• positron emission
  • 11 C → 11 B + e+ + ν e + 6987153808942752000♠0.96 MeV 11 C + e− → 11 B + Electron neutrino + 6987317230944426000♠1.98 MeV It is produced from nitrogen in a cyclotron by the reaction 14 N + p → 11 C + 4 He Carbon-11 is commonly used as a radioisotope for the radioactive labeling of molecules in positron emission tomography. (wikipedia.org)
  • beta-delayed
  • Although prompt (i.e. not beta-delayed) proton emission was observed from an isomer in cobalt-53 as early as 1969, no other proton-emitting states were found until 1981, when the proton radioactive ground states of lutetium-151 and thulium-147 were observed at experiments at the GSI in West Germany. (wikipedia.org)
  • nuclide
  • The valley of stability is formed by the negative of binding energy, the binding energy being the energy required to break apart the nuclide into its proton and neutron components. (wikipedia.org)
  • Each nuclide is represented at the intersection of its respective neutron and proton number by a small square box with the chemical symbol and the nucleon number A. By columnar subdivision of such a field, in addition to ground states also nuclear isomers can be shown. (wikipedia.org)
  • stable
  • The only stable atoms having an odd number of protons and an odd number of neutrons are hydrogen-2, lithium-6, boron-10, nitrogen-14 and (observationally) tantalum-180m. (wikipedia.org)
  • The least stable known germanium isotope is 60Ge with a half-life of 30 ms. While most of germanium's radioisotopes decay by beta decay, 61Ge and 64Ge decay by β+ delayed proton emission. (wikipedia.org)
  • reaction
  • In general the results were in agreement with the predicted properties of the assumed reaction mechanism at all incident and emission energies, which inspires confidence that the theoretical interpretation is likely to be correct. (sun.ac.za)
  • 2 He is an intermediate in the first step of the proton-proton chain reaction. (wikipedia.org)
  • About 0.65% of neutrons are released in a nuclear chain reaction in a delayed way due to the mechanism of neutron emission, and it is this fraction of neutrons that allows a nuclear reactor to be controlled on human reaction time-scales, without proceeding to a prompt critical state, and runaway melt down. (wikipedia.org)
  • currents
  • The different emission probabilities of distinct species of nucleon pairs are produced in our model only by meson-exchange currents, mainly by the Δ isobar current. (osti.gov)
  • When modulated by an electronic function generator, the cyclotron is capable of creating proton spills with fast rise times (18 μs) and high instantaneous currents (790 nA). (osti.gov)
  • Energy
  • At a fixed emission energy, near the maximum allowed value, the slope of the double differential cross section increased with an increase in incident energy, resulting in the dominance of forward peaked reactions at higher incident energies. (sun.ac.za)
  • Acoustic emissions generated by the proton energy deposition were measured to be on the order of mPa. (osti.gov)
  • Galindo-Uribarri and co-workers chose an isotope of neon with an energy structure that prevents it from emitting protons one at a time. (wikipedia.org)
  • spectrum
  • The gamma-ray spectrum generated in collisions of the accelerated protons with the ambient gas is also calculated and successfully fitted to the Fermi Observatory data. (aps.org)
  • The parent proton spectrum is best represented by a classical test particle power law $\propto E^{- 2}$, steepening to $E^{-3}$ at $E_{br}\approx7GeV$ due to deteriorated particle confinement. (aps.org)
  • The acoustic frequency spectrum peaked at 10 kHz, and the acoustic pressure amplitude increased monotonically with increasing proton current. (osti.gov)
  • beam
  • Methods: An electronic function generator modulated the IBA C230 isochronous cyclotron to create a pulsed proton beam. (osti.gov)
  • The acoustic emissions generated by the proton beam were measured in water using a hydrophone. (osti.gov)
  • The acoustic measurements were repeated with increasing proton current and increasing distance between detector and beam. (osti.gov)
  • The origin of the acoustic wave was identified as the proton beam based on the correlation between acoustic emission arrival time and distance between the hydrophone and proton beam. (osti.gov)
  • Conclusions: The authors report the first observation of acoustic emissions generated by a proton beam from a hospital-based clinical cyclotron. (osti.gov)
  • carbon
  • While I was browsing his blog it seemed to me that there was actually quite an interesting analogy between debt and carbon emissions . (wordpress.com)
  • I am not in the 'Climate Change' lobby, but as I explain below, I think the phenomenon of carbon emissions has some analogy with the growth of national debt. (wordpress.com)
  • However
  • However, high intensities can cause emission of visible light upon interaction with matter, such as in Cherenkov radiation and radioluminescence. (wikipedia.org)
  • less
  • The new experiment showed that the two protons were initially ejected together, correlated in a quasibound 1S configuration, before decaying into separate protons much less than a nanosecond later. (wikipedia.org)