Physics of Particles and Nuclei最新文献

In this paper, we consider the problem of searching for an element in a dictionary. Various approaches to solving this problem have been proposed in recent decades: classical and quantum algorithms. We present two algorithms: a hybrid classical-quantum algorithm [1], that implements Grover’s search, and a “pure” quantum algorithm based on the quantum fingerprinting technique. Both algorithms work (a) with a high probability of obtaining the correct result and (b) with a quadratic query acceleration compared to the classical one. Our algorithms are much more memory efficient in terms of the number of qubits used compared to previously known quantum algorithms.

A measure of entanglement production by quantum operations is suggested. This measure is general, being valid for operations over pure states as well as over mixed states, for equilibrium as well as for nonequilibrium processes. The measure of entanglement production satisfies all properties typical of such a characteristic. Systems of arbitrary nature can be treated, described by field operators, spin operators, or any other operators, which is realized by defining generalized correlation matrices. Particular cases of entanglement production are considered.

In this universe, the matter-antimatter asymmetry is one of the major mysteries. This baryonic asymmetry can not be fully described within the current frame of standard model rather than we need to go beyond standard model of physics (BSM) but the main problem of BSM is that it is restricted by many complicated boundaries. In search of BSM, we need to prove CPT violation in nature, though CP violation has been observed already but this violation anticipated by the standard model is very small to describe the magnitude of baryonic asymmetry and search for T-violation is still ongoing. Neutron Optics Parity and Time Reversal Experiment (NOPTREX) is one such experiment that is working on the larger search for proof of time reversal violation(TRV). This experiment specifically seeks to investigate time-reversal violation in neutron interactions with heavy nuclei under specific conditions of narrow neutron-nuclear resonances, particularly focusing on orbital angular momentum L = 1. The investigation involves examining potential phase shifts in the transmitted neutron wave function, specifically looking at a term represented by (S = {{sigma }_{n}}({{k}_{n}} times I)), where ({{sigma }_{n}}) denotes the neutron spin, ({{k}_{n}}) signifies the neutron momentum, and I represents the nucleus spin.This paper delves into the historical evolution of research on Time Reversal Violation (TRV), offering insights into the core concept of time reversal symmetry and its significance in modern physics. This review work will provide an overview of the NOPTREX experiment’s setup, findings, and its exploration of TRV in neutral meson decays under conditions devoid of magnetic fields, meticulously examining the outcomes and past, present and future of the NOPTREX experiment.

The status of the study of (2403 pm 98) events of the ({{pi }^{ - }} + {text{Be}} to ;phi {{pi }^{0}}; + ;A{kern 1pt}^{*}) reaction collected in the exposition of a Be target of the VES setup to (2.5 times {{10}^{{11}}}) ({{pi }^{ - }}) mesons with a momentum of 29 GeV/c is presented. The (phi {{pi }^{0}}) production in the vector state predominantly associated with the (Delta (1232)) isobar in the process with (pi )-exchange dominance is observed. The (phi {{pi }^{0}}) mass spectrum has a complicated shape.

The paper presents in detail the methodology for simulation radiation conditions during operation of stations and channels for applied research SIMBO and ISCRA of the NICA complex of JINR. The Monte Carlo program FLUKA was used for simulation. The calculation results for the main operating modes of the stations are presented and discussed. The limiting intensities, at which the established zoning for the personnel is observed, are calculated. The obtained estimates show that the adopted design solutions ensure compliance with radiation safety standards during operation of stations with the limiting beam intensities determined as a result of simulation.

The magnetic measurement systems based on the wire’s techniques are universal and potential precision. Achieve to necessary measurement’s precision requires to calibration of the measurement equipment and a decreasing of systematic errors at the commissioning stage. This work describes an experience of based-on-wire magnetic measurement system commissioning for measure the magnets of the NICA accelerator complex at the Joint Institute for Nuclear Research (Dubna).

The problem of computing functional integrals in quantum mechanics models is considered. Functional integrals in models of the harmonic oscillator, double well potential, and Morse potential were computed using a neural network algorithm for normalizing flows. A comparison was made with results obtained from Monte Carlo simulation.

Using the Newman–Janis algorithm, rotating solutions were obtained for the Horndesky and bumblebee models. Mathematical modelling of black hole shadow profiles was conducted for the case of the two most probable configurations of Sgr A*. As a result, it is shown that the Horndesky model weakens the rotation effect (like gravity with nonlocal corrections), while the bumblebee model, in contrast, enhances it.

The main methods for measuring the cross sections in the VES experiment, which studies meson-nuclear interactions on a fixed target at a beam momentum of 29 GeV/c, are presented. A comparative analysis of different methods has been performed, their systematic errors have been estimated, and the verification of these methods based on the reactions with known cross sections is presented. Special attention is paid to the beam intensity-dependent effects in the measurements of cross sections.