Production of positive pions by neutron-proton collisions

Kleinschmidt, M.; Fischer, Tony; Hammel, G.; Hürster, W.; Kern, Klaus; Lehmann, Lukas; Rössle, E.; Schmitt, H.

doi:10.1007/bf01425155

Cited by 34 publications

(17 citation statements)

References 18 publications

(29 reference statements)

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“…Therefore most previous experiments used either a continuous neutron beam in a fairly wide energy range [1] or investigated the pn-interaction with a proton beam and a deuteron target as a neutron source [2,3,4]. Of course, it is worth to mention the works where the energies of neutrons were defined using the timeof-flight technique [5,6].…”

Section: Introductionmentioning

confidence: 99%

The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c

et al. 2009

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A detailed investigation of the reaction np → ppπ − has been carried out using the data obtained with the continuous neutron beam produced by charge exchange scattering of protons off a deuterium target. A partial wave event-by-event based maximum likelihood analysis was applied to determine contributions of different partial waves to the pion production process. The combined analysis of the np → ppπ − and pp → ppπ 0 data measured in the same energy region allows us to determine the contribution of isoscalar partial waves (I=0) in the momentum range from 1.1 up to 1.8 GeV/c. The decay of isoscalar partial waves into ( 1 S0)ppπ channel provides a good tool for a determination of the pp S-wave scalar scattering length in the final state which was found to be app = −7.5 ± 0.3 fm.PACS. 13.75.Cs Nucleon-nucleon interactions -13.85.Lg Total cross sections -25.40.Fq Inelastic neutron scattering

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Section: Introductionmentioning

confidence: 99%

The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c

et al. 2009

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“…[3][4][5] one finds for the cross section cos θ * < 0. Due to this small range in cos θ * we consider these data unfit for a reliable interpolation.…”

Section: Resultsmentioning

confidence: 98%

“…In this case one might either use a neutron beam impinging on a hydrogen target or use a deuterium target as a substitute for a neutron and use the spectator model to determine the observables of the quasifree reaction. The former approach was extensively used by the Freiburg group working at PSI [4][5][6][7] and to some extent by groups at LAMPF [8] and TRIUMF [9]. The first dedicated experiments on a deuterium target were also performed at TRIUMF [10,11] where in order to bypass the difficulties of low-energy spectator detection, the final-state protons were restricted to the 1 S 0 , the "diproton" state, by selecting only two-proton events with a small relative momentum.…”

Section: Introductionmentioning

confidence: 99%

Single $\mathrm{\ensuremath{\pi^{-}}}$ production in np collisions for excess energies up to 90 MeV

et al. 2008

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The quasifree reaction np → ppπ − 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 timeof-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. The behavior of the elementary cross section σ 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.

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“…However, the situation for σ 01 was not clear in the past. Several experiments reported significant σ 01 values below 600 MeV [28,29,30,31,32], while others found small or even negligible σ 01 contributions for energies up to 750 MeV [33,34,35]. A partial wave analysis of Arndt and Verwest [36] gave no significant σ 01 contribution below 1 GeV while Bystricky et al [37] found small, but non-negligible values in a similar analysis.…”

Section: Determination Of σ 01mentioning

confidence: 95%

The reaction np→ppπ- from threshold up to 570 MeV

et al. 2007

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Abstract. Due to a coding error, the previous paper quoted incorrect values for the differential cross sections dσ/ dMpp and dσ/ dΩ * π of the process np → ppπ − . Due to a coding error, the previous paper [1] quoted incorrect values for the differential cross sections of the process np → ppπ − . The differential cross sections dσ/ dM pp as shown in Fig. 9 of [1] are too small by a factor of two. In Table 3 The online version of the original article can be found at http://dx

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Production of positive pions by neutron-proton collisions

Cited by 34 publications

References 18 publications

The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c

The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c

Single $\mathrm{\ensuremath{\pi^{-}}}$ production in np collisions for excess energies up to 90 MeV

The reaction np→ppπ- from threshold up to 570 MeV

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