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Chinese Physics C> 2002, Vol. 26> Issue(5) : 445-449 

Signature Inversion Phenomena in the Rotational Bands of Odd-Odd 176Ir

  •  Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 Japan Atomic Energy Research Institute,Tokai mura,Ibaraki 319-1195,Japan3 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan4 Chiba University,Inage ku,Chiba 263-8512,Japan5 Department of Physics,Kyushu University,Fukuoka 812-81,Japan6 China Institute of Atomic Energy,Beijing 102413,China

  • High spin states in 176Ir have been investigated via the 149Sm(31P,4nγ)176Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed,the πh9/2;νi13/2 and πi13/2;νi13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at Ic=18 which is consistent with expectations;this signature inversion spin in the πi13/2;νi13/2 band may be larger than 25h.
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    [1] . Bengtsson R et al. Nucl. Phys.,1984,A415:189 2. Garcfa Bermúdez,G Cardona M A .Phys.Rev.,2001,C64:034311 3. ZHANG Y H et al. Eur. Phys. Jou.,2000, A8:439 4. Bark R A et al. Phys. Lett.,1997,B406:193 5. Dracoulis G D et al. Nucl. Phys.,1991,A534:1736. Browne E, Huo J. Nucl. Data Sheets,1998,84:337 7. Bosch U et al. Z. Phys.,1990,A336:3598. ZHANG Y H et al. Chin. Phys. Lett.,2001,18:1323 9. ZHANG Y H et al.High Energy Phys. and Nucl. Phys.,2000,24(supp.):21(inChinese)(张玉虎等.高能物理与核物理,2000,24(增刊):21)10. Hojman D et al. Eur. Phys. J.,2001,A10:245 11. Furuno K et al. Nucl. Instrum. Methods Phys. Res.,1999,A421:211 12. Kreiner A J et al. Phys. Rev.,1987,C36:2309 13. Fabricius B et al. Nucl. Phys.,1990,A511:345 14. Cardona M A et al. Phys. Rev.,1999,C59:129815. Hojman D et al. Phys. Rev.,1992,C45:90

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ZHANG Yu-Hu, WEN Shu-Xian and ZHU Li-Hua. Signature Inversion Phenomena in the Rotational Bands of Odd-Odd 176Ir[J]. Chinese Physics C, 2002, 26(5): 445-449.
ZHANG Yu-Hu, WEN Shu-Xian and ZHU Li-Hua. Signature Inversion Phenomena in the Rotational Bands of Odd-Odd 176Ir[J]. Chinese Physics C, 2002, 26(5): 445-449. shu
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Received: 2001-12-12
Revised: 1900-01-01
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Signature Inversion Phenomena in the Rotational Bands of Odd-Odd 176Ir

    Corresponding author: ZHANG Yu-Hu,
  • Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 Japan Atomic Energy Research Institute,Tokai mura,Ibaraki 319-1195,Japan3 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan4 Chiba University,Inage ku,Chiba 263-8512,Japan5 Department of Physics,Kyushu University,Fukuoka 812-81,Japan6 China Institute of Atomic Energy,Beijing 102413,China
  • Received Date: 2001-12-12
  • Accepted Date: 1900-01-01
  • Available Online: 2002-05-05

Abstract: High spin states in 176Ir have been investigated via the 149Sm(31P,4nγ)176Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed,the πh9/2;νi13/2 and πi13/2;νi13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at Ic=18 which is consistent with expectations;this signature inversion spin in the πi13/2;νi13/2 band may be larger than 25h.

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