59 research outputs found
Improved Nearside-Farside Decomposition of Elastic Scattering Amplitudes
A simple technique is described, that provides improved nearside-farside (NF)
decompositions of elastic scattering amplitudes. The technique, involving the
resummation of a Legendre partial wave series, reduces the importance of
unphysical contributions to NF subamplitudes, which can arise in more
conventional NF decompositions. Applications are made to a strong absorption
model and to a O + C optical potential at
MeV.Comment: 5 pages, 2 figure
Refractive elastic scattering of carbon and oxygen nuclei: The mean field analysis and Airy structures
The experimental data on the OC and OC elastic
scatterings and their optical model analysis are presented. Detailed and
complete elastic angular distributions have been measured at the Strasbourg
Vivitron accelerator at several energies covering the energy range between 5
and 10 MeV per nucleon. The elastic scattering angular distributions show the
usual diffraction pattern and also, at larger angles, refractive effects in the
form of nuclear rainbow and associated Airy structures. The optical model
analysis unambiguously shows the evolution of the refractive scattering
pattern. The observed structure, namely the Airy minima, can be consistently
described by a nucleus-nucleus potential with a deep real part and a weakly
absorptive imaginary part. The difference in absorption in the two systems is
explained by an increased imaginary (mostly surface) part of the potential in
the OC system. The relation between the obtained potentials and
those reported for the symmetrical OO and CC
systems is drawn.Comment: 10 pages, 9 figures, Phys. rev. C in pres
Airy-like patterns in heavy ion elastic scattering
A semiclassical analysis of an optical potential cross section is presented.
The cross section considered is characterized by the appearance of an Airy-like
pattern. This pattern is similar to that which is present in many cross
sections, which fit the recent measurements of light heavy ion elastic
scattering, and is considered as a manifestation of a rainbow phenomenon. The
semiclassical analysis shows that, in the case considered, the oscillations
arise from the interference between the contributions from two different terms
of a multi-reflection expansion of the scattering function, and, therefore,
cannot be associated with the rainbow phenomenon.Comment: 10 pages, 5 figure
INSTRUMENTS OF LEVELING OF THE ECONOMIC DEVELOPMENT OF THE SVERDLOVSK OBLAST TERRITORIES: THEORY AND PRACTICE
The problem of leveling of the economic development of territories has become more important on the inter-regional level as well as in the region, in Sverdlovsk Oblast, in particular. The article considers the following procedures of evaluation of municipalitiesâ development that are used in the Sverdlovsk Oblast: the procedure of rating evaluation of municipalities concerning their level of economic potential and dynamics of development; the procedure of evaluation of municipalitiesâ competitive capacity and the procedure of evaluation of the level of life of the population which the Oblast is trying to use at present. Besides, the article discusses in details instruments used in leveling of municipalitiesâ development while performing the reform of local government in the Russian Federation
Do exotic alpha-cluster states in 12 C show signatures of alpha-condensate structure? Analysis of recent data on the a -particle inelastic scattering
The diffraction model, DWBA and the Coupled Reaction Channels analysis of the novel data of α +
12C elastic and inelastic (to the states
4.44, 7.65 and 9.64 MeV) scattering in full angular range at an incident energy of 110 MeV is presented. The diffraction radii for the ground
and the first excited (4.44 MeV) states are found to be equal. The diffraction radii for the 7.65 and 9.64 MeV states are enhanced by 0.5â0.8
fm. This result shows that the radius of the Hoyleâs 0+
2
, 7.65 MeV state in 12C is larger by a factor of ⌠1.2 - 1.3 than that of the ground state.
It is demonstrated that the direct transfer of 8Be dominates at large angles in all four reactions reported here and that the relative angular
momentum L=0 corresponding to the transfer of 8Be in its ground state 0+ has predominant probability for the 0
+
2
state in comparison with
the ground state of 12C. Evidence of existence of some features of alpha-condensed structure of the Hoyleâs 0+
2
state in 12C was obtained,
particularly, its enhanced radius and large contribution of alpha-particle configuration with L =
Do exotic alpha-cluster states in 12 C show signatures of alpha-condensate structure? Analysis of recent data on the a -particle inelastic scattering
The diffraction model, DWBA and the Coupled Reaction Channels analysis of the novel data of α +
12C elastic and inelastic (to the states
4.44, 7.65 and 9.64 MeV) scattering in full angular range at an incident energy of 110 MeV is presented. The diffraction radii for the ground
and the first excited (4.44 MeV) states are found to be equal. The diffraction radii for the 7.65 and 9.64 MeV states are enhanced by 0.5â0.8
fm. This result shows that the radius of the Hoyleâs 0+
2
, 7.65 MeV state in 12C is larger by a factor of ⌠1.2 - 1.3 than that of the ground state.
It is demonstrated that the direct transfer of 8Be dominates at large angles in all four reactions reported here and that the relative angular
momentum L=0 corresponding to the transfer of 8Be in its ground state 0+ has predominant probability for the 0
+
2
state in comparison with
the ground state of 12C. Evidence of existence of some features of alpha-condensed structure of the Hoyleâs 0+
2
state in 12C was obtained,
particularly, its enhanced radius and large contribution of alpha-particle configuration with L =
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