Collective Band Structures of the Nuclei near N=82 Closed Shell in A=135 Region

  • Through heavy-ion nuclear reactions and in-beam γ-ray spectroscopy technique, the high spin states of odd A 137La and odd-odd 138Pr nuclei which are located near the N=82 closed shell on A=135 region, have been studied. The 130Te(11B,4n) and 128Te(14N,4n) reactions were used to populate the level states for 137La and 138Pr respectively. The level schemes of these two nuclei have been extended. In 137La, four collective bands have been newly identified. Among them, the near-yrast band is with weak prolate deformation, and another one belongs to a oblate band. In 138Pr,six collective bands have been observed. The yrast band is with weak prolate deformation also, and all the other five bands, two of which are newly identified by the present work, are assigned as the oblate bands. The characteristics for these collective bands, such as the signature inversion, the configuration origination etc. have been discussed.
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  • [1] . Paul E S et al. Phys. Rev. Lett., 1987, 58: 9842. Paul E S et al. Phys. Rev., 1989, C40: 12553. Bark R A et al. Nucl. Phys., 2001, A691: 5774. ZHU S J et al. Eur. Phys. J., 2005, A24: 1995. ZHU S J et al. Phys. Rev., 2000, C62: 0443106. ZHU S J et al. Chin. Phys. Lett., 1999, 16: 6357. LIU Y et al. Phys. Rev., 1996, C54: 718. Nakai K et al. Phys. Lett., 1973, B44: 4439. Kortelahti M et al. Nucl. Phys., 1982, A376: 110. Rizzutto M A et al. Z. Phys., 1992, A344: 22111. Gangopadhyay G et al. Eur. Phys. J., 2005, A24: 17312. Bengtsson R et al. Nucl. Phys., 1972, A237: 13913. Frauendorf S et al. Phys. Lett., 1981, B100: 21914. Frauendorf S et al. Phys. Lett., 1983, B125: 21915. Müller-Veggian M et al. Nucl. Phys., 1978, A304: 116. Ludziejewski J et al. Z. Phys., 1976, A277: 35717. Petrache C M et al. Nucl. Phys.,1988, A635: 36118. Petrache C M et al. Nucl. Phys., 1996, A597: 10619. Petrache C M et al. Nucl. Phys., 1996, A603: 5020. Kumar V et al. Eur. Phys. J., 2003, A17: 15321. Bark R A et al. Nucl. Phys., 2001, A691: 57722. LUO P et al. High Energy Phys. and Nucl. Phys., 2004,28: 495 (in Chinese)(骆鹏等. 高能物理与核物理, 2004, 28: 495)
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ZHU Sheng-Jiang, LI Ming-Liang, CHE Xing-Lai, XIAO Shu-Dong, CHEN Yong-Jing, YU Ying-Nan, DING Hui-Bo, XU Qiang, ZHU Li-Hua, WEN Shu-Xian, WU Xiao-Guang, LI Guang-Sheng and Collective Band Structures of the Nuclei near N=82 Closed Shell in A=135 Region[J]. Chinese Physics C, 2006, 30(S2): 141-145.
ZHU Sheng-Jiang, LI Ming-Liang, CHE Xing-Lai, XIAO Shu-Dong, CHEN Yong-Jing, YU Ying-Nan, DING Hui-Bo, XU Qiang, ZHU Li-Hua, WEN Shu-Xian, WU Xiao-Guang, LI Guang-Sheng and Collective Band Structures of the Nuclei near N=82 Closed Shell in A=135 Region[J]. Chinese Physics C, 2006, 30(S2): 141-145. shu
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Received: 2006-10-16
Revised: 1900-01-01
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Collective Band Structures of the Nuclei near N=82 Closed Shell in A=135 Region

    Corresponding author: ZHU Sheng-Jiang,
  • Department of Physics,Tsinghua University,Beijing 100084,China2 China Institute of Atomic Energy,Beijing 102413,China

Abstract: Through heavy-ion nuclear reactions and in-beam γ-ray spectroscopy technique, the high spin states of odd A 137La and odd-odd 138Pr nuclei which are located near the N=82 closed shell on A=135 region, have been studied. The 130Te(11B,4n) and 128Te(14N,4n) reactions were used to populate the level states for 137La and 138Pr respectively. The level schemes of these two nuclei have been extended. In 137La, four collective bands have been newly identified. Among them, the near-yrast band is with weak prolate deformation, and another one belongs to a oblate band. In 138Pr,six collective bands have been observed. The yrast band is with weak prolate deformation also, and all the other five bands, two of which are newly identified by the present work, are assigned as the oblate bands. The characteristics for these collective bands, such as the signature inversion, the configuration origination etc. have been discussed.

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