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Anti-proton production in relativistic Si nucleus collisions

The E814 collaboration Barrette, J. ; Bellwied, R. ; Braun-Munzinger, P. ; et al.
Phys.Rev.Lett. 70 (1993) 1763-1766, 1993.
Inspire Record 358657 DOI 10.17182/hepdata.19760

We have measured antiproton production cross sections as functions of centrality in collisions of 14.6 GeV/c per nucleon Si28 ions with targets of Al, Cu, and Pb. For all targets, the antiproton yields increase linearly with the number of projectile nucleons that have interacted, and show little target dependence. We discuss the implications of this result on the production and absorption of antiprotons within the nuclear medium.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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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.


Isotope composition of fragments produced in high-energy 0-16 p interaction

Glagolev, V.V. ; Gulamov, K.G. ; Kratenko, M.Yu. ; et al.
JETP Lett. 58 (1993) 497-501, 1993.
Inspire Record 365324 DOI 10.17182/hepdata.16885

None

1 data table
Table 1

No description provided.


Measurement of differential cross-sections for muon-neutrino electron scattering

The CHARM-II collaboration Vilain, P. ; Wilquet, G. ; Beyer, R. ; et al.
Phys.Lett.B 302 (1993) 351-355, 1993.
Inspire Record 354904 DOI 10.17182/hepdata.16131

We report on a study of the differential cross section d σ /d y for the processes of elastic ν μ - and ν μ - electron scattering. The data on which this analysis is based were recorded between 1987 and 1990 with the CHARM II detector in the wide band neutrino beam at the CERN-SPS. For the first time the shapes of these y -distributions have been determined in a model-independent way. A fit to the data yields for the squares of the neutral coupling constants the ratio g R 2 / g L 2 =0.60 ± 0.19 (stat.) ± 0.09 (syst.).

3 data tables
Table 1

Cross sections in arbitrary units.

Table 2

Cross sections in arbitrary units.

Table 3

Value of SIN2TW obtained from data.


The Reaction gamma + d ---> pi+ pi- + p + n between 570-MeV and 850-MeV and Delta++ Delta- production

The TAGX collaboration Asai, M. ; Endo, I. ; Harada, M. ; et al.
Z.Phys.A 344 (1993) 335-344, 1993.
Inspire Record 365070 DOI 10.17182/hepdata.16557

The reaction γ+d → π++π−+p + n has been measured in a kinematically complete way at incident photon energies from 570 to 850 MeV in steps of 40 MeV. From detailed comparison of measured data with results of event simulations, it is concluded that three different mechanisms, the quasi-free, double-delta and phase space productions, contribute to the reaction. Each of the cross sections corresponding to these mechanisms is determined separately.

2 data tables
Table 1

SYSTEMATIC ERRORS ARE NOT INCLUDED.

Table 2

SYSTEMATIC ERRORS ARE NOT INCLUDED.


Production of fragments with A >= 16 in interactions of 6.3-GeV deuterons with Th, Bi, Au, and Ag

Todorovic, Z. ;
Z.Phys.A 345 (1993) 53-57, 1993.
Inspire Record 361839 DOI 10.17182/hepdata.16563

Polycarbonate track detector Makrofol, sensitive to fragments withA≧16 was used to register products of interactions of 6.3 GeV deuterons with Th, Bi, Au, and Ag. Cross sections for the production of events with one, two and three fragments have been determined and their variation as a function of theZ2/A of the target analyzed. Possible mechanisms were proposed and discussed. Geometric characteristics of binary events were used in order to identify those binary events which resulted from the process of fission. The results were compared with corresponding proton data.

1 data table
Table 1

Cross sections for the production of events with one, two and three fragments have been determined.


Diffractional excitation of Be nucleus by 40-GeV/c pions accompanied by proton emissions into backward hemisphere

Antipov, Yu.M. ; Batarin, V.A. ; Bezzubov, V.A. ; et al.
Phys.Atom.Nucl. 56 (1993) 1241-1250, 1993.
Inspire Record 355325 DOI 10.17182/hepdata.17230

None

2 data tables
Table 1

CHARGED PARTICLES HAVE LARGE ESCAPE ANGLE. DIFRACTIVE SCATTERED PION.

Table 2

CHARGED PARTICLES HAVE LARGE ESCAPE ANGLE. DIFRACTIVE SCATTERED PION.


Anti-D0 meson production in interactions of neutrons with hydrogen, carbon, and aluminum nuclei at 37.5-GeV to 70-GeV

The BIS-2 collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.
Phys.Atom.Nucl. 56 (1993) 1235-1240, 1993.
Inspire Record 364824 DOI 10.17182/hepdata.17203

None

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Inclusive electron nucleus scattering at high momentum transfer

Day, D.B. ; McCarthy, J.S. ; Meziani, Z.E. ; et al.
Phys.Rev.C 48 (1993) 1849-1863, 1993.
Inspire Record 365224 DOI 10.17182/hepdata.6186

The response function of nuclei in the quasielastic region at large momentum transfer (q≤10 fm−1) is measured for a series of nuclei, He4, C12, Al27, Fe56, and Au197, up to large values of the Bjorken scaling variables x<2.5.

23 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Interactions of ultrarelativistic oxygen nuclei in emulsion

El-Nadi, M. ; El-Nagdy, M.S. ; Abd-Alla, A.M. ;
Phys.Rev.C 48 (1993) 870-876, 1993.
Inspire Record 363778 DOI 10.17182/hepdata.4987

The results of the multiplicity distributions of shower, grey, black, and heavily ionizing charged particles from induced16 reactions at 200A GeV are presented. The results are compared with the predictions of the Lund Monte Carlo code fritiof, the multichain model by Ranft, and the Monte Carlo code venus.

6 data tables
Table 1

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

Table 2

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

Table 3

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

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