Signature Inversion in the πh9/2⊙νi13/2 Oblate Band of 190Tl

ZHOU Xiao-Hong; XIE Cheng-Ying; ZHANG Yu-Hu; GUO Ying-Xiang; LEI Xiang-Guo; ZHENG Yong; LIU Min-Liang; SONG Li-Tao; WANG Hua-Lei; YU Hai-Ping; LUO Peng; GUO Wen-Tao

Chinese Physics C> 2004, Vol. 28> Issue(10) : 1045-1049

Signature Inversion in the πh_9/2⊙νi_13/2 Oblate Band of ¹⁹⁰Tl

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy, Beijing 102413,China

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Abstract：
High spin states in ¹⁹⁰Tl have been studied experimentally using the ¹⁶⁰Gd(³⁵Cl,5n) fusion evaporation reaction at beam energies of 167—175 MeV. A rotational band built on the πh_9/2⊙νi_13/2 configuration with oblate deformation has been established. Spin values have been firmly assigned to the πh_9/2⊙νi_13/2 oblate band by combining the present in beam experimental results with the complementary α γ correlation measurements of ¹⁹⁴Bi α decay. With the configuration and spin parity assignments, the low spin signature inversion has been revealed for the πh_9/2⊙νi_13/2 oblate band. It is the first experimental observation of low spin signature inversion for a band associated with the oblate πh_9/2⊙νi_13/2 configuration. The low spin signature inversion could be interpreted in the framework of the quasiparticles plus rotor model including a J dependent proton neutron residual interaction.

References

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. Bohr A, Mottelson B R. Nuclear Structure ( II Nuclear Deformations), New York: Benjamin, 19752. Bengtsson R et al. Nucl. Phys., 1984, A415: 1893. Cardona M A et al. Phys. Rev., 1999, C59: 12984. Plettner C et al. Phys. Rev. Lett., 2000, 85: 24545. Kreiner A J et al. Phys. Rev., 1980, C21: 9336. Kreiner A J et al. Phys. Rev., 1979, C20: 22057. Kreiner A J et al. Nucl. Phys., 1978, A308: 1478. Kreiner A J et al. Nucl. Phys., 1977, A282: 2439. Kreiner A J et al. Phys. Rev., 1981, C23: 74810. Kreiner A J et al. Phys. Rev., 1980, C22: 257011. Van Duppen P et al. Nucl. Phys., 1981, A529: 26812. Huyse M et al. Phys. Lett., 1988, B201: 29313. Ellis-Akovali YA et al. Phys. Rev., 1981, C23: 48014. Kreiner A J et al. Phys. Rev. Lett., 1981, 47: 170915. Menges R et al. G. S. I. Scientific Report 8921, 1989, 3316. Hubel H et al. Nucl. Phys., 1986, A453: 31617. Porquet M G et al. Phys. Rev., 1991, C44: 244518. Reviol W et al. Phys. Scr., 1995, T56: 167

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ZHOU Xiao-Hong, XIE Cheng-Ying, ZHANG Yu-Hu, GUO Ying-Xiang, LEI Xiang-Guo, ZHENG Yong, LIU Min-Liang, SONG Li-Tao, WANG Hua-Lei, YU Hai-Ping, LUO Peng, GUO Wen-Tao, Signature Inversion in the πh_9/2⊙νi_13/2 Oblate Band of ¹⁹⁰Tl[J]. Chinese Physics C, 2004, 28(10): 1045-1049.

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Received: 2004-04-29
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

Signature Inversion in the πh_9/2⊙νi_13/2 Oblate Band of ¹⁹⁰Tl

Corresponding author: ZHOU Xiao-Hong,

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy, Beijing 102413,China

Received Date: 2004-04-29
Accepted Date: 1900-01-01
Available Online: 2004-10-05

Abstract: High spin states in ¹⁹⁰Tl have been studied experimentally using the ¹⁶⁰Gd(³⁵Cl,5n) fusion evaporation reaction at beam energies of 167—175 MeV. A rotational band built on the πh_9/2⊙νi_13/2 configuration with oblate deformation has been established. Spin values have been firmly assigned to the πh_9/2⊙νi_13/2 oblate band by combining the present in beam experimental results with the complementary α γ correlation measurements of ¹⁹⁴Bi α decay. With the configuration and spin parity assignments, the low spin signature inversion has been revealed for the πh_9/2⊙νi_13/2 oblate band. It is the first experimental observation of low spin signature inversion for a band associated with the oblate πh_9/2⊙νi_13/2 configuration. The low spin signature inversion could be interpreted in the framework of the quasiparticles plus rotor model including a J dependent proton neutron residual interaction.