Results 81 to 90 of about 4,639 (219)

Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector

Nukleonika, 2015
In this paper, we present prospects for using the Jagiellonian positron emission tomograph (J-PET) detector to search for discrete symmetries violations in a purely leptonic system of the positronium atom.
Kamińska Daria, Gajos Aleksander, Czerwiński Eryk, Bednarski Tomasz, Białas Piotr, Gorgol Marek, Jasińska Bożena, Kapłon Łukasz, Korcyl Grzegorz, Kowalski Paweł, Kozik Tomasz, Krzemień Wojciech, Kubicz Ewelina, Niedźwiecki Szymon, Pałka Marek, Raczyński Lech, Rudy Zbigniew, Rundel Oleksandr, Sharma Neha Gupta, Silarski Michał, Słomski Adam, Strzelecki Adam, Wieczorek Anna, Wiślicki Wojciech, Zieliński Marcin, Zgardzińska Bożena, Moskal Paweł   +26 more
doaj   +1 more source

Positronium Formation and Decay in Organic Scintillators for Neutrino Detection

, 2013
The detection of electron anti-neutrinos is generally carried out by searching for the coincidence of the reaction products, neutron and positron, in liquid scintillators.
CONSOLATI, GIOVANNI, D. Trezzi, D. Franco, G. Consolati   +3 more
core   +1 more source

Positronium formation at 4H SiC(0001) surfaces

, 2020
Positronium formation at 4H SiC(0001) surfaces were investigated upon the removal of natural oxide layers by hydrofluoric acid etching and heat treatment at 1000 K in ultra-high vacuum.
1011939, 岩森, 大直, Maekawa, Masaki, Kawasuso, Atsuo, 和田健, 宮下, 敦巳, Miyashita, Atsumi, 1011941, 1011940, 1011945, 1011944, 1011943, 1011942, 前川, 雅樹, 1011949, 1011948, 1011947, Ken, Wada, 1011946, Atsumi, Miyashita, 河裾, Atsuo, Kawasuso, Masaki, Maekawa, 飯田, 進平, 長嶋, 泰之, 1011952, 1011951, 1011950, 1011938, Wada, Ken   +29 more
core   +1 more source

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix

Nukleonika, 2015
The polystyrene doped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three
Wieczorek Anna, Zgardzińska Bożena, Jasińska Bożena, Gorgol Marek, Bednarski Tomasz, Białas Piotr, Czerwiński Eryk, Gajos Aleksander, Kamińska Daria, Kapłon Łukasz, Kochanowski Andrzej, Korcyl Grzegorz, Kowalski Paweł, Kozik Tomasz, Krzemień Wojciech, Kubicz Ewelina, Niedźwiecki Szymon, Pałka Marek, Raczyński Lech, Rudy Zbigniew, Rundel Oleksandr, Sharma Neha Gupta, Silarski Michał, Słomski Artur, Strzelecki Adam, Wiślicki Wojciech, Zieliński Marcin, Moskal Paweł   +27 more
doaj   +1 more source

Density and Crystallinity Correlations: Enhancing Moisture Barrier Properties in Poly(l‐Lactic Acid), Poly(d‐Lactic Acid), and Stereocomplex‐Poly(l,d‐Lactic Acid) Films

Journal of Applied Polymer Science, Volume 142, Issue 23, June 15, 2025.
ABSTRACT This study examines the relationship among the density, crystallinity, and moisture barrier properties of poly(l‐lactic acid) (PLLA), poly(d‐lactic acid) films (PDLA), and their PLLA/PDLA blends (85/15, 70/30, 50/50, and 30/70). Amorphous film samples display densities between 1,230 ± 6 and 1,243 ± 2 kg m−3, while semi‐crystalline samples show
James F. Macnamara Jr., Richard Vallery, David Gidley, Rafael Auras   +3 more
wiley   +1 more source

Positronium [PDF]

Annual Review of Nuclear and Particle Science, 1980
S Berko, H N Pendleton
openaire   +2 more sources

Cold neutral atoms via charge exchange from excited state positronium: a proposal

New Journal of Physics, 2017
We present a method for generating cold neutral atoms via charge exchange reactions between trapped ions and Rydberg positronium. The high charge exchange reaction cross section leads to efficient neutralisation of the ions and since the positronium-ion ...
W A Bertsche, M Charlton, S Eriksson
doaj   +1 more source

PDMS Membrane Using Phenyl as Rigid Molecular Spacer for Phenol Recovery

Engineering in Life Sciences, Volume 25, Issue 6, June 2025.
ABSTRACT Polydimethylsiloxane (PDMS) is extensively utilized for the recovery of bio‐alcohols, but it encounters significant obstacles in volatile organic compounds (VOCs) removal, because of the narrow size for molecules diffusion. In this work, we designed a high‐efficiency diffusion channel by introducing phenyl as a spacer into PDMS chains.
Xiangyan Li, Yan Zhuang, Chang Liu, Chenlin Zhang, Chao Sang, Lankun Wang, Siyu Pang, Hanzhu Wu, Songyuan Yao, Sitong Li, Zhihao Si, Xinmiao Zhang, Peiyong Qin   +12 more
wiley   +1 more source

Free Volume Space of Polymers as a New Functional Nanospace: Synthesis of Guest Polymers

Macromolecular Rapid Communications, Volume 46, Issue 8, April 2025.
A new functional nanospace has been found in conventional synthetic resins and rubbers. Free volume, nanoscale pore among polymer chains, is used as a reaction field for synthesis of conductive polymers. Functional composites with enhanced performances, such as mechanical, gas barrier, and conductive properties, are developed by the infiltration of the
Sayaka Hirai, Tomoki Sakuma, Yuki Tokura, Hiroaki Imai, Ryo Seishima, Kohei Shigeta, Koji Okabayashi, Yuya Oaki   +7 more
wiley   +1 more source

Positronium lifetime in polymers [PDF]

The Journal of Chemical Physics, 2004
A model describing the relationship between the orthopositronium lifetime and the volume of a void, located in a synthetic zeolite, is analyzed. Our idea, which allows us to take into account the effects of temperature, comprises the introduction of a non-Hermitian term in the Hamiltonian, which accounts for the annihilation of the orthopositronium ...
openaire   +3 more sources