J. P. Bocquet
F. Malek
H. Nifenecker
M. Rey-Campagnolle
M. Maurel
E. Monnand
P. Perrin
C. Ristori
G. Ericsson
T. Johansson
G. Tibell
S. Polikanov
T. Krogulski
J. Mougey
Antiproton induced fission probabilities of U 238, Bi 209, Pb 208 and Au 177 are reported together with the mass distribution of the fission fragments in the U 238 and Bi 209 cases. The charged particles multiplicities observed in coincidence with fission have, also, been measured for U and Bi are presented
J. P. Bocquet
R. Brissot
H. R. Faust
M. Fowler
J. Wilhelmy
M. Asghar
M. Djebara
The mass and nuclear charge distributions of fission fragments from 229Th( nth, f) have been measured at several kinetic energies with the mass spectrometer Lohengrin (ILL-Grenoble). The average proton e-o effect, which reaches 41%, induces large oscillations in the parameters of the isotopic charge distribution. A comparison of the data from different fissile nuclei shows the importance of the last stage of the process for intrinsic excitations
A multi-workstation for use in a work area of a garage having a vertically oriented pole with an upper end and a lower end and a light fixture mounted between the upper end and the lower end of the vertically oriented pole. The light fixture is capable of sliding up and down along the pole, rotating about an axis that is perpendicular to the axis of the pole, moving horizontally toward and away from the pole, and rotating about an axis that is perpendicular to the axis of the pole. Locking means is provided to lock the light fixture at a desired height and angle relative to the pole and mounting means is provided to hold the pole in a vertical position.
Significant enhancements of J/psi production at very low transverse momenta were recently observed by the ALICE and STAR collaborations in peripheral hadronic A+A collisions. The anomalous excess points to coherent photon-nucleus interactions in violent hadronic heavy-ion collisions, which were conventionally studied only in ultra-peripheral collisions. Assuming that the coherent photoproduction is the underlying mechanism responsible for the excess observed in peripheral A+A collisions, its contribution in p+p collisions with nuclear overlap, i.e. nonsingle-diffractive collisions, is of particular interest. In this paper, we perform a calculation of exclusive J/psi photoproduction in non-single-diffractive p+p collisions at the RHIC and LHC energies based on the pQCD motivated parametrization using the world-wide experimental data, which could be further employed to improve the precision of the phenomenological calculations for photoproduction in A+A collisions. The differential rapidity and transverse momentum distributions of J/psi from photoproduction are presented. In comparison with the J/psi production from hadronic interactions, we find that the contribution of photoproduction is negligible.
Let p(1),..., p(n) be positive real numbers. It is well known that for every r < 0 the matrix [(p(i) + p(j))(r)] is positive definite. Our main theorem gives a count of the number of positive and negative eigenvalues of this matrix when r > 0. Connections with some other matrices that arise in Loewner's theory of operator monotone functions and in the theory of spline interpolation are discussed.
Acar, Tuncer
Cappelletti Montano, Mirella
Garrancho, Pedro
Leonessa, Vita
This survey is devoted to a series of investigations developed in the last fifteen years, starting from the introduction of a sequence of positive linear operators which modify the classical Bernstein operators in order to reproduce constant functions and x2 on [0,1]. Nowadays, these operators are known as King operators, in honor of J. P. King who defined them, and they have been a source of inspiration for many scholars. In this paper we try to take stock of the situation and highlight the state of the art, hoping that this will be a useful tool for all people who intend to extend King's approach to some new contents within Approximation Theory. In particular, we recall the main results concerning certain King-type modifications of two well known sequences of positive linear operators, the Bernstein operators and the Szasz-Mirakyan operators.