Abstract
The exotic decay process of $\ensuremath{\beta}$-delayed fission ($\ensuremath{\beta}\mathrm{DF}$) has been studied in the neutron-deficient isotope $^{230}\mathrm{Am}$. The $^{230}\mathrm{Am}$ nuclei were produced in the complete fusion reaction $^{207}\mathrm{Pb}(^{27}\mathrm{Al},4n)^{230}\mathrm{Am}$ and separated by using the GARIS gas-filled recoil ion separator. A lower limit for the $\ensuremath{\beta}\mathrm{DF}$ probability ${P}_{\ensuremath{\beta}\text{DF}}(^{230}\mathrm{Am})g0.30$ was deduced, which so far is the highest value among all known $\ensuremath{\beta}\mathrm{DF}$ nuclei. The systematics of $\ensuremath{\beta}\mathrm{DF}$ in the region of $^{230}\mathrm{Am}$ will be discussed.
Highlights
The 230Am nuclei were produced in the complete fusion reaction 207Pb(27Al,4n)230Am and separated by using the GARIS gas-filled recoil ion separator
A caveat should be mentioned here that the plots of logarithmic PβDF values can show somewhat different, but still linear, trends if one uses different models to estimate
The α decays of the implanted recoil nuclei and their daughters are seen at EPSD < 9 MeV
Summary
Β-delayed fission was discovered in the neutron-deficient isotopes 232,234Am in Dubna in 1966 [3]. These nuclides were further studied in more detail in follow-up experiments in. The isotope 232Am was studied in three experiments, which reported three very different PβDF values, see Table I. Habs et al in Karlsruhe in 1978 [7] The reason for such a large difference between three measurements of PβDF(232Am) is as yet unknown. For the consistency of the discussion, all three values of PβDF(232Am) have been plotted, which shows the measured PβDF values as a function of the QEC(parent)−Bf (daughter) difference.
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