Two particle correlations between identified meson and baryon trigger particles with 2.5<p(T)(T)(<4.0 GeV/c and lower p) (charged hadrons have been measured at midrapidity by the PHENIX experiment at ...RHIC in p+p,d+Au, and Au+Au collisions at s)(NN) = 200 GeV. In noncentral Au+Au collisions, the probability of finding a hadron near in azimuthal angle to the trigger particles is almost identical for mesons and baryons and significantly higher than in p+p collisions. The associated yields for trigger baryons decrease in the most central collisions, consistent with some baryon production by thermal recombination in addition to hard scattering.
Half-lives of 47(6) ps in {sup 99}Y and 72(7) ps in {sup 100}Y, measured by {beta}-{gamma}-{gamma} coincidences, and intraband {ital M}1/{ital E}2 ratios give {ital M}1 strengths and {ital g} factors ...of the bands {pi}(5/2)(422) in {sup 99}Y, {nu}(3/2)(411) in {sup 99}Sr, and {pi}(5/2)(422){nu}(3/2)(411) in {sup 100}Y. The results are in remarkable agreement with the simple picture of these nuclei as a deformed {sup 98}Sr core plus one or two valence nucleons, thus indicating that the deformation saturates for {ital A}{congruent}100 Sr and Y nuclei. This early'' saturation can be explained in terms of valence Nilsson orbitals.
A high mass trigger for the E864 experiment at the AGS accelerator Hill, J.C.; Huang, H.Z.; Barish, K.N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/1999, Volume:
421, Issue:
3
Journal Article
Peer reviewed
The E864 experiment at the AGS is designed to carry out high sensitivity searches for a variety of possible new particles using relativistic heavy ion Au beams on Pb and Pt targets. In order to reach ...the desired sensitivities, a level-2 “late energy” trigger was built to select events in which a heavy particle is detected in a hadronic calorimeter with deposited energy and time-of-flight from the target exceeding preset values. The physics motivation for the trigger is discussed and and details of its hardware and software design are given. Performance results from recent E864 data taking runs are presented.
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