Incoherent Neutral Pion Photoproduction on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>12</mml:mn></mml:mmultiscripts></mml:math>

Tarbert, C. M.; Watts, D. P.; Aguar, P.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Beck, R.; Bekrenev, V.; Boillat, B.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Codling, R. F. B.; Downie, E. J.; Föhl, K.; Glazier, D. I.; Grabmayr, P.; Gregor, R.; Heid, E.; Hornidge, D.; Jahn, O.; Kashevarov, V. L.; Knežević, Andrea; Kondratiev, R.; Korolija, M.; Kotulla, M.; Krambrich, D.; Krusche, B.; Lang, Μ.; Lisin, V.; Livingston, K.; Lugert, S.; MacGregor, I. J. D.; Manley, D. M.; Martínez, M.; McGeorge, J. C.; Mekterović, D.; Metag, V.; Nefkens, B. M. K.; Nikolaev, A.; Novotny, R.; Owens, R.O.; Pedroni, P.; Polonski, A.; Prakhov, S.; Price, J. W.; Rosner, G.; Rost, M.; Rostomyan, T.; Schadmand, S.; Schumann, S.; Sober, D. I.; Starostin, A.; Supek, I.; Thomas, A.; Unverzagt, M.; Walcher, Th.; Zehr, F.

doi:10.1103/physrevlett.100.132301

Cited by 34 publications

(13 citation statements)

References 16 publications

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“…The experimental setup is described in detail in Ref. [36]. The tagged photon beam had a resolution of ∼2 MeV full width and an intensity of ∼2×10 5 γ s −1 MeV −1 .…”

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confidence: 99%

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Neutron Skin ofPb208from Coherent Pion Photoproduction

Tarbert¹,

Watts²,

Glazier³

et al. 2014

Phys. Rev. Lett.

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210

176

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Information on the size and shape of the neutron skin on (208)Pb is extracted from coherent pion photoproduction cross sections measured using the Crystal Ball detector together with the Glasgow tagger at the MAMI electron beam facility. On exploitation of an interpolated fit of a theoretical model to the measured cross sections, the half-height radius and diffuseness of the neutron distribution are found to be c(n)=6.70±0.03(stat.) fm and a(n)=0.55±0.01(stat.)(-0.03)(+0.02)(sys.) fm, respectively, corresponding to a neutron skin thickness Δr(np)=0.15±0.03(stat.)(-0.03)(+0.01)(sys.) fm. The results give the first successful extraction of a neutron skin thickness with an electromagnetic probe and indicate that the skin of (208)Pb has a halo character. The measurement provides valuable new constraints on both the structure of nuclei and the equation of state for neutron-rich matter.

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“…The experimental setup is described in detail in Ref. [36]. The tagged photon beam had a resolution of ∼2 MeV full width and an intensity of ∼2×10 5 γ s −1 MeV −1 .…”

mentioning

confidence: 99%

“…Neutral pions were identified in the CB from their 2γ decay and their momenta were reconstructed from the energies and angles of the decay photons [36]. The coherent events were isolated from background by using the energy difference ∆E dif f π defined as:…”

mentioning

confidence: 99%

Neutron Skin ofPb208from Coherent Pion Photoproduction

Tarbert¹,

Watts²,

Glazier³

et al. 2014

Phys. Rev. Lett.

Self Cite

210

176

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“…5) and published in. 8 It is the first report of the measurement of neutral pion production for a specific excited state. This was an important step in the separation of the coherent process, especially for reaction on heavier nuclei.…”

Section: π 0 Photoproduction On Nucleimentioning

confidence: 99%

Recent Results From the Real Photon Experiment at Mami

Thomas

2010

Int. J. Mod. Phys. E

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Experiments with real photons have been performed for many years at the Mainz accelerator MAMI with different detectors. The upgraded MAMI C accelerator recently delivered electrons with an energy of 1604MeV. The A2 collaboration performs experiments with energy tagged polarised real photons produced via 'Bremsstrahlung'. Linear and circular photon polarisation is possible. In the years 2005/2006 the Crystal Ball detector with its unique detection capability for multi photon final states was set up in Mainz. The Crystal Ball at MAMI setup offers an excellent possibility to study decays of the η and η mesons. Due to the high intensity photon beam the apparatus can be seen as an η-factory. Recent results from the Crystal Ball experiment at MAMI are presented. In the future we plan to use a longitudinal and transverse polarised frozen spin target to investigate the spin polarisibilities of the nucleons. Experimental Apparatus Electron beam -MAMI acceleratorThe MAMI accelerator with its source of polarised electrons, based on the photoeffect on a strained GaAs crystal, routinely delivers polarised beam with a maximum energy of 1604 MeV. The new accelerator stage, MAMI C, is realized as a Harmonic Double Sided Microtron (HDSM). Main features of this new machine concept are the four 90 o bending magnets, with two LINACs working at 2.45GHz and the first harmonic. We typically have a degree of polarisation of approximately 85%. Details of this new machine type can be found in reference 1 and in another talk from this conference. 2 Photon beam -Glasgow taggerFor more than 20 years the international A2 collaboration has been measuring photoabsorption cross sections of circularly polarized photons on unpolarised and longitudinally polarized protons to determine the total cross section and partial reaction channels in a large kinematical range. This provides new information about 1064 Int. J. Mod. Phys. E 2010.19:1064-1075. Downloaded from www.worldscientific.com by UNIVERSITY OF WARSAW on 03/05/15. For personal use only.

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“…The existence of quasi-bound states should give rise to a strong enhancement of the threshold production cross section over phase-space expectation. Results for 3 He [14] have just been published and results for 7 Li are in preparation for publication [15].…”

Section: Pos(qnp2012)064mentioning

confidence: 99%

“…Incoherent production to excited nuclear states adds further degrees of freedom by the selection of the quantum numbers of the final state (allowing for different filters for the elementary amplitudes or the measurement of transition form factors). However, the cross sections are quite small so that so far almost only π 0 -production in the ∆-resonance region has been considered [7]. A recent overview over the experimental photonuclear programs at the involved accelerator laboratories is given in [8].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of mesons off light nuclei

Krusche

2012

Proceedings of Sixth International Conference on Quarks and Nuclear Physics — PoS(QNP2012)

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Recent results for the photoprodcution of mesons of light nuclei ( 2 H, 3 He, and 7 Li) are summarized. This series of experiments was run at the electron accelerators ELSA in Bonn and MAMI in Mainz, using tagged photon beams and almost 4π covering electromagnetic calorimeters as detectors. It covers two main topics. The investigation of meson production reactions off quasi-free neutrons is used as a tool for the study of the electromagnetic excitation spectrum of the neutron. Total cross sections, angular distributions, and polarization observables have been studied for different reactions and systematic effects arising from the quasi-free nature of the reactions have been carefully investigated. These experiments used mainly deuterium targets, but also 3 He for systematic cross-checks of nuclear effects. Some examples for η and double-pion production will be discussed. Photoproduction off nuclei was furthermore explored for the study of hadron in-medium properties and the interaction of mesons with nuclei. This program extends to heavier nuclei, but here we limit the discussion to the search for η-mesic states in helium and lithium nuclei.

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Incoherent Neutral Pion Photoproduction onC12

Cited by 34 publications

References 16 publications

Neutron Skin ofPb208from Coherent Pion Photoproduction

Neutron Skin ofPb208from Coherent Pion Photoproduction

Recent Results From the Real Photon Experiment at Mami

Photoproduction of mesons off light nuclei

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