Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Hadronenstruktur und -spektroskopie VI
HK 24.5: Vortrag
Dienstag, 22. März 2011, 17:45–18:00, C-2
Double-Pionic Fusion to 3He in dd Collisions - Quasifree versus Coherent Process* — •Elena Perez del Rio — Physikalisches Institut, Univ. Tübingen
The double-pionic fusion to 3He is generally studied via the reaction pd → 3Heππ. Exclusive and kinematically complete measurements of this reaction have been performed previously with the WASA detector in and above the energy region of the ABC effect, which denotes a puzzling low-mass enhancement in the ππ-invariant mass distribution.
In case of dd collisions this fusion occurs with an associatedly produced neutron in the reaction dd → 3Heππ n. The associatedly produced neutron has a momentum distribution with kinematic boundaries, which are given by the spectator emerging either from the target or from the beam in the course of a quasifree process. The kinematic region in-between is covered by non-quasifree, possibly coherent processes, where the associatedly produced neutron is no longer spectator, but active reaction partner.
We have investigated the diverse processes by measuring the dd collisions with the WASA detector setup at COSY both at energies below the ABC region for the quasifree process as well as at energies in the ABC region.
The experimental results for the different reaction scenarios will be discussed.
* supported by BMBF, COSY-FFE (FZ Jülich), DFG (European Graduate School)