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First decay study of the new isotope 129Pm near the proton drip line

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Abstract.

The very neutron-deficient nuclide 129Pm was produced via the 92Mo(40Ca, p2n) reaction and identified for the first time by using the X-\(\gamma \) coincidence in combination with a He jet tape transport system. According to the decay curve of a 99 keV \(\gamma \)-ray which corresponds to the known \(5/2^{-} \rightarrow 1/2^{-}\) transition in the daughter nucleus 129Nd of the 129Pm decay, the half-life of 129Pm was determined to be 2.4(9) s. Based on the nuclear potential energy surface (PES) calculations, the ground-state spin-parity of 129Pm was predicted as 5/2- which is favorable to feed a 5/2- low-lying state in the daughter nucleus 129Nd via the (EC \( + \beta^{ + }\)) decay.

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, PRC

    S.-W. Xu, Y.-X. Xie, Z.-K. Li & X.-D. Wang

  2. Department of Technical Physics and MOE Key Laboratory, Peking University, 10087, Beijing, PRC

    F.-R. Xu

Authors
  1. S.-W. Xu
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  2. Y.-X. Xie
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  3. F.-R. Xu
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  4. Z.-K. Li
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  5. X.-D. Wang
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Corresponding author

Correspondence to S.-W. Xu.

Additional information

Communicated by D. Schwalm

Received: 20 November 2003, Revised: 7 January 2004, Published online: 29 June 2004

PACS:

23.40.Hc Relation with nuclear matrix elements and nuclear structure - 21.10.Hw Spin, parity, and isobaric spin - 24.10.Pa Thermal and statistical models - 27.60. + j \(90 \leq A \leq 149\)

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Xu, SW., Xie, YX., Xu, FR. et al. First decay study of the new isotope 129Pm near the proton drip line. Eur. Phys. J. A 21, 75–77 (2004). https://doi.org/10.1140/epja/i2003-10190-3

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  • DOI: https://doi.org/10.1140/epja/i2003-10190-3

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