Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-08-29
Eur.Phys.J.A36:7-16,2008
Physics
Nuclear Physics
Nuclear Experiment
21 pages, 9 figures, 4 tables, submitted to EPJA
Scientific paper
10.1140/epja/i2007-10543-x
The quasifree reaction $np\to pp\pim$ was studied in a kinematically complete experiment by bombarding a liquid hydrogen target with a deuteron beam of momentum 1.85 GeV/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 $\mathbb{P}_n$ 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. The behavior of the elementary cross section $\sigma_{01}$ close to threshold is discussed in view of new cross section data. In comparison with existing literature data the results provide a sensitive test of the spectator model.
Abdel-Bary COSY-TOF collaboration: M.
Brinkmann K.-Th.
Clement Heinz
Doroshkevich E.
Dshemuchadse S.
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