NUCLEUS NUCLEUS --> PI0 X
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Production of $\gamma$ Quanta and Neutral Strange Particles in $d$ Ta and C Ta Interactions at 4.2-{GeV}/$c$ Per Nucleon

The Baku-Belgrade-Bucharest-Varna-Warsaw-Dubna-Yerevan-Kishinev-Moscow- Prague-Sofiya-Tbilisi-Ulan Bator collaboration Akhababian, N. ; Baatar, Ts. ; Baldin, A.M. ; et al.
Sov.J.Nucl.Phys. 37 (1983) 738, 1983.
Inspire Record 179220 DOI 10.17182/hepdata.39602

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


PROPERTIES OF THE C Ta INTERACTIONS WITH LAMBDA HYPERON AND K0 MESON PRODUCTION AT 4.2-GeV/c PER NUCLEON

Iovchev, K. ; Kanarek, T. ; Kladnitskaya, E.N. ; et al.
JINR-P1-84-279, 1984.
Inspire Record 202985 DOI 10.17182/hepdata.17552

None

14 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Photon and Neutral Pion Distributions in 60-agev and 200-agev $^{16}$O + Nucleus and Proton + Nucleus Reactions

The WA80 collaboration Albrecht, R. ; Awes, T.C. ; Baktash, C. ; et al.
Phys.Lett.B 201 (1988) 390-396, 1988.
Inspire Record 264256 DOI 10.17182/hepdata.29992

Transverse momentum ( p T ) distributions of inclusive photons and neutral pions at midrapidity are measured with a lead glass calorimeter in 60 and 200 A GeV 16 O + nucleus and proton + nucleus reactions . The variation of the average transverse momentum is investigated as function of centrality, determined by measurements of the remaining energy of the projectile and the charged particle multiplicity. For small values of the entropy, deduced from the multiplicity density, an increase in average p T is observed levelling off for larger values of entropy. The target-mass and energy dependence of π 0 p T distributions are presented.

15 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Transverse Momentum Distributions of Neutral Pions From Central and Peripheral $^{16}$O + Au Collisions at 200-a/{GeV}

The WA80 collaboration Albrecht, R. ; Awes, T.C. ; Baktash, C. ; et al.
Z.Phys.C 47 (1990) 367-376, 1990.
Inspire Record 276573 DOI 10.17182/hepdata.15159

The production of neutral pions by the interaction of 200A·GeV p and16O projectiles with a Au target has been studied in the pseudorapidity range 1.5≦η≦2.1. Transverse momentum spectra have been measured between 0.4 GeV/c and 3.6 GeV/c and their dependence on the centrality of the collision has been investigated. The peripheral-collision spectra display a marked change of slope with a hard component starting at about 1.8 GeV/c, in contrast to central-collision data. The data are discussed in comparison to p+p and α+α data from the ISR.

4 data tables
Table 1

Data obtained with minimum bias trigger conditions.

Table 2

Data obtained with minimum bias trigger conditions.

Table 3

Data for central collisions.

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Inclusive production of pi0 mesons in the reaction C-12 + C-12 --> pi0 + X at 4.5-GeV/c/nucleon.

Abraamian, Kh.U. ; Arkhipov, V.V. ; Izyurov, V.M. ; et al.
Sov.J.Nucl.Phys. 53 (1991) 297-299, 1991.
Inspire Record 305970 DOI 10.17182/hepdata.38296

None

1 data table
Table 1

No description provided.


Neutral meson production in relativistic heavy ion collisions

The TAPS collaboration Berg, F.D. ; Boonstra, A. ; Braak, H.P. ; et al.
Z.Phys.A 340 (1991) 297-302, 1991.
Inspire Record 324774 DOI 10.17182/hepdata.16588

The production ofπ0 andη mesons has been studied in the reactions20Ne +Al at 350 MeV/u and40Ar + Ca at 1.0 GeV/u. Rapidity distributions and transverse momentum spectra have been measured and are compared to thermal distributions.

2 data tables
Table 1

THE SPECTRUM (1/PT)*D(SIG)/D(PT) HAS BEEN FITTED BY A THERMAL DISTRIBUTION SQRT(MT)*EXP(-SLOPE*MT).

Table 2

THE SPECTRUM (1/PT)*D(SIG)/D(PT) HAS BEEN FITTED BY A THERMAL DISTRIBUTION SQRT(MT)*EXP(-SLOPE*MT).


Neutral pion production in the reactions O-16 + Al-27, Ni-58, Pb-208 at E(lab) = 95-MeV/nucleon

Moisan, C. ; de Takacsy, N. ; Barrette, J. ; et al.
Nucl.Phys.A 537 (1992) 667-691, 1992.
Inspire Record 337055 DOI 10.17182/hepdata.36690

The production of neutral pions has been studied in the 16 O+ 27 Al, 58 Ni, 208 Pb reactions at 95 MeV/nucleon. Inclusive pion differential distributions d σ d p t , d σ d T π , and d σ d Ω have been measured by detecting the two-pion decay γ-rays in a setup of 8 lead glass Cherenkov detector telescopes. The data are discussed in the framework of a moving thermal source model. It is shown that the shape of the pion energy spectra is better described if mean field effects on the primary pion-production cross section and pion reabsorption are included in the calculation.

6 data tables
Table 1

Axis error includes +- 10/10 contribution.

Table 2

SPECTRA WERE FITTED USING THE FORMULA D3(N)/D3(P)= CONST/(EXP(EKIN(P=3)/T)-1).

Table 3

Axis error includes +- 10/10 contribution.

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Investigation of pion absorption in heavy ion induced subthreshold pi0 production

Mayer, R.S. ; Henning, W. ; Holzmann, R. ; et al.
Phys.Rev.Lett. 70 (1993) 904-907, 1993.
Inspire Record 339110 DOI 10.17182/hepdata.42032

We present results from an experimental study of reabsorption effects in subthreshold π0 production in the reaction Xe129+197Au at 44 MeV/nucleon. Within the picture of pion generation in nucleon-nucleon scattering we deduce, from our data and from a comparison with the systematics of production cross sections available for lighter reaction systems, information on the π0 absorption length in nuclear matter. For the π0 kinetic-energy range ≃5–100 MeV the energy-averaged λabs and its momentum dependence are obtained, and compared with optical-model calculations.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Single photon and neutral meson production from WA80

The WA80 collaboration Santo, R. ; Albrecht, R. ; Awes, T.C. ; et al.
Nucl.Phys.A 566 (1994) 61C-68C, 1994.
Inspire Record 36273 DOI 10.17182/hepdata.9268

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Subthreshold pi0 production in the reactions Mg-24 (alpha, pi0) X at 43-MeV/A and Mg-24 (O-16, pi0) X at 24-MeV/A and 33-MeV/A

Waters, M. ; Machner, H. ; Gotta, D. ; et al.
Nucl.Phys.A 564 (1993) 595-608, 1993.
Inspire Record 365059 DOI 10.17182/hepdata.16594

The subthreshold production of neutral pions was studied in the reactions 24 Mg(α,π 0 )X at 43 MeV·. A and 24 Mg( 16 O,π 0 )X at 24 and 33 MeV·. A . The energies and emission angles of the two coincident photons from the π 0 -decay were measured with a lead glass shower detector. The cross sections of 3.5 and 6.6 nb from the 16 O-induced reactions are compatible with other experiments in this energy region. For the α-induced reaction a production cross section of 1.3 nb was found. Here, only 22 MeV above the absolute threshold, the pion emission from an excited Δ -nucleon hole state is strongly suppressed. The differential cross sections at very backward angles are by an order of magnitude bigger than the yields at 90° pointing to a strong absorption of the produced pions by the larger target nucleus.

1 data table
Table 1

No description provided.