Academic literature on the topic 'The annihilation of positrons'

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Journal articles on the topic "The annihilation of positrons"

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Lingenfelter, Richard E., and Reuven Ramaty. "Annihilation Radiation and Gamma-Ray Continuum from the Galactic Center Region." Symposium - International Astronomical Union 136 (1989): 587–605. http://dx.doi.org/10.1017/s0074180900187091.

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Observations of the time-dependent, electron-positron annihilation line radiation and gamma-ray continuum emission from the region of the Galactic Center show that there are two components to the annihilation line emission: a variable, compact source at or near the Galactic Center, and a steady, diffuse interstellar distribution. We suggest that the annihilating positrons in the compact source, observed from 1977 through 1979, result from photon-photon pair production, most likely around an accreting black hole, and that the annihilating, interstellar positrons result from the decay of radionu
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Lynn, K. G., Bent Nielsen, and D. O. Welch. "Hydrogen interaction with oxidized Si(111) probed with positrons." Canadian Journal of Physics 67, no. 8 (1989): 818–20. http://dx.doi.org/10.1139/p89-141.

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A variable-energy positron beam was utilized to study the interface action of hydrogen with Si(111) covered by an ultrahigh-vacuum thermally grown oxide of 2–3 nm thickness. It was observed that positrons implanted at shallow depth (<100 nm) after diffusion are trapped either at the interface between the oxide and the Si or in the oxide. The positron-annihilation characteristics of these trapped positrons are found to be very sensitive to hydrogen exposure. The momentum distribution of the annihilating positron–electron pair, as observed in the Doppler broadening of the annihilation line, b
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Liu, Meng, Jakub Čížek, Cynthia S. T. Chang, and John Banhart. "A Positron Study of Early Clustering in Al-Mg-Si Alloys." Materials Science Forum 794-796 (June 2014): 33–38. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.33.

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Early stages of clustering in quenched Al-Mg-Si alloys during natural ageing were studied by positron annihilation lifetime spectroscopy utilizing its unique sensitivity to electron density differences in various atomic defects. Two different positron trapping sites could be identified, one related to a vacancy-type defect, the other to solute clusters. The first trap is deep, i.e. irreversibly traps positrons, the second shallow, from which positrons can escape, which creates the signature of a temperature-dependent positron lifetime. During the first 80 min of NA, the vacancy-related contrib
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Panther, Fiona H., Roland M. Crocker, Ivo R. Seitenzahl, and Ashley J. Ruiter. "SN1991bg-like supernovae are a compelling source of most Galactic antimatter." Proceedings of the International Astronomical Union 11, S322 (2016): 176–79. http://dx.doi.org/10.1017/s1743921316011911.

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AbstractThe Milky Way Galaxy glows with the soft gamma ray emission resulting from the annihilation of ~5 × 1043 electron-positron pairs every second. The origin of this vast quantity of antimatter and the peculiar morphology of the 511keV gamma ray line resulting from this annihilation have been the subject of debate for almost half a century. Most obvious positron sources are associated with star forming regions and cannot explain the rate of positron annihilation in the Galactic bulge, which last saw star formation some 10 Gyr ago, or else violate stringent constraints on the positron injec
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Xu, Hong Xia, Jun Lin, Yu Chen, et al. "Effect of FLiBe Infiltration Pressure on Microstructure of Matrix for TMSR Fuel Elements (FEs)." Defect and Diffusion Forum 373 (March 2017): 189–92. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.189.

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The matrix graphite of fuel elements (FEs) with infiltration of 2LiF-BeF2(FLiBe) at different pressures varying from 0.4 MPa to 1.0 MPa, has been studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and positron annihilation lifetime (PAL) measurement. The result of XRD reveals that diffraction patterns of FLiBe appear in matrix graphite infiltrated with FLiBe at a pressure of 0.8 MPa and 1.0 MPa. The surface morphology from SEM shows that FLiBe mainly distributes within macro-pores of matrix graphite. PAL measurement indicates that there are mainly two positron lifetime comp
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Wagner, Andreas, Wolfgang Anwand, Maik Butterling, et al. "Annihilation Lifetime Spectroscopy Using Positrons from Bremsstrahlung Production." Defect and Diffusion Forum 331 (September 2012): 41–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.331.41.

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A new type of a positron annihilation lifetime spectroscopy (PALS) system has been set up at the superconducting electron accelerator ELBE [ at Helmholtz-Zentrum Dresden-Rossendorf. In contrast to existing source-based PALS systems, the approach described here makes use of an intense photon beam from electron bremsstrahlung which converts through pair production into positrons inside the sample under study. The article focusses on the production of intense bremsstrahlung using a superconducting electron linear accelerator, the production of positrons inside the sample under study, the efficien
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Seeger, Alfred, Andreas Siegle, and Hermann Stoll. "Positron Annihilation in Stable and Supercooled Metallic Melts." International Journal of Materials Research 92, no. 7 (2001): 632–44. http://dx.doi.org/10.1515/ijmr-2001-0124.

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Abstract The stable and supercooled melts as well as the crystalline phases of Ga, In, Sn, Pb, and Bi have been investigated in the age –momentum correlation (AMOC) positron annihilation facility at the Stuttgart pelletron. The comparison of the lineshape parameter S, characterizing the momentum distribution of the annihilating electron –positron pairs, and of the mean positron lifetime with measurements of the positron diffusivity confirms in considerable detail the ‘polaron’ model of positrons in metallic melts developed earlier. The quantitative analysis of the data provides us with valuabl
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Setthahirun, Suwitchaya, and Maneenate Wechakama. "Constraining the annihilation of dark matter via cosmic-ray positrons and electrons." Journal of Physics: Conference Series 2145, no. 1 (2021): 012007. http://dx.doi.org/10.1088/1742-6596/2145/1/012007.

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Abstract We aim to constrain the properties of dark matter particles by several measurements of positrons and electrons from cosmic-rays. We assume that collisions of dark matter particles and dark matter anti-particles can produce positrons and electrons. The electron-positron propagation is explained by a diffusion-loss equation including loss rates, diffusion, as well as source function. We use data of cosmic-ray positrons and electrons detected by PAMELA, H.E.S.S., AMS-02 and Fermi-LAT. We compare the observational data with the electron and positron spectrum from five annihilation channel
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Doikov, Dmytry N., Alexander V. Yushchenko, and Yeuncheol Jeong. "Positron Annihilation Spectroscopy of Active Galactic Nuclei." Journal of Astronomy and Space Sciences 36, no. 1 (2019): 21–33. http://dx.doi.org/10.5140/jass.2019.36.1.21.

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This paper focuses on the interpretation of radiation fluxes from active galactic nuclei. The advantage of positron annihilation spectroscopy over other methods of spectral diagnostics of active galactic nuclei (therefore AGN) is demonstrated. A relationship between regular and random components in both bolometric and spectral composition of fluxes of quanta and particles generated in AGN is found. We consider their diffuse component separately and also detect radiative feedback after the passage of high-velocity cosmic rays and hard quanta through gas-and-dust aggregates surrounding massive b
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Čížek, Jakub, M. Vlček, F. Lukáč, et al. "Low Background Digital Coincidence Spectrometer – A Tool for Investigation of Positron Annihilation in Flight." Defect and Diffusion Forum 331 (September 2012): 53–73. http://dx.doi.org/10.4028/www.scientific.net/ddf.331.53.

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A digital spectrometer for low background gamma ray spectroscopy equipped with two high purity Ge detectors and a 12-bit two channel digitizer was employed for the investigation of positron annihilation-in-flight. Measurements were performed for positrons emitted by 68Ge/68Ga and 22Na radioisotopes and annihilated in Cu and Mg targets. The contribution of the two-quantum positron annihilation-in-flight was clearly resolved in coincidence two-dimensional gamma ray energy spectra. The contribution of positrons annihilated in flight has a hyperbolic shape described well by the relativistic theory
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Dissertations / Theses on the topic "The annihilation of positrons"

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Moscoso, Michael Douglas. "Electron-positron pair winds /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Shan, Yueyue. "A study of GaAs and CdZnTe by positron annihilation spectroscopy /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19324248.

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Shan, Yueyue, and 沈躍躍. "A study of GaAs and CdZnTe by positron annihilation spectroscopy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237630.

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Shan, Yueyue. "Study of GaAs as a possible field assisted positron moderator /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13692641.

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沈躍躍 and Yueyue Shan. "Study of GaAs as a possible field assisted positron moderator." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211847.

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Gillard, William. "Modélisation de l'émission d'annihilation des positrons Galactiques." Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00276275.

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Des positrons s'annihilent dans les régions centrales de notre Galaxie. Ce fait est établi depuis la détection d'une forte émission de la raie à 511 keV en direction du centre Galactique. Cette raie gamma est émise lors de l'annihilation de positrons avec des électrons. Grâce à SPI, le spectro-imageur de l'observatoire spatial INTEGRAL, nous pouvons maintenant caractériser précisément cette raie d'émission. <br />Cette thèse présente une étude de l'émission d'annihilation des positrons basée sur la modélisation des interactions entre les positrons et les différentes composantes du milieu inter
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Lonjou, Vincent. "L'annihilation des positrons galactiques : analyse et interprétation des données INTEGRAL." Phd thesis, Université Paul Sabatier - Toulouse III, 2005. http://tel.archives-ouvertes.fr/tel-00011121.

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L'origine des positrons galactiques reste un des sujets les plus controversés de l'Astrophysique des hautes énergies depuis la découverte de la raie d'annihilation électron-positron en provenance du centre galactique à la fin des années 1970. L'étude de la raie d'annihilation à 511 keV est actuellement un des objectifs majeurs de SPI : le spectromètre d'INTEGRAL.<br />Cette thèse s'ouvre sur l'étude de la partie centrale de SPI: son plan de détection. La procédure de calibration en énergie ainsi que l'étude de la dégradation des détecteurs sont reportées. Par la suite, une étude approfondie du
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Zhang, Yu, and 張毓. "Investigation of the lifetime spectrum of monoenergetic positrons in silicon involving secondary electrons emission from a carbon foil as start signal, and positron annihilation spectroscopy studies of strontium titante." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/197507.

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A proposed design of the variable energy positron annihilation spectroscopy (VEPALS) system based on secondary electron (SE) emission from a thin carbon foil has been investigated practically. The SE yield and the positron transmission coefficient were investigated as a function of the positron beam energy, the annular electrode potentials, and the column lengths of the annular electrode. The positron lifetime spectra of single crystal p-type silicon(Si) sample under different annular electrode potentials were analyzed. The result gives a supposed annular electrode potential of 1.5 kV. In view
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Santana, Andre Luis Dias. "Moléculas positrônicas: densidade eletrônica e taxas de aniquilação." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21062017-160648/.

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Este trabalho apresenta um estudo sobre taxas de aniquilação de pósitrons em gases moleculares por meio do cálculo do parâmetro de aniquilação Zeff. O modelo Gribakin-Lee (GL) formula de maneira fenomenológica um mecanismo de captura do pósitron mediado por uma interação dipolar, descrevendo uma contribuição ressonante para Zeff dos modos vibracionais ativos-IR da molécula. Este modelo concorda muito bem quando testado aos halometanos no experimento com feixes de pósitrons, porém, falha quando aplicado ao experimento com pósitrons térmicos. Neste contexto, foram testadas algumas hipóteses para
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Lineros, Rodriguez Roberto Alfredo. "Study of positrons from cosmic rays interactions and cold dark matter annihilations in the galactic environment." Chambéry, 2008. http://www.theses.fr/2008CHAMS059.

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Rayons cosmiques de positons et les électrons de fournir un moyen complémentaire à l'étude de l'environnement galactique. Les expériences de rayons cosmiques, par exemple PAMELA et HEAT, ont présenté des résultats très intéressant dans ce domaine. La fraction de positrons observé semble plus importante que la réalité les prédictions théoriques des énergies de plus de 10 GeV. Les preuves indirectes de la matière sombre dans le cadre de théories au-delà du modèle standard suggère l'existence d'une contribution supplémentaire présent dans le signal de rayons cosmiques. Nous étudions et le calcul
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Books on the topic "The annihilation of positrons"

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Attila, Vértes. Pozitronkémia: Akadémiai székfoglaló, 1994. március 22. Akadémiai Kiadó, 1994.

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International Workshop on Positron and Positronium Chemistry. (3rd 1990 Milwaukee, Wis.). Third International Workshop on Positron and Positronium Chemistry: July 16-18, 1990, Milwaukee, USA. Edited by Jean Y. C. World Scientific, 1990.

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Jean, Y. C. Positrons and positronium: A bibliography, 1930-1984. Elsevier, 1988.

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C, Jean Y., Mallon P. E, and Schrader D. M, eds. Principles and applications of positron & positronium chemistry. World Scientific, 2003.

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Workshop on Intense Positron Beams (1987 Idaho National Engineering Laboratory). 1987 Workshop on Intense Positron Beams: INEL, Idaho, USA, 18-19 June 1987. Edited by Kells W and Ottewitte E. H. World Scientific, 1988.

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International School of Physics "Enrico Fermi" (1993 Varenna, Italy). Positron spectroscopy of solids. IOS Press, 1995.

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B, Foster, ed. Electron-positron annihilation physics. A. Hilger, 1990.

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Mogensen, Ole Erik. Positron Annihilation in Chemistry. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-85123-0.

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Krause-Rehberg, Reinhard, and Hartmut S. Leipner. Positron Annihilation in Semiconductors. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03893-2.

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Mogensen, Ole Erik. Positron annihilation in chemistry. Springer-Verlag, 1995.

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Book chapters on the topic "The annihilation of positrons"

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Sazonov, S., E. Churazov, R. Sunyaev, and M. Revnivtsev. "Annihilation of positrons in the Galaxy." In Focusing Telescopes in Nuclear Astrophysics. Springer Netherlands, 2006. http://dx.doi.org/10.1007/978-1-4020-5304-7_2.

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Drukarev, Evgeny G., and Aleksandr I. Mikhailov. "Annihilation of Positrons with Atomic Electrons." In High-Energy Atomic Physics. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32736-5_11.

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Coleman, P. G., S. Rayner, R. N. West, M. Charlton, and F. Jacobsen. "Angular Correlation Studies of Positron and Positronium Annihilation in Gases." In Atomic Physics with Positrons. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0963-5_36.

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Chiari, Luca, and Masanori Fujinami. "Positron Annihilation." In Handbook of Advanced Non-Destructive Evaluation. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30050-4_19-1.

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Chiari, Luca, and Masanori Fujinami. "Positron Annihilation." In Handbook of Advanced Nondestructive Evaluation. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_19.

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Triftshäuser, W. "Positron Annihilation." In Topics in Current Physics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-46571-0_9.

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Davies, S. A., M. Charlton, and T. C. Griffith. "The Effect of an Electric Field on Free Positron Annihilation in Atomic and Molecular Gases." In Atomic Physics with Positrons. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0963-5_38.

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Armour, Edward A. G. "Calculations of Scattering Cross Sections and Annihilation Rates in Low Energy Collisions of Positrons with Molecular Hydrogen." In Atomic Physics with Positrons. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0963-5_8.

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Süvegh, K., and T. Marek. "Positron Annihilation Spectroscopies." In Handbook of Nuclear Chemistry. Springer US, 2011. http://dx.doi.org/10.1007/978-1-4419-0720-2_27.

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Geise, Geoffrey. "Positron Annihilation Spectroscopy." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_1151-2.

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Conference papers on the topic "The annihilation of positrons"

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Klym, Halyna, Yuriy Kostiv, and Ivan Hadzaman. "Positron Annihilation Lifetime Tools for Nanostructural Study of Spinel Ceramics." In 2024 IEEE 14th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2024. http://dx.doi.org/10.1109/nap62956.2024.10739704.

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Luna L., Carlos A. "Stimulated pair annihilation and a positronium annihilation laser." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wl5.

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I studied stimulated pair annihilation, and its probability is obtained according to Feynman rules. I also noted how this effect tested the nolocality of quantum mechanics. SPA is used to propose a positronium annihilation laser by using relativistic electrons and positrons and a periodical static magnet to produce the stimulating radiation and secure the coherence. Since the magnet period is practically limited to 5 × 10–3 m the minimum required energy is 109eV, which produces a frequency of 1030 Hz. Also, this kind of laser is tunable and an attempt is made to calculate gain that is not inve
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Britton, D. T. "Diffusion and annihilation of positrons in solids." In The fifth international workshop on slow positron beam techniques for solids and surfaces. AIP, 1994. http://dx.doi.org/10.1063/1.45494.

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Britton, D. T. "Time dependent diffusion and annihilation of positrons." In 4th International workshop on: Slow−positron beam techniques for solids and surfaces. AIP, 1991. http://dx.doi.org/10.1063/1.40185.

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Lambrecht, Marlies, and Abderrahim Almazouzi. "Positron Defect Studies of Neutron Irradiated Iron-Based Materials." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75108.

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The hardening and embrittlement of reactor pressure vessel steels is of great concern in the actual nuclear power plant life assessment. The embrittlement is caused by irradiation-induced damage, like vacancies, interstitials, solutes and their clusters. But the reason for the embrittlement of the material is not yet totally known. The real nature of the irradiation damage should thus be examined as well as its evolution in time. Positron annihilation spectroscopy has been shown to be a very good method for analyzing these defects. Both vacancy type clusters and precipitates can be visualized
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Wallyn, P., and Ph Durouchoux. "The annihilation of positrons in a molecular cloud." In COMPTON GAMMA-RAY OBSERVATORY. AIP, 1993. http://dx.doi.org/10.1063/1.44159.

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Wagner, Andreas, Maik Butterling, Maciej O. Liedke, Kay Potzger, and Reinhard Krause-Rehberg. "Positron annihilation lifetime and Doppler broadening spectroscopy at the ELBE facility." In INTERNATIONAL WORKSHOP ON PHYSICS WITH POSITRONS AT JEFFERSON LAB. Author(s), 2018. http://dx.doi.org/10.1063/1.5040215.

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Rubaszek, A., A. Kiejna, and S. Daniuk. "Annihilation characteristics for positrons trapped at the surfaces of simple metals." In The fifth international workshop on slow positron beam techniques for solids and surfaces. AIP, 1994. http://dx.doi.org/10.1063/1.45500.

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Wang, Shuai, Cheng Yin, Zhe Chen та ін. "Study of the porosity in cellulose acetate membranes by 3γ annihilation of positrons". У 3rd China-Japan Joint Workshop on Positron Science (JWPS2017). Japan Society of Applied Physics, 2018. http://dx.doi.org/10.7567/jjapcp.7.011202.

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Farrell, J. Paul, M. Murzina, John L. Remo, G. Merkel, and Noel A. Guardala. "Innovative method of using in-flight annihilation of fast positrons to detect explosives." In AeroSense '99, edited by Abinash C. Dubey, James F. Harvey, J. Thomas Broach, and Regina E. Dugan. SPIE, 1999. http://dx.doi.org/10.1117/12.357068.

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Reports on the topic "The annihilation of positrons"

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Colmenares, C., R. H. Howell, D. Ancheta, T. Cowan, J. Hanafee, and P. Sterne. First positron annihilation lifetime measurement of Pu. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/491854.

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Kaye, H. Stephen. Quark Flavor Identification In Electron-Positron Annihilation. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1453991.

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Chen, y. Computer Simulation of Electron Positron Annihilation Processes. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/826474.

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Naslund, Robert A., and Phillip L. Jones. Positron Annihilation Studies of Thermoplastic LCP Composites,. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada299436.

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Brodsky, Stanley J. Hunting for Glueballs in Electron-Positron Annihilation. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/813140.

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Nees, John A. Development of an Electron-Positron Source for Positron Annihilation Lifetime Spectroscopy. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada471027.

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Baden, A. R. Lambda production in electron-positron annihilation at 29 GeV. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/7010478.

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Brodsky, S. QCD PHYSICS OPPORTUNITIES IN LOW-ENERGY ELECTRON-POSITRON ANNIHILATION. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/826550.

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Kinzer, R. L., W. R. Purcell, W. N. Johnson, J. D. Kurfess, G. Jung, and J. Skibo. OSSE observations of positron annihilation in the galactic plane. Defense Technical Information Center, 1996. http://dx.doi.org/10.21236/ada464397.

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Gold, M. S. Hard photon processes in electron-positron annihilation at 29 GeV. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/7059641.

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