γ Degree of Freedom for the 178Hf Isomeric State

  • We have perfomed calculations for the six rotational bands in 178Hf which have been found experimentally by using triaxial projected shell model (TPSM). The γ band can be well reproduced with γ=22°. By using the same γ value, the present calculations predict a γ-band built on 178m2Hf(16+) state, and its band head (I=14+)lies about 900keV above the 178m2Hf(16+) state. This 14+ state should be rather easily excited from the 16+ isomeric state because of the same intrinsic configuration of these two states. It is hope that the 14+ state could have more probable chance to decay into the ground state band than that from the 178m2Hf(16+) state, and then to realize the de-excitation of the isomeric state.
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  • [1] . Apranamian A, Sun Y. Nature Phys., 2005, 1: 80-812. Walker P M, Carroll J J. Phys. Today, 2005, 58: 39-443. Walker P M, Dracoulis G D. Nature, 1999, 399: 35-404. Sherman M S. Science Technol. Rev., 2005, July/August:24-255. Ahmad I, Banar J C, Becker J A et al. Phys. Rev., 2005,C71: 0243116. Sheikh J A, Hara K. Phys. Rev. Lett., 1999, 82: 39687. GAO Z C, SUN Y, CHEN Y S. Phys. Lett., 2006, B634:1958. Jain, Sheline, Sood. Rev. Mod. Phys., 1990, 62: 4009. Hayes A B, Cline D, WU C Y et al. Phys. Rev. Lett., 2002,89: 24250110. Mullins S M, Dracoulis G D, Byrne A P et al. Phys. Lett.,1997, B400: 40111. Mullins S M, Dracoulis G D, Byrne A P et al. Phys. Lett.,1997, B393: 279-284
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TU Ya, CHEN Yong-Shou and GAO Zao-Chun. γ Degree of Freedom for the 178Hf Isomeric State[J]. Chinese Physics C, 2006, 30(S2): 109-111.
TU Ya, CHEN Yong-Shou and GAO Zao-Chun. γ Degree of Freedom for the 178Hf Isomeric State[J]. Chinese Physics C, 2006, 30(S2): 109-111. shu
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Received: 2006-10-16
Revised: 1900-01-01
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γ Degree of Freedom for the 178Hf Isomeric State

    Corresponding author: TU Ya,
  • China Institute of Atomic Energy, Beijing 102413, China2 Institute of Theoretical Nuclear Physics, Chinese Academy of Sciences, Beijing 100080, China

Abstract: We have perfomed calculations for the six rotational bands in 178Hf which have been found experimentally by using triaxial projected shell model (TPSM). The γ band can be well reproduced with γ=22°. By using the same γ value, the present calculations predict a γ-band built on 178m2Hf(16+) state, and its band head (I=14+)lies about 900keV above the 178m2Hf(16+) state. This 14+ state should be rather easily excited from the 16+ isomeric state because of the same intrinsic configuration of these two states. It is hope that the 14+ state could have more probable chance to decay into the ground state band than that from the 178m2Hf(16+) state, and then to realize the de-excitation of the isomeric state.

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