GRAAL: a polarized γ-ray beam at ESRF Bocquet, J.P.; Ajaka, J.; Anghinolfi, M. ...
Nuclear Physics A,
08/1997, Letnik:
622, Številka:
1-2
Journal Article, Conference Proceeding
Recenzirano
The GRAAL facility produces a highly polarized gamma-ray beam by Compton scattering of laser photons on the electrons of the European Synchrotron Radiation Facility (ESRF) at Grenoble. Preliminary ...results have been obtained with the LAGRANGE detector showing its excellent performances.
The results of X-ray diagnostics of plasma created at a material surface by a laser pulse with an intensity of up to 2.5 × 10
18
W/cm
2
are presented. The experimental data are compared with the ...results of numerical modeling of the laser-plasma interaction while accounting for the detector-response function. Examples of possible nuclear problems that can be solved with the use of laser plasma as a source of charged particles and X-ray quanta are given.
Experimental data of the GRAAL Collaboration on the total cross sections for photoabsorption on deuterium and carbon targets at gamma-ray energies in the range between 600 and 1500 MeV are presented. ...The experiment was performed in a beam of photons obtained by the method of the Compton backscattering of laser photons at the electron storage ring of the European Synchrotron Radiation Facility (ESRF, Grenoble, France) by using a wide-aperture detector covering a solid angle close to 4
π
. The total photoabsorption cross sections were determined by two independent methods: by subtracting the emptytarget background and by summing partial cross sections for meson photoproduction. The total cross sections for photoabsorption on quasifree protons and neutrons are shown to agree both in magnitude and in shape within a 5% precision of the measurements. In contrast to data previously available in the literature, both cross sections show distinctly the
F
15
(1680) resonance at a photon energy of about 1 GeV. Data obtained in the present experiment for the cross sections for photoabsorption on a free and a bound nucleon are compared. This comparison reveals a substantial role of two-nucleon correlations in estimating the nuclear-medium effect on meson photoproduction.
Neutron detection efficiency of BGO calorimeter at GRAAL Bartalini, O.; Bellini, V.; Bocquet, J.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2006, Letnik:
562, Številka:
1
Journal Article
Recenzirano
Experimental results on the neutron detection efficiency of the GRAAL BGO calorimeter obtained from a study of
γ
p
→
π
+
n
reaction are reported. Pulse height spectra were measured for neutron ...energies from 80 to 650
MeV. A comparison of the experimental data with a GEANT-based simulation is presented.
The photoproduction of double π0 on the neutron is studied in the beam energy range of 0.6 up to 1.5 GeV, using a liquid deuterium target. The cross section and the beam asymmetry are extracted and ...compared to those previously obtained on a proton target. The theoretical interpretation of these results is given using different models.
The photoproduction of double $\pi^0$ on the neutron is studied in the beam energy range of 0.6 up to 1.5 GeV, using a liquid deuterium target. The cross section and the beam asymmetry are extracted ...and compared to those previously obtained on a proton target. The theoretical interpretation of these results is given using different models.
New experimental approach to study meson photoproduction in nuclei is discussed. It is based on the measurement of the recoil nucleon as a tagger for identification of the initial step of reaction. ...Propagation of mesons and nucleons within a nucleus is described by the Intra-Nuclear Cascade (INC) model. Simulations and preliminary experimental data for the deuteron target obtained at GRAAL are presented.
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