3,277 research outputs found
Exotic particles and nuclei
Get PDFLight nuclei, antinuclei and hypernuclei constitute a laboratory to study the mechanisms of formation of bound states in proton-proton and nucleus-nucleus collisions over a broad range of collision energies, providing insights into the nuclear structure as well as into the strong interaction. In this contribution, a selection of the experimental results and latest developments presented at the Quark Matter 2023 conference is reviewed
Are there hadronic bound states above the QCD transition temperature?
Get PDFRecent lattice QCD calculations, at physical pion masses and small lattice spacings that approach the continuum limit, have revealed that non-diagonal quark correlators above the critical temperature are finite up to about 2 Tc. Since the transition from hadronic to free partonic degrees of freedom is merely an analytic cross-over, it is likely that, in the temperature regime between 1-2 Tc, quark and gluon quasiparticles and pre-hadronic bound states can coexist. The correlator values, in comparison to PNJL model calculations beyond mean-field, indicate that at least part of the mixed phase resides in color-neutral bound states. A similar effect was postulated for the in-medium fragmentation process, i.e. for partons which do not thermalize with the system and thus constitute the non-equilibrium component of the particle emission spectrum from a deconfined plasma phase. Here, for the first time we investigate the likelihood of forming bound states also in the equilibrated, parton dominated phase above Tc which is described by lattice QCD. 1 a
STUDIES OF NEUTRON-ARGON INTERACTIONS IN MINI-CAPTAIN
No full textThe Deep Underground Neutrino Experiment (DUNE) will use a large underground liquid argon time projection chamber (LArTPC) to study neutrino oscillations, search for proton decay, and observe supernova neutrinos, should a supernova occur. There is a currently a rich program of R&D on LArTPCs in preparation for DUNE. The Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrino (CAPTAIN) program is one of these R&D efforts. This thesis describes studies on the neutron interactions in liquid argon using the mini-CAPTAIN LArTPC at a neutron beam facility at Los Alamos National Laboratory. Studies of neutron signatures can help to improve neutrino energy reconstruction in DUNE, important for the neutrino oscillation measurements. In addition, neutron data can be used to measure cross sections of the neutron background to supernova burst neutrinos. This work represents the first measurement of neutron interactions in a liquid argon TPC in the energy range above 20 MeV.Physics, Department o
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Distributed drift chamber design for rare particle detection in relativistic heavy ion collisions
Get PDFThis 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 ionsper second
Strange Particle Production Mechanisms in Proton-Proton Collisions at RHIC
No full textWe present data on strange particle production in elementary proton-proton collisions at RHIC energies. Comparison to leading order and next-to-leading order (NLO) calculations shows that the fragmentation process is flavor dependent and that higherorder corrections are needed to describe all spectra, in particular at these collision energies, which are modest compared to the Tevatron energies. A model (EPOS) which takes into account multiple scattering between projectile constituents seems to describe the data best
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TWO DIMENSIONAL STUDIES OF DYNAMICS OF ELECTRON CLOUDS IN SILICON DRIFT DETECTORS.
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Baryon spectra in the low p sub T -region
No full textThe measurement of transverse momentum spectra for identified particle species in central collisions of relativistic heavy ions is of great interest for the determination of parameters which describe the phase of high density matter presumably formed in these collisions. If thermal equilibrium is reached in a heavy ion collision, then the transverse momentum distribution of the emitted particles is related to the freeze-out temperature T of the particle species under consideration. For a single source Boltzmann-distribution T would be obtained by fitting a distribution of the form A m{sub T} exp({minus}m{sub T}/T) to the measured transverse momentum spectrum, where m{sub T}={radical}m{sub 0}{sup 2} + p{sub T}{sup 2}. An impressive sample of p{sub T}-spectra for different identified particles was recently measured at the AGS by the E802-group. The distributions of invariant cross sections for all measured particle species are in agreement with a Boltzmann-distribution as well as with an exponential distribution in the transverse mass m{sub T}. More interesting features of relativistic heavy ion collisions are possibly hidden in the very low p{sub T}-range. The measurements at 200 GeV/u at CERN revealed for {pi}-spectra a deviation from the exponential slope, the so called low p{sub T}-enhancement,' below p{sub T} = 200 MeV/c. Many speculations about the origin of this phenomenon arose from these measurements down to very low values of p{sub T}. In this context it is therefore very interesting to measure spectra of nucleons in the same low p{sub T} region and search for similar enhancements. This paper discusses the search for these enhancements
Korrelation zwischen Transfer und Fusion in Schwerionenkollisionen an der Coulombbarriere
No full textOnTEAM metadata: GDSID: DOC-2008-Aug-16; Attribute ID: LIBRARY-report-2008-027
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