QEC Measurement of 124,125,127-130La

Yasuaki Kojima*, Masato Asai, Akihiko Osa, Mitsuo Koizumi, Toshiaki Sekine, Michihiro Shibata, Hiroshi Yamamoto, Kiyoshi Kawade, Takahiro Tachibana

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


For neutron-deficient 124,125,127-130La, QEC measurement has been performed by determining β+-ray maximum energies. The radioactive sources were prepared by on-line mass-separation following the fusion-evaporation reactions 92,natMo(36Ar, 3pxn). The β+-rays were measured with an HPGe detector in β - γ coincidence mode in which γ-rays were detected with another HPGe detector for specifying an excited state in daughter nucleus. By unfolding the β+-ray spectra using experimental response functions, the QEC-values of 124,125,127,130La were newly obtained, and those of 128,129La were improved in their accuracy. The QEC-values obtained and the resulting atomic masses are compared with theoretical predictions. The results of half-life calculation and two-neutron separation energies using the experimental QEC-values are also discussed.

Original languageEnglish
Pages (from-to)3405-3413
Number of pages9
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 1998 Oct


  • E = 5.4 MeV/u]
  • HPGe
  • La[from Mo(Ar, 3pxn)
  • La[from Mo(Ar, 3pxn)
  • Measured Q
  • Radioactivity
  • β - γ coincidence

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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