Pion PT distribution in hadron–nucleus interaction at accelerator energy

1980 ◽  
Vol 58 (7) ◽  
pp. 969-971 ◽  
Author(s):  
Dipak C. Ghosh
Keyword(s):  
Heavy Nucleus ◽  
Incident Beam ◽  
Beam Momentum ◽  
Nucleus Collision ◽  
Nucleus Interaction ◽  
Charged Pions

In the present work we have investigated the nature of the low PT distribution of secondary charged pions produced in p–nucleus collision in emulsion at the incident beam momentum 22.6 GeV/c. The general characteristics of the PT2 distribution have been found to be the same as in the case of hadron–hadron collisions. A comparison of the PT2 distribution for the two sets of reactions p – heavy nucleus (Nh > 6) and p – light (Nh ≤ 6) is also made.

scholarly journals Searching for Minimum in Dependence of Squared Speed-of-Sound on Collision Energy

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Fu-Hu Liu ◽  
Li-Na Gao ◽  
Roy A. Lacey
Keyword(s):  
Speed Of Sound ◽  
Center Of Mass ◽  
Incident Beam ◽  
Gluon Plasma ◽  
Beam Momentum ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Center Of Mass Energy ◽  
Knee Point ◽  
Charged Pions

Experimental results of the rapidity distributions of negatively charged pions produced in proton-proton (p-p) and beryllium-beryllium (Be-Be) collisions at different beam momentums, measured by the NA61/SHINE Collaboration at the super proton synchrotron (SPS), are described by a revised (three-source) Landau hydrodynamic model. The squared speed-of-sound parametercs2is then extracted from the width of rapidity distribution. There is a local minimum (knee point) which indicates a softest point in the equation of state (EoS) appearing at about40A GeV/c(or 8.8 GeV) incs2excitation function (the dependence ofcs2on incident beam momentum (or center-of-mass energy)). This knee point should be related to the searching for the onset of quark deconfinement and the critical point of quark-gluon plasma (QGP) phase transition.

Cluster production in hadron–nucleus interaction at cosmic-ray energies

1979 ◽  
Vol 57 (11) ◽  
pp. 2026-2029 ◽  
Author(s):  
Dipak Ghosh ◽  
Sadhan Naha ◽  
Jaya Roy ◽  
Anuradha Bhattacharjee ◽  
Topen Roy
Keyword(s):  
Heavy Nucleus ◽  
Energy Region ◽  
Cosmic Ray ◽  
Nucleon Nucleon ◽  
Independent Method ◽  
Nucleon Interaction ◽  
Nucleus Interaction ◽  
Charged Pions ◽  
Model Independent ◽  
Nucleon Nucleon Interaction

This paper presents a first investigation of the cluster production in nucleon – heavy nucleus collision in emulsion at cosmic ray energies (up to 1 TeV) following a model independent method proposed in a recent paper by Shivpuri and Gupta. It has been observed that the maximum charged pions constituting a cluster is three up to this energy and cluster characteristics are the same as in the case of nucleon–nucleon interaction in the same energy region.

LACBED with Quantitative Anomalous Absorption Corrections

1990 ◽  
Vol 48 (2) ◽  
pp. 528-529
Author(s):  
C.J. Rossouw ◽  
L.J. Allen ◽  
P.R. Miller
Keyword(s):  
Momentum Transfer ◽  
Scattering Amplitude ◽  
Incident Beam ◽  
Waller Factor ◽  
Beam Momentum ◽  
Anomalous Absorption ◽  
Quantitative Calculation ◽  
Ewald Sphere ◽  
Image Position ◽  
Incident Beam Energy

An Einstein model for thermal diffuse scattering (TDS) has enabled quantitative calculation of the absorptive potential V'(r). This allows anomalous absorption to be accounted for in LACBED contrast. Fourier coefficients Vg-h of the absorptive component from each atom α are calculated from integrals of the formwhere fα is the scattering amplitude and M(Q) the Debye-Waller factor. Integration over the Ewald sphere (dΩ) requires the momentum transfer q to have values up to 2ko (the incident beam momentum). Dynamical ‘dechannelling’ is accounted for by the terms g ≠ h. The crystal absorptive potential is obtained by coherently summing over these atomic absorptive potentials within the unit cell. Unlike the elastic potential, the absorptive potential is a strong function of incident beam energy Eo, since the range of momentum transfer q and associated solid angles dΩ change with the Ewald sphere radius.Fig. 1 shows a LACBED pattern of the zeroth order beam from Si aligned along a <001> zone axis.

Methods of statistical physics in heavy nucleus collision theory

1991 ◽  
Vol 44 (1) ◽  
pp. 315-318
Author(s):  
V. V. Ilyin ◽  
L. L. Jenkovszky ◽  
V. M. Khryapa ◽  
B. V. Struminsky
Keyword(s):  
Heavy Nucleus ◽  
Statistical Physics ◽  
Nucleus Collision ◽  
Collision Theory

DIFFRACTIVE AND COULOMB DISSOCIATION OF PIONS INTO THREE CHARGED PIONS AT LOW MOMENTUM TRANSFER AT COMPASS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 751-753 ◽  
Author(s):  
◽  
STEFANIE GRABMÜLLER
Keyword(s):  
Momentum Transfer ◽  
Coherent Scattering ◽  
Beam Momentum ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Lead Nucleus ◽  
Coulomb Dissociation ◽  
Photon Exchange ◽  
Charged Pions ◽  
Photo Production

This paper presents an analysis of π- Pb → X- Pb → π-π-π+ Pb events at 190 GeV/c beam momentum and low four-momentum transfer t′ < 0.01 ( GeV /c)2. Coherent scattering off the lead nucleus as a whole dominates with contributions from Reggeon, Pomeron and photon exchange. Photoproduction becomes apparent at lowest t′ and can be extracted statistically as well as by a partial-wave analysis, indicating also the overlap of diffractive and photo-production of the 3π events.

scholarly journals Kaon and Phi Production in Pion-Nucleus Reactions at 1.7 GeV/c *supported by the DFG cluster of excellence “Origin and Structure of the Universe” and SFB 1258

2018 ◽  
Vol 181 ◽  
pp. 01010 ◽  
Author(s):  
Joana Wirth
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Nuclear Reactions ◽  
Branching Ratio ◽  
Incident Beam ◽  
Beam Momentum ◽  
Detector System ◽  
Absorption Cross ◽  
Analysis Method ◽  
The Universe

Nuclear reactions, π−+A (A = C;W), at an incident beam momentum of 1:7 GeV/c were measured with the HADES setup at SIS18/GSI. Detailed investigations of the K+, K− and ϕ production off nuclei are connected to the study of hadron in-medium properties at nuclear saturation density. A contradictory role is played by the ϕ meson since the ϕN absorption cross-section is assumed to be small due to the OZI suppression which is in contrast to experimental observations. We present the analysis method to identify the ϕ meson exploiting the large K+K− branching ratio (≈ 50%). The correction for acceptance and effciency effects of the detector system will be discussed as well.

scholarly journals Multiparticle Production and Initial Quasitemperature from Proton-Induced Carbon Collisions at pLab=31 GeV/c

2020 ◽  
Vol 2020 ◽  
pp. 1-28
Author(s):  
Pei-Pin Yang ◽  
Mai-Ying Duan ◽  
Fu-Hu Liu ◽  
Raghunath Sahoo
Keyword(s):  
Boltzmann Distribution ◽  
Emission Angle ◽  
Target Thickness ◽  
Beam Momentum ◽  
Graphite Target ◽  
Experimental Conditions ◽  
Momentum Spectra ◽  
Charged Pions ◽  
Free Parameters ◽  
Longitudinal Position

The momentum spectra of charged pions (π+ and π−) and kaons (K+ and K−), as well as protons (p), produced in the beam proton-induced collisions in a 90 cm long graphite target (proton-carbon (p-C) collisions) at the beam momentum pLab=31 GeV/c are studied in the framework of a multisource thermal model by using Boltzmann distribution and the Monte Carlo method. The theoretical model results are approximately in agreement with the experimental data measured by the NA61/SHINE Collaboration. The related free parameters (effective temperature, rapidity shifts, and fraction of nonleading protons) and derived quantities (average transverse momentum and initial quasitemperature) under given experimental conditions are obtained. The considered free parameters and derived quantities are shown to be strongly dependent on the emission angle over a range from 0 to 380 mrad and weakly dependent on longitudinal position (graphite target thickness) over a range from 0 to 90 cm.

Resonance production and clustering effects in reactions K−p → Λ0 + pions at an incident beam momentum 8.25 GeV/c

1978 ◽  
Vol 140 (2) ◽  
pp. 249-270 ◽  
Author(s):  
Ch. Michaelidou ◽  
M. Kakoulidou ◽  
P. Michaelides ◽  
L. Sakelliou ◽  
G. Grammatikakis ◽  
...  
Keyword(s):  
Incident Beam ◽  
Beam Momentum ◽  
Resonance Production

scholarly journals Inclusive production of charged pions in p + C collisions at 158 GeV/c beam momentum

2007 ◽  
Vol 49 (4) ◽  
pp. 897-917 ◽  
Author(s):  
C. Alt ◽  
◽  
B. Baatar ◽  
D. Barna ◽  
G. Barr ◽  
...  
Keyword(s):  
Beam Momentum ◽  
Inclusive Production ◽  
Charged Pions
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