The GBAR project (Gravitational Behaviour of Anti hydrogen at Rest) at CERN, aims to measure the free fall acceleration of ultracold neutral anti hydrogen atoms in the terrestrial gravitational field. The experiment consists preparing anti hydrogen ions (one antiproton and two positrons) and sympathetically cooling them with Be + ions to less than P. Pérez et al.10 μK. The ultracold ions will then be photo-ionized just above threshold, and the free fall time over a known distance measured. We will describe the project, the accuracy that can be reached by standard techniques, and discuss a possible improvement to reduce the vertical velocity spread.
Hadron electromagnetic form factor in the time-like region at the boundary of the physical region is considered. The energy behavior of the form factor is shown to be determined by the strong hadron-antihadron interaction. Imaginary parts of the scattering lengths for pp, ΛΛ, ΛΣ 0 (ΛΣ 0 ) and Σ 0Σ0 are estimated. Developed approach enables us to estimate imaginary part of the scattering volume from D * D * experimental data. The experiments to extract detailed information on the nearthreshold BB interaction from hadron form factor energy behavior are suggested.
The Extensive Air Showers (EAS) with delayed particles have been detected by the Horizon-10T experiment, located at the elevation of 3346 m above sea level near the city of Almaty, Republic of Kazakhstan. Among these EAS with delayed particles there were events that had signals with two distinct pulses (maximums or modes). Such pulses we call bimodal, and showers-bimodal events. This article presents the study of the properties of only bimodal events and comparison of these properties with the EAS that were simulated using the CORSIKA software package. This thorough comparison has shown that bimodal events cannot be explained only by known physical processes taking place in electron-hadron showers.
A total of 23500 Extensive Air Showers (EAS) with energies above ∼ 10 16 eV have been detected during the ∼3500 hours of the Horizon-T (HT) detectors system operations before Aug. 2016. Among these EAS, more than a thousand had an unusual spatial and temporary structure that showed pulses with several maxima (modals or modes) from several detection points of the HT at the same time. These modes are separated in time from each other starting from tens to thousands of ns. These EAS have been called multimodal. Analysis shows that the multi-modal EAS that have been detected by Horizon-T have the following properties:1. Multi-modal EAS have energy above ∼10 17 eV. 2. Pulses with several modes are located at large distances from the EAS axis.An overview of the collected data will be provided. General comments about the unusual structure of the multi-modal EAS will be presented.
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