Study on the Unfavored α-Decay Lifetimes around a Closed Shell

XU Chang; REN Zhong-Zhou

Chinese Physics C> 2004, Vol. 28> Issue(5) : 502-506

Study on the Unfavored α-Decay Lifetimes around a Closed Shell

XU Chang ,
REN Zhong-Zhou ^,

Department of Physics,Nanjing University,Nanjing 210008,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy-Ion Accelerator,Lanzhou 730000,China

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Abstract：
The α-cluster model is extended to study the unfavored α-decay lifetimes around a closed shell. The newly discovered α-decay of 209Bi [Marcillac et al., Nature (London) 422, 2003: 876] and a odd-A N=127 isotones are investigated by the α-cluster model. The experimental decay lifetimes can be reproduced satisfactorily. The application of the α-cluster model to research unfavored α-decays has been proved reliable. The theoretical calculations also reflect the measured α particle preformation factor near magic number (N=126). The α-cluster model is improved by introducing a Z-dependent preformation factor.

References

[1]

. Marcillac P D et al. Nature ( London) , 2003, 422: 8762. Buck B, Merchant A C, Perez S M. Atomic Data and Nuclear Data Ta..ble, 1993 54: 533. Hodgeson P E, Betak E. Phys. Reps. , 2001, 374: 14. REN Zhong-Zhou, XU Gong-Ou. Phys. Rev. , 1987, C36: 4565. REN Zhong-Zhou, XU Gong-Ou. Phys. Rev. , 1988, C38: 10786. REN Zhong-Zhou, XU Gong-Ou. J. Phys. , 1989, G15: 4657. REN Zhong-Zhou, XU Gong-Ou. High Energy Phys. and Nucl. Phys. ,1988, 12: 116(in Chinese)(任中洲,徐躬藕.高能物理与核物理.1988,12:116)8. REN Zhong-Zhou, XU Gong-Ou. High Energy Phys. and Nucl. Phys. ,1990, 14: 92(in Chinese)(任中洲,徐躬藕.高能物理与核物理.1990,14:92)9. Audi G, Bersillon O, Blachot J et al. Nucl. Phys. , 1997, A624: 1

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XU Chang and REN Zhong-Zhou. Study on the Unfavored α-Decay Lifetimes around a Closed Shell[J]. Chinese Physics C, 2004, 28(5): 502-506.

XU Chang and REN Zhong-Zhou. Study on the Unfavored α-Decay Lifetimes around a Closed Shell[J]. Chinese Physics C, 2004, 28(5): 502-506. shu

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Received: 2003-08-18
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the Unfavored α-Decay Lifetimes around a Closed Shell

XU Chang
REN Zhong-Zhou ^,

Corresponding author: REN Zhong-Zhou,

Department of Physics,Nanjing University,Nanjing 210008,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy-Ion Accelerator,Lanzhou 730000,China

Received Date: 2003-08-18
Accepted Date: 1900-01-01
Available Online: 2004-05-05

Abstract: The α-cluster model is extended to study the unfavored α-decay lifetimes around a closed shell. The newly discovered α-decay of 209Bi [Marcillac et al., Nature (London) 422, 2003: 876] and a odd-A N=127 isotones are investigated by the α-cluster model. The experimental decay lifetimes can be reproduced satisfactorily. The application of the α-cluster model to research unfavored α-decays has been proved reliable. The theoretical calculations also reflect the measured α particle preformation factor near magic number (N=126). The α-cluster model is improved by introducing a Z-dependent preformation factor.