Chinese Physics C > 1996, Vol. 20 > Issue(S2): 121-128

Study of High Spin Isomer and Its Decay Level Scheme of Doubly Odd¹⁴⁴Pm Nucleus

1 Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China;
2 RIKEN, Wako-shi, Saitama, 351-01, Japan;
3 Department of Physics, Tokyo Institute of Technology, Oh-okayama, Megurao, Tokyo 152, Japan;
4 Japan Atomic Energy Research Institute, Tokaii, Ibaraki 319-11, Japan;
5 Chiba University, Chiba-shi, Chiba 260, Japan;
6 Chiba Institute of Technology, Narashino-shi, Chiba 275, Japan;
7 Tsukuba University, Tsukuba-shi, Ibaraki 305, Japan;
8 Seoul National University, Seoul 151-742, Korea

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Abstract：
The high spin isomer (HSI) in ¹⁴⁴Pm was produced and separated by using the high spin isomer beam facility. Based on the measurements of γ- γcoincidence, γ-ray excitation functions, and isotropies, the decay level scheme of the HSI was established for the first time including 19 new high spin levels and 29 new γ-transitions assigned to ¹⁴⁴Pm by this work. The HSI- γcorrelation measurement indicated that the half-life of the HSI is longer than 2 μs. From the systematic comparisons and the deformed independent particle model calculations for the N=83 isotopes, the most possible particle configuration of π(1 h _11/2 ² d _5/2) υ(1 i _13/21 h _9/22 f _7/2) and the spin-parity of J ^*=27 ⁺were assigned to this HSI corresponding to an oblate deformation with β=-0.18.
- high spin isomer,
- nuclear structure,
- γ-spectroscopy,
- decay level scheme

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Zhang Yuhu, Y. Gono, A. Ferragut, K. Morita, C. B. Moon, A. Yoshida, T. Murakami, M. Nakajima, M. Ogawa, T. Morikawa, M. Oshima, H. Kusakari, M. Sugawara, K. Furono, T. Hayakawa, T. Komatsubara, J. Lu, S. J. Chae, J. C. Kim and B. J. Min. Study of High Spin Isomer and Its Decay Level Scheme of Doubly Odd ¹⁴⁴Pm Nucleus[J]. Chinese Physics C, 1996, 20(S2): 121-128.

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Received: 1995-05-05

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Supported by the Foundation of the Chinese Academy of Sciences.

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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

Study of High Spin Isomer and Its Decay Level Scheme of Doubly Odd¹⁴⁴Pm Nucleus

1 Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China;

2 RIKEN, Wako-shi, Saitama, 351-01, Japan;

3 Department of Physics, Tokyo Institute of Technology, Oh-okayama, Megurao, Tokyo 152, Japan;

4 Japan Atomic Energy Research Institute, Tokaii, Ibaraki 319-11, Japan;

5 Chiba University, Chiba-shi, Chiba 260, Japan;

6 Chiba Institute of Technology, Narashino-shi, Chiba 275, Japan;

7 Tsukuba University, Tsukuba-shi, Ibaraki 305, Japan;

8 Seoul National University, Seoul 151-742, Korea

Received Date:1995-05-05

Fund Project:Supported by the Foundation of the Chinese Academy of Sciences.

Abstract:The high spin isomer (HSI) in¹⁴⁴Pm was produced and separated by using the high spin isomer beam facility. Based on the measurements ofγ-γcoincidence,γ-ray excitation functions, and isotropies, the decay level scheme of the HSI was established for the first time including 19 new high spin levels and 29 newγ-transitions assigned to¹⁴⁴Pm by this work. The HSI-γcorrelation measurement indicated that the half-life of the HSI is longer than 2μs. From the systematic comparisons and the deformed independent particle model calculations for theN=83 isotopes, the most possible particle configuration ofπ(1h_11/2²d_5/2)υ(1i_13/21h_9/22f_7/2) and the spin-parity ofJ^*=27⁺were assigned to this HSI corresponding to an oblate deformation withβ=-0.18.

Study of High Spin Isomer and Its Decay Level Scheme of Doubly Odd¹⁴⁴Pm Nucleus

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通讯作者:陈斌, bchen63@163.com

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