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

Xu Shuwei<SUP>1</SUP>; Li Zhankul<SUP>1</SUP>; Xie Yuanxiang<SUP>1</SUP>; Pan Qiangyan<SUP>1</SUP>; Yu Yong<SUP>1</SUP>; J.Adam<SUP>2</SUP>; Wang Chunfang<SUP>1</SUP>; king Jianping<SUP>1</SUP>; Hu Qingyuan<SUP>1</SUP>; Li Shihong<SUP>1</SUP>; Chen Hongyan<SUP>1</SUP>; Zhang Tianmei<SUP>1</SUP>; Jin Genming&lt;sup

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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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.

References

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Xu Shuwei¹, Li Zhankul¹, Xie Yuanxiang¹, Pan Qiangyan¹, Yu Yong¹, J.Adam², Wang Chunfang¹, king Jianping¹, Hu Qingyuan¹, Li Shihong¹, Chen Hongyan¹, Zhang Tianmei¹ and Jin Genming<sup. Six New Nuclides Near the Proton-drip Line in the Rare-earth Region[J]. Chinese Physics C, 1999, 23(6): 589-593.

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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

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 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.