SEARCH FOR BREMSSTRAHLUNG RADIATION IN QUASI-FREE np→npγ REACTIONS

Przerwa, J.; Adam, H.-H.; Budzanowski, A.; Czyzykiewicz, R.; Grzonka, D.; Janusz, M.; Jarczyk, L.; Kamys, B.; Khoukaz, A.; Kilian, K.; Klaja, P.; Lang, N.; Moskal, P.; Oelert, W.; Piskor-Ignatowicz, C.; Rożek, T.; Santo, R.; Sefzick, T.; Siemaszko, M.; Smyrski, J.; Täschner, A.; Winter, P.; Wolke, M.; Wüstner, P.; Zipper, W.

doi:10.1142/s0217751x0502197x

Cited by 5 publications

(4 citation statements)

References 5 publications

(6 reference statements)

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“…The measurement of the η ′ meson production in the proton-neutron collision [2] has been conducted using a proton beam of the Cooler Synchrotron COSY [9] and a cluster jet deuteron target [10]. More details concerning functioning of the particular detectors and method of the measurement of the quasi-free reaction can be found in references [1,2,11,12]. In this article we will concentrate on the neutral particle detector [13,14,15] which has been designed to deliver the time at which the registered neutron or gamma quantum induced a hadronic or electromagnetic reaction, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

Study of the near threshold total cross sesctions for the quasi-free pn-->pn eta prime reaction with the COSY-11 detector

Klaja,

Moskal,

Zdebik

2009

Preprint

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The measurement of the quasi-free production of the η ′ meson has been carried out at the COSY-11 detection setup using a proton beam and a deuteron cluster target. The energy dependence of the cross section is extracted using a fixed proton beam momentum of p beam = 3.35 GeV/c and exploiting the Fermi momenta of nucleons inside deuterons. The data cover a range of centre-of-mass excess energies from 0 to 24 MeV. Due to the low statistics at the present stage only upper limits for the cross sections could be extracted. In this article we focus on the functioning and efficiency determination of the neutron detector.

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Section: Experimental Methodsmentioning

confidence: 99%

Study of the near threshold total cross sesctions for the quasi-free pn-->pn eta prime reaction with the COSY-11 detector

Klaja,

Moskal,

Zdebik

2009

Preprint

Self Cite

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“…Protons are measured in two drift chambers and scintillator de- tectors [11,13], neutrons are registered in the neutral particle detector [14]. A quasi-free pn → pnX reactions were induced by a proton beam in a deuteron target since pure neutron targets do not exist.…”

Section: Experimental Methodsmentioning

confidence: 99%

Study of the isospin dependence of the η[sup ʹ] production in the collision of nucleons

Przerwa¹

2007

AIP Conference Proceedings

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According to the quark model, the masses of η and η mesons should be almost equal. However, the empirical values of these masses differ by more than the factor of two. Similarly, though the almost the same quark-antiquark content, the total cross section for the creation of these mesons close to the kinematical thresholds in the pp → ppX reaction differs significantly. Using the COSY-11 detection setup we intend to determine whether this difference will also be so significant in the case of the production of these mesons in the proton-neutron scattering. Our main aim is the determination of the excitation function of the total cross section for the pn → pnη reaction near the kinematical threshold. The comparison of the pp → ppη and pn → pnη total cross sections will allow to learn about the production of the η meson in the channels of isospin I = 0 and I = 1 and to investigate aspects of the gluonium component of the η meson.

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“…The COSY-11 facility used to investigate the quasi-free pn → pnX reactions is equipped with detectors for the registration of fast charged particles [18,19], neutrons [20,21] and slow spectator protons [9]. Experiments are conducted using the COSY proton beam [22,23] incident on the internal deuteron cluster target [24,25].…”

Section: Derivation Of the Background Assuming Infinite Statisticsmentioning

confidence: 99%

A method to disentangle single- and multi-meson production in missing mass spectra from quasi-free pn → pnXreactions

Moskal

Adam

Budzanowski³

et al. 2006

J. Phys. G: Nucl. Part. Phys.

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The separation of contributions from multi-and single-meson production in the missing mass spectrum of the quasi-free pn → pnX reaction constitutes a challenging task when the reaction is studied close to threshold. This is especially true if the resolution of the mass determination is comparable with the excess energy and if the investigated signal appears close to the kinematical limit. In this article we outline a method which permits the extraction of the signal originating from the creation of a single meson without the necessity of conducting model-dependent simulations. For the pd → pnXpspectator reactions, the method allows one to combine events corresponding to multi-meson production at various excess energies with respect to the pn → pn meson process, and hence leads to an increase of the statistics needed for the determination of the shape of the multi-meson background.As an example of the application of the method, we demonstrate that the evaluation of the data from the pd → pnXpsp process according to the described technique enables one to extract a signal of the pn → pnη reaction whose shape is consistent with expectations, supporting the correctness and usefulness of the method introduced.

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SEARCH FOR BREMSSTRAHLUNG RADIATION IN QUASI-FREE np→npγ REACTIONS

Cited by 5 publications

References 5 publications

Study of the near threshold total cross sesctions for the quasi-free pn-->pn eta prime reaction with the COSY-11 detector

Study of the near threshold total cross sesctions for the quasi-free pn-->pn eta prime reaction with the COSY-11 detector

Study of the isospin dependence of the η[sup ʹ] production in the collision of nucleons

A method to disentangle single- and multi-meson production in missing mass spectra from quasi-free pn → pnXreactions

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