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稀土区原子核的形状变化和形状共存 华 辉 北京大学物理学院 2010年7月25-27日全国核结构会议 赤峰
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Shapes of atomic nuclei
一. 引言 Shapes of atomic nuclei Prolate Oblate Quadrupole deformation of the nuclear ground states M. Girod, CEA Bruyères-le-Châtel Few nuclei have oblate ground states (~86% are prolate in their ground state) Phys Rev C64 (2001)
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Shape evolution along with neutron number
protons neutrons 82 50 28 20 8 2 126 Deformed Spherical
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Evolution of nuclear shape
New analytical solutions, E(5) and X(5) R4/2= ~2.0 R4/2= 3.33
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X(5) Key Signatures E(41)/E(21) = 2.91 E(02)/E(21) = 5.67 E(5) X(5)
E(5) Key Signatures Deformed E(5) Sph. X(5) Key Signatures E(41)/E(21) = 2.91 E(02)/E(21) = 5.67 X(5) 1)F. Iachello, PRL85, 3580(2000); PRL87, (2001) 2)D.D. Warner, Nature 420 (2002) 614
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Transitional Rotor Vibrator
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Energy 148Sm 152Sm 154Sm Deformation Vibrator Soft Rotor Spherical
Transitional Deformed Energy Deformation
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Shape evolution along with angular momentum
65hbar! 1)Paul et al., PRL 98, (2007). 2)M.A. Riley et. al, ACTA PHYSICA POLONICA B40, 513(2009)
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Regan, et al., PRL 90, (2003)
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Triple Shape Coexistence at low excitation energy
186Pb 1)A. Andreyev et al., Nature 405 (2000) 430 2)T. Grahn,- PRL97 (2006)
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Triple Shape Coexistence at middle excitation energy
135Ba 1)Kumar et al., PRC81 (2010) ; 2)X.L. Che, S.J. Zhu et al., Eur. Phys. J. A 30, 347(2006)
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Shape Coexistence in the N=87 isotones
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稀土区原子核的形状
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实验方法 Inelastic scattering Transfer reactions Fusion
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实验 148Nd (9Be, 5n) 束流: 54MeV 9Be beam 靶: 148Nd target (1.1mg/cm2) 144Sm(16O, 束流: 102MeV 16O beam 靶: 144Sm target (1.2mg/cm2) 144Sm(16O, 束流: 85MeV 16O beam 靶: 144Sm target (3.1mg/cm2) 测量装置: 退激 -射线 Gamma array of CIAE
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C. Xu, H. Hua et al., Submitted
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ni13/2 nf7/2 nh9/2
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波函数成分的分析 I= 7/2- 26.9 keV I= 11/2- 350 keV I= 15/2- 1011 keV
20: : : f7/2 1/2[541] 21: : : 0.278 22: : : f7/2 3/2[532] 23: : : 0.287 24: : : 0.276 25: : :-0.155 26: :-0.079 27: :-0.079 I= 9/ keV I= 13/ keV I= 17/ keV 20: : : 0.284 21: : : h9/2 1/2[530] 22: : : 0.409 23: : : h9/2 3/2[521] 24: : : h9/2 5/2[523] 25: : : 0.149 26: : : 0.119 27: :-0.080
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Band Band 4
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三. 研究展望
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主 要 合 作 者 竺礼华,吴晓光,李广生,温书贤, 贺创业,崔兴柱,刘颖等 (中国原子能科学研究院核物理所) 王守宇 (山东大学威海分校)
周善贵 (中国科学院理论物理所)
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谢 谢 !!
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