Results 21 to 30 of about 55,721 (192)

Tellurium coincidence Doppler broadening spectroscopy study

Results in Physics, 2019
The Coincidence Doppler broadening (CDB) reference curve for pure Tellurium (Te) has been obtained stablishing a point of departure for future Positron Annihilation Spectroscopy (PAS) studies of alloys that include Te among its components to determine ...
R. Domínguez-Reyes
doaj   +1 more source

Positron cooling and annihilation in noble gases [PDF]

, 2017
Understanding the dynamics of positron cooling in gases, including the fraction of positrons surviving to thermalisation, is critical for accurate interpretation of positron lifetime spectra, for the development of efficient positron cooling in traps and
Green, D. G.
core   +3 more sources

Positron-molecule interactions: resonant attachment, annihilation, and bound states [PDF]

, 2010
This article presents an overview of current understanding of the interaction of low-energy positrons with molecules with emphasis on resonances, positron attachment and annihilation.
Abdoul-Carime, H., Berestetskii, V. B., Bertie, J. E., Bohr, A., C. M. Surko, Charlton, M., Christophorou, L. G., Demkov, Y. N., Deutsch, M., Fraser, P. A., G. F. Gribakin, Greaves, R. G., Gribakin, G. F., Heyland, G. R., Hotop, H., Hulett, L. D., Iwata, K., J. A. Young, Klar, D., Landau, L. D., Lee, C., Lee, C., Massey, H. S. W., McClellan, A. L., Nishimura, T., Pomeranchuk, I., Schrader, D. M., Smith, P. M., Surko, C. M., Surko, C. M., Tachikawa, M., Wahl, R. L.   +31 more
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Testing entanglement of annihilation photons

Scientific Reports, 2023
We present a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest. Each annihilation photon has an energy that is five orders of magnitude higher than the energy of photons in optical ...
Alexander Ivashkin, Dzhonrid Abdurashitov, Alexander Baranov, Fedor Guber, Sergey Morozov, Sultan Musin, Alexander Strizhak, Igor Tkachev   +7 more
doaj   +1 more source

Many-body theory of gamma spectra from positron-atom annihilation [PDF]

, 2005
A many-body theory approach to the calculation of gamma spectra of positron annihilation on many-electron atoms is developed. We evaluate the first-order correlation correction to the annihilation vertex and perform numerical calculations for the noble ...
Amusia M Ya, Amusia M Ya, Arponen J, Berestetskii V B, Chang L, Chang L, Coleman P G, Coleman P G, Dunlop L J M, Dzuba V A, Dzuba V A, Fraser P A, G F Gribakin, Gribakin G F, Gribakin G F, Iwata K, L J M Dunlop, Landau L D, Ludlow J, McEachran R P, Mitroy J, Mitroy J, Murphy T J, Surko C M, Van Reeth P, Wright G L   +25 more
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Detection of phase separation of neutron-irradiated Fe–Cr binary alloys using positron annihilation spectroscopy

Nuclear Materials and Energy, 2018
Phase separation in Fe–Cr binary alloys irradiated with neutrons at 473 K and 573 K was investigated using positron annihilation spectroscopy. Using positron annihilation coincidence Doppler broadening (CDB) measurements, the phase separation progress ...
Y. Noshita, K. Sato, H. Yamashita, R. Kasada, Q. Xu, M. Hatakeyama, S. Sunada   +6 more
doaj   +1 more source

$\gamma$-ray spectra and enhancement factors for positron annihilation spectra with core-electrons [PDF]

, 2015
Many-body theory is developed to calculate the $\gamma$-spectra for positron annihilation with valence and core electrons in the noble gas atoms. A proper inclusion of correlation effects and core annihilation provides for an accurate description of the ...
Green, D. G., Gribakin, G. F.
core   +2 more sources

Supernovae and Positron Annihilation [PDF]

, 2001
Radioactive nuclei, especially those created in SN explosion, have long been suggested to be important contributors of galactic positrons. In this paper we describe the findings of three independent OSSE/SMM/TGRS studies of positron annihilation ...
Chan, Cheng, Dermer, Harris, Hatano, Howell, J.D Kurfess, Johnson, Jose, Kinzer, Kinzer, Leising, M.D Leising, Milne, Milne, Ore, P.A Milne, Purcell, R.L Kinzer, Share, Timmes, Woosley   +21 more
core   +3 more sources

Searching for annihilation radiation from SN 1006 with SPI on INTEGRAL [PDF]

, 2006
Historical Type Ia supernovae are a leading candidate for the source of positrons observed through their diffuse annihilation emission in the Galaxy.
E. Kalemci, Milne D. K., P. A. Milne, S. E. Boggs, S. P. Reynolds   +4 more
core   +2 more sources

Calculations of positron binding and annihilation in polyatomic molecules [PDF]

, 2018
A model-potential approach to calculating positron-molecule binding energies and annihilation rates is developed. Unlike existing ab initio calculations, which have mostly been applied to strongly polar molecules, the present methodology can be applied ...
Gribakin, G. F., Swann, A. R.
core   +2 more sources