646 research outputs found
Search for the 4He-eta bound state with WASA-at-COSY
We conduct a search for the 4He-eta bound state with WASA-at-COSY facility,
via a measurement of the excitation functions for the dd->3Heppi- reaction,
where the outgoing p-pi- pairs originate from the conversion of the eta meson
on a nucleon inside the He nucleus. Determination of the profile of the
excitation curve below the threshold of the dd->4He-eta reaction will allow to
establish the binding energy and the width of the He-eta bound state. In June,
2008 first measurements of the excitation functions for the dd->3Heppi-
reaction were performed. In the experiment we used a slowly ramped COSY
deuteron beam, scanning the range of momenta corresponding to the variation of
the excess energy for the 4He-eta system from -51.4 MeV to 22 MeV.Comment: Presented at 8th International Conference on Nuclear Physics at
Storage Rings-Stori11,October 9-14, 2011, Laboratori Nazionali di Frascati
dell'INFN, Italy. 8 pages, 5 figure
Mixing and CPV in charm hadrons at LHCb
LHCb continues to expand its world-leading sample of charmed hadrons
collected during LHC's Run 1 (2010-2012) and Run 2 (2015-present). This sample
is yielding some of the most stringent tests of the Standard Model
understanding of charm physics. This includes precise measurements of the
neutral D-meson mixing parameters and some of the most sensitive searches for
direct and indirect CP violation in charm interactions.Comment: 6 pages, 1 figure, presented at 21st Particles and Nuclei
International Conference 2017 (PANIC 2017
Status and Perspectives of the Search for Eta-Mesic Nuclei
In this report the search for eta-mesic nuclei is reviewed. The brief
description of the experimental studies is presented with a focus on the
possible production of the eta-nucleus bound states for light nuclei like 4He
and 3He.Comment: Conference Proceedings: The 11th Latin American Symposium on Nuclear
Physics and Applications (XI LASNPA), 30.11-04.12.2015, Medellin, Columbi
Search for eta-mesic nuclei with WASA-at-COSY
We search for an evidence of eta-mesic He with the WASA detector. Two
dedicated experiments were performed at the Cooler Synchrotron COSY-Juelich.
The experimental method is based on the measurement of the excitation functions
for the two reaction channels: dd->3Heppi- and dd->3Henpi0, where the outgoing
N-pi pairs originate from the conversion of the eta meson on a nucleon inside
the He nucleus.In this contribution, the experimental method is shortly
described and the current status of the analysis is presented.Comment: 5 pages, 2 figure
Search for the manifestation of the mesic-nuclei on the dd-->3HeNpi excitation function measured with WASA-at-COSY
We search for an evidence of eta-mesic 4He with the WASA-at-COSY detector.
Two dedicated experiments were performed at the Cooler Synchrotron
COSY-Juelich. The experimental method is based on the measurement of the
excitation functions for the two reaction channels: dd-->3Heppi- and
dd-->3Henpi0, where the outgoing N-pi pairs originate from the conversion of
the eta meson on a nucleon inside the He nucleus. In this contribution, the
experimental method is shortly described and preliminary excitation functions
from the 2010 data are presented.Comment: 8 pages, 12 figures, Presented at International Symposium on Mesic
Nuclei, Krakow, Sept. 20, 201
J-PET Framework: Software platform for PET tomography data reconstruction and analysis
J-PET Framework is an open-source software platform for data analysis,
written in C++ and based on the ROOT package. It provides a common environment
for implementation of reconstruction, calibration and filtering procedures, as
well as for user-level analyses of Positron Emission Tomography data. The
library contains a set of building blocks that can be combined by users with
even little programming experience, into chains of processing tasks through a
convenient, simple and well-documented API. The generic input-output interface
allows processing the data from various sources: low-level data from the
tomography acquisition system or from diagnostic setups such as digital
oscilloscopes, as well as high-level tomography structures e.g. sinograms or a
list of lines-of-response. Moreover, the environment can be interfaced with
Monte Carlo simulation packages such as GEANT and GATE, which are commonly used
in the medical scientific community.Comment: 14 pages, 5 figure
Development of the normalization method for the Jagiellonian PET scanner
This work aims at applying the theory of the component-based normalization
for the Jagiellonian PET scanner, currently under development at the
Jagiellonian University. In any Positron Emission Tomography acquisition,
efficiency along a line-of-response can vary due to several physical and
geometrical effects, leading to severe artifacts in the reconstructed image. To
mitigate these effects, a normalization coefficient is applied to each
line-of-response, defined as the product of several components. Specificity of
the Jagiellonian PET scanner geometry is taken into account. Results obtained
from GATE simulations are compared with preliminary results obtained from
experimental data.Comment: 8 pages, 6 figures, submitted to Acta Physica Polonica
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