Results 1 - 10 of 336
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[en] The Neutrino Mass Ordering (NMO) remains one of the outstanding questions in the field of neutrino physics. One strategy to measure the NMO is to observe matter effects in the oscillation pattern of atmospheric neutrinos above ∼1 GeV, as proposed for several next-generation neutrino experiments. Moreover, the existing IceCube DeepCore detector can already explore this type of measurement. We present the development and application of two independent analyses to search for the signature of the NMO with three years of DeepCore data. These analyses include a full treatment of systematic uncertainties and a statistically-rigorous method to determine the significance for the NMO from a fit to the data. Both analyses show that the dataset is fully compatible with both mass orderings. For the more sensitive analysis, we observe a preference for normal ordering with a p-value of p=15.3% and CL=53.3% for the inverted ordering hypothesis, while the experimental results from both analyses are consistent within their uncertainties. Since the result is independent of the value of δ and obtained from energies E≳5 GeV, it is complementary to recent results from long-baseline experiments. These analyses set the groundwork for the future of this measurement with more capable detectors, such as the IceCube Upgrade and the proposed PINGU detector.
[en] In this paper analytical expressions are derived to describe the spin motion of a particle in magnetic and electric fields in the presence of an axion field causing an oscillating electric dipole moment (EDM). These equations are used to estimate statistical sensitivities for axion searches at storage rings. The estimates obtained from the analytic expressions are compared to numerical estimates from simulations in Chang et al. (Phys Rev D 99(8):083002, 2019). A good agreement is found.
[en] For some years, it has become clear that climate change is having a major impact on water availability for agriculture and crop productivity. To improve the use of this resource in agriculture, it is essential to measure the water content of the soil. The Cosmic Ray Neutron Sensor (CRNS) has recently been used for measuring soil moisture content (SWC) in large areas and appears to become a credible and robust alternative to the other device.
[en] This research exhibits an integrated Inertial Navigation System (INS) and a camera-based navigation system. The system contains three types of sensors such as A camera, capturing the terrain. The raw image data are fed into an image-processing algorithm, the output of which is a set of recognizable points in the image, An IMU (Inertial Measurement Unit) containing gyroscopes and accelerometers, magnetometer. The miniaturization, reduced cost, and increased accuracy of cameras and inertial measurement units (IMU) makes them ideal sensors for determining the 3D position and attitude of vehicles navigating in GPS-denied areas. In particular, fast and highly dynamic motions can be precisely estimated over short periods of time by fusing rotational velocity and linear acceleration measurements provided by the IMU's gyroscopes and accelerometers, respectively. The integration of the bias and noise in the inertial measurements can be significantly reduced by processing observations to point features detected in camera images in what is known as a vision-aided inertial navigation system. (author)
[en] The article describes the experiments carried out from 2018 to 2019 at the DC-60 accelerator complex of Astana branch of the INP (Almaty, Kazakhstan) to develop methods for production of intense beams of multicharged ions of nickel, chrome, silicium, and cobalt with the use of volatile organometallic compounds MIVOC (Metal Ions from Volatile Compounds). As a result, for the first time at the DC-60 cyclotron beams of nickel, chrome, silicium, and cobalt ions were obtained. Acceleration modes of 58Ni11+, 52Cr10+, 28Si5+, and 59Co12+ ions to the energy of 1.75 MeV/nucleon are optimized.
[ru]Дано описание экспериментальных работ по получению высокоинтенсивных пучков ионов металлов из ЭЦР-источника циклотрона ДЦ-60 (Институт ядерной физики, Алма-Ата, Казахстан) с использованием метода испарения металлоорганических соединений MIVOC (Metal Ions from Volatile Compounds). В результате проведенных работ получены пучки ионов никеля, хрома, кремния и кобальта. Проведена оптимизация режимов ускорения полученных пучков ионов до энергии 1,75 МэВ/нуклон.
[en] A multifunctional module FADC for monitoring and measuring the parameters of a pulsed power source is introduced. This module was developed at the Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences and contains the following functional units: 16-bit analog-digital converter, pulse generator, logical signal registers, synchronization, CAN and Ethernet communication interfaces. The circuitry and the main characteristics are briefly described.
[ru]Представлен многофункциональный модуль FADC, разработанный в Институте ядерной физики СО РАН для контроля и измерения параметров импульсных источников питания. Данный модуль содержит следующие функциональные узлы: 16-битный аналого-цифровой преобразователь, генератор импульсов, регистры логических сигналов, синхронизацию, интерфейсы связи CAN и Ethernet. Кратко описана схемотехника, приведены основные характеристики модуля.
[en] In order to detect high frequency gravitational waves, we need a new detection method. In this paper, we develop a formalism for a gravitational wave detector using magnons in a cavity. Using Fermi normal coordinates and taking the non-relativistic limit, we obtain a Hamiltonian for magnons in gravitational wave backgrounds. Given the Hamiltonian, we show how to use the magnons for detecting high frequency gravitational waves. Furthermore, as a demonstration of the magnon gravitational wave detector, we give upper limits on GHz gravitational waves by utilizing known results of magnon experiments for an axion dark matter search.
[en] Implementation of a state of the art data acquisition and analysis program for variable low energy positron beam using LabVIEW based automation software is described. The program does the following functions: (a) controlling the remote programmable high voltage-power supply to bias the sample negatively (i.e., to vary the positron beam energy), (b) control of Windows based PCI MCA card, (c) calculating the S, W, R and ortho-positronium self-annihilation fraction (fPs) parameters, errors, and other relevant parameters, (d) saving the raw spectra, results and log data file and (e) dynamic display of raw spectrum and S, W, fPs versus energy for easy visualization of progress of the experiment. The USB based interfacing standard of this design provides easy connectivity to the personal computers. (author)
[en] DEAP-3600 is a liquid-argon scintillation detector looking for dark matter. Scintillation events in the liquid argon (LAr) are registered by 255 photomultiplier tubes (PMTs), and pulseshape discrimination (PSD) is used to suppress electromagnetic background events. The excellent PSD performance of LAr makes it a viable target for dark matter searches, and the LAr scintillation pulseshape discussed here is the basis of PSD. The observed pulseshape is a combination of LAr scintillation physics with detector effects. We present a model for the pulseshape of electromagnetic background events in the energy region of interest for dark matter searches. The model is composed of (a) LAr scintillation physics, including the so-called intermediate component, (b) the time response of the TPB wavelength shifter, including delayed TPB emission at O(ms) time-scales, and c) PMT response. TPB is the wavelength shifter of choice in most LAr detectors. We find that approximately 10% of the intensity of the wavelength-shifted light is in a long-lived state of TPB. This causes light from an event to spill into subsequent events to an extent not usually accounted for in the design and data analysis of LAr-based detectors.