Elementary nuclear excitations studied with electromagnetic and Hadronic probes

Richter, A.

doi:10.1007/3-540-59007-2_2

Cited by 1 publication

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“…The resulting ∆ self energy exhibits a dependence on the photon energy. Evaluated for the kinematics 1 and 2, which correspond to the photon equivalent energies k ρ 0 , one should stress that the on-shell ∆ self energy at resonance position is numerically considerably smaller [6,25]. As a result, the agreement with the transverse cross section is significantly improved, although the experimental values are still overestimated by about 30%.…”

Section: Modification Of the ∆mentioning

confidence: 99%

Self energies of the pion and the Δ isobar from the 3He(e,e′π+)3H reaction

et al. 2002

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In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the 3 He(e,e'π + ) 3 H reaction have been measured in the excitation Preprint submitted to Elsevier Science 28 April 2018 region of the ∆ resonance to determine the longitudinal (L), transverse (T ), and the LT interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and ∆-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the π + mass of ∆m π + = −1.7 + 1.7 − 2.1 MeV/c 2 in the neutron-rich nuclear medium at a density of ρ = 0.057 + 0.085 − 0.057 fm −3 . Our data are consistent with the ∆ self energy determined from measurements of π 0 photoproduction from 4 He and heavier nuclei.

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Section: Modification Of the ∆mentioning

confidence: 99%