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

Abstract

The DUET Collaboration reports on the measurements of the absorption (σABS) and charge exchange (σCX) cross sections of positively charged pions on carbon nuclei for the momentum range 201.6 MeV/c to 295.1 MeV/c. The uncertainties on the absorption and charge exchange cross sections are ∼9.5% and ∼18%, respectively. The results are in good agreement with previous experiments. A covariance matrix correlating the 5 σABS and 5 σCX measured data points is also reported.

Using world π± -nucleus scattering data to constrain an intranuclear cascade model

“…One of the additions to this fit over previous attempts is the new DUET data [43,72]. DUET made measurements specifically targeted at T2K's needs and pro-vided more information than available from most historical measurements from the 1950's-1990's.…”

“…Polarity Targets pπ [MeV/c] Channel(s) B. W. Allardyce et al [26] π ± 12 C, 27 Al, 207 Pb 710-2000 REAC A. Saunders et al [27] π ± 12 C, 27 Al 116-149 REAC C. J. Gelderloos et al [28] π − 12 C, 27 Al, 63 Cu, 207 Pb 531-615 REAC F. Binon et al [29] π − 12 C 219-395 REAC O. Meirav et al [30] π ± 12 C, 16 O 128-169 REAC C. H. Q. Ingram [31] π + 16 O 211-353 QE S. M. Levenson et al [32] π + 12 C 194-416 QE M. K. Jones et al [33] π + 12 C, 208 Pb 363-624 QE, CX D. Ashery et al [34] π ± 12 C, 27 Al, 56 Fe 175-432 QE, ABS+CX H. Hilscher et al [35] π − 12 C 156 CX T. J. Bowles [36] π + 16 O 128-194 CX D. Ashery et al [37] π ± 12 C, 16 O, 207 Pb 265 CX K. Nakai et al [38] π ± 27 Al, 63 Cu 83-395 ABS E. Bellotti et al [39] π + 12 C 230 ABS E. Bellotti et al [40] π + 12 C 230 CX I. Navon et al [41] π + 12 C, 56 Fe 128 ABS+CX R. H. Miller et al [42] π − 12 C, 207 Pb 254 ABS+CX E. S. Pinzon Guerra et al [43] π + 12 C 206-295 ABS, CX TABLE II. Summary of π ± -A scattering data used for this tuning, including beam polarity, nuclear target type(s), momentum range and interaction channel(s).…”

“…Most of the datasets used date from the 1950's-1990's, and contain limited information: in particular, covariances between datapoints in each channel, and between channels, are not available. A notable exception is the recent measurement of the ABS and CX cross sections by the DUET collaboration [43]. These measurements were partially motivated by the need to cover the lack of ABS measurements in the ∆(1232) resonance region, which is of particular importance for T2K.…”

“…DUET measurements of ABS and CX compared with previous measurements[33,37,39,40] and ABS (red) and CX (black) model predictions from GEANT4 (solid line), FLUKA (dashed line), and NEUT (dotted line). Reproduced from Ref [43]…”

“…The diagonal and lower triangle show the covariance (sgn(Vij) × Vij), while the upper triangle of the matrix shows the correlation coefficients. Reproduced from Ref [43]…”