[en] At the beginning of the design and construction of the STAR detector, the collaboration assigned a team of physicists and engineers the responsibility of coordinating the construction of the detector. This group managed the general space assignments for each sub-system and coordinated the assembly and planning for the detector. Furthermore, as this group was the only STAR group with the responsibility of looking at the system as a whole, the collaboration assigned it several tasks that spanned the different sub-detectors. These items included grounding, rack layout, cable distribution, electrical, power and water, and safety systems. This paper describes these systems and their performance

[en] Short communication

[en] Interaction cross sections (σ₁) and transverse momentum P_t distributions of ⁹Li fragments in ¹¹Li reactions were measured using p and d targets at 800A MeV, and Be and C targets at 400A MeV. The density distribution of the ¹¹Li nucleus has been determined for the first time from these σ₁'s. It is confirmed that only a distribution with a long tail (halo) consistently reproduces the observed data. From a combined analysis of P_t distributions of ⁹Li and of neutrons, the momentum correlation of the two halo neutrons was extracted. It suggests that these neutrons have a strong tendency to move in the same direction. (orig.)

[en] We propose a large-area, cost-effective Muon Telescope Detector (MTD) at mid-rapidity for the Solenoidal Tracker at RHIC (STAR) and for the next generation of detectors at a possible electron-ion collider. We utilize large Multi-gap Resistive Plate Chambers with long readout strips (long-MRPC) in the detector design. The results from cosmic ray and beam tests show the intrinsic timing and spatial resolution for a long-MRPC are 60-70 ps and ∼ 1 cm, respectively. The performance of the prototype muon telescope detector at STAR indicates that muon identification at a transverse momentum of a few GeV/c can be achieved by combining information from track matching with the MTD, ionization energy loss in the Time Projection Chamber, and time-of-flight measurements. A primary muon over secondary muon ratio of better than 1/3 can be achieved. This provides a promising device for future quarkonium programs and primordial dilepton measurements at RHIC. Simulations of the muon efficiency, the signal-to-background ratio of J/ψ, the separation of Υ 1S from 2S+3S states, and the electron-muon correlation from charm pair production in the RHIC environment are presented.

[en] The first computer simulations to optimize the Silicon Vertex Tracker (SVT) designed for the STAR experiment at RHIC are presented

[en] Presented here is a brief summary of the setup, analysis, and results of a pion correlation experiment performed using the Heavy Ion Spectrometer System (HISS) at the Lawrence Berkeley Laboratory BEVALAC. The beams and targets used were 1.8 GeV/nucleon Argon on KCl and Lanthanum targets, and 1.2 GeV/nucleon Xenon on a Lanthanum target. (orig.)

[en] A new prototype of a Long-Strip Multi-Gap Resistive Plate Chamber (LMRPC) for the STAR Muon Telescope Detector (MTD) at RHIC has been developed. This prototype has an active area of 52x90 cm² and consists of six 250 μm wide gaps. Each detector has 12 strips, read-out at both ends, which are each 3.8 cm wide and 90 cm long with 0.6 cm intervals. In cosmic-ray tests, the efficiency was larger than 95% and the time resolution was ∼75 ps for the 94% Freon, 5% iso-butane, and 1% SF₆ gas mixture. There was good uniformity in the performance across the different strips. The module was also tested in a proton beam at IHEP in Beijing. The efficiency was close to 100% and the best timing resolution achieved was 55 ps for the 90% Freon, 5% iso-butane, and 5% SF₆ gas mixture. Trigger scans along and across the strip direction were also performed.

[en] The interaction cross sections (σ_I's) with ¹⁵B, ⁹C, ¹⁰C, ¹⁵C, ¹³N, ¹³O, ¹⁴O and ¹⁵O beams have been measured at energies of around 730A.MeV. The effective root-mean-square (RMS) radii of the nucleon distribution of these nuclei have been deduced using a Glauber-model calculation. The global isotope and isospin dependences of the radii are shown in the p-shell region. The σ_I's are also compared with those obtained at intermediate energies in the region. Furthermore, we calculated the Coulomb-energy differences of the mirror pairs deduced from the RMS charge radii and compared them with those obtained from the mass for some mirror pairs. From the above systematics, an anomalous nuclear structure (a halo and/or a skin) is suggested for ¹⁴B and ¹⁵C, and the occurrence of an s-d inversion is emphasized for the ¹⁷Ne-¹⁷N mirror pair. (orig.)

[en] The STAR endcap electromagnetic calorimeter will provide full azimuthal coverage for high-p_T photons, electrons and electromagnetically decaying mesons over the pseudorapidity range 1.086≤η≤2.00. It includes a scintillating-strip shower-maximum detector to provide π⁰/γ discrimination and preshower and postshower layers to aid in distinguishing between electrons and charged hadrons. The triggering capabilities and coverage it offers are crucial for much of the spin physics program to be carried out in polarized proton-proton collisions

[en] This report describes a multi-plane drift chamber that was designed and constructed to function as a topological detector for the BNL AGSE896 rare particle experiment. The chamber was optimized for good spatial resolution, two track separation, and a high uniform efficiency while operating in a 1.6 Tesla magnetic field and subjected to long term exposure from a 11.6 GeV/nucleon beam of 10**6 Au ions per second