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                                 Abstract:Effective boson numbers in IBM-Ⅱ are tackled with a simple semi-empirical method,the saturation of proton boson numbers and neutron boson numbers is suggested.It explains the strong correlation and saturation effect of E2 and M1 transition strengrths in even-even rare-earth nuclei.Finally.the results here are compared with effective boson numbers calculated microscopically,the agreement is good.
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                        References
	
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								. Effects of Additional Vacancy-Like Defects Produced by Ion Impealations on Boron Thermal Diffusion in Silicon. Chinese Physics C,
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				| [3] | BES Collaboration
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								, Shi Yi-jin
								. A PRIMARY RESEARCH OF THE PHONON RENORMALIZATION OF NUCLEAR FIELD THEORY. Chinese Physics C,
							1980, 4(3): 398-400. |  
 
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