Medium-energy pion scattering and the alpha -cluster description of<sup>12</sup>C

Bano, Nausheen; Ahmad, I.

doi:10.1088/0305-4616/5/1/006

Cited by 11 publications

(10 citation statements)

References 22 publications

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“…In Fig. 6c, one finds that, for example, for the π + 28 Si scattering (red boxes) at energies of about 170 MeV near the 33-resonance maximum, the "slope" parameter β av in the amplitude (4) of pion scattering on the bound nuclear nucleon is about 1.6 times smaller than that for the pion scattering on a "free" nucleon [30,31]. If for the quantitative estimation one takes the πN interaction potential as V (r) = V 0 exp(−r 2 /2β), then one obtains the Born scattering amplitude in the form of ∼ exp(−βq 2 /2) as in eq.…”

Section: Results Of Calculationsmentioning

confidence: 96%

“…6a one can see the total πN cross sections σ av obtained from analysis of the pion scattering data of π + 28 Si (red squares) and π + 40 Ca (green triangles). They repeat the general behavior of the πp cross section (green circles) in the (33)-resonance energy region for the pion scattering The energy dependences of the fitted parameters σav, αav, βav of the "in-medium" πN amplitude (4), obtained from the data on π + 28 Si ( red) and on π + 40 Ca (⊲ blue), are compared with those from pion scattering on "free" nucleons: (a) experimental data (• green) are from [28] , (b) -from [29] (• green) , (c) -from [30] (• and • green) and from [31](♦ black).…”

Section: Results Of Calculationsmentioning

confidence: 99%

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Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

et al. 2021

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Elastic cross sections are calculated and compared with the data on π ± scattering on 28 Si, 40 Ca, 58 Ni, 208 Pb nuclei in the energy range from 130 to 290 MeV. To this end, both the folding optical potential (OP) and the local modified Kisslinger-type OP were calculated, and then the πA cross sections were obtained by solving the Klein-Gordon equation to account for the relativization and distortion wave effects. In the folding OPs, the parameters of the elementary πN amplitude were fitted when describing the πA scattering data, and thus the essential in-medium effect on the parameters of the πN amplitude was established since the pion is scattered not on a free but on a bound nuclear nucleon. Fairly good agreement with experimental data was obtained for both models of optical potentials and their forms turn out to be in coincidence in the region of their surfaces.

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Section: Results Of Calculationsmentioning

confidence: 96%

Section: Results Of Calculationsmentioning

confidence: 99%

Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

et al. 2021

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“…Fluorescence spectrum of NBDC 6 in PBS solution is plotted in the Figure 3 in the absence and in the presence of hypericin. It should be noted, that hypericin in the aqueous solutions quickly forms non-fluorescent aggregates [27,28]. Significant decrease of NBDC 6 fluorescence intensity can be observed after hypericin addition.…”

Section: Resultsmentioning

confidence: 99%

Estimation of PKCδ autophosphorylation in U87 MG glioma cells: combination of experimental, conceptual and numerical approaches

Misuth

Joniová

Belej

et al. 2016

Journal of Biophotonics

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Golgi apparatus (GA) is a center for lipid metabolism and the final target of ceramide pathway, which may result in apoptosis. In this work localization of highly hydrophobic hypericin is followed by time-resolved imaging of NBDC (fluorescent ceramide) in U87 MG glioma cells. Decrease of NBDC fluorescence lifetimes in cells indicates that hypericin can also follow this pathway. It is known that both, ceramide and hypericin can significantly influence protein kinase C (PKC) activity. Western blotting analysis shows increase of PKCδ autophosphorylation at Ser645 (p(S645)PKCδ) in glioma cells incubated with 500 nM hypericin and confocal-fluorescence microscopy distinguishes p(S645)PKCδ localization between GA related compartments and nucleus. Experimental and numerical methods are combined to study p(S645)PKCδ in U87 MG cell line. Image processing based on conceptual qualitative description is combined with numerical treatment via simple exponential saturation model which describes redistribution of p(S645)PKCδ between nucleus and GA related compartments after hypericin administration. These results suggest, that numerical methods can significantly improve quantification of biomacromolecules (p(S645)PKCδ) directly from the fluorescence images and such obtained outputs are complementary if not equal to typical used methods in biology.

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“…Figure 5 shows the averaged values X = (X π + + X π − )/2 where X means one of the parameters σ , α, β . The comparisons are done of behaviors of the averaged "free" π ± N-scattering parameters [14,15] with the best-fit "in-medium" parameters (we mark them by "eff") in their dependency on the collision energy T lab .…”

Section: Resultsmentioning

confidence: 99%

“…Study of in-medium effect on the pion-nucleon amplitude from analysis of pion-nucleus ... V.K.Lukyanov Figure 5: (Color online) Light gray (yellow): "free" π ± N-scattering parameters from [14] and [15]. Dark gray (blue): the best fit values X e f f = (X π + + X π − )/2; X = σ , α, β .…”

Section: Pos(baldin Ishepp Xxi)021mentioning

confidence: 99%

Analysis of experimental data on the pion scattering on nuclei within the microscopic optical potential and in-medium effect on the pion-nucleon amplitude of scattering

Lukyanov¹

2013

Proceedings of XXI International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXI)

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Analysis is performed of calculations of the elastic scattering differential cross sections of pions on the 28 Si, 40 Ca, 58 Ni and 208 Pb nuclei at energies from 130 to 290 MeV basing on the microscopic optical potential (OP) constructed as an optical limit of a Glauber theory. Such an OP is defined by the corresponding target nucleus density distribution and by the pion-nucleon πN amplitude of scattering. The pion-nucleus cross sections are calculated by numerical solving the corresponding relativistic wave equation. The three (say, "in-medium") parameters of the πN amplitude, the total cross section, the ratio of real to imaginary part of the forward πN amplitude, and the slope parameter, were obtained by fitting the calculated cross sections to the respective experimental data. A difference is discussed between the best-fit "in-medium" parameters and the "free" parameters of the πN scattering amplitudes known from the experimental data on scattering of pions on free nucleons.

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Medium-energy pion scattering and the alpha -cluster description of¹²C

Cited by 11 publications

References 22 publications

Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

Estimation of PKCδ autophosphorylation in U87 MG glioma cells: combination of experimental, conceptual and numerical approaches

Analysis of experimental data on the pion scattering on nuclei within the microscopic optical potential and in-medium effect on the pion-nucleon amplitude of scattering

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Medium-energy pion scattering and the alpha -cluster description of12C

Cited by 11 publications

References 22 publications

Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

Analysis of the pion-nucleus scattering within the folding and the Kisslinger type potentials

Estimation of PKCδ autophosphorylation in U87 MG glioma cells: combination of experimental, conceptual and numerical approaches

Analysis of experimental data on the pion scattering on nuclei within the microscopic optical potential and in-medium effect on the pion-nucleon amplitude of scattering

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Medium-energy pion scattering and the alpha -cluster description of¹²C