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Pion absorption in C-12.

Tacik, R. ; Farzanpay, F. ; Mathie, E.L. ; et al.

Phys.Rev.C 57 (1998) 1295-1304, 1998.

Inspire Record 468876 DOI 10.17182/hepdata.25703

We have studied the two reactions 12C(π+,pp) and 12C(π+,ppp) in one experiment, using the CHAOS spectrometer at TRIUMF, at incident pion energies of 200, 240, and 280 MeV. In both cases, we are able to distinguish between reaction mechanisms involving only the detected protons, and those in which additional nucleons must have participated, on the basis of missing momentum. In the case of 12C(π+,ppp), we identify events due to the two step process of π+p quasielastic scattering followed by two-nucleon absorption. Estimates are made for the total cross sections for the various absorption mechanisms.

1 data table

Table 1

The total observed cross sections are not corrected for limited experimental acceptance. No errors are given. The comments (C=MNKO), (C=2NP), and (C=GT2NP) stand for multy nucleon knockout, 2 nucleons participated, and more than 2 nucleons participated, respectively.

Multinucleon contributions to the C-12(pi+,p p) reaction at 100-MeV and 165-MeV incident pion energies

Huber, G.M. ; Lolos, G.J. ; Papandreou, Z. ; et al.

Nucl.Phys.A 624 (1997) 623-654, 1997.

Inspire Record 459427 DOI 10.17182/hepdata.36491

Differential and total cross sections for π + absorption on 12 C are presented at incident pion energies of 100 and 165 MeV. This is the first time that this reaction has been measured with a combination of good energy and angle information over an extensive region of phase space. Results are compared to extensive Monte Carlo simulations in order to investigate the role of two- and multinucleon absorption processes in this nucleus. Signatures of ISI and FSI in the pion absorption process are also investigated, in order to explain the complex reaction mechanism implied by the data.

2 data tables

Table 1

Axis error includes +- 20/20 contribution (Relative systematic uncertainty).

Table 2

Axis error includes +- 20/20 contribution (Relative systematic uncertainty).

Role of quasideuteron absorption in the Li-6 (pi+, p p) reaction at T(pi+) = 100-MeV, 165-MeV

Lolos, G.J. ; Huber, G.M. ; Mathie, E.L. ; et al.

Phys.Rev.C 54 (1996) 211-221, 1996.

Inspire Record 429739 DOI 10.17182/hepdata.25756

Differential and total cross sections for π+ absorption on Li6, leading to the pp+4Heg.s., pp+4He*, and pp+X final states, are presented at incident pion energies of 100 and 165 MeV. We conclude that most of the cross section is confined to the level of coplanarity expected from quasideuteron absorption in the nuclear environment and that the contributions of nonquasideuteron absorption mechanisms are small. © 1996 The American Physical Society.

2 data tables

Table 1

No description provided.

Table 2

No description provided.