Analysing power for the reaction 
                $\mathrm{np} \rightarrow \mathrm{pp} \pi^{-}$
               and for np elastic scattering from 270 to 570 MeV

Daum, M.; Фингер, М.; Franz, J.; Heinsius, F. H.; Janata, A.; Königsmann, K.; Lacker, H. M.; Lehár, Franz; Schmitt, H.; Schweiger, Wolfgang; Sereni, P.; Slunečka, M.

doi:10.1007/s10052-002-1002-2

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…In particular, they measured the differential cross section d 2 σ/(dΩdm 2 pp ) and analyzing power A y for T lab = 353 MeV (η=0.66), where the final diproton relative momentum p ′ was restricted to be not larger than 38 MeV/c (M pp −2M N ≃ 1.5 MeV). A similar measurement for the analyzing power was also performed at PSI [46] for T lab = 345 MeV and pp invariant masses M pp − 2M N < 6 MeV. It is interesting to note that the positions of the peaks in A y seem to be somewhat different in these experiments (see Fig.…”

Section: Reaction Pn → Ppπ −mentioning

confidence: 57%

“…As described above, we do not calculate the swave pion amplitudes in this work but rather take both their strength and the phases directly from experiment. To be specific, for the reaction pn → ppπ − we aim at the description of the double differential cross sections and the analyzing power measured at TRIUMF [44,45] and PSI [46]. Following the Watson theorem to parameterize the relevant 3…”

Section: A Parameters Of the Calculationmentioning

confidence: 99%

“…Shown are the results for d = 3 (red solid line), d = 0 (black dashed line) and d = −3 (blue dot-dashed line). The data is from TRIUMF[44,45] (black squares) and from PSI[46] (blue circles) .…”

mentioning

confidence: 99%

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p-wave pion production from nucleon-nucleon collisions

Baru

Epelbaum²,

Haidenbauer³

et al. 2009

Phys. Rev. C

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We investigate p-wave pion production in nucleon-nucleon collisions up to next-to-next-to-leading order in chiral effective field theory. In particular, we show that it is possible to describe simultaneously the p-wave amplitudes in the pn → ppπ − , pp → pnπ + , pp → dπ + channels by adjusting a single low-energy constant accompanying the short-range operator which is available at this order. This study provides a non-trivial test of the applicability of chiral effective field theory to reactions of the type N N → N N π.

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Section: Reaction Pn → Ppπ −mentioning

confidence: 57%

Section: A Parameters Of the Calculationmentioning

confidence: 99%

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p-wave pion production from nucleon-nucleon collisions

Baru

Epelbaum²,

Haidenbauer³

et al. 2009

Phys. Rev. C

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“…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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“…9. The ANKE data are shown together with the results from TRIUMF [15] and PSI [16] and compared to the prediction of the IKP theory group [14]. The value of LEC d = 3 is favored, though it must be stressed that the 4.…”

Section: Predictionsmentioning

confidence: 99%

Near-threshold pion production in diproton reactions at ANKE

Dymov¹

2011

J. Phys.: Conf. Ser.

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Abstract. With the advent of chiral perturbation theory (χPT), the low-energy effective field theory of QCD, accurate calculations have become possible for hadronic reactions. The extension of the approach to pion production in nucleon-nucleon collisions requires new high precision experimental information in the near-threshold region.Of especial interest are the processes pp → {pp}sπ 0 and pn → {pp}sπ − , with the formation of a 1 S0 proton pair (diproton) in the final state. The measurements of dσ/dΩ, Ay and the spincorrelation coefficients Ax,x and Ax,z will permit an amplitude analysis that should provide a non-trivial test of the χPT predictions. A combined study of these processes will lead to the isolation of the strength parameter d of the 4N π contact operator in χPT.The ANKE spectrometer is particularly well suited for the study of reactions with a final diproton. The use of the polarised COSY beams and the ANKE polarised internal target allows one to conduct single and double polarisation experiments. Preliminary results on the near-threshold measurements at ANKE of Ay in these processes are presented. The future experimental programme, including the double-polarised experiments, is discussed.1. Introduction 1.1. The diproton programme at ANKE The two-nucleon systems, being the simplest cases of (un-)bound hadrons, play important roles in the studies of hadronic interactions and the structure of the lightest nuclei. The production of the deuteron, a bound state of the proton and neutron, has been studied extensively, both theoretically and experimentally, in a large number of processes. Of particular interest, though, is the investigation of the diproton, an unbound system of two protons. The selection of a very low excitation energy proton pair, E pp < 3 MeV, ensures the dominance of the 1 S 0 state of the diproton, which simplifies significantly the theoretical interpretation. The diproton, denoted below as {pp} s , can be considered as a spin-isospin partner of the deuteron, but with different quantum numbers. As a consequence, reactions that lead to the formation of a diproton involve transitions in the N N system that are different from those in the deuteron case. In particular, the role of the ∆ isobar is expected to be much suppressed because the S-wave ∆N intermediate state is generally forbidden.The detection of a proton pair with E pp < 3 MeV in an experiment requires excellent excitation energy resolution coupled with the ability to resolve the two spatially close proton trajectories. This explains why there have been so few attempts to study reactions with a diproton in the final state. It should be noted that the ANKE spectrometer [1] provides a

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Analysing power for the reaction $\mathrm{np} \rightarrow \mathrm{pp} \pi^{-}$ and for np elastic scattering from 270 to 570 MeV

Cited by 14 publications

References 17 publications

p-wave pion production from nucleon-nucleon collisions

p-wave pion production from nucleon-nucleon collisions

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

Near-threshold pion production in diproton reactions at ANKE

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