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Identification of a new heavy neutron-rich isotope238Th

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Abstract

A new heavy neutron-rich thorium isotope was produced via a multinucleon transfer reaction by irradiation of natural uranium targets with 60 MeV/u18O ions. The Th activities was radiochemically separated from the uranium and mixture of reaction products by the rapid solvent extraction method. Measurements of the gamma-ray spectra were performed with HPGe detectors. The new neutron-rich isotope238Th was identified for the first time based on the observation of the growth and decay of the gamma-ray with energy of 1060.5 keV from the decay of238Pa. The half-life of238Th has been determined to be 9.4±2.0 minutes. Further, a gamma-ray of 89.0 keV with the 8.9-minute half-life was found, which may be due to the decay of the new isotope238Th.

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Authors and Affiliations

  1. Institute of Modern Physics, The Chinese Academy of Sciences, 730000, Lanzhou, P.R. China

    Xiong Bing, Yang Weifan, Yuan Shuanggui, Ma Taotao, He Jianjun, Xu Yanbing & Li Zongwei

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  1. Xiong Bing
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  2. Yang Weifan
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  3. Yuan Shuanggui
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  4. Ma Taotao
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  5. He Jianjun
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  6. Xu Yanbing
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  7. Li Zongwei
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Bing, X., Weifan, Y., Shuanggui, Y. et al. Identification of a new heavy neutron-rich isotope238Th. J Radioanal Nucl Chem 242, 163–165 (1999). https://doi.org/10.1007/BF02345910

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  • DOI: https://doi.org/10.1007/BF02345910

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