The crystal barrel spectrometer at LEAR

Aker, E.; Amsler, C.; Augustin, I.; Baker, C.A.; Barnett, B. M.; Batty, C.J.; Beckmann, R.; Birien, P.; Bistirlich, J.; Blüm, P.; Bossingham, R.; Bossy, H.; Braune, K.; Bugg, D. V.; Burchell, M. J.; Case, T.; Cierjacks, S.; Crowe, K. M.; Dederichs, K.; Doser, M.; Dünnweber, W.; Emerich, Hermann; Engelhardt, D.; Faessler, M.; Felix, Corinne; Folger, G.; Friedrich, Jan; Hackmann, R.; Haddock, R. P.; Hammer, H.-W.; Heinsius, F. H.; Hessey, N. P.; Illinger, P.; Jamnik, D.; Kalinowsky, H.; Kämmle, B.; Kiel, T.; Klempt, E.; Koch, H.; Kolo, Castulus; Königsmann, K.; Krennrich, F.; Kunze, M.; Landua, R.; Lüdemann, J.; Matthaey, H.; Merkel, M.; Merlo, J.-P.; Meyer, Chris; Meyer‐Berkhout, U.; Montanet, L.; Noble, A. J.; Peters, K.; Rohrbach, W.; Sanjari, A. H.; Schäfer, Erich; Schmid, B.; Schott, W.; Sidiropoulos, K.; Spanier, S.; Staude, A.; Straßburger, C.; Strohbusch, U.; Suffert, M.; Sutton, C.; Urner, D.; Völcker, C.; Walther, Dirk; Walther, S. M.; Weddigen, Ch.; Wiedner, U.; Winter, N.; Zoll, J.; Zupančič, Č.

doi:10.1016/0168-9002(92)90379-i

Cited by 301 publications

(57 citation statements)

References 17 publications

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“…Decay photons from mesons produced in the target were registered in the combined Crystal Barrel (CB) and MiniTAPS detector system. The CB detector [30] [31,32] at a distance of 210 cm from the center of the CB, consisting of 216 BaF 2 crystals, read out via PMTs with electronics described in [33]. The high granularity and the large solid angle coverage made the detector system ideally suited for the detection and reconstruction of multiphoton events.…”

Section: Methodsmentioning

confidence: 99%

Determination of the real part of theη′-Nb optical potential

Nanova¹,

Friedrich²,

Metag³

et al. 2016

Phys. Rev. C

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ReuseItems deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.PHYSICAL REVIEW C 94, 025205 (2016) Determination of the real part of the η ′ -Nb optical potential The excitation function and momentum distribution of η ′ mesons have been measured in photoproduction off 93 Nb in the energy range of 1.2-2.9 GeV. The experiment has been performed with the combined Crystal Barrel and MiniTAPS detector system, using tagged photon beams from the ELSA electron accelerator. Information on the sign and magnitude of the real part of the η ′ -Nb potential has been extracted from a comparison of the data with model calculations. An attractive potential of −(41 ± 10(stat) ± 15(syst)) MeV depth at normal nuclear matter density is deduced within model uncertainties. This value is consistent with the potential depth of −(37 ± 10(stat) ± 10(syst)) MeV obtained in an earlier measurement for a light nucleus (carbon). This relatively shallow η ′ -nucleus potential will make the search for η ′ -nucleus bound states more difficult.

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Section: Methodsmentioning

confidence: 99%

Determination of the real part of theη′-Nb optical potential

Nanova¹,

Friedrich²,

Metag³

et al. 2016

Phys. Rev. C

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“…The Crystal Barrel detector, which has been described in detail elsewhere [4], has been designed with a cylindrical geometry along the beam axis. Thep p annihilation took place in a liquid hydrogen target cell with a length of 4.4 cm and a diameter of 1.6 cm located in the center of the detector.…”

Section: Crystal Barrel Experimentsmentioning

confidence: 99%

Spin density matrix of the $$\omega $$ ω in the reaction $${\bar{p}p}\,\rightarrow \,\omega \pi ^0$$ p ¯ p → ω π 0

et al. 2015

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The spin density matrix of the ω has been determined for the reactionp p → ωπ 0 with unpolarized inflight data measured by the Crystal Barrel LEAR experiment at CERN. The two main decay modes of the ω into π 0 γ and π + π − π 0 have been separately analyzed for variousp momenta between 600 and 1940 MeV/c. The results obtained with the usual method by extracting the matrix elements via the ω decay angular distributions and with the more sophisticated method via a full partial wave analysis are in good agreement. A strong spin alignment of the ω is clearly visible in this energy regime and all individual spin density matrix elements exhibit an oscillatory dependence on the production angle. In addition, the largest contributing orbital angular momentum of thep p system

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“…The detector system consists of two electromagnetic calorimeters, the Crystal Barrel [3] and the Mini-TAPS detector [4], together covering the polar angle range from 1 • to 156 • and the full azimuthal angle. For charged particle identification, a three-layer scintillating fiber detector [5] surrounding the target, and plastic scintillators in forward direction were used.…”

Section: Discussionmentioning

confidence: 99%

Measurement of double polarization observables in meson photoproduction with the CBELSA/TAPS experiment

Hartmann¹

2014

Proceedings of XV International Conference on Hadron Spectroscopy — PoS(Hadron 2013)

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One of the remaining problems within the standard model is to gain a good understanding of the low energy regime of QCD, where perturbative methods fail. One key towards a better understanding is baryon spectroscopy. Unfortunately, in the past most baryon spectroscopy data have been obtained only using πN scattering. To gain access to resonances with small πN partial width, photoproduction experiments, investigating various final states, provide essential information. In order to extract the contributing resonances, partial wave analyses need to be performed. Here, the complete experiment is required to unambiguously determine the contributing amplitudes. This involves the measurement of carefully chosen single and double polarization observables. The Crystal Barrel/TAPS experiment with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam allows the measurement of a large set of polarization observables. Due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage, it is ideally suited for the measurement of the photoproduction of neutral mesons decaying into photons. Preliminary results for the target asymmetry T , recoil polarization P and the double polarization observable H are discussed for π 0 and η photoproduction off the proton.

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The crystal barrel spectrometer at LEAR

Cited by 301 publications

References 17 publications

Determination of the real part of theη′-Nb optical potential

Determination of the real part of theη′-Nb optical potential

Spin density matrix of the $$\omega $$ ω in the reaction $${\bar{p}p}\,\rightarrow \,\omega \pi ^0$$ p ¯ p → ω π 0

Measurement of double polarization observables in meson photoproduction with the CBELSA/TAPS experiment

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