<i>π</i>p elastic scattering from 67 to 139 MeV

Absolute vr+p elastic scattering differential cross sections have been measured at five incident pion energies between 87 and 139 MeV. An active target of scintillator material (CHq q) was used to detect recoil protons in coincidence with scattered pions. Pions were detected at forward angles between 27 and 98, where the low-energy recoil protons stop in the target. The cross sections, typically 5 -10+0 lower than phase shift predictions for vr p and 10 -20% lower for the vr p cross sections, are consistent with earlier measurements by this group.PACS number(s): 25.80.Dj, 25.10.+s

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“…Results obtained &om this experiment are in excellent agreement with the earlier results [13] f'rom this collaboration as shown in Fig. 5.…”

Section: Resultssupporting

confidence: 90%

“…Setup The experiment was performed using incident pions of 87, 98, 117, 126, and 139 MeV. Incident center-of-target beam energies for each data run were calculated from NMR values for the first M11 bending magnet Bl, using the energy calibration of the channel[18,13]. (This calibration has been confirmed by measurements made in 1994. )…”

mentioning

confidence: 99%

Forward angleπ±pelastic scattering differential cross sections atTπ<

et al. 1995

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“…The published π − p partial-total and total cross sections cannot be used, as they contain a large component from CX scattering; the inclusion of these data in any part of the analysis would have cast doubt on any conclusions about the violation of isospin invariance. Our database therefore consisted of measurements of the DCS [17,18], [20]- [23] and [30], and of the analysing power [24], [31]- [33]. The experiment of JANOUSCH97 [30] measured the DCS at a single angle (175 • in the CM frame) at five energies; the data were treated as five one-point experiments.…”

Section: The Databases For π ± P Elastic Scatteringmentioning

confidence: 99%

Phase-shift analysis of low-energy elastic-scattering data

Matsinos¹,

Woolcock²,

Oades³

et al. 2006

Nuclear Physics A

140

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Using electromagnetic corrections previously calculated by means of a potential model, we have made a phase-shift analysis of the π ± p elastic-scattering data up to a pion laboratory kinetic energy of 100 MeV. The hadronic interaction was assumed to be isospin invariant. We found that it was possible to obtain self-consistent databases by removing very few measurements. A pion-nucleon model, based on sand u-channel diagrams with N and ∆ in the intermediate states, and σ and ρ t-channel exchanges, was fitted to the elastic-scattering database obtained after the removal of the outliers. The model-parameter values showed an impressive stability when the database was subjected to different criteria for the rejection of experiments. Our result for the pseudovector πN N coupling constant (in the standard form) is 0.0733 ± 0.0014. The six hadronic phase shifts up to 100 MeV are given in tabulated form. We also give the values of the s-wave scattering lengths and the p-wave scattering volumes. Big differences in the s-wave part of the interaction were observed when comparing our hadronic phase shifts with those of the current GWU solution. We demonstrate that the hadronic phase shifts obtained from the analysis of the elastic-scattering data cannot reproduce the measurements of the π − p charge-exchange reaction, thus corroborating past evidence that the hadronic interaction violates isospin invariance. Assuming the validity of the result obtained Preprint submitted to Elsevier Science within the framework of chiral perturbation theory, that the mass difference between the u-and the d-quark has only a very small effect on the isospin invariance of the purely hadronic interaction, the isospin-invariance violation revealed by the data must arise from the fact that we are dealing with a hadronic interaction which still contains residual effects of electromagnetic origin. PACS: 13.75.Gx; 25.80.Dj; 25.80.Gn

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“…Following [4], we consider two parametrizations of the potential (4) equivalent to the SIII and the SkM * forces ( [18]). These two forces correspond respectively to a HARD and a SOFT EOS.…”

Section: Forces and Infinite Nuclear Matter Propertiesmentioning

confidence: 99%

“…Since eq. (21) defines only the density profile and not the wavefunctions, we have used the Extended Thomas Fermi formalism described in [18] where two additional terms are added to the usual Thomas Fermi kinetic energy…”

Section: Generalization Of the Zero Temperature Equation Of Statementioning

confidence: 99%

Time-dependent Hartree-Fock simulation of the expansion of abraded nuclei

Lacroix

Chomaz

1998

Phys. Rev. C

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A recent interpretation of the caloric curve based on the expansion of the abraded spectator nucleus is re-analysed in the framework of the Time-Dependent Hartree-Fock (TDHF) evolution. It is shown that the TDHF dynamics is more complex than a single monopolar collective motion at moderate energy. The inclusion of other important collective degrees of freedom may lead to the dynamical creation of hollow structure. Then, low density regions could be locally reached after a long time by the creation of these exotic density profiles. In particular the systematic of the minimum density reached during the expansion (the so-called turning points) appears to be different.

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πp elastic scattering from 67 to 139 MeV

Cited by 118 publications

References 7 publications

Forward angleπ±pelastic scattering differential cross sections atTπ<

Forward angleπ±pelastic scattering differential cross sections atTπ<

Phase-shift analysis of low-energy elastic-scattering data

Time-dependent Hartree-Fock simulation of the expansion of abraded nuclei

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