56 research outputs found
Upper limits for a narrow resonance in the reaction p + p -> K^+ + (Lambda p)
The reaction pp -> K^+ + (Lambda p) has been measured at T_p = 1.953 GeV and
\Theta = 0 deg with a high missing mass resolution in order to study the Lambda
p final state interaction. Narrow S = -1 resonances predicted by bag model
calculations are not visible in the missing mass spectrum. Small structures
observed in a previous experiment are not confirmed. Upper limits for the
production cross section of a narrow resonance are deduced for missing masses
between 2058 and 2105 MeV/c^2.Comment: 8 pages, 5 figure
Identity Provider Deployment Based on Container Technology
Identity Providers are an integral part of Identity Federations. Many different and complex technologies are needed to create an Identity Provider. In order to be able to fully utilize all the benefits of Identity Federations, adequate hardware resources are needed for Identity Provider deployment. Containers address the complexity and resources issues, while enabling faster deployment and keeping the functionalities and core concepts intact at the same time. Containers cannot be perceived as a replacement for virtual machines or bare metal servers, as they are meant to co-exist and have already found a wide range of use cases. This paper proposes using containers for easier implementation of Identity Providers, while lowering resource usage and complexity imposed by deployment requirements
Cross section of the reaction close to threshold
We have measured inclusive data on -meson production in collisions
at COSY J\"ulich close to the hyperon production threshold and determined the
hyperon-nucleon invariant mass spectra. The spectra were decomposed into three
parts: , and . The cross section for the
channel was found to be much smaller than a previous measurement in
that excess energy region. The data together with previous results at higher
energies are compatible with a phase space dependence.Comment: accepted by Phys. lett. B some typos correcte
Detailed comparison of the pp -> \pi^+pn and pp -> \pi^+d reactions at 951 MeV
The positively charged pions produced in proton-proton collisions at a beam
momentum of 1640 MeV/c were measured in the forward direction with a high
resolution magnetic spectrograph. The missing mass distribution shows the bound
state (deuteron) clearly separated from the continuum. Despite the very
good resolution, there is no evidence for any significant production of the
system in the spin-singlet state. However, the cross section ratio is about twice as large as
that predicted from -wave final-state-interaction theory and it is suggested
that this is due to -state effects in the system.Comment: 8 pages, 3 figure
Study of the LiBe reaction 11.3 MeV above threshold
The cross section for the reaction was
measured at an excess energy of 11.28 MeV above threshold by detecting the
recoiling Be nuclei. A dedicated set of focal plane detectors was built for
the magnetic spectrograph Big Karl and was used for identification and four
momentum measurement of the Be. A differential cross section of
for the ground state plus the 1/2 was
measured. The result is compared to model calculations.Comment: accepted by Phys. Rev. C as rapid communicatio
Search for -mesic nuclei in recoil-free transfer reaction
We have studied the reaction at
recoil-free kinematics. An meson possibly produced in this reaction
would be thus almost at rest in the laboratory system and could therefore be
bound with high probability, if nuclear states exist. The decay of such
a state through the resonance would lead to a proton- pair
emitted in opposite directions. For these conditions we find some indication of
such a bound state. An upper limit of 0.5 nb is found.Comment: 3 figure
A precision determination of the mass of the meson
Several processes of meson production in proton-deuteron collisions have been
measured simultaneously using a calibrated magnetic spectrograph. Among these
processes, the meson is seen clearly as a sharp missing--mass peak on a
slowly varying background in the reaction. Knowing
the kinematics of the other reactions with well determined masses, it is
possible to deduce a precise mass for the meson. The final result,
,
is significantly lower than that found by the recent NA48 measurement, though
it is consistent with values obtained in earlier counter experiments.Comment: 10 pages, 6 figures, Fig. 3 change
Cross Section and Tensor Analysing Power of the Reaction Near Threshold
The angular distributions of the unpolarised differential cross section and
tensor analysing power of the reaction have
been measured at an excess energy of 16.6 MeV. The ambiguities in the
partial-wave description of these data are made explicit by using the invariant
amplitude decomposition. This allows the magnitude of the s-wave amplitude to
be extracted and compared with results published at lower energies. In this
way, firmer bounds could be obtained on the scattering length of the system. The results do not, however, unambiguously prove the existence
of a quasi-bound state.Comment: 20 pages, 11 figure
Effect of genotype x environment interaction on grain yield of winter wheat varieties
In the period from 2002 to 2005, grain yield of fifteen wheat varieties grown in Serbia was studied in seven locations. At a triennial cross section, the proportion of genotypic variance was 51.56 %, and genotypic variance x environment 26.34 %. The genotype "cip" had the highest grain yield in ZA, SO, SM, and CA environments, while the genotype "dra" had the highest grain yield in PA and KI environments. Other corner genotypes, such as "zit", "tek", "viz" and "min" did not have high grain yields in any tested environment. The average grain yield distribution in the examined environments was as follows: SO>SM>CA >ZA >PA > KG > KI
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