scholarly journals Measuring space-time properties of baryon resonances around 1 GeV using intensity correlations

2020 ◽  
Vol 1643 (1) ◽  
pp. 012010
Author(s):  
HE Qinghua
Keyword(s):  
Electromagnetic Calorimeter ◽  
Neutral Pions ◽  
Deuterium Target ◽  
Hydrogen Deuterium ◽  
Electron Photon ◽  
Photon Science ◽  
Bose Einstein ◽  
Photo Production ◽  
Baryon Resonances ◽  
Measuring Space

Abstract We measured the Δ(1232) radius using Bose-Einstein correlations (BEC) between two neutral pions from photo-production off a hydrogen/deuterium target at the incident photon energies around 1 GeV. The experiment was carried out at Research Center for Electron Photon Science (ELPH) in Tohoku University with a 4π electromagnetic calorimeter complex, named FOREST. For low-multiplicity BEC measurements, we developed an event mixing technique by introducing additional mixing constraints to delicately reduce the effect of other non-BEC correlations arising from global conservation law and resonance decays. In addition, a new BEC observing model was established to extract radius information from BEC effects in the presence of resonance decays.

Prototype Tests on a 200-W Forced Convection Liquid Hydrogen/Deuterium Target

1995 ◽  
pp. 241-247
Author(s):  
K. D. Williamson ◽  
J. E. Simmons ◽  
F. J. Edeskuty ◽  
J. H. Fretwell ◽  
J. T. Martin ◽  
...  
Keyword(s):  
Forced Convection ◽  
Liquid Hydrogen ◽  
Deuterium Target ◽  
Hydrogen Deuterium

Helium‐Cooled Liquid Hydrogen‐Deuterium Target

1956 ◽  
Vol 27 (7) ◽  
pp. 527-530 ◽  
Author(s):  
G. S. Janes ◽  
L. G. Hyman ◽  
C. J. Strumski
Keyword(s):  
Liquid Hydrogen ◽  
Deuterium Target ◽  
Hydrogen Deuterium

scholarly journals Double Helicity Asymmetries of Forward Neutral Pions from s = 510 GeV pp Collisions at STAR

2016 ◽  
Vol 40 ◽  
pp. 1660024
Author(s):  
Christopher J. Dilks
Keyword(s):  
Electromagnetic Calorimeter ◽  
Beam Polarization ◽  
Gluon Polarization ◽  
Pp Collisions ◽  
Forward Region ◽  
Neutral Pions ◽  
Pseudorapidity Range ◽  
Integrated Luminosity

Longitudinally polarized [Formula: see text] scattering experiments provide access to gluon polarization via measurement of the double helicity asymmetry, [Formula: see text]. At the completion of the 2013 RHIC running period, a significant dataset of [Formula: see text]s corresponding to an integrated luminosity of 46 [Formula: see text] (2012) and 8 [Formula: see text] (2013) produced from polarized [Formula: see text] scattering at [Formula: see text] GeV with an average beam polarization of approximately [Formula: see text] was acquired. The [Formula: see text] kinematics were measured via isolation cones by the STAR Forward Meson Spectrometer, an electromagnetic calorimeter covering a forward pseudorapidity range of [Formula: see text]. The asymmetric [Formula: see text] subprocess becomes more dominant in this forward region than in the midrapidity region; furthermore, asymmetry measurements in the forward region are sensitive to low-[Formula: see text] gluons. Progress on [Formula: see text] determined from forward [Formula: see text] events, complementing previous midrapidity measurements, are presented.

Light source based on a 100 mm-long monolithic undulator magnet with a very short 4 mm-period length

2019 ◽  
Vol 26 (6) ◽  
pp. 1902-1910 ◽  
Author(s):  
Shigeru Yamamoto ◽  
Shigeru Kashiwagi ◽  
Shinichi Masuda ◽  
Nobuhiko Nakanii ◽  
Tomonao Hosokai ◽  
...  
Keyword(s):  
Light Source ◽  
Field Measurements ◽  
Period Length ◽  
Calculated Spectrum ◽  
Fundamental Radiation ◽  
Novel Method ◽  
Electron Photon ◽  
Photon Science

A novel method to fabricate undulator magnets of a-few-millimetre-period length is being explored. Plate-type magnets, 100 mm-long with 4 mm-period length, have been successfully fabricated. They produce an undulator field of approximately 3 kG at a gap of 1.6 mm. Prototype undulators based on this technology have been constructed. Field measurements and characterization show that the quality of the undulator field of these plate magnets is sufficient for an undulator light source, and the calculated spectrum shows that the fundamental radiation emitted from this field is quite satisfactory. Test experiments for light generation using a real electron beam have been carried out at a test accelerator at the Research Center for Electron Photon Science (ELPH), Tohoku University, Japan, which is able to realize optics conditions to accept a very short gap of ∼1.6 mm. First observation and characterization of blue light was successfully accomplished.

The calibration of an LHCb electromagnetic calorimeter by recovering the invariant mass of neutral pions

2013 ◽  
Vol 68 (5) ◽  
pp. 360-366
Author(s):  
I. M. Belyaev ◽  
D. Yu. Golubkov ◽  
V. Yu. Egorychev ◽  
D. V. Savrina
Keyword(s):  
Invariant Mass ◽  
Electromagnetic Calorimeter ◽  
Neutral Pions

HADRON PHYSICS WITH MESON PHOTOPRODUCTION AT LEPS/SPRING-8

2011 ◽  
Vol 26 (03n04) ◽  
pp. 456-460 ◽  
Author(s):  
◽  
TOMOAKI HOTTA
Keyword(s):  
High Energy ◽  
Photon Beams ◽  
Meson Photoproduction ◽  
Hadron Physics ◽  
High Energy Electrons ◽  
Compton Backscattering ◽  
Large Acceptance ◽  
Electron Photon ◽  
Photo Production ◽  
Photoproduction Reactions

At the laser electron photon facility at SPring-8 (LEPS), meson photoproduction reactions have been studied by using highly polarized photon beams produced by the Compton backscattering of the laser off the high energy electrons. The recent activities at the LEPS experiment are overviewed. From the recent results, the meson photo-production reactions at the backward angles, and the photoproduction of Λ(1405) are discussed. In order to extend our study to wider kinematical range, construction of the new beamline and the large acceptance detector has been started.

A liquid hydrogen-deuterium target

Cryogenics ◽  
1980 ◽  
Vol 20 (8) ◽  
pp. 455-456 ◽  
Author(s):  
K.Sh. Agababyan ◽  
R.T. Mina ◽  
S.A. Melikyan ◽  
V.T. Tatoyan
Keyword(s):  
Liquid Hydrogen ◽  
Deuterium Target ◽  
Hydrogen Deuterium
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