Experimental Study of High-Spin Band Structures in Odd-Odd <SUP>172</SUP>Re

ZHANG Yu-Hu; ZHOU Xiao-Hong

Chinese Physics C> 2003, Vol. 27> Issue(7) : 574-580

Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re

ZHANG Yu-Hu ^, ,
ZHOU Xiao-Hong

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000,China2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195,Japan3 Department of Physics, Kyushu University, Fukuoka, 812-81,Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023,Japan5 Chiba University, Inage-ku, Chiba 263-8512, Japan6 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-0006,Japan

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Abstract：
High-spin states in odd-odd ¹⁷²Re have been investigated via the ¹⁴⁹Sm(²⁷Al,4nγ)¹⁷²Re reaction through excitation functions, X-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first time,extending the high-spin studies of A≈170 odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the πh_11/2⊙νi_13/2,πh_9/2⊙νi_13/2 and π1/2^－[541]⊙ν1/2^－[521] configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band B(M1)/B(E2) ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to observation of signature crossing at high-spin states.

References

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ZHANG Yu-Hu and ZHOU Xiao-Hong. Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re[J]. Chinese Physics C, 2003, 27(7): 574-580.

ZHANG Yu-Hu and ZHOU Xiao-Hong. Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re[J]. Chinese Physics C, 2003, 27(7): 574-580. shu

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Received: 2002-09-29
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re

Corresponding author: ZHANG Yu-Hu,

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000,China2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195,Japan3 Department of Physics, Kyushu University, Fukuoka, 812-81,Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023,Japan5 Chiba University, Inage-ku, Chiba 263-8512, Japan6 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-0006,Japan

Received Date: 2002-09-29

Accepted Date: 1900-01-01

Available Online: 2003-07-05

Abstract: High-spin states in odd-odd ¹⁷²Re have been investigated via the ¹⁴⁹Sm(²⁷Al,4nγ)¹⁷²Re reaction through excitation functions, X-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first time,extending the high-spin studies of A≈170 odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the πh_11/2⊙νi_13/2,πh_9/2⊙νi_13/2 and π1/2^－[541]⊙ν1/2^－[521] configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band B(M1)/B(E2) ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to observation of signature crossing at high-spin states.

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Experimental Study of High-Spin Band Structures in Odd-Odd 172Re

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Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re

Experimental Study of High-Spin Band Structures in Odd-Odd ¹⁷²Re