Results 251 to 260 of about 227,336 (268)
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Pion Softening and Pion Condensation
Physics of Atomic Nuclei, 2020In this paper after a historical introduction I discuss ideas of a pion softening and pion condensation in a dense nuclear matter, in particular in neutron stars, and a conjecture about a feasible existence of abnormal nuclei.
D. N. Voskresensky, D. N. Voskresensky
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Pion Production and the Pion-Pion Interaction
Physical Review Letters, 1959The cross sections for pi /sup -/ + p yields pi /sup -/ + pi /sup +/ + n at inc ident energies between 260 and 430 have been measured in a previous expeniment. A theoretical interpretation of these results is presented. An attempt is made to fit the results by using a direct pion-pion interaction.
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On the photoproduction of pions on pions
Il Nuovo Cimento, 1962An integral equation for the amplitude of the photoproduction of pions on pions is derived from unitarity and Mandelstam representation. An iteration technique for obtaining approximate solutions is adopted and illustrated by assuming a sharp pion-pion resonance in theP ...
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Pion-pion scattering in the two-pion exchange approximation [PDF]
Il Nuovo Cimento, 1962 The results of a calculation of pion-pion scattering in two-pion exchange approximation are presented. IfS andP-waves are subtracted and iftmax≲16 andsmax≲1 600 the equations converge. It is found that there is little alteration in the low-energy solutions obtained in an earlier calculation using Legendre polynomial expansions to determine the left cut.
B. H. Bransden, J. W. Moffat
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Pion Production in Pion-Nucleon Collisions and the Pion-Pion Interaction
Physical Review, 1962Momentum distributions of the pions of all charge states produced in the interaction of 960-Mev pi /sup -/ mesons with protons are calculated assuming a primary pi pi interaction followed by a pi -N interaction with excitation of the (3,3) isobar state of the nucleon. Predicted spectra are in reasonable agreement with experimental data when the pi - pi
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The S Wave Pion-Pion Interaction
Proceedings of the Physical Society, 1961The pion-pion interaction has been studied with an explicit appeal to the standard quantum field theory. Lowest order perturbation theory calculations indicate that the usual renormalization procedure may imply an indefinite quantization metric. An alternative procedure, using a regulator cut-off near the nucleon mass, is therefore adopted, and on this
G R Allcock, A N Kamal
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Il Nuovo Cimento A, 1969
Angular distributions for π−π− scattering have been studied using the reaction π−p→π−π−π+p at 2.26 GeV/c. TheT=2D-wave phase shift is discussed.
B.C. Harms +8 more
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Angular distributions for π−π− scattering have been studied using the reaction π−p→π−π−π+p at 2.26 GeV/c. TheT=2D-wave phase shift is discussed.
B.C. Harms +8 more
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Pion-Pion Interaction in Electromagnetic Processes
Physical Review, 1960The correction to the photon propagator due to the emission of a virtual pion pair is evaluated considering the effect of the strong pion-pion interaction in the J = 1, T = 1 state of the pions recently discussed by several authors. Results are given for different sets of parameters describing the pion form factor, and the pcssibility of investigating ...
BROWN L. M, CALOGERO, Francesco
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Nuclear Physics B - Proceedings Supplements, 2010
The excellent agreement between a prediction and a measurement of the pion pion scattering lengths by NA48 collaboration is an important validation of the Chiral Dynamics approach.
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The excellent agreement between a prediction and a measurement of the pion pion scattering lengths by NA48 collaboration is an important validation of the Chiral Dynamics approach.
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Pion-induced pion production in nuclei
Physical Review C, 1997The process of pion-induced pion production in nuclei has been studied with the A(π+,π+π-) and A(π+,π+π-p) reactions for four nuclei 2H, 12C, 40Ca, and 208Pb at an incident pion energy of Tπ+=283 MeV. The π+π- and π+π-p particles in the final state were detected in coincidence with the CHAOS spectrometer at TRIUMF.
M. Kermani +25 more
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