The production of protons, anti-protons, neutrons, deuterons and tritons in minimum bias p+C interactions is studied using a sample of 385 734 inelastic events obtained with the NA49 detector at the ...CERN SPS at 158 GeV/c beam momentum. The data cover a phase space area ranging from 0 to 1.9 GeV/c in transverse momentum and in Feynman
x
from −0.8 to 0.95 for protons, from −0.2 to 0.3 for anti-protons and from 0.1 to 0.95 for neutrons. Existing data in the far backward hemisphere are used to extend the coverage for protons and light nuclear fragments into the region of intra-nuclear cascading. The use of corresponding data sets obtained in hadron–proton collisions with the same detector allows for the detailed analysis and model-independent separation of the three principle components of hadronization in p+C interactions, namely projectile fragmentation, target fragmentation of participant nucleons and intra-nuclear cascading.
New data on the production of charged kaons in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c ...beam momentum. The kaons are identified by energy loss in a large TPC tracking system. Inclusive invariant cross sections are obtained in intervals from 0 to 1.7 GeV/c in transverse momentum and from 0 to 0.5 in Feynman x. Using these data as a reference, a new evaluation of the energy dependence of kaon production, including neutral kaons, is conducted over a range from 3 GeV to
collider energies.
Recent data on proton and pion production in p+C interactions from the CERN PS and SPS accelerators are used in conjunction with other available data sets to perform a comprehensive survey of ...backward hadronic cross sections. This survey covers the complete backward hemisphere in the range of lab angles from 10 to 180 degrees, from 0.2 to 1.4 GeV/
c
in lab momentum and from 1 to 400 GeV/
c
in projectile momentum. Using the constraints of continuity and smoothness of the angular, momentum and energy dependences a consistent description of the inclusive cross sections is established which allows the control of the internal consistency of the nineteen available data sets.
The production of charged pions in minimum bias p+C interactions is studied using a sample of 377000 inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum. The ...data cover a phase space area ranging from 0 to 1.8 GeV/c in transverse momentum and from -0.1 to 0.5 in Feynman xF. Inclusive invariant cross sections are given on a grid of 270 bins per charge, thus offering for the first time a dense coverage of the projectile hemisphere and of the cross-over region into the target fragmentation zone.
The new data on pion production in p+C interactions from the NA49 experiment at the CERN SPS are used for a detailed study of hadronization in the collision of protons with light nuclei. The ...comparison to the extensive set of data from p+p collisions obtained with the same detector allows for the separation and extraction of the projectile and target contributions to the pion yield both in longitudinal and in transverse momentum.
•Light water reactor in support of fast reactor technology development.•Comparison of fast spectrum tails of fast reactors and light water reactor tail in large dry channel.•Proposal of sensitive ...spectral indices for fast spectrum comparison in different systems.
A design verification by basic neutronic experiments is an integral part of maturing a reactor concept. Before building a demonstrator unit, it is useful to design and carry out verification and validation work concerning the modeling tools as well as nuclear data in a mock-up simulating the environment in an advanced reactor. The focus of this paper is to show how the experimental research light water reactor LR-0 is used in development work connected to a wide range of advanced reactor concepts: High Temperature Gas Cooled Reactor (HTGR), Molten Salt Reactor (MSR), Molten Salt Fast Reactor (MSFR) Lead Cooled Fast Reactor (LFR), and Gas Cooled Fast Reactor (GFR). Results show that a large channel in a light water research reactor with appropriate neutron filter can be used for studies of basic reactor physics in the fast part of the neutron spectrum of some more advanced systems.
New data on the production of protons, anti-protons and neutrons in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the ...CERN SPS at 158 GeV/c beam momentum. The charged baryons are identified by energy loss measurement in a large TPC tracking system. Neutrons are detected in a forward hadronic calorimeter. Inclusive invariant cross sections are obtained in intervals from 0 to 1.9 GeV/c (0 to 1.5 GeV/c) in transverse momentum and from −0.05 to 0.95 (−0.05 to 0.4) in Feynman
x
for protons (anti-protons), respectively.
p
T
integrated neutron cross sections are given in the interval from 0.1 to 0.9 in Feynman
x
. The data are compared to a wide sample of existing results in the SPS and ISR energy ranges as well as to proton and neutron measurements from HERA and RHIC.
Production of d, t, and 3He nuclei in central Pb + Pb interactions was studied at five collision energies ($\sqrt{s}$$_ {NN}$= 6.3, 7.6, 8.8, 12.3, and 17.3 GeV) with the NA49 detector at the CERN ...Super Proton Synchrotron.Transverse momentum spectra, rapidity distributions, and particle ratios were measured. Yields are compared to predictions of statistical models. Phase-space distributions of light nuclei are discussed and compared to those of protons in the context of a coalescence approach. Finally, the coalescence parameters B2 and B3, as well as coalescence radii for d and 3He were determined as a function of transverse mass at all energies.
New data on charged pion production in
PbPb interactions are measured by the NA49 experiment and compared to
NN interactions. Different phenomena are isolated. It is argued that salient features of ...pion production in nuclear interactions can be understood as a result of
NN dynamics and of other non–exotic phenomena.
AbstractIt is demonstrated that many aspects of nuclear collisions, as for instance the evolution of π+/π– and K/π ratios with xF and \(\sqrt{s}\), are influenced by isospin effects already present ...in elementary nucleon–nucleon collisions.
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