ZIB

Treffer pro Seite

Treffer 1 - 2 | 2 Treffer

Sortierung

Digitale Medien

Production and use of low-energy, monoenergetic positron beams from electron LINACS (1987)

Howell, R. H. ; Rosenberg, I. J. ; Fluss, M. J.

Springer

Applied physics 43 (1987), S. 247-255

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1432-0630

Schlagwort(e): 78.70BJ ; 07.77

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Low-energy intense positron beams derived from pair production can be made at high-energy electron linacs and such beams are in operation or under installation at several linac facilities. Using a pulsed position beam made at a 100 MeV electron linac, we have measured the intensity and velocity distribution of positronium emitted from materials by measuring the time-of-flight of annihilating positronium. The time-of-flight data are augmented by positron lifetime and angular correlation measurements performed with the beam. Positronium spectra have been measured for a number of metallic samples. Several new observations have been made including details of the energy distribution of positronium emission formed by a thermalized positron and a conduction electron and the production of positronium from energetic positrons scattered out of the sample.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00635179

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)

Howell, R. H. ; Sterne, P. A. ; Fluss, M. J. ; [weitere]

Springer

Journal of superconductivity 7 (1994), S. 169-173

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1572-9605

Schlagwort(e): La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00730389

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Treffer 1 - 2 | 2 Treffer