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Recent results from the NA35 Collaboration are presented for the reactions of 60 and 200 GeV/nucleon p and 16 O, and 200 GeV/nucleon 32 S with various targets ranging from S to Au. Midrapidity transverse energy distributions and forward energy flow, p⊥ spectra and rapidity distributions of hadrons are presented. Two-pion interferometry results are discussed. Neutral strange particle yields and p⊥ distributions are presented. Conclusions are drawn from the experimental results.

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CHARGE NUMBER DEPENDENCE OF PI+ PRODUCTION FROM NUCLEI BY 200-MEV ELECTRON

Shoda, K. ; Toyama, S. ; Torikoshi, M. ; et al.

Nucl.Phys.A 486 (1988) 512-525, 1988.

Inspire Record 270173 DOI 10.17182/hepdata.37011

Photopion energy distributions have been measured on 7 Li , 28 Si , 51 V and 93 Nb at θ π = 90° with 200 MeV electron. The logarithmic plot of the distributions shows a break at around 10 MeV of the residual energy. This is not explained by the quasi-free π + production. The (e, π + ) cross sections at θ π = 90° deduced by integrating the energy distribution. The result can be approximated by σ 0 Z 2 3 , where σ 0 is 0.13 times the elementary cross section of H(e, π + ) at θ π = 90°. The quasi-free π + production calculated by the Fermi-gas model with Pauli exclusion principle approximately reproduces the relative dependence on the charge number but its absolute value is about ten times as large as the experimental result. The present result for the charged photopion cross section in the threshold region is in contrast to the case in the Δ-resonance region where the cross section of π + + π − photoproduction is expressed by A 2 3 times the elementary cross sections.

1 data table

Table 1

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Electroproduction of Negative Pions on $^{15}$N Leading to the Ground State of $^{15}$O

Liesenfeld, A. ; Alberti, B. ; Eyl, D. ; et al.

Nucl.Phys.A 485 (1988) 580-588, 1988.

Inspire Record 270242 DOI 10.17182/hepdata.37039

An angular distribution of negative pions produced on 15 N, leading to the ground state of 15 O, has been measured via the (e, π − )-reaction at E e ≈ 170 MeV. Using virtual photon theory, single-differential cross sections are extracted from the measured double-differential cross sections. The measured data is in good agreement with theoretical calculations in the DWIA model. A clear signature of nuclear EO excitation is found in contrast to previous experiments in a similar reaction on 13 C.

1 data table

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DIFFRACTIVE DISSOCIATION OF NEUTRONS IN LAMBDA0 K0 ON HYDROGEN AT ABOUT 40-GeV ENERGY

Determination of the fraction of multiple processes in d d interactions at 12-GeV/c.

SPECTRA OF PROTONS FLYING OUT AT BIG ANGLES IN D P ---> P X REACTION AT 3.3-GEV/C. (IN RUSSIAN)

THE CROSS-SECTIONS OF PION PRODUCTION AT AN ANGLE OF 159-degrees FOR INTERACTIONS OF PROTONS HAVING AN ENERGY FROM 15-GeV TO 61-GeV CARBON NUCLEI

Spectra of protons and pi- mesons in C C interactions at 4.2-GeV/c per nucleon.

PRODUCTION OF NEUTRAL STRANGE PARTICLES IN ANTI-P HE-4 ANNIHILATION AT 600-MEV/C. (IN RUSSIAN)

ESTIMATING THE RESONANT PARAMETERS OF A DELTA (33) ISOBAR BASED ON DATA ABOUT PHOTOPRODUCTION OF PI0 MESONS IN A C-12 NUCLEUS

Recent Results From the Na35 Collaboration at {CERN}

CHARGE NUMBER DEPENDENCE OF PI+ PRODUCTION FROM NUCLEI BY 200-MEV ELECTRON

Electroproduction of Negative Pions on $^{15}$N Leading to the Ground State of $^{15}$O