Observation of a Peak Structure in Positron Spectra from U+Cm Collisions

A narrow peak structure has been observed in positron spectra from U+Cm collisions at bombarding energies near the Coulomb barrier whose origin cannot be associated with established dynamic mechanisms of positron production involving Rutherford trajectories only. The peak's energy is centered a...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1983-12, Vol.51 (25), p.2261-2264
Hauptverfasser:	Schweppe, J., Gruppe, A., Bethge, K., Bokemeyer, H., Cowan, T., Folger, H., Greenberg, J. S., Grein, H., Ito, S., Schule, R., Schwalm, D., Stiebing, K. E., Trautmann, N., Vincent, P., Waldschmidt, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	652025 - Nuclear Properties & Reactions, A=220 & above, Experimental- Nuclear Reactions & Scattering- (-1987) ANTILEPTONS ANTIMATTER ANTIPARTICLES CHARGED-PARTICLE REACTIONS CURIUM 248 TARGET ELECTRODYNAMICS ELEMENTARY PARTICLES FERMIONS FIELD THEORIES HEAVY ION REACTIONS LEPTONS NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTION YIELD NUCLEAR REACTIONS POSITRONS QUANTUM ELECTRODYNAMICS QUANTUM FIELD THEORY TARGETS URANIUM 238 REACTIONS YIELDS
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Zusammenfassung:	A narrow peak structure has been observed in positron spectra from U+Cm collisions at bombarding energies near the Coulomb barrier whose origin cannot be associated with established dynamic mechanisms of positron production involving Rutherford trajectories only. The peak's energy is centered at 316 +- 10 keV. Its width of approx.80 keV, dominated by Doppler broadening, implies that the emitting system exists for longer than approx.10/sup -20/ sec.
ISSN:	0031-9007
DOI:	10.1103/PhysRevLett.51.2261