Positron annihilation in low-temperature rare gases. I. Helium

Journal Article · Fri Aug 01 04:00:00 EDT 1975 · Phys. Rev., A, v. 12, no. 2, pp. 375-385

DOI:https://doi.org/10.1103/PhysRevA.12.375· OSTI ID:4134930

Canter, K F; McNutt, J D; Roellig, L O

The lifetime spectra of positrons annihilating in helium gas were obtained over the temperature range 4.6 to 300$sup 0$K and the density range 0.016 to 0.030 g/cm$sup 3$. The spectra are decomposed into slow- positron and ortho-positronium annihilation components which are presented and discussed separately. At low temperatures, the density and temperature dependences of the data are found to depart markedly from the usual behavior observed at room temperature. Simple quantitative treatments are given of the cluster model for the slow-positron data and of the cavity model for the ortho-positronium results. (auth)

• Research Organization: Wayne State Univ., Detroit
• NSA Number: NSA-33-008287
• OSTI ID: 4134930
• Journal Information: Phys. Rev., A, v. 12, no. 2, pp. 375-385, Journal Name: Phys. Rev., A, v. 12, no. 2, pp. 375-385; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*HELIUM-- POSITRON COLLISIONS
*POSITRON COLLISIONS-- ANNIHILATION
640303* --Physics Research--Atomic
Molecular & Chemical Physics--Positronium
Muonium & Muonic & Mesic Atoms & Molecules
GASES
LIFETIME
N60300* --Physics (Atomic & Molecular)--Positronium
Muonium
& Mesic Atoms & Molecules
SPECTRA