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Chinese Physics C> 2005, Vol. 29> Issue(11) : 1047-1051 

Collective Dand Structures in Doubly Odd 136La Nucleus

  •  Department of Physics, Tsinghua University, Beijing 100084, China2 China Institute of Atomic Energy, Beijing 102413, China

  • Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique,high spin states of 136La have been studied. The nuclear reaction used is 130Te(11B,5n) with a beam energy 60MeV. The level scheme with three collective band structures has been updated with spin up to 20h. The collective backbending has been observed in $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band. According to the TRS calculations，this backbending is due to the alignment of a pair of h11/2 neutrons. The signature splitting and inversion for the $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band were also discussed. Other two bands based on $12^-$ and $16^+$ levels were proposed as oblate deformation with $\gamma\approx -60^\circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$\uppi h_{11/2}\otimes\upnu g_{7/2} h_{11/2}^2$ and $\uppi g_{7/2}\otimes\upnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.
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    [1] . Paul E S, Beausang C W, Fossan D B et al. Phys. Rev.Lett., 1987, 58: 9842. Paul E S, Fossan D B, Liang Y et al. Phys. Rev., 1989,C40: 12553. ZHU Sheng-Jiang, GAN Cui-Yun, ZHU Ling-Yan et al.High Energy Phys. and Nucl. Phys., 2005, 29: 130(in Chinese)(朱胜江，廿翠云，朱凌燕等.高能物理与核物理，2005. 29:130)4. Bark R A, Baxter A M, Byrne A P et al. Nucl. Phys., 2001,A691: 5775. LUO Peng, ZHANG Yu-Hu, ZHOU Xiao-Hong et al. HighEnergy Phys. and Nucl. Phys., 2004, 28: 495(in Chinese)(骆鹏，张玉虎，周小红等.高能物理与核物理，2004, 28: 495)6. ZHU S J, ZHU L Y, LI M et al. Phys. Rev., 2000, C62:0443107. ZHU S J, LI M, ZHU L Y et al. Chin. Phys. Lett., 1999,16: 6358. Morek T, Beuscher H, Bochev B et al. Nucl. Phys., 1985,A433: 1599. Cybulska E W, Oliveira J R B, Rizzutto M A et al. ActaPhys. Polonica, 2001, B32: 92910. Radford D C. Nucl. Instrum. Methods, 1995, A361: 29711. Kumar V, Das P, Singh R P et al. Eur. Phys. J., 2003,A17: 15312. LIU Y, LU J B, MA Y J et al. Phys. Rev., 1996, C54: 71913. Bengtsson R et al. Nucl. Phys., 1972, A237: 13914. Frauendorf S et al. Phys. Lett., 1981, B100: 21915. Frauendorf S et al. Phys. Lett., 1983, B125: 21916. Hauschild K, Wadsworth R, Clark R M et al. Phys. Rev.,1996, C54: 613

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ZHU Sheng-Jiang, XIAO Shu-Dong, CHE Xing-Lai, YU Ying-Nan, LI Ming-Liang, CHEN Yong-Jing, ZHU Li-Hua, WEN Shu-Xian, WU Xiao-Guang and LI Guang-Sheng. Collective Dand Structures in Doubly Odd 136La Nucleus[J]. Chinese Physics C, 2005, 29(11): 1047-1051.
ZHU Sheng-Jiang, XIAO Shu-Dong, CHE Xing-Lai, YU Ying-Nan, LI Ming-Liang, CHEN Yong-Jing, ZHU Li-Hua, WEN Shu-Xian, WU Xiao-Guang and LI Guang-Sheng. Collective Dand Structures in Doubly Odd 136La Nucleus[J]. Chinese Physics C, 2005, 29(11): 1047-1051. shu
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Received: 2005-02-02
Revised: 1900-01-01
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Collective Dand Structures in Doubly Odd 136La Nucleus

    Corresponding author: ZHU Sheng-Jiang,
  • Department of Physics, Tsinghua University, Beijing 100084, China2 China Institute of Atomic Energy, Beijing 102413, China
  • Received Date: 2005-02-02
  • Accepted Date: 1900-01-01
  • Available Online: 2005-11-05

Abstract: Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique,high spin states of 136La have been studied. The nuclear reaction used is 130Te(11B,5n) with a beam energy 60MeV. The level scheme with three collective band structures has been updated with spin up to 20h. The collective backbending has been observed in $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band. According to the TRS calculations，this backbending is due to the alignment of a pair of h11/2 neutrons. The signature splitting and inversion for the $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band were also discussed. Other two bands based on $12^-$ and $16^+$ levels were proposed as oblate deformation with $\gamma\approx -60^\circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$\uppi h_{11/2}\otimes\upnu g_{7/2} h_{11/2}^2$ and $\uppi g_{7/2}\otimes\upnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.

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