Emission of F23 and Ne24 in cluster radioactivity of Pa231

P. B. Price, R. Bonetti, A. Guglielmetti, C. Chiesa, R. Matheoud, C. Migliorino, K. J. Moody

Research output: Contribution to journalArticlepeer-review


Using a track-recording phosphate glass detector with a standard deviation Z=0.23 charge unit, we collected 2100 tracks of energetic clusters emitted from Pa231. Of these, 1348 survived cuts on energy, angle of incidence to the detectors, and 2. All but one of them are consistent with Ne24, and our measured branching ratio, B(Ne/)=(13.41.7)×10-12, for an alpha-decay half-life for Pa231 of 3.28×104 yr. This value of B is a factor of 2.2 greater than was determined by Tretyakova et al., who observed 252 Ne decays. We identify one event as F23, the nucleus predicted by cluster emission models to have the second highest branching ratio for emission from Pa231. This corresponds to a branching ratio B(Ne/F)=1347-940+6440, the 1 limits being governed by inverse Poisson statistics. Published models predict lower values of B(Ne/F), ranging from 3 to 400. Our event, if its 4 deviation from Ne is regarded as sufficient evidence for F, would be the first example of emission of an odd-Z cluster in spontaneous cluster radioactivity.

Original languageEnglish
Pages (from-to)1939-1945
Number of pages7
JournalPhysical Review C
Issue number5
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics


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