37 research outputs found
Luminosity determination for the proton-deuteron reaction using pd -> 3He eta channel with WASA-at-COSY detector
In this report one of the methods used for the luminosity determination for
the experiment performed by WASA Collaboration to search for 3He-eta mesic
nuclei is presented. The method is based on the analysis of pd -> 3He eta
process
Production and interaction of the eta meson with nucleons and nuclei
We report on the status of the search for eta-mesic nuclei and the studies of
the interaction of the eta meson with nucleons. Recently we have completed the
analysis of the new WASA-at-COSY data on the production of the eta meson with
polarized proton beam. New results on the analyzing power for the pp->ppeta
reaction with more than an order of magnitude improved precision shed a new
light on the production mechanism of the eta meson in nucleon-nucleon
collisions. Also, the latest results of the search for eta-mesic nuclei are
discussed.Comment: 4 pages, presented at 14th International Workshop on Meson
Production, Properties and Interaction KRAK\'OW, POLAND (MESON 2016),
accepted for publication in EP
Luminosity determination for the proton-deutron reactions using quasi-free reactions with WASA-at-COSY facility
The scientific aim of our research is experimental confirmation of the existence of mesic-nucleus: a new exotic kind of nuclear matter consisting of nucleons and mesons. In this report we present the method of luminosity determination for experiment performed atWASA-at-COSY detector dedicated to search for 3He-η bound state. This method is based on analysis of quasi-free reaction
Sampling FEE and trigger-less DAQ for the J-PET scanner
In this paper, we present a complete Data Acquisition System (DAQ) together with the readout mechanisms for the J-PET tomography scanner. In general, detector readout chain is constructed out of Front-End Electronics (FEE) measurement devices such as Time-to-Digital or Analog-to-Digital Converters (TDCs or ADCs), data collectors and storage. We have developed a system capable for maintaining continuous readout of digitized data without preliminary selection. Such operation mode results in up to 8 Gbps data stream, therefore, it is required to introduce a dedicated module for on-line event building and feature extraction. The Central Controller Module, equipped with Xilinx Zynq SoC and 16 optical transceivers, serves as such true real time computing facility. Our solution for the continuous data recording (trigger-less) is a novel approach in such detector systems and assures that most of the information is preserved on the storage for further, high-level processing. Signal discrimination applies a unique method of using LVDS buffers located in the FPGA fabric
Luminosity determination for the proton-deutron reactions using quasi-free reactions with WASA-at-COSY facility
The scientific aim of our research is experimental confirmation of the existence of mesic-nucleus: a new exotic kind of nuclear matter consisting of nucleons and mesons. In this report we present the method of luminosity determination for experiment performed atWASA-at-COSY detector dedicated to search for 3He-η bound state. This method is based on analysis of quasi-free pd→ppnspec reaction
Search for -mesic in non-mesonic final state
The experiment on searching for η-mesic 3He nucleus was performed in May 2014 at COSY accelerator in Juelich by WASA-at-COSY Collaboration. The measurements were carried out using ramped beam technique which allows for the slow and continuous beam momentum change near the threshold of η meson creation. The luminosity was obtained based on pd → 3Heη reaction and quasielastic proton-proton scattering. The bound state of η-meson and 3He nucleus is searched for in pd → 3He2γ and pd → 3He6γ channels. The analysis is still in progress and the estimated upper limit value is on the level of few nanobarns
Search for η-mesic 3He in non-mesonic final state
The experiment on searching for η-mesic 3He nucleus was performed in May 2014 at COSY accelerator in Juelich by WASA-at-COSY Collaboration. The measurements were carried out using ramped beam technique which allows for the slow and continuous beam momentum change near the threshold of η meson creation. The luminosity was obtained based on pd → 3Heη reaction and quasielastic proton-proton scattering. The bound state of η-meson and 3He nucleus is searched for in pd → 3He2γ and pd → 3He6γ channels. The analysis is still in progress and the estimated upper limit value is on the level of few nanobarns