Electron and stochastic cooling at COSY

Prasuhn, D.; Dietrich, J.; Maier, R.; Stassen, R.; Stein, H. J.; Stockhorst, H.

doi:10.1016/s0168-9002(99)01128-6

Cited by 56 publications

(41 citation statements)

References 3 publications

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“…Measurements of the quasifree pn → pnη reaction have been performed at the cooler synchrotron COSY [25] at the Research Center Jülich in Germany by means of the COSY-11 detector setup [26] presented schematically in Fig. 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Based on the aforementioned spectator model and on the energy and momentum conservation, the four-momentum of the target neutron P n t ≡ (E n t , p n t ) at the moment of the collision was derived from the measured spectator four-momentum P sp ≡ (E sp , p sp ) according to the following formulas: E n t = m d − E sp , and p n t = − p sp , where m d denotes the mass of the deuteron. The absolute momentum of the beam proton was determined based on the known beam optics and the frequency measurement of the circulating beam [25]. The outgoing proton from the pn → pnX reaction was separated from the beam in the magnetic field of the dipole and it was identified by the independent measurement of its momentum and velocity using drift chambers and scintillators.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Moskal¹,

Czyzykiewicz²,

Adam³

et al. 2009

Phys. Rev. C

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Total cross sections for the quasifree pn → pnη reaction in the range from the kinematical threshold up to 20 MeV excess energy have been determined. At threshold they exceed corresponding cross sections for the pp → ppη reaction by a factor of about 3 in contrast to the factor of 6 established for higher excess energies. To large extent, the observed decrease of the ratio σ (pn → pnη)/σ (pp → ppη) toward threshold may be assigned to the different energy dependence of the proton-proton and proton-neutron final-state interactions. The experiment was conducted using a proton beam of the cooler synchrotron COSY and a cluster jet deuteron target. The proton-neutron reactions were tagged by the spectator proton whose momentum was measured for each event. Protons and neutron outgoing from the pn → pnη reaction have been registered by means of the COSY-11 facility, an apparatus dedicated for threshold meson production.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Moskal¹,

Czyzykiewicz²,

Adam³

et al. 2009

Phys. Rev. C

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“…The frequency shift measurement of the coasting uncooled proton beam was done with the existing Schottky pick-up and the spectrum analyzer of the stochastic cooling system operated on harmonic number 1000 [16]. The statistical distribution of the particles in the beam is at the origin of the Schottky noise.…”

Section: Pos(stori11)039mentioning

confidence: 99%

Absolute measurement of the differential cross section for pp elastic scattering at ANKE-COSY

Chiladze¹

2012

Proceedings of 8th International Conference on Nuclear Physics at Storage Rings — PoS(STORI11)

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Very little is known experimentally on proton-proton elastic scattering in the energy range from 1.6 to 2.8 GeV for centre-of-mass angles between about 10 and 30 degrees. The differential cross section data that do exist seem to fall systematically below the predictions of the SAID data analysis program. Measurements in this kinematical region are possible at the ANKE spectrometer, which is situated inside the COSY-Jülich storage ring. The fast proton scattered at small angles is registered in the Forward Detection system and the slow recoil proton emerging at large angles is measured by the Silicon Tracking Telescopes. The ANKE collaboration and the COSY machine crew have jointly developed a very accurate method for determining the absolute luminosity in an experiment at an internal target position. The technique relies on measuring the energy losses due to the electromagnetic interactions of the beam as it passes repeatedly through the thin target and measuring the shift of the revolution frequency by studying the Schottky spectrum. This powerful technique allows to measure the absolute differential cross section for elastic pp scattering with high precision. First results from this experiment are presented in this contribution.

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“…The cooled beam of protons [25] circulated in the ring of the cooler synchrotron COSY through a stream of the hydrogen cluster target [26]. In the magnetic field of the COSY dipole, the final state protons from the pp !…”

mentioning

confidence: 99%

“…The standard technique for monitoring the beam momentum at the COSY accelerator is through the measurement of the frequency distribution of the circulating beam. Such a distribution can be transformed to the momentum coordinate by using the values of the accelerator settings [25]. As an example, a spectrum for the lowest beam energy used in the experiment is presented in the left corner of Fig.…”

mentioning

confidence: 99%

Determination of the Total Width of theη′Meson

et al. 2010

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Taking advantage of both the low-emittance proton beam of the cooler synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the η' meson was measured with a resolution of 0.33 MeV/c2 (FWHM), improving the experimental mass resolution by almost an order of magnitude with respect to previous results. Based on the sample of more than 2300 reconstructed pp → ppη' events, the total width of the η' meson was determined to be Γ(η') = 0.226 ± 0.017(stat) ± 0.014(syst) MeV/c2.

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Electron and stochastic cooling at COSY

Cited by 56 publications

References 3 publications

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Absolute measurement of the differential cross section for pp elastic scattering at ANKE-COSY

Determination of the Total Width of theη′Meson

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