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Half-life of $$^{228}$$Pu and $$alpha$$-decay energy of $$^{228}$$Np

Nishio, Katsuhisa   ; Ikezoe, Hiroshi; Mitsuoka, Shinichi; Sato, Kenichiro; Lin, C. J.

We observed two $$alpha$$-decay chains starting from $$^{228}$$Pu in the reaction of $$^{34}$$S+$$^{198}$$Pt, and the half-life was measured to be 1.1$$^{+2.6}_{-0.5}$$ s for the first time. This contradicts the literature value of 4 ms as an upper limit, although the $$alpha$$-decay energy agrees with each other. The present half-life follows the Geiger-Nuttall curve for even-even Pu isotopes, showing the dominant $$alpha$$-decay branch. In this reaction, six $$alpha$$ decays of $$^{228}$$Np were firstly observed. The average $$alpha$$-particle energy was 7097$$pm$$61 keV. The evaporation residue cross sections of $$^{228}$$Pu, $$^{228}$$Np and $$^{225}$$U are reproduced by a statistical model calculation.

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Category:Physics, Nuclear

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