Size of the proton emission region inp-C,d-C, ?-C and C-C interactions at 4.2 GeV/c per incident nucleon from two-proton correlations

Agakishiyev, G. N.; Mekhteev, R. R.; Boldea, V.; Ditza, S.; Bartke, J.; Kowalski, M.; Armutliyski, D.; Bogdanowicz, J.; Cheplakov, A.; Didenko, L.; Gasparian, A.P.; Grishin, V.G.; Ivanovskaya, I.A.; Kanarek, T.; Kladnitskaya, E.N.; Kopylova, D.K.; Lyubimov, V.B.; Miller, K.; Nikitina, V.F.; Pluta, J.; Soloviev, M. I.; Togoo, R.; Toneeva, G.P.; Chubarian, M.Ya.; Bekmirzayev, R. N.; Sherkulov, U.D.; Metreveli, Z.; Strugalski, Z.

doi:10.1007/bf01289570

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…In contrary, results from Dubna [18,19] concerning two-proton correlations show a very significant decrease of the measured source radii when going from low to high energy protons. The same behaviour of the source sizes is observed as a function of the transverse momentum of the proton pair.…”

Section: Results I)contrasting

confidence: 62%

Baryon-Baryon correlations at small relative momentum in Neon- and Argon-nucleus collisions betweenE/A=200 and 1000 MeV

Dupieux

Alard

Charmensat

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Two-proton correlation functions at small relative momentum have been systematically studied with the large solid angle detector DIOGENE at Saturne for interactions induced by Ne and Ar beams on various targets, and incident energies per nucleon ranging from 200 to 1000 MeV. From these distributions, informations on the space-time structure of the source have been derived as a function of the centrality of the collision, the targetprojectile combinations and the incident energy, using the model of Koonin. Special attention has been devoted to take into account all experimental biases in order to get the distorted theoretical correlation curves before comparison to the experimental data. Other interesting conclusions have been obtained when comparing the extracted source radii to the dimensions of the overlapping volume of target by projectile in a pure geometrical model of the collision (clean cut geometry). Some results concerning fragment-fragment small angle correlations are also presented. PACS: 25.70. -z Two-particle correlations at small relative momentum allow to determine the size (and the lifetime) of the emitting source in a quite direct way. It is clear that two particles close in velocity are sensitive to the space-time extension of the emitting source through Coulomb and nuclear interactions, and also through statistical effects, according to whether they are fermions or bosons. The method of proton, composite particle or pion correlations is well suited for the study of heavy ion collisions where many efforts are still to be made to investigate the interacting region. Interesting results have already been obtained showing differences between collisions at very different [2][3][4][5] for the most energetic particles; but it is also possible that the emission time intervals are smaller for these particles, leading to the interpretation of smaller sources. When the correlation is analyzed for different orientations of the relative momentum [6], it has been found that the most energetic particles are emitted from a short-lived source of the size of the compound-nucleus, while the low-energy protons appear to be emitted from a source considerably larger than the compound-nucleus. At CERN-SPS energies [7], surprisingly large transverse sizes have been found for the source of mid-rapidity particles but the interpretation is not yet clear.In the intermediate energy range MeV per nucleon), many correlation results seem to confirm the validity of the participant-spectator model and the existence of a fireball; the source sizes increase with increasing target-projectile mass [8] and centrality of the collision [9]. Moreover, many zr -z~ correlation results [10, 11] indicate that the source sizes are smaller for the higher energy particles (but emission time effects cannot be excluded in this case too).The two-particle correlation method is intrinsically sensitive to final-state interactions and the results are significant of the latest stage of deexcitation of the fireball when the collisions between parti...

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Section: Results I)contrasting

confidence: 62%

Baryon-Baryon correlations at small relative momentum in Neon- and Argon-nucleus collisions betweenE/A=200 and 1000 MeV

Dupieux

Alard

Charmensat

et al. 1991

Z. Physik A - Hadrons and Nuclei

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“…In Table 2 we compare our resuits with all known values of r pp and r ~ in hadron interactions with light nuclei [11,[15][16][17][18][19]. All r values in the references of Table 2 were converted, if necessary, to rms values.…”

Section: R~p(q) Is Shown Inmentioning

confidence: 99%

Inelastic electron-nucleus interactions at 5 GeV detected by ARGUS

Degtyarenko

Efremenko

Gavrilov

et al. 1990

Z. Physik A - Atomic Nuclei

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Beam-gas events taken with the ARGUS detector at the e + e--storage ring DORIS-II have been used to study interactions of e + at 5 GeV with light nuclei mainly 160. The selection of e + 160 events is discussed. The spectra of secondary protons and charged pions are found to be similar to those of hA interactions in accordance with the nuclear scaling. Measurements of like-particle (p p and rc re) correlations at small relative momenta were used to determine the radius of particle emission region in e + x60 interactions. This radius proved to be equal within errors to the radius of particle emission region in hC interactions. No any narrow diproton resonance has been observed in the mass region from 1.9 to 2.2 GeV.

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“…Carbon was the lightest target [17]. Two possible reasons were discussed to explain such effect [14,18]: (i) the correlation between the lifetime of the source and the protons momenta; (ii) the decrease of the perpendicular size of the emitting region with the proton momentum and consequently the nonspherical volume of the proton emission volume.…”

Section: Proton-proton Correlationmentioning

confidence: 99%

Proton-proton and deuteron-deuteron correlations in interactions of relativistic helium nuclei with protons

Gałązka-Friedman

Sobczak

Steṕaniak

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract. The reactions ~Hep ~pp+X, 3Hep ~pp+X and 4Hep ~ ddp have been investigated and the correlation function has been measured for protons and deuterons with small relative momenta. Strong positive correlation has been observed for protons related mainly to the final state interactions in ~So state. The root mean square radius of the proton source calculated from the correlation function has been found to be equal to (1.7+0.3) fm and (2.1_+0.3) fm for 4He and 3He respectively. It agrees with the known radii of these nuclei.

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Size of the proton emission region inp-C,d-C, ?-C and C-C interactions at 4.2 GeV/c per incident nucleon from two-proton correlations

Cited by 4 publications

References 5 publications

Baryon-Baryon correlations at small relative momentum in Neon- and Argon-nucleus collisions betweenE/A=200 and 1000 MeV

Baryon-Baryon correlations at small relative momentum in Neon- and Argon-nucleus collisions betweenE/A=200 and 1000 MeV

Inelastic electron-nucleus interactions at 5 GeV detected by ARGUS

Proton-proton and deuteron-deuteron correlations in interactions of relativistic helium nuclei with protons

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