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34 results on '"Alef, S."'

1. $K^+\Lambda(1520)$ photoproduction at forward angles near threshold with the BGOOD experiment

Author

Rosanowski, E. O., Jude, T. C., Alef, S., Figueiredo, A. J. Clara, Burdeinyi, D. D, Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Ganenko, V. B, Ghio, F., Groß, J., Kohl, K., Sandri, P. Levi, Mandaglio, G., Messi, R., Moricciani, D., Pedroni, P., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., and Sonnenschein, A.

Subjects
Nuclear Experiment
Abstract

The differential cross section for $\gamma p\rightarrow K^+\Lambda(1520)$ was measured from threshold to a centre-of-mass energy of 2090\,MeV at forward angles at the BGOOD experiment. The high statistical precision and resolution in centre-of-mass energy and angle allows a detailed characterisation of this low-momentum transfer kinematic region. The data agree with a previous LEPS measurement and support effective Lagrangian models that indicate that the contact term dominates the cross section near threshold., Comment: 6 pages, 7 figures

Published
2024

2. Coherent $\pi^0\eta d$ photoproduction at forward deuteron angles measured at BGOOD

Author

Figueiredo, A. J. Clara, Jude, T. C., Alef, S., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Groß, J., Kohl, K., Sandri, P. Levi, Mandaglio, G., Pedroni, P., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Sonnenschein, A., and Tillmanns, C.

Subjects
Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\eta d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 3200\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ and $\eta$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction at forward angles by orders of magnitude. The distribution of the differential cross section has an excellent agreement with a model including quasi-free $\Delta \pi$ photoproduction, pion re-scattering and $N(1535)$ formation and subsequent nucleon coalescence to the deuteron. This also gives a reasonable description of the two-body invariant mass distributions and naturally explains the similar magnitudes of this channel and $\pi^0\pi^0 d$ coherent photoproduction., Comment: 7 pages, 5 figures

Published
2024

3. Evidence of a dibaryon spectrum in coherent $\pi^0\pi^0 d$ photoproduction at forward deuteron angles

Author

Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\pi^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63\,GeV/c$^2$. A low mass enhancement in the $\pi^0\pi^0$ invariant mass is also observed at the $d^*(2380)$ centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the $\pi^0 d$ invariant mass at 2114\,MeV/c$^2$ with a width of 20\,MeV/c$^2$ supports a sequential two-dibaryon decay mechanism., Comment: 8 pages, 10 figures. Additional references (recommended by colleagues) added since the first revision

Published
2022
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4. Measurement of the $\gamma n\rightarrow K^0\Sigma^0$ differential cross section over the $K^*$ threshold

Author

Kohl, K., Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P., Salvo, R. D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

The differential cross section for the quasi-free photoproduction reaction $\gamma n\rightarrow K^0\Sigma^0$ was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV. Close to threshold the results are consistent with existing data and are in agreement with partial wave analysis solutions over the full measured energy range, with a large coupling to the $\Delta$(1900)1/2- evident. This is the first dataset covering the K* threshold region, where there are model predictions of dynamically generated vector meson-baryon resonance contributions., Comment: 6 pages, 8 figures

Published
2021

5. Photoproduction of $K^+\Lambda(1405) \rightarrow K^+\pi^0\Sigma^0$ extending to forward angles and low momentum transfer

Author

Scheluchin, G., Jude, T. C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Braghieri, A., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Fromberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Schmieden, H., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

$K^+\Lambda(1405)$ photoproduction has been studied at the BGOOD experiment via the all neutral decay, $\Lambda(1405)\rightarrow\Sigma^0\pi^0$. The unique BGOOD experimental setup allows both the cross section and $\Lambda(1405)$ invariant mass distribution (line shape) to be measured over a broad $K^+$ polar angle range, extending to extreme forward $K^+$ angles unattainable at previous experiments. Evidence is provided for the role of a triangle singularity driven by the $N^*(2030)$ resonance, which appears to contribute significantly to $K^+\Lambda(1405)$ photoproduction. This is observed in both the angular distributions and the integrated cross section which was determined with unprecedented energy resolution. The measured line shape is also in agreement with the previous results of CLAS and ANKE, and is consistent with two poles derived in $\chi$PT based models.

Published
2021
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6. Strangeness Photoproduction at the BGO-OD experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Braghieri, A., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Subjects
Nuclear Experiment
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+\Sigma^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+\Lambda$(1405)$\rightarrow K^+\Sigma^0\pi^0$, and a peak structure in $K^0_S\Sigma^0$ photoproduction. The peak in the $K^0_S\Sigma^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector., Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)

Published
2020

7. Observation of a cusp-like structure in the $\gamma p \rightarrow K^+\Sigma^0$ cross section at forward angles and low momentum transfer

Author

Jude, T. C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Sandri, A. Lapik P. Levi, Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A, Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Sarantsev, A. V, Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

The $\gamma p \rightarrow K^+\Sigma^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^+$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism., Comment: 9 pages (including a 2 page appendix of tabulated data), 10 figures

Published
2020
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8. $K^+\Lambda$ photoproduction at forward angles and low momentum transfer

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T. C., Kohl, K., Kozlenko, N., Sandri, A. Lapik P. Levi, Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A, Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Sarantsev, A. V, Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

$\gamma p \rightarrow K^+ \Lambda$ differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment at ELSA, utilising the high angular and momentum resolution forward spectrometer for charged particle identification. The data discriminates between conflicting results in the world data set and enable extraction of the cross section as the minimum momentum transfer to the recoiling hyperon is approached., Comment: 12 pages (including a 2 page appendix), 14 figures

Published
2020
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9. Measurement of the γn→K0Σ0K∗ differential cross section over the γn→K0Σ0K∗ threshold

Author

Kohl, K., Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Published
2023
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10. The BGOOD experimental setup at ELSA

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bieling, J., Boese, S., Braghieri, A., Brinkmann, K. -Th., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Gervino, G., Ghio, F., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hillert, W., Jahn, O., Jahn, R., Johnstone, J. R., Joosten, R., Jude, T. C., Kleber, V., Klein, F., Kohl, K., Koop, K., Kozlenko, N., Krusche, B., Lapik, A., Sandri, P. Levi, Lisin, V., Lopatin, I., Mandaglio, G., Manganaro, M., Messi, F., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Rostomyan, T., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Zaunick, H. -G., and Zimmermann, T.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The BGOOD experiment at the ELSA facility in Bonn has been commissioned within the framework of an international collaboration. The experiment pursues a systematic investigation of non-strange and strange meson photoproduction, in particular $t$-channel processes at low momentum transfer. The setup uniquely combines a central almost $4\pi$ acceptance BGO crystal calorimeter with a large aperture forward magnetic spectrometer providing excellent detection of both neutral and charged particles, complementary to other setups such as Crystal Barrel, Crystal Ball, LEPS and CLAS., Comment: 26 pages, 37 figures

Published
2019
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11. Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bielefeldt, P., Boese, S., Braghieri, A., Brinkmann, K., Cole, P., Curciarello, F., De Leo, V., Di Salvo, R., Dutz, H., Elsner, D., Fantini, A., Freyermuth, O., Friedrich, S., Frommberger, F., Ganenko, V., Gervino, G., Ghio, F., Giardina, G., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hartmann, P., Hillert, W., Ignatov, A., Jahn, R., Joosten, R., Klein, F., Koop, K., Krusche, B., Lapik, A., Sandri, P. Levi, Lopatin, I. V., Mandaglio, G., Messi, F., Messi, R., Metag, V., Moricciani, D., Mushkarenkov, A., Nanova, M., Nedorezov, V., Novinskiy, D., Pedroni, P., Reitz, B., Romaniuk, M., Rostomyan, T., Rudnev, N., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Watts, D., Zaunick, H., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

BGO-OD is a newly commissioned experiment to investigate the internal structure of the nucleon, using an energy tagged bremsstrahlung photon beam at the ELSA electron facility. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating meson photoproduction. The extensive physics programme for open strangeness photoproduction is introduced, and preliminary analysis presented., Comment: 6 pages, 4 figures. Proceedings for the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

Published
2015

12. Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonski, A., Reitz, B., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Published
2019
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13. K+Λ photoproduction at forward angles and low momentum transfer

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T. C., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Sarantsev, A. V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Published
2021
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14. The BGOOD experimental setup at ELSA

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bieling, J., Böse, S., Braghieri, A., Brinkmann, K.-Th., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Gervino, G., Ghio, F., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hillert, W., Jahn, O., Jahn, R., Johnstone, J. R., Joosten, R., Jude, T. C., Kalinowsky, H., Kleber, V., Klein, F., Kohl, K., Koop, K., Kozlenko, N., Krusche, B., Lapik, A., Sandri, P. Levi, Lisin, V., Lopatin, I., Mandaglio, G., Manganaro, M., Messi, F., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Rostomyan, T., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Zaunick, H.-G., and Zimmermann, T.

Published
2020
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15. Measurement of the γn→K0Σ0 differential cross section over the K∗ threshold.

Author

Kohl, K., Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., and Mandaglio, G.

Abstract

The differential cross section for the quasi-free photoproduction reaction γ n → K 0 Σ 0 was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV . Close to threshold the results are consistent with existing data and are in agreement with partial wave analysis solutions over the full measured energy range, with a large coupling to the Δ (1900) 1 / 2 - evident. This is the first dataset covering the K ∗ threshold region, where there are model predictions of dynamically generated vector meson-baryon resonance contributions. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Erratum to: Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonski, A., Reitz, B., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Published
2020
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17. Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles

Author

Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S, Gridnev, A., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear and High Energy Physics, Coherent photoproduction, Dibaryon, Settore FIS/04, BGOOD, Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\pi^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63\,GeV/c$^2$. A low mass enhancement in the $\pi^0\pi^0$ invariant mass is also observed at the $d^*(2380)$ centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the $\pi^0 d$ invariant mass at 2114\,MeV/c$^2$ with a width of 20\,MeV/c$^2$ supports a sequential two-dibaryon decay mechanism., Comment: 8 pages, 10 figures. Additional references (recommended by colleagues) added since the first revision

Published
2022

18. Photoproduction of K+Λ(1405)→K+π0Σ0 extending to forward angles and low momentum transfer

Author

Scheluchin, G., primary, Jude, T.C., additional, Alef, S., additional, Bauer, P., additional, Bayadilov, D., additional, Beck, R., additional, Braghieri, A., additional, Cole, P.L., additional, Elsner, D., additional, Di Salvo, R., additional, Fantini, A., additional, Freyermuth, O., additional, Frommberger, F., additional, Ghio, F., additional, Gridnev, A., additional, Hammann, D., additional, Hannappel, J., additional, Kohl, K., additional, Kozlenko, N., additional, Lapik, A., additional, Levi Sandri, P., additional, Lisin, V., additional, Mandaglio, G., additional, Messi, R., additional, Moricciani, D., additional, Mushkarenkov, A., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonskiy, A., additional, Reitz, B.-E., additional, Romaniuk, M., additional, Schmieden, H., additional, Sumachev, V., additional, and Tarakanov, V., additional

Published
2022
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19. Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles

Author

Jude, T.C., primary, Alef, S., additional, Beck, R., additional, Braghieri, A., additional, Cole, P.L., additional, Elsner, D., additional, Di Salvo, R., additional, Fantini, A., additional, Freyermuth, O., additional, Frommberger, F., additional, Ghio, F., additional, Gridnev, A., additional, Kohl, K., additional, Kozlenko, N., additional, Lapik, A., additional, Levi Sandri, P., additional, Lisin, V., additional, Mandaglio, G., additional, Moricciani, D., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonskiy, A., additional, Reitz, B.-E., additional, Romaniuk, M., additional, Scheluchin, G., additional, Schmieden, H., additional, Stuglev, A., additional, Sumachev, V., additional, and Tarakanov, V., additional

Published
2022
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20. Photoproduction of Λ(1405)→ Σ Extending to Forward Angles and low Momentum Transfer

Author

Scheluchin, G., Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.E., Romaniuk, M., Schmieden, H., Sumachev, V., and Tarakanov, V.

Abstract

K+Λ(1405) photoproduction has been studied at the BGOOD experiment via the all neutral decay, Λ(1405)→Σ0π0. The unique BGOOD experimental setup allows both the cross section and Λ(1405) invariant mass distribution (line shape) to be measured over a broad K+ polar angle range, extending to extreme forward K+ angles unattainable at previous experiments.Evidence is provided for the role of a triangle singularity driven by the N⁎(2030) resonance, which appears to contribute significantly to K+Λ(1405) photoproduction. This is observed in the integrated cross section which was determined with unprecedented energy resolution and supported by the angular distributions. The measured line shape is also in agreement with the previous results of CLAS and ANKE, and is consistent with two poles derived in χPT based models.

Published
2022

21. Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer

Author

Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V.A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Sarantsev, A.V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Published
2021
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22. Observation of a cusp-like structure in the → Σ Cross Section at Forward Angles and low Momentum Transfer

Author

Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V.A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.E., Romaniuk, M., Sarantsev, A.V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Abstract

The γp→K+Σ0 differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the K+ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900 MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.

Published
2021

23. Measurement of the $��n\rightarrow K^0��^0$ differential cross section over the $K^*$ threshold

Author

Kohl, K., Alef, S., Beck, R., Braghieri, A., Cole, P., Salvo, R. D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The differential cross section for the quasi-free photoproduction reaction $��n\rightarrow K^0��^0$ was measured at BGOOD at ELSA from threshold to a center-of-mass energy of 2400 MeV. An increase in the cross section is observed at forward angles above 2000 MeV. The available statistics prevent an accurate description of this behavior, however it appears consistent with models describing a resonance of dynamically generated vector meson-baryon states, where an equivalent model predicted the $P_C$ states observed at LHCb. If proven correct, this could indicate parallels between the strange and charmed quark sectors., 6 pages, 8 figures

Published
2021
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24. Commissioning and initial experimental program of the BGO-OD experiment at ELSA

Author

Alef S., Bauer P., Bayadilov D., Beck R., Becker M., Bella A., Bielefeldt P., Böse S., Braghieri A., Brinkmann K., Cole P., Di Salvo R., Dutz H., Elsner D., Fantini A., Freyermuth O., Friedrich S., Frommberger F., Ganenko V., Geffers D., Gervino G., Ghio F., Görtz S., Gridnev A., Gutz E., Hammann D., Hannappel J., Hillert W., Ignatov A., Jahn R., Joosten R., Jude T.C., Klein F., Knaust J., Kohl K., Koop K., Krusche B., Lapik A., Levi Sandri P., Lopatin I.V., Mandaglio G., Messi F., Messi R., Metag V., Moricciani D., Mushkarenkov A., Nanova M., Nedorezov V., Novinskiy D., Pedroni P., Reitz B., Romaniuk M., Rostomyan T., Rudnev N., Schaerf C., Scheluchin G., Schmieden H., Stugelev A., Sumachev V., Tarakanov V., Vegna V., Walther D., Watts D., Zaunick H., and Zimmermann T.

Subjects
Physics, QC1-999
Abstract

BGO-OD is a new meson photoproduction experiment at the ELSA facility of Bonn University. It aims at the investigation of non strange and strange baryon excitations, and is especially designed to be able to detect weekly bound meson-baryon type structures. The setup for the BGO-OD experiment is presented, the characteristics of the photon beam and the detector performances are shown and the initial experimental program is discussed.

Published
2016
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25. Área foliar e índice SPAD do girassol sob irrigação e adubação organomineral

Author

Jaqueline Aparecida Batista Soares, Gustavo Quereza de Freitas, Marconi Batista Teixeira, Fernando Nobre Cunha, Luiz Fernando Gomes, Fernando Rodrigues Cabral Filho, Alef S. da S. Costa, and Daniely Karen Matias Alves

Subjects
Chlorophyll b, Irrigation, Available water capacity, lcsh:Social Sciences, chemistry.chemical_compound, Helianthus annuus, lcsh:Science (General), General Environmental Science, Mathematics, lcsh:LC8-6691, Fertilizante mineral, lcsh:Special aspects of education, Sowing, Clorofila, 04 agricultural and veterinary sciences, Sunflower, lcsh:H, Horticulture, chemistry, Chlorophyll, Lysimeter, Déficit hídrico, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, General Earth and Planetary Sciences, lcsh:Q1-390
Abstract

Objetivou-se no presente estudo, avaliar a área foliar, a Clorofila a, b e total e o índice SPAD do girassol cultivada sob diferentes condições de déficit hídrico e, níveis de adubações com NPK de origem mineral e organomineral. O experimento foi conduzido em vasos plásticos preenchidos com Latossolo Vermelho distroférrico, localizado em área experimental do Instituto Federal Goiano, no município de Rio Verde, Goiás. O delineamento experimental utilizado foi o de blocos ao acaso analisado em esquema fatorial 4×4×2, com três repetições. Os tratamentos foram as combinações de quatro reposições hídricas iguais a 50, 75, 100 e 125% da capacidade de água disponível no solo; quatro doses do formulado de NPK referentes a 50, 100, 150 e 200% da recomendação e duas fontes do formulado NPK, mineral e organomineral. As reposições hídricas foram determinadas através de lisímetros de pesagem eletrônica e a água aplicada via sistema de gotejamento superficial. O número de folhas, a área foliar, a clorofila a, clorofila b, a clorofila total e o índice SPAD foram avaliados aos 20, 40, 60 e 80 dias após a semeadura. A reposição hídrica de 125% proporciona o maior número de folhas e área foliar do girassol cv. Aguará 6. O número de folhas, área foliar e índice SPAD do girassol cv. Aguará 6 é maior quando se utiliza o fertilizante mineral.

Published
2020

26. Observation of a cusp-like structure in the $��p \rightarrow K^+��^0$ cross section at forward angles and low momentum transfer

Author

Jude, T. C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Sandri, A. Lapik P. Levi, Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A, Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Sarantsev, A. V, Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The $��p \rightarrow K^+��^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^+$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism., 9 pages (including a 2 page appendix of tabulated data), 10 figures

Published
2020
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27. $$K^{+}\Lambda $$ photoproduction at forward angles and low momentum transfer

Author

Alef, S., primary, Bauer, P., additional, Bayadilov, D., additional, Beck, R., additional, Bella, A., additional, Bieling, J., additional, Braghieri, A., additional, Cole, P. L., additional, Elsner, D., additional, Di Salvo, R., additional, Fantini, A., additional, Freyermuth, O., additional, Frommberger, F., additional, Ghio, F., additional, Goertz, S., additional, Gridnev, A., additional, Hammann, D., additional, Hannappel, J., additional, Jude, T. C., additional, Kohl, K., additional, Kozlenko, N., additional, Lapik, A., additional, Levi Sandri, P., additional, Lisin, V., additional, Mandaglio, G., additional, Messi, F., additional, Messi, R., additional, Moricciani, D., additional, Nedorezov, V., additional, Nikonov, V. A., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonskiy, A., additional, Reitz, B.-E., additional, Romaniuk, M., additional, Sarantsev, A. V., additional, Scheluchin, G., additional, Schmieden, H., additional, Stuglev, A., additional, Sumachev, V., additional, Vegna, V., additional, Tarakanov, V., additional, and Zimmermann, T., additional

Published
2021
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28. Agronomic Performance of Millet Plants Grown in Soil Fertilized With Organic Wastes

Author

Morais, Wilker A., primary, Soares, Frederico A. L., additional, Cunha, Fernando N., additional, Teixeira, Marconi B., additional, Costa, Cicero T. S., additional, Filho, Fernando R. Cabral, additional, Vieira, Gustavo da S., additional, Marques, Vinícius de O., additional, Moraes, Giovani S., additional, Alves, Daniely K. M., additional, Pereira, Leandro S., additional, Silva, Igor O. F., additional, and Costa, Alef S. da S., additional

Published
2019
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29. Agronomic Performance of Millet Plants Grown in Soil Fertilized With Organic Wastes

Author

Frederico Antonio Loureiro Soares, Fernando Nobre Cunha, Fernando Rodrigues Cabral Filho, Daniely Karen Matias Alves, Marconi Batista Teixeira, Igor Olacir Fernandes Silva, Gustavo da Silva Vieira, Vinícius de O. Marques, Leandro Spíndola Pereira, Alef S. da S. Costa, Wilker Alves Morais, Giovani Santos Moraes, and Cicero Teixeira Silva Costa

Subjects
chemistry.chemical_classification, Randomized block design, Sowing, 04 agricultural and veterinary sciences, Biology, Manure, Nutrient, chemistry, Agronomy, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Organic matter, Soil fertility, Poultry litter, Panicle
Abstract

Information on the potential of organic matter for soil fertility is important to an efficiently replenishment of nutrients. In this context, the objective of this work was to evaluate the agronomic performance of millet plants grown in soil fertilized with different rates of organic wastes, through biometric variables. A randomized block experimental design with a 4 × 2 factorial arrangement was used with four replications, consisting of 32 experimental units. The treatments consisted of four organic matter sources (swine manure, sewage sludge, bovine manure, and poultry litter), and two organic matter rates (10 and 20 dm3); 50 dm3 pots filled with an agricultural soil that is predominant in the region were used. The pots were filled with 80% of soil and 20% of organic matter (10 dm3); and with 60% of soil and 40% of organic matter (20 dm3). Plant height (PH), leaf area (LA), stem diameter (SD), and number of expanded leaves (NL) were evaluated at 20, 40, 60, and 80 days after sowing (DAS); panicle length (PNL), and panicle diameter (PD) were measured at 80 DAS. All biometric variables evaluated indicated that the better organic matter rate for soil fertilization for millet crops is 10 dm3. In general, the highest panicle lengths and diameters were found in plants grown in soil with bovine manure.

Published
2019

30. Quality of Roof-Harvested Rainwater for Irrigation of Crops by Family Farmers in Brazil

Author

Alves, Daniely K. M., primary, Couto, Bruno de O. C., additional, Cabral Filho, Fernando R., additional, Teixeira, Marconi B., additional, Manso, Rannaiany T., additional, Vieira, Gustavo da S., additional, Cunha, Fernando N., additional, Oliveira, Jean G., additional, Costa, Alef S. da S., additional, Souza, Eduardo R. de O., additional, Melo, Aurélio F., additional, Marquês, Vinicius de O., additional, Souza, Victor P. de, additional, and Lira, Laura C. de, additional

Published
2018
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31. Strangeness photoproduction at the BGO-OD experiment

Author

Jude, Thomas, primary, Alef, S., additional, Bauer, P., additional, Bayadilov, D., additional, Beck, R., additional, Bieling, J., additional, Bella, A., additional, Boese, S., additional, Braghieri, A., additional, Brinkmann, K., additional, Burdeynyi, D., additional, Cole, P., additional, Di Salvo, R., additional, Elsner, D., additional, Fantini, A., additional, Freyermuth, O., additional, Friedrich, S., additional, Frommberger, F., additional, Gervino, G., additional, Ghio, F., additional, Gridnev, A., additional, Gutz, E., additional, Hammann, D., additional, Hannappel, J., additional, Hillert, W., additional, Jahn, R., additional, Joosten, R., additional, Klein, F., additional, Kohl, K., additional, Krusche, B., additional, Lapik, A.M., additional, Levi Sandri, P., additional, Lisin, V.P., additional, Lopatin, I.V., additional, Mandaglio, G., additional, Messi, F., additional, Messi, R., additional, Metag, V., additional, Moricciani, D., additional, Mushkarenkov, A.N., additional, Nanova, M., additional, Nedorezov, V.G., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonski, A.S., additional, Reitz, B., additional, Romaniuk, M., additional, Scheluchin, G., additional, Schmieden, H., additional, Stugelev, A., additional, Sumachev, V., additional, Tarakanov, V., additional, Vegna, V., additional, Walther, D., additional, Zaunick, H., additional, and Zimmermann, T., additional

Published
2018
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32. Quality of Roof-Harvested Rainwater for Irrigation of Crops by Family Farmers in Brazil

Author

Laura Campos de Lira, Eduardo R. de O. Souza, Aurélio F. Melo, Bruno de O. C. Couto, Victor P. de Souza, Vinícius de O. Marques, R. T. Manso, Marconi Batista Teixeira, Jean G. Oliveira, Fernando Nobre Cunha, Gustavo da Silva Vieira, Alef S. da S. Costa, Fernando Rodrigues Cabral Filho, and Daniely Karen Matias Alves

Subjects
Hydrology, Irrigation, business.industry, Water supply, Context (language use), 04 agricultural and veterinary sciences, 010501 environmental sciences, Total dissolved solids, 01 natural sciences, Rainwater harvesting, Salinity, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, Precipitation, Turbidity, business, 0105 earth and related environmental sciences
Abstract

The efficiency of family farmers irrigation is conditioned by several factors such as good quality water supply. In this context, it was to evaluate the salinity and physical, chemical, and bacteriological characteristics of water harvested from roofs for irrigation of crops by family farmers in Brazil. The experiment was conducted at the Federal Institute Goiano, in Rio Verde, Goiás, Brazil. The rainwater collected on the roofs was sent through vertical and horizontal conductors to the storage tank, which has a capacity of 5000 L. The risk of salinity, pH, turbidity, conductivity, color, total dissolved solids and thermotolerant coliforms during 13 precipitation events was analyzed. Rainwater was classified as water with no salinity problem (EC < 0.7). The variation of the electrical conductivity (EC) and Total Dissolved Solids (TDS) were similar during the collection period, with mean values of 0.05 dS m-1 and 29.72 mg L-1 for EC and TDS, respectively. The pH of the rainwater presented little variation, presenting a mean of 7.37. The mean value of the color of rainwater was 11.45 PtCo L-1, while the turbidity averaged 4.89 UT. During the period of rainwater harvesting, it was observed absence of thermotolerant coliforms in all samples. It is concluded that rainwater does not present restrictions on the risk of salinity and that all physical-chemical and bacteriological parameters analyzed are within the limits allowed by Resolution 357/2005 of CONAMA, indicating the propensity of this type of water for irrigation.

Published
2018

33. Polarised Photon Beams for the BGO-OD Experiment at ELSA

Author

Zimmermann, T., primary, Bella, A., additional, Alef, S., additional, Bayadilov, D., additional, Beck, R., additional, Becker, M., additional, Bielefeldt, P., additional, Boese, S., additional, Braghieri, A., additional, Brinkmann, K., additional, Cole, P., additional, Curciarello, F., additional, De Leo, V., additional, Di Salvo, R., additional, Dutz, H., additional, Elsner, D., additional, Fantini, A., additional, Freyermuth, O., additional, Friedrich, S., additional, Frommberger, F., additional, Ganenko, V., additional, Gervino, G., additional, Ghio, F., additional, Giardina, G., additional, Goertz, S., additional, Gridnev, A., additional, Gutz, E., additional, Hammann, D., additional, Hannappel, J., additional, Hartmann, P., additional, Hillert, W., additional, Ignatov, A., additional, Jahn, R., additional, Joosten, R., additional, Jude, T. C., additional, Klein, F., additional, Koop, K., additional, Krusche, B., additional, Lapik, A., additional, Sandri, P. Levi, additional, Lopatin, I. V., additional, Mandaglio, G., additional, Messi, F., additional, Messi, R., additional, Metag, V., additional, Moricciani, D., additional, Mushkarenkov, A., additional, Nanova, M., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Reitz, B., additional, Romaniuk, M., additional, Rostomyan, T., additional, Rudnev, N., additional, Schaerf, C., additional, Scheluchin, G., additional, Schmieden, H., additional, Stugelev, A., additional, Sumachev, V., additional, Tarakanov, V., additional, Vegna, V., additional, Walther, D., additional, Watts, D., additional, and Zaunick, H., additional

Published
2016
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34. Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., primary, Alef, S., additional, Bayadilov, D., additional, Beck, R., additional, Becker, M., additional, Bella, A., additional, Bielefeldt, P., additional, Boese, S., additional, Braghieri, A., additional, Brinkmann, K., additional, Cole, P., additional, Curciarello, F., additional, De Leo, V., additional, Di Salvo, R., additional, Dutz, H., additional, Elsner, D., additional, Fantini, A., additional, Freyermuth, O., additional, Friedrich, S., additional, Frommberger, F., additional, Ganenko, V., additional, Gervino, G., additional, Ghio, F., additional, Giardina, G., additional, Goertz, S., additional, Gridnev, A., additional, Gutz, E., additional, Hammann, D., additional, Hannappel, J., additional, Hartmann, P., additional, Hillert, W., additional, Ignatov, A., additional, Jahn, R., additional, Joosten, R., additional, Klein, F., additional, Koop, K., additional, Krusche, B., additional, Lapik, A., additional, Sandri, P. Levi, additional, Lopatin, I. V., additional, Mandaglio, G., additional, Messi, F., additional, Messi, R., additional, Metag, V., additional, Moricciani, D., additional, Mushkarenkov, A., additional, Nanova, M., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Reitz, B., additional, Romaniuk, M., additional, Rostomyan, T., additional, Rudnev, N., additional, Scheluchin, G., additional, Schmieden, H., additional, Stugelev, A., additional, Sumachev, V., additional, Tarakanov, V., additional, Vegna, V., additional, Walther, D., additional, Watts, D., additional, Zaunick, H., additional, and Zimmermann, T., additional

Published
2016
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