Pion interaction with the trinucleon up to the eta production threshold

Kamalov, S.S.; Tiator, L.; Bennhold, C.

doi:10.1103/PhysRevC.47.941

Pion interaction with the trinucleon up to the eta production threshold

S.S. Kamalov
(
- Mainz U., Inst. Kernphys.
)
,
L. Tiator
(
- Mainz U., Inst. Kernphys.
)
,
C. Bennhold
(
- TRIUMF
)

Jan 26, 1993

49 pages

Published in:

Phys.Rev.C 47 (1993) 941-956

e-Print:

nucl-th/9301004 [nucl-th]

DOI:

10.1103/PhysRevC.47.941

Report number:

MKPH-T-92-13

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Abstract:

Pion elastic, charge exchange scattering and induced eta production on the trinucleon systems are investigated in a coupled-channels approach in momentum space with Fadeev wave functions. The channel

\pi N \rightarrow \eta N

is included using an isobar model with S-, P-, and D-wave resonances. While the coherent reactions like

~3

He(

\pi,\pi)~3

He can be reasonably well reproduced up to

T_{\pi}

=500 MeV, large discrepancies appear for the incoherent processes,

~3

He(

\pi~-,\pi~0)~3

H and

~3

He(

\pi~-,\eta)~3

H at backward angles and energies above

\Delta

-resonance. In the forward direction the

(\pi,\eta)

calculations underestimate the experimental measurements very close to threshold but agreement with the data improves with increasing pion energy. Predictions are made for the asymmetries of the various reactions on polarized

~3

He.

pi nucleus: elastic scattering
elastic scattering: pi nucleus
pi nucleus: charge exchange
charge exchange: pi nucleus
pi nucleus: nuclear reaction
eta: hadroproduction
hadroproduction: eta
threshold
helium: nuclide
helium: polarized target

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