Data are presen$ed op the inclusive production of 'II-k, p, and p for KS, and protons iicident on nuclear TI*, targets at 100 GeV. The results cover the kinematic range 30.5 P.sTEE ",,eIL;ved for Pt= 0.3 and 0.5 GeV/c. A-dependence of the invariant cross sections exhibits remarkable simplicity, which does not naturally. follow from current models of particle production. The results show that the hypothesis of limiting fragmentation can be extended to include collisions with nuclei.
A negative search using, '& of the eventual MACRO detector has yielded nuclearite flux limits of 1.1&&10 ' cm sr 's ' for 10 ' & ni (0.1 g, and 5.5x 10 ' cm sr 's ' for m)O.l g. We have modified the formula of De Rujula and Glashow for the light yield of nuclearites to include the uv light absorbed and reemitted in the visible region, and proved that the MACRO sensitivity extends almost to the escape velocity of the Earth. Our Aux limit, therefore, can be used to address nuclearites that are possibly trapped in the solar system.
We have analyzed a sample of 1.8 x 10 exp 6 muons with E(mu) greater than about 1.3 TeV collected by the first and second supermodules of the MACRO detector at Gran Sasso during the period 1989 February to 1991 February. We have searched for an excess of muons of celestial origin over cosmic-ray background. Our search for steady sources in solid angle bins of 3.0 x 3.0 deg in the declination range -5 to 90 deg was negative; the upper limit with 95 percent C.L. to the muon flux at midlatitudes is less than about 2 x 10 exp -12/sq cm s. In addition, we have searched for muon excesses modulated by the orbital period of selected X-ray sources, including Cyg X-3, Cyg X-1, Her X-1, 4U 0115 + 63, and 4U 1907 + 09. We have no evidence of any bursting activity from Cyg X-3, during our search period, which includes the radio outburst of 1991 January
The differentlal cross sectlons for the elastlc scattering of ?r+, 9-, K + , K -, p, and on protons have been measured In the t interval -0.04 to -0 75 G~V~ at five momenta: 50, 70, 100, 140, and 175 GeV/c. The t distributions have been parametrized by the quadratic exponential form d o / d t = A exp(Bl tl + ~i t l ' ) and the energy dependence has been described in terms of a slngle-pole Regge model. The pp and K + p dlffractlon peaks are found to shrink with a' -0 20 and -0.15 G~v-', respectively. The jip diffraction peak 1s antishrinklng while ?r t p and K -p are relatively energy-independent. Total elastic cross sections are calculated by mtegrating the differential cross sections. The rapld decline In o,, observed at low energles has stopped and all six reactions approach relatively constant values of o,,. The ratlo of o,,/o,,, approaches a constant value for all six reactions by 100 GeV, consistent with the predictions of the geometric-scaling hypothesis. This ratlo is -0.18 for p p and jip, and -0.12-0.14 for r ' p and K t p . A crossover 1s observed between K f p and K -p scattering at Itl-0.19 GeV2, and between pp and jip at It/-0.11 GeV2. Inversion of the cross sections into impact-parameter space shows that protons are quite transparent to mesons even in head-on collisions. The probability for a meson to pass t h r~u g h a proton head-on wlthout Interaction inelastlcally 1s -20% whlle it is only -6% for an Incident proton or antiproton Finally, the results are compared with various quarkmodel predictions D . S . A Y B E S r t a 1Extracted Proton Septa f-Stops Main Bends Momentum Stop FIG. 1. Diagram of the first stage of the iM6E beam showing the horizontal plane-optics configuration. The momentum and f stops are variable collimators.
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