Inclusive pion single-charge-exchange reactions

Abstract

The (m+, m ) and (m. , m ) reactions were studied on a variety of nuclei at a bombarding energy of 160 MeV. The full m energy spectra were measured with a m spectrometer at several detection angles. The energy spectra and angular distributions are characteristic of quasifree reactions. Effects due to multiple scattering, neutron screening, and Pauli blocking are clearly observed.

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

“…This is evaluated from differences between external pion interaction data [40][41][42][43][44][45][46][47][48][49][50][51] and the underlying GEANT4 simulation. The external data do not cover the whole momentum range of T2K, so some extrapolation is necessary.…”

Measurement ofσABSandσCXofπ+on carbon by the Dual Use Experiment at TRIUMF (DUET)

“…The discrepancy among models is largest in the forward region, where CEMBALOS is most sensitive. In particular, the Geant4 Bertini Cascade model used by our simulation shows the largest disagreement with data [6]. The modeling of the multiplicity and kinematics for nucleons ejected following an ABS or CX interaction show even larger discrepancies among models.…”

“…1. The total, elastic and quasi-elastic processes have been measured with < 10% precision by various experiments [1][2][3][4][5][6][7][8][9][10][11], however data are scarce for inelastic processes such as absorption (ABS: π ± + A → (A − N ) + N ) and single charge exchange (CX: π ± +A → π 0 +(A−N )+N ), where "N" represents any number of nucleons leaving the nucleus. Moreover, the majority of past experiments measured the combined rate of these two processes [12,13], and relied on other experimental results or on theoretical calculations to separate their individual contribution while ignoring possible correlations and systematic uncertainties.…”

Coincidence measurements of the (. pi. /sup +/,. pi. /sup 0/p) reaction in the /triangle/-resonance region

“…22 and Fig. 5.15), and it is most likely yet another manifestation of the influence of multi-step processes.…”

“…Most recent (TT,7T'N} and (TT, it') measurements in the A-resonance region support the hypothesis that these reactions are indeed predominantly quasi-free in this region, particularly for the case of scattering to backward pion angles. 20 " 22 …”