Azimuthal anisotropy in S+Au reactions at 200 A GeV

Azimuthal correlations of photons produced at mid-rapidity in 200 A GeV S + Au collisions have been studied using a preshower photon multiplicity detector in the WA93 experiment. The Fourier expansion method has been employed to estimate the event plane via the anisotropy of the event as a function of centrality. The event plane correlation technique has been used to determine the true event anisotropy, beyond the anisotropy which arises due to finite multiplicity. The VENUS event generator with rescattering and proper simulation of the detector response can explain only a portion of the observed anisotropy. The residual anisotropy is found to be of the order of 5% for semi-central collisions. This suggests that directed collective flow of the produced particles is present at SPS energies. (C) 1997 Published by Elsevier Science B.V

Nematode constraints to pigeonpea and chickpea in Vidarbha region of Maharashtra in India

Plant parasitic nematodes associated with pigeonpea and chickpea in Akola, Amravati, Buldhana, Yavatmal and Wardha districts in Vidarbha region of Maharashtra, India were observed and recorded. Based on population densities and extent of occurrence, Heterodera cajani and Rotylenchulus reniformis were important on pigeonpea, and Pratylenchus spp. and R. reniformis on chickpea. The root-knot nematodes were not important on these crops in Vidarbha. H. cajani was virtually absent in locations where sesamum, rice, cotton or vegetables were cultivated in the rainy season and chickpea in the post-rainy season. The vegetable-chickpea cropping system greatly favoured build-up of of the lesion (Pratylenchus spp.) and R. reniform nematodes

Azimuthal anisotropy in S + Au reactions at 200 A GeV

Azimuthal correlations of photons produced at mid-rapidity in 200 A GeV S+Au collisions have been studied using a preshower photon multiplicity detector in the WA93 experiment. The Fourier expansion method has been employd to estimate the event plane via the anisotropy of the event as a function of centrality. The event plane correlation technique has been used to determine the true event anisotropy, beyond the anisotropy which arises due to finite multiplicity. The VENUS event generator with rescattering and proper simulation of the detector response can explain only a portion of the observed anisotropy. The residual anisotropy is found to be of the order of 5% for semi-central collisions. This suggests that directed collective flow of the produced particles is present at SPS energies

Soft Photon Production in Central 200 GeV/Nucleon ^{32}S+Au Collisions

Inclusive photons of low transverse momenta have been measured in 200 GeV/nucleon S-32+Au collisions at the CERN SPS. Data were taken in the WA93 experiment using a small acceptance BGO detector with longitudinal segmentation. The results are compared to WA80 measurements for the same system and results from hadron decay calculations, An excess of soft photons over the expectations from neutral meson decays is observed