pen-Fei , LIU Lian-Shou . TARGET MASS DEPENDENCE AND NON-LINEAR EFFECTS IN HIGH ENERGY HEAVY ION COLLISIONS. Chinese Physics C, 1990, 14(3): 240-246.

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FENG Zhao-Qing, JIN Gen-Ming, FU Fen and LI Jun-Qing. Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions[J]. Chinese Physics C, 2007, 31(4): 366-370.

FENG Zhao-Qing, JIN Gen-Ming, FU Fen and LI Jun-Qing. Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions[J]. Chinese Physics C, 2007, 31(4): 366-370. shu

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Received: 2006-08-01
Revised: 2006-09-06

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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

Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

Corresponding author: FENG Zhao-Qing,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2006-08-01

Accepted Date: 2006-09-06

Available Online: 2007-04-05

Abstract: The dinuclear system model has been further developed by introducing the barrier distribution function method in the process of heavy-ion capture and fusion to synthesize superheavy nuclei. The capture of two colliding nuclei, formation and de-excitation process of compound nucleus are decribed by using empirical coupled channel model, solving master equation numerically and statistical evaporation model, respectively. Within the framework of the di-nuclear system model, the fusion-evaporation excitation functions of the systems ⁴⁸Ca(²⁴³Am, 3n—5n)^288—286115 and ⁴⁸Ca(²⁴⁸Cm, 3n—5n)^293—291116 are calculated, which are used for synthesizing new superheavy nuclei at Dubna in recent years. Isotopic dependence of production cross sections with double magic nucleus ⁴⁸Ca bombarding actinide targets U,Np,Pu,Am,Cm to synthesize superheavy nuclei with charged numbers Z=112—116 is analyzed systematically. Based on these analysis, the optimal projectile-target combination and the optimal excitation energy are proposed. It is shown that shell correction energy and neutron separation energy will play an important role on the isotopic dependence of production cross sections of superheavy nuclei.

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Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

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