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- W2084114262 abstract "Californium isotopes of mass numbers 249, 250, 251, and 252 have been identified by mass spectrometric analyses of californium samples produced from neutron-irradiated plutonium. The half-lives of ${mathrm{Bk}}^{249}$, ${mathrm{Cf}}^{249}$, ${mathrm{Cf}}^{250}$, ${mathrm{Cf}}^{252}$, and ${mathrm{Cf}}^{253}$ are 290ifmmodepmelsetextpmfi{}20 days, 470ifmmodepmelsetextpmfi{}100 years, 10.0ifmmodepmelsetextpmfi{}2.4 years, 2.2ifmmodepmelsetextpmfi{}0.2 years, and 18ifmmodepmelsetextpmfi{}3 days, respectively. The alpha-particle energies of the most prominent alpha peaks for ${mathrm{Cf}}^{249}$, ${mathrm{Cf}}^{250}$, and ${mathrm{Cf}}^{252}$ are 5.81ifmmodepmelsetextpmfi{}0.03, 6.033ifmmodepmelsetextpmfi{}0.010, and 6.117ifmmodepmelsetextpmfi{}0.010 Mev, respectively. The plot of alpha-particle energies vs mass number for the isotopes of californium shows a break (i.e., the alpha energy of ${mathrm{Cf}}^{252}$ is larger than the alpha energy of ${mathrm{Cf}}^{250}$) indicating an irregularity in the nuclear energy surface. The alpha spectra of ${mathrm{Cf}}^{250}$ and ${mathrm{Cf}}^{252}$ exhibit characteristic even-even nuclide fine structure peaks. The beta-particle energy of ${mathrm{Bk}}^{249}$ is 80ifmmodepmelsetextpmfi{}20 kev. The spontaneous fission half-lives of ${mathrm{Cf}}^{250}$ and ${mathrm{Cf}}^{252}$ are 1.5ifmmodepmelsetextpmfi{}0.5ifmmodetimeselsetexttimesfi{}${10}^{4}$ and 66ifmmodepmelsetextpmfi{}10 years, respectively. Lower limits of 2ifmmodetimeselsetexttimesfi{}${10}^{8}$ and 5ifmmodetimeselsetexttimesfi{}${10}^{6}$ years have been placed on the partial spontaneous fission half-lives of ${mathrm{Bk}}^{249}$ and ${mathrm{Cf}}^{249}$. The pile (Materials Testing Reactor at Arco, Idaho) neutron capture cross sections of ${mathrm{Bk}}^{249}$, ${mathrm{Cf}}^{250}$, ${mathrm{Cf}}^{251}$, and ${mathrm{Cf}}^{252}$ are 350, 1500, 3000, and 25 barns, respectively." @default.
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- W2084114262 date "1954-12-15" @default.
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- W2084114262 title "Berkelium and Californium Isotopes Produced in Neutron Irradiation of Plutonium" @default.
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- W2084114262 doi "https://doi.org/10.1103/physrev.96.1576" @default.
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