Shape evolution and test of the critical-point symmetry X(5) in <SUP>176</SUP>Os

HAO Xin; ZHU Li-Hua; WU Xiao-Guang; LI Guang-Sheng; PAN Bo; WANG Lie-Lin; ZHENG Yun; WANG Lei; LI Xue-Qin; LIU Ying; DING Huai-Bo; LI Zhong-Yu

doi:10.1088/1674-1137/33/S1/048

Chinese Physics C> 2009, Vol. 33> Issue(S1) : 151-153 DOI: 10.1088/1674-1137/33/S1/048

Shape evolution and test of the critical-point symmetry X(5) in ¹⁷⁶Os

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The lifetimes of excited states in the yrast band of ¹⁷⁶Os have been measured up to I=20h level using the Doppler shift attenuation method. The high-spin states of ¹⁷⁶Os were populated via fusion evaporation reaction ¹⁵²Sm(²⁸Si, 4n)¹⁷⁶Os at a beam energy of 140 MeV. The results support an X(5) structure for ¹⁷⁶Os at low spin. This structure disappears at high spin and shows a symmetry rotor character. The shape change of ¹⁷⁶Os is similar to that of ¹⁷⁸Os.

References

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HAO Xin, ZHU Li-Hua, WU Xiao-Guang, LI Guang-Sheng, PAN Bo, WANG Lie-Lin, ZHENG Yun, WANG Lei, LI Xue-Qin, LIU Ying, DING Huai-Bo and LI Zhong-Yu. Shape evolution and test of the critical-point symmetry X(5) in ¹⁷⁶Os[J]. Chinese Physics C, 2009, 33(S1): 151-153. doi: 10.1088/1674-1137/33/S1/048

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Received: 2008-10-23
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Shape evolution and test of the critical-point symmetry X(5) in ¹⁷⁶Os

Corresponding author: HAO Xin,

Received Date: 2008-10-23
Accepted Date: 1900-01-01
Available Online: 2009-01-10

Abstract: The lifetimes of excited states in the yrast band of ¹⁷⁶Os have been measured up to I=20h level using the Doppler shift attenuation method. The high-spin states of ¹⁷⁶Os were populated via fusion evaporation reaction ¹⁵²Sm(²⁸Si, 4n)¹⁷⁶Os at a beam energy of 140 MeV. The results support an X(5) structure for ¹⁷⁶Os at low spin. This structure disappears at high spin and shows a symmetry rotor character. The shape change of ¹⁷⁶Os is similar to that of ¹⁷⁸Os.