Richard Nickerson

Abstract:

The spectra in total neutral energy, ETOT0, have been measured in pp, dd and αα collisions at centre-of-mass energy per nucleon pair, sNN, of 31 GeV. The range in ETOT0 covered was 1 to 19 GeV in pp, 18 to 24 GeV in dd and 1 to 34 GeV in αα interactions. The ratio of the αα to the pp spectra rises monotonically from 7 at ETOT0 = 1.5 GeV to 105 at ETOT 0 = 19 GeV. Since ETOT0 is the sum over many particles in the detector, it is directly sensitive to multiple nucleon-nucleon collisions in the interacting α particles. The αα spectrum in the range 8 < ETOT0 < 17 GeV is consistent with being described by a simple model of 4 simultaneous nucleon-nucleon collisions with a cross section about equal to 10% of the observed αα interaction cross section. The spectrum of ETOT0 above 17 GeV is even flatter than this extreme case where four nucleon pairs are interacting. © 1984.

Abstract:

The spectrum dN dET0 (ET0 = neutral transverse energy) has been measured with an electromagnetic calorimeter covering 90% of 2π in azimuth. The measurement, performed in pp collisions at s = 62 GeV, covered the ET0 range from 10 to 30 GeV. Evidence is presented that a large fraction of these events are jet-like, the fraction increasing with ET0. © 1983.

Abstract:

A comparison of pp and pp interactions s=52.7 GeV at the CERN ISR. The quantities compared were the charged and neutral multiplicities, the total neutral transverse energy, Σ ET, up to 12 GeV, and the single π0 inclusive cross section up to pT = 5 GeV c. No significant differences were observed. © 1982.