Total and partial pion absorption cross sections on He-4 in the Delta resonance region.

The LADS collaboration Mateos, A.O. ; Androic, D. ; Backenstoss, G. ; et al.
Phys.Rev.C 58 (1998) 942-952, 1998.
Inspire Record 475367 DOI 10.17182/hepdata.25715

This paper presents a large solid angle measurement of the positive pion absorption cross section on 4He and its decomposition into partial channels. The total absorption cross sections at incident pion kinetic energies of Tπ+=70, 118, 162, and 239 MeV are 35±5, 52±4, 51±5, and 27±2 mb, respectively. These values are lower than those reported in some previous experiments. At all pion energies a large fraction of the absorption cross section is due to multinucleon channels.

1 data table

Data with (C=PRC) are taken from PR C56, 1872.


Total cross sections of the charge exchange reaction (pi+,pi0) on H-2, He-3, and He-4 across the Delta(1232) resonance.

The LADS collaboration Lehmann, A. ; Androic, D. ; Backenstoss, G. ; et al.
Phys.Rev.C 60 (1999) 024603, 1999.
Inspire Record 482653 DOI 10.17182/hepdata.25512

Results from a 4π solid angle measurement of the inclusive reaction (π+,π0) on 2H, 3He, and 4He at incident pion energies of Tπ+=70, 118, 162, 239, and 330 MeV are presented. The single charge exchange total cross sections were determined, and are compared to previous results and simple models of π–few-nucleon interactions. On the helium isotopes a strong damping of the cross sections in the Δ(1232) energy region is observed. Total cross sections of the breakup reaction π++2H →π+pn are also given.

1 data table

No description provided.


Initial state interaction in the (pi+,3p) reaction on N, Ar and Xe.

The LADS collaboration Kotlinski, B. ; Androic, D. ; Backenstoss, G. ; et al.
Eur.Phys.J.A 1 (1998) 435-445, 1998.
Inspire Record 466881 DOI 10.17182/hepdata.43749

The pion absorption reaction (π+,3p) on Ar was studied at pion energies of 70, 118, 162 and 239 MeV, and on N and Xe at 239 MeV. The 3p cross secti

2 data tables

No description provided.

No description provided.


Pion absorption on He-3 and He-4 with emission of three energetic protons.

The LADS collaboration Lehmann, A. ; Androic, D. ; Backenstoss, G. ; et al.
Phys.Rev.C 55 (1997) 2931-2950, 1997.
Inspire Record 440453 DOI 10.17182/hepdata.25724

Results from a 4π solid angle measurement of the reactions 3He(π+,ppp) and 4He(π+,ppp)n at incident pion energies of Tπ+=70, 118, 162, 239, and 330 MeV are presented. For 3He the total absorption cross sections and their decomposition into two-proton and three-proton components are evaluated; for 4He the three-proton absorption cross sections are given. The differential distributions of the three-proton multinucleon absorption mode of both nuclei are analyzed and compared to each other by making use of a complete set of variables. The data are investigated for signatures of initial and final state interactions: it is found that more than half of the three-proton yield cannot be accounted for by cascade mechanisms. The remaining strength shows dependence on the incident pion angular momentum, but also structures that are not explained by simple semiclassical models.

3 data tables

Absorption cross section. Total errors are presented.

First and second errors are due to fits and normalization uncertainties, respectively.

First and second errors are due to fits and normalization uncertainties, respectively.


A Large Solid Angle Study of Pion Absorption on He3

The LADS collaboration Alteholz, T. ; Androic, D. ; Backenstoss, G. ; et al.
Phys.Rev.Lett. 73 (1994) 1336-1339, 1994.
Inspire Record 372679 DOI 10.17182/hepdata.19679

Measurements have been made of pi+ absorption on He3 at T_pi+ = 118, 162, and 239 MeV using the Large Acceptance Detector System (LADS). The nearly 4pi solid angle coverage of this detector minimizes uncertainties associated with extrapolations over unmeasured regions of phase space. The total absorption cross section is reported. In addition, the total cross section is divided into components in which only two or all three nucleons play a significant role in the process. These are the first direct measurements of the total and three nucleon absorption cross sections.

2 data tables

ABSORPTION CROSS SECTION.

ABSORPTION CROSS SECTION.