Signature Partners in Superdeformed 149Tb

  • Five superdeformed bands observed in 149Tb were investigated comprehensively. A large-amplitude fluctuation in the observed transition energies and hence in the extracted dynamic moments of inertia was found in most of these bands. The smoothed transition energies were deduced by removing the fluctuation. The spins of these bands were assigned conclusively by the ab-fitting and/or its modification. Two pairs of superdeformed bands in 149Tb, i.e. bands 3,5 and bands 2,4,were proposed to be signature partners. The exit spins are 59/2 and 61/2 for the former pair,and 49/2 and 63/2 for the latter pair. These values are different by one unit from those given from a comparison with 150Tb(1). In fact,the spins of 150Tb(1), which have not been determined experimentally,are different by different theoretical approaches of assignment. The de-coupling constants were extracted from the modified ab-fitting. Responsible Ω=1/2 orbit in the vicinity of the Fermi surface of 149Tb seems to be ν[640]↑ for bands 2 and 4,and π[301]↓ for bands 3 and 5. The exit spin of band 1 was assigned as 53/2 or 55/2,which may be picked out from the observation of its signature partner. Good correspondence between these bands(especially bands 2,4 and 5) and their identical bands was obtained.
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  • [1] HAN X L,WU C L. At. Data Nucl. Data Tables, 1999,73:43-1502 Flibotte S,Andrews H R,Ball G C et al. Phys. Rev. Lett. ,1993,71:4299-43023 Becker J A,Henry E A,Kuhnert A et al. Phys. Rev. ,1992,C46 :889-9034 Draper J E,Stephens F S,Deleplanque M A et al. Phys. Rev. ,199O,C42:R1791-17955 XU F R,HU J M. Phys. Rev. ,1995,C52:431-4346 WU Chong-Shi. High Energy Phys. and Nucl. Phys. ,1998,22:48-53(in Chinese)(吴崇试. 高能物理与核物理,l998,22:48-53)7 WU Cbong-Shi. High Energy Phys. and Nucl. Phys. ,1998,22:71-77(in Chinese)(吴崇试. 高能物理与核物理,1998,22:71-77)8 WU Chong-Shi,Li Zhong-Hua. High Energy Phys. and Nucl. Phys. 1999,23:797-802(in Chinese)(吴崇试. 李中华. 高能物理与核物理,l999,23:797-802)9 WU Chong-Shi. J. Ningxia Univ. (Nat. Sci. edition). 1998,19:297-299(in Chinese)(吴崇试.宁夏大学学报(自然科学版),1998,19:297-299)10 LI Zhow-Hua, WU Chong-Shi. High Energy Phys. and Nucl. Phys. 2000,24 : 71-76( in Chinese)(李中华, 吴崇试. 高能物理与核物理,2000,24:71-76)11 WU Chow-Shi, LI Zhong-Hua. High Energy Phys. and Nucl. Phys. 2001,25(2) : 121-128(in Chinese)(吴崇试. 李中华. 高能物理与核物理, 2001, :121-128)12 Kharraja B,Garg U,Jin H et al. Phys. Rev. ,1998,C58: 1422-142913 WU Chong-Shi. High Energy Phys. and Nucl. Phys. ,2000,24: 66-70(in Chinese)(吴崇试. 高能物理与核物理,2000,24:66-70)14 WU Chow-Shi, LI Zhong-Hua. Commun. Theor. Phys. ,2000,33 : 397-404
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WU Chong-Shi. Signature Partners in Superdeformed 149Tb[J]. Chinese Physics C, 2001, 25(3): 205-211.
WU Chong-Shi. Signature Partners in Superdeformed 149Tb[J]. Chinese Physics C, 2001, 25(3): 205-211. shu
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Received: 2000-01-18
Revised: 1900-01-01
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Signature Partners in Superdeformed 149Tb

    Corresponding author: WU Chong-Shi,
  • Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000, ChinaDepartment of Physics,Peking University,Beijing 100871,China

Abstract: Five superdeformed bands observed in 149Tb were investigated comprehensively. A large-amplitude fluctuation in the observed transition energies and hence in the extracted dynamic moments of inertia was found in most of these bands. The smoothed transition energies were deduced by removing the fluctuation. The spins of these bands were assigned conclusively by the ab-fitting and/or its modification. Two pairs of superdeformed bands in 149Tb, i.e. bands 3,5 and bands 2,4,were proposed to be signature partners. The exit spins are 59/2 and 61/2 for the former pair,and 49/2 and 63/2 for the latter pair. These values are different by one unit from those given from a comparison with 150Tb(1). In fact,the spins of 150Tb(1), which have not been determined experimentally,are different by different theoretical approaches of assignment. The de-coupling constants were extracted from the modified ab-fitting. Responsible Ω=1/2 orbit in the vicinity of the Fermi surface of 149Tb seems to be ν[640]↑ for bands 2 and 4,and π[301]↓ for bands 3 and 5. The exit spin of band 1 was assigned as 53/2 or 55/2,which may be picked out from the observation of its signature partner. Good correspondence between these bands(especially bands 2,4 and 5) and their identical bands was obtained.

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