P. Nomokonov

The slope parameter of the differential cross-section of elastic p-p scattering in energy range 12–70 GeV

Abstract The measurements of the differential cross section of elastic p-p scattering in relative units were performed in the energy range of 12–70 GeV. The values of the slope parameter were obtained from this data. It was shown that the slope parameter of the differential p-p scattering is monotonously increasing when the proton energy rises in the range 12–70 GeV. We have obtained the slope Pomeranchuks pole trajectory from this data: α′ p = 0.40 ± 0.09.

Small angle proton-proton elastic scattering from 9 to 70 GeV/c

Proton-proton elastic scattering has been measured over the four-momentum transfer squared 0.0007 ⩽ t ⩽ 0.02 GeV2/c2. A gas hydrogen jet has been used as an internal target of the accelerator. The results indicate that the ratio of the real to the imaginary part of the proton-proton forward scattering amplitude rises smoothly with increasing energy from α = −0.35 ± 0.05 at p = 9.39 GeV/c to α = −0.092 ± 0.011 at p = 69.8 GeV/c.

Systematics in the light response of BGO, CsI(T1) and GSO(Ce) scintillators to charged particles

The light response of a BGO crystal has been measured for particles Z = 1-8, A = 1-16 in the energy range similar to2-60 A MeV. The reaction products are identified by a DeltaE(Si) - E(Sci/PD) telescope, The position of the jump in the value of the signal from the PD at the punch-through points is used to calibrate both the DeltaE(Si) and E(Sci/PD) scales in MeV. The dependence of the light output on the energy E, ion atomic number Z and mass A is parameterized by the power law relation, L(Z, A, E) = a(1)((Z, A))E(a2(Z, A)). The parameters a(1) and a(2) have a smooth dependence on Z for all three crystals. The mass dependence of a(1), a(2) is deduced as a simple analytical expression, The systematics of these parameters is presented for BGO, CsI(Tl) and GSO(Ce) scintillators as a function of Z, A. Calculations of the response function, based on the Murray-Mayer model provide an excellent description of the shape of L(Z, A, E) versus E dependence, but show some deviations in the individual ion normalization constant for the BGO and GSO(Ce) scintillators

Differential cross sections of elastic pp scattering in the energy range 8–70 GeV

Abstract In this paper we present tables of absolute differential cross sections of elastic pp scattering together with the values of the slope parameter B and the real-part parameter α, where B= d d t In dσ d t α= Re A(0) Im A(0) and A (0) is the amplitude of elastic pp scattering at t = 0. The cross-section data have been obtained at the Serpukhov accelerator from 8 to 70 GeV in the | t |-range 0.0007 − 0.12 (GeV/ c ) 2 .

On-beam calibration of the ΔE(Si)–Sci/PD charged particle telescope

Abstract The reaction products emitted in the 14 N (45 A MeV )+( CH 2 / CD 2 ) interactions are identified by a Δ E (Si)– E (Scintillator/Photodiode) telescope by the conventional Δ E – E method. The position of “jumps” in the amplitude of the photodiode signal for ions passing through the scintillator (Sci) is used to calibrate on-beam both the Δ E and the Sci/PD scales in MeV. The accuracy of an absolute energy calibration is better than 2.3% and 1.8% for CsI(Tl) and GSO(Ce) detectors, respectively. It is defined mostly by the correctness of the range-energy relations of ions in the Si and Sci crystals. The light response function, L ( E , Z , A ), of isotopes up to Z ( A )=8(16) in the range of energy ∼(2.5–60) A MeV is extracted. The effects of doping concentration and pulse shaping on the light response are analyzed. The validity of the existing empirical light-energy relations is checked in a wide interval of ion energies and a new power law relation is proposed. Calculations of the response function based on the Murray–Mayer model are found to be in excellent agreement with experimental data for the CsI(Tl) crystal.

Differential cross sections of elastic pd scattering in the energy range 10–70 GeV

We present tables of the absolute differential cross sections of elastic pd scattering. The cross-section data have been obtained at the Serpukhov accelerator from 10 to 70 GeV in the |t|-range 0.002–0.2 GeV2/c2. The elastic pd scattering amplitude was parametrised as A(+)=dσd+12opt(i+α)exp12(Bt+Ct 2) The values α=ReA(0)ImA(0),B and C are presented in these tables.

Azimuthal anisotropy of photon and charged particle emission in Pb-208+Pb-208 collisions at 158 center dot A GeV/c

The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in Pb-208 + Pb-208 collisions at 158 (.) A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.Abstract.The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in 208Pb + 208Pb collisions at 158

Emission of light fragments 3H, 3He and 4He in 4He-nucleus collisions at 3.33 GeV/N kinetic energy

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Inverse Kinematics Studies of Intermediate‐Energy Reactions Relevant for SEE and Medical Problems

GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.

Small angle proton-proton correlations in collisions of high energy light ions with carbon and gold nuclei☆

Abstract Inclusive cross sections for the emission of 3H, 3He and 4He at laboratory angles of 45°, 90° and 135° in collisions of 4He with targets of 9Be, 12C, 27Al, 64Cu, 108Ag and 197Au at a beam kinetic energy of 3.33 GeV/nucleon are presented. Assuming the existence of an intermediate object emitting fragments, we have found its velocity and temperature for different fragment energies. It is shown that the velocity and temperature continuously increase with the fragment energy under consideration. The evaporation mechanism is discussed, and it is argued that the evaporation significantly contributes to the yield of fragments with energy less than 50 MeV. The considered 3H to 3He ratio is found to be larger than the neutron to proton ratio in the emitting system. Comparing 3H and 3He spectra, an important role of the Coulomb barrier is shown. The At dependence of the yield of the fragments is studied. The experimental spectra are compared with thermodynamic firestreak model predictions. The model is successful in describing the emission of fragments with energy greater than 50 MeV.