Quantum mechanics

Nuclear fission

Algorithm

Cold fission

Nuclear reaction

Nuclear physics

Spontaneous fission

Energy (signal processing)

Atomic physics

Kinetic energy

Computer science

Classical mechanics

Neutron

Physics

Cluster decay

Neutron emission

Fragment (logic)

Fission

Programming language

Physical Review C

Pre-neutron-emission fragment-mass and total-kinetic-energy distributions and the mass-energy correlations in the spontaneous-fission decay of 2.30-sec $^{252}\mathrm{No}$ have been deduced from measured energies of coincident fragment pairs using silicon surface-barrier detectors. The $^{252}\mathrm{No}$ for these measurements was produced in the $^{241}\mathrm{Am}(^{15}\mathrm{N}, 4n)$ reaction and deposited on 40-\ensuremath{\mu}g ${\mathrm{cm}}^{\ensuremath{-}2}$ carbon foils using a He-jet technique. From an analysis of 154 correlated fission events, the average pre-neutron-emission total-kinetic energy, $〈\mathrm{TKE}〉$, was found to be 202.4\ifmmode\pm\else\textpm\fi{}1.2 MeV. The mass distribution is decidedly asymmetric, similar to that observed for $^{252}\mathrm{Cf}$ spontaneous fission, although a maximum in the $〈\mathrm{TKE}〉$ curve as a function of fragment mass occurs for near-symmetric mass divisions as it does for the heavier isotopes of fermium. The measured spontaneous-fission-decay branching fraction for $^{252}\mathrm{No}$ is 26.9\ifmmode\pm\else\textpm\fi{}1.9% and the measured total half-life is 2.30\ifmmode\pm\else\textpm\fi{}0.22 sec. The measured and deduced fission char\`acteristics for $^{252}\mathrm{No}$ are compared with those for the Cm, Cf, and Fm nuclides as well as with recent theoretical predictions.RADIOACTIVITY, FISSION $^{252}\mathrm{No}(\ensuremath{\alpha}, \mathrm{sf})$ measured fragment-fragment coin $E$, ${T}_{\frac{1}{2}}$, $E\ensuremath{\alpha}$, $\frac{\ensuremath{\alpha}}{\mathrm{sf}}$, $\ensuremath{\sigma}$ for $^{241}\mathrm{Am}(^{15}\mathrm{N}, 4n)$ reaction; deduced pre-neutron fragment masses, energies, and total kinetic $E$ distribution. Enriched target.

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Fragment-mass and kinetic-energy distributions from the spontaneous fission ofNo252