High-Spin Structure in Neutron-Rich <sup>108</sup>Ru Nucleus

Chin. Phys. Lett.

2004, Vol. 21

Issue (10): 1904-1907 DOI:

Original Articles

High-Spin Structure in Neutron-Rich ¹⁰⁸Ru Nucleus

CHE Xing-Lai¹;ZHU Sheng-Jiang¹;J. H. Hamilton²;A. V. Ramayya²;J. K. Hwang²;U Yong-Nam¹;LI Ming-Liang¹;ZHENG Rang-Chen¹;I. Y. Lee³;J. O. Rasmussen³;Y. X. Luo^2,3;W.C.Ma⁴

¹Department of Physics, Tsinghua University, Beijing 100084 ²Department of Physics, Vanderbilt University, Nashville, Tennessee 37235, USA ³Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA ³Department of Physics, Mississippi State University, Mississippi 39762, USA

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CHE Xing-Lai, ZHU Sheng-Jiang, J. H. Hamilton et al 2004 Chin. Phys. Lett. 21 1904-1907

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Abstract High spin states in the neutron-rich ¹⁰⁸Ru nucleus have been studied through measuring prompt γ-ray coincidences following the spontaneous fission of ²⁵²Cf with the Gammasphere detector array. The yrast band has been confirmed. The one-phonon γ-vibrational band and the two-quasiparticle band based on the 5^- level have been extended up to 13⁺ and 15^-, respectively. In addition, two levels at 1644.8keV and 1826.5keV excitation energies are newly identified and proposed to be the members of a two phonon γ-vibrational band. It is shown that the ¹⁰⁸Ru nucleus has triaxial deformation with parameters β₂～0.29 and γ=-22°from the total Routhian surface calculations. The observed band crossing in the yrast band is due to the alignment of a pair of h_11/2 neutrons according to the cranked shell model calculations. The possible configuration for the two-quasiparticle band has been discussed.

Keywords: 21.10.Re 21.60.Ev 27.60.+j

Published: 01 October 2004

PACS:	21.10.Re	(Collective levels)
	21.60.Ev	(Collective models)
	27.60.+j	(90 ≤ A ≤ 149)

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	CHE Xing-Lai
	ZHU Sheng-Jiang
	J. H. Hamilton
	A. V. Ramayya
	J. K. Hwang
	U Yong-Nam
	LI Ming-Liang
	ZHENG Rang-Chen
	I. Y. Lee
	J. O. Rasmussen
	Y. X. Luo
	W.C.Ma

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