Chinese Physics C > 1999, Vol. 23 > Issue(6): 589-593

Six New Nuclides Near the Proton-drip Line in the Rare-earth Region

Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 7300002 Flerov Laboratory of Nuclear Reactions, JINn Dubna, Russia

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Abstract：
Unknown isotopes ¹²⁵Nd, ¹²⁸Pm, ¹²⁹Sm, ¹³⁷Gd, ¹³⁹Dy and ¹³⁹Tb were produced using enriched targets ⁹²Mo, ⁹⁶Ru and ¹⁰⁶Cd, respectively, bombarded by ³⁶Ar ion beam with the energies of 165-180MeV from the SFC cyclotron of HIRFL. The six new nuclides were separated and identified by a He-jet combined with a fast-tape transport system as well as "p-γ" and "X-γ" coincidence measurements. Their half-lives were determined to be (0.60±0.15)s, (1.0±0.3)s, (0.55±0.10)s,(2.2±0.2)s, (0.6±0.2)s and (l.6±0.2)s, respectively. Energy spectra of β-delayed protons from ¹²⁵Nd, ¹²⁸Pm, ¹²⁹Sm, ¹³⁷Gd and ¹³⁹Dy decay were measured. Two γ-rays with the energies of 109.0 keV and 119.7 keV were assigned tO EC/β ⁺decay of ¹³⁹Tb.

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Xu Shuwei ¹, Li Zhankul ¹, Xie Yuanxiang ¹, Pan Qiangyan ¹, Yu Yong ¹, J.Adam ², Wang Chunfang ¹, king Jianping ¹, Hu Qingyuan ¹, Li Shihong ¹, Chen Hongyan ¹, Zhang Tianmei ¹and Jin GenmingXu Shuwei ¹, Li Zhankul ¹, Xie Yuanxiang ¹, Pan Qiangyan ¹, Yu Yong ¹, J.Adam ², Wang Chunfang ¹, king Jianping ¹, Hu Qingyuan ¹, Li Shihong ¹, Chen Hongyan ¹, Zhang Tianmei ¹and Jin Genming shu

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Received: 1999-03-12
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

Six New Nuclides Near the Proton-drip Line in the Rare-earth Region

1","");" href="javascript:void(0);">Xu Shuwei¹^,
1","");" href="javascript:void(0);">Li Zhankul¹
1","");" href="javascript:void(0);">Xie Yuanxiang¹
1","");" href="javascript:void(0);">Pan Qiangyan¹
1","");" href="javascript:void(0);">Yu Yong¹
2","");" href="javascript:void(0);">J.Adam²
1","");" href="javascript:void(0);">Wang Chunfang¹
1","");" href="javascript:void(0);">king Jianping¹
1","");" href="javascript:void(0);">Hu Qingyuan¹
1","");" href="javascript:void(0);">Li Shihong¹
1","");" href="javascript:void(0);">Chen Hongyan¹
1","");" href="javascript:void(0);">Zhang Tianmei¹
Jin Genming

Corresponding author:Xu Shuwei¹,

Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 7300002 Flerov Laboratory of Nuclear Reactions, JINn Dubna, Russia

Received Date:1999-03-12
Accepted Date:1900-01-01
Available Online:1999-06-05

Abstract:Unknown isotopes¹²⁵Nd,¹²⁸Pm,¹²⁹Sm,¹³⁷Gd,¹³⁹Dy and¹³⁹Tb were produced using enriched targets⁹²Mo,⁹⁶Ru and¹⁰⁶Cd, respectively, bombarded by³⁶Ar ion beam with the energies of 165-180MeV from the SFC cyclotron of HIRFL. The six new nuclides were separated and identified by a He-jet combined with a fast-tape transport system as well as "p-γ" and "X-γ" coincidence measurements. Their half-lives were determined to be (0.60±0.15)s, (1.0±0.3)s, (0.55±0.10)s,(2.2±0.2)s, (0.6±0.2)s and (l.6±0.2)s, respectively. Energy spectra of β-delayed protons from¹²⁵Nd,¹²⁸Pm,¹²⁹Sm,¹³⁷Gd and¹³⁹Dy decay were measured. Two γ-rays with the energies of 109.0 keV and 119.7 keV were assigned tO EC/β⁺decay of¹³⁹Tb.