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| Journal Article | PreJuSER-2579 |
;
2008
Springer
Berlin
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Please use a persistent id in citations: http://hdl.handle.net/2128/10503 doi:10.1140/epja/i2007-10543-x
Abstract: The quasifree reaction np --> pp pi(-) was studied in a kinematically complete experiment by bombarding a liquid-hydrogen target with a deuteron beam of momentum 1.85GeV/c and analyzing the data along the lines of the spectator model. In addition to the three charged ejectiles the spectator proton was also detected in the large-acceptance time-of-flight spectrometer COSY-TOF. It was identified by its momentum and flight direction thus yielding access to the Fermi motion of the bound neutron and to the effective neutron 4-momentum vector P-n which differed from event to event. A range of almost 90 MeV excess energy above threshold was covered. Energy-dependent angular distributions, invariant-mass spectra as well as fully covered Dalitz plots were deduced. Sizeable pp FSI effects were found as were contributions of p and d partial waves. In comparison with existing literature data the results provide a sensitive test of the spectator model. The behavior of the elementary cross-section sigma(01) close to threshold is discussed in view of new cross-section data.
Keyword(s): p deuteron: interaction ; p n: exclusive reaction ; pi-: hadroproduction ; p: spectator ; angular distribution ; mass spectrum: (2p) ; energy dependence ; Dalitz plot ; final-state interaction ; partial wave ; fast logic: time-of-flight ; magnetic spectrometer: experimental results ; Juelich COSY PS ; deuteron p --> 3p pi- ; n p --> 2p pi- ; 0.925 GeV/c/nucleon
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