118 results on '"Shafigullin, R."'
Search Results
2. Production of eta and 3pi mesons in the pd->3HeX reaction at 1360 and 1450 MeV
- Author
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Schoenning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Ekstroem, C., Fransson, K., Geren, L., Gustafsson, L., Hoeistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., tegner, P. -E., Engblom, P. Thoerngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.
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Nuclear Experiment - Abstract
The cross sections of the pd -> 3He eta, pd -> 3He pi0 pi0 pi0 and pd -> 3He pi+ pi- pi0 reactions have been measured at beam kinetic energies T_p= 1360 MeV and T_p= 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross section dsigma/dOmega of the eta meson in the pd -> 3He eta reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd -> 3He pi+ pi- pi0 and the pd -> 3He pi0 pi0 pi0 cross sections has been analysed in terms of isospin amplitudes. The reconstructed invariant mass distributions of the pi-pi, 3He-pi and 3He-2pi systems provide hints on the role of nucleon resonances in the 3pi production process., Comment: Shorter version accepted to EPJA 10 pages 14 figures
- Published
- 2010
- Full Text
- View/download PDF
3. The pd --> ^3He eta pi0 reaction at T_p = 1450 MeV
- Author
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Schoenning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Ekstroem, C., Fransson, K., Geren, L., Gustafsson, L., Hoeistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thoerngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
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Nuclear Experiment - Abstract
The cross section for the pd --> ^3He eta pi0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one ^3He and four photons from the decays of the two photons. The data indicate that the production mechanism involves the formation of the Delta(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final state particles are well reproduced by a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the pi^0 momentum in the ^3Hepi^0 system., Comment: 10 pages, 5 figures
- Published
- 2009
- Full Text
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4. Exclusive measurement of two-pion production in the dd --> 4Hepipi reaction
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Keleta, S., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demirors, L., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, R. J. M. Y., Schonning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.
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Nuclear Experiment - Abstract
The results from the first kinematically complete measurement of the dd --> 4Hepipi reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar pipi-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV, with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low pipi-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NN--> dpi sub-processes., Comment: 20 pages including 18 figures
- Published
- 2009
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5. Production of the omega meson in the pd --> 3He omega reaction at 1450 MeV and 1360 MeV
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Schonning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demirors, L., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Khemchandani, K. P., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.
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Nuclear Experiment - Abstract
The production of $\omega$ mesons in the $pd \to{}^3$He$ \omega$ reaction has been studied at two energies near the kinematic threshold, $T_p=1450$ MeV and $T_p=1360$ MeV. The differential cross section was measured as a function of the $\omega$ cm angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections., Comment: 10 pages, 13 figures
- Published
- 2009
- Full Text
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6. Polarisation of the omega meson in the pd-->3He+omega reaction at 1360 and 1450 MeV
- Author
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Schonning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demirors, L., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Koch, I., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.
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Nuclear Experiment - Abstract
The tensor polarisation of omega mesons produced in the pd-->3He+omega reaction has been studied at two energies near threshold. The 3He nuclei were detected in coincidence with the pi0pi+pi- or pi0gamma decay products of the omega. In contrast to the case of phi meson production, the omega mesons are found to be unpolarised. This brings into question the applicability of the Okubo-Zweig-Iizuka rule when comparing the production of vector mesons in low energy hadronic reactions., Comment: 11 pages, 4 figures
- Published
- 2008
- Full Text
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7. The WASA Detector Facility at CELSIUS
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Bargholtz, Chr., Bashkanov, M., Berłowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, H., Capellaro, F., Chilingarov, A., Clement, H., Comfort, J., Demirörs, L., Ekström, C., Fransson, K., Fridén, C. -J., Gerén, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, A., Johansson, T., Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, S., Kupść, A., Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, P., Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B. M. K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Pätzold, J., Petukhov, Y., Povtorejko, A., Reistad, D., Ruber, R. J. M. Y., Sandukovsky, S., Schönning, K., Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegnér, P. -E., Engblom, P. Thörngren, Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G. J., Wiedner, U., Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., and Złomańczuk, J.
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Nuclear Experiment - Abstract
The WASA 4pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is presented. A detailed description of the design, together with the anticipated and achieved performance parameters are given., Comment: 25 pages, 20 figures
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- 2008
- Full Text
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8. Measurement of eta meson decays into lepton-antilepton pairs
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Collaboration, CELSIUS/WASA, Berłowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, H., Cappellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupść, A., Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P. -E., Engblom, P. Thörngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.
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High Energy Physics - Experiment - Abstract
A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4., Comment: 9 pages, 10 Postscript figures, uses revtex4.sty, revised version after referee comments; conclusions unchanged
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- 2007
- Full Text
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9. Measurement of the eta->pi+pi-e+e- decay branching ratio
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Collaboration, CELSIUS-WASA, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, H., Capellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupsc, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegnér, P. -E., Engblom, P. Thörngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.
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High Energy Physics - Experiment - Abstract
The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., Comment: 10 pages,6 figures revised version
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- 2006
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10. CORPORATE INFORMATION SYSTEM FOR COMPLEX AUTOMATION OF BUSINESS AND PRODUCTION PROCESSES DURING WELL CONSTRUCTION
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Shafigullin, R. I., primary, Sagatov, R. F., additional, Aslyamov, A. I., additional, Pavlov, E I., additional, Mukhametzianov, R. F., additional, Abakumov, A. V., additional, Krasnikova, S. M., additional, Boyarov, F. G., additional, and Aslyamov, A. A., additional
- Published
- 2023
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11. The RED-100 two-phase emission detector
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Akimov, D. Yu., Aleksandrov, I. S., Belov, V. A., Bolozdynya, A. I., Burenkov, A. A., Vlasik, K. F., Gusakov, Yu. V., Dmitrenko, V. V., Dolgolenko, A. G., Efremenko, Yu. V., Kaplin, V. A., Kovalenko, A. G., Kozlova, E. S., Konovalov, A. M., Krakhmalova, T. D., Kumpan, A. V., Melikyan, Yu. A., Naumov, P. P., Rudik, D. G., Saldikov, I. S., Sosnovtsev, V. V., Tikhomirov, G. V., Tobolkin, A. A., Tolstukhin, I. A., Khromov, A. V., Uteshev, Z. M., Shakirov, A. V., Shafigullin, R. R., and Etenko, A. V.
- Published
- 2017
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12. Comparison of the results of puncture biopsies of thyroid nodes and ultrasound stratification of thyroid cancer risks according to the TIRADS system with the results of histological examination
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Shchegolev, A. A., primary, Larin, A. A., additional, Slobodyanik, A. S., additional, Svetlov, E. V., additional, and Shafigullin, R. R., additional
- Published
- 2022
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13. Thermostatting of the RED-100 liquid-xenon emission detector
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Bolozdynya, A. I., Efremenko, Yu. V., Sidorenko, A. V., Sosnovtsev, V. V., Tolstukhin, I. A., Shakirov, A. V., Shafigullin, R. R., and Khromov, A. V.
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- 2016
- Full Text
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14. Thermal stabilization system for the RED-100 liquid-xenon emission detector
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Ananiev, V. V., Bolozdynya, A. I., Vlasik, K. F., Dmitrenko, V. V., Efremenko, Yu. V., Uteshev, Z. M., Sosnovtsev, V. V., Tolstukhin, I. A., Shakirov, A. V., Shafigullin, R. R., and Khromov, A. V.
- Published
- 2015
- Full Text
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15. Feedback for foremen
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Zamigulov, E. A., primary, Igoshina, M. L., additional, and Shafigullin, R. R., additional
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- 2022
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16. Rational placement and required number of information unmanned aerial systems for on-line monitoring of large territories
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Moiseev, V. S., Gushchina, D. S., and Shafigullin, R. R.
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- 2012
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17. A prototype of the FPGA-based nanosecond trigger
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Dobrotvorskii, A. S., Karpukhin, V. S., and Shafigullin, R. R.
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- 2010
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18. Production of $ \rightarrow$ 3HeX reaction at 1360 and 1450 MeV
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Schönning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, H., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P. -E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Złomanczuk, J.
- Published
- 2010
- Full Text
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19. Tagging of η mesons using the pd → 3Heη reaction near threshold
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Bargholtz, Chr., Gerén, L., Grebenev, V. N., Gurov, Yu. B., Karpukhin, V. S., Laukhin, I. V., Martem’yanov, B. V., Matveev, V. A., Lindberg, K., Sopov, V. S., Tegnér, P. -E., Chernyshev, B. A., Shafigullin, R. R., and Zartova, I.
- Published
- 2006
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20. A spectrometer for seeking exotic states of pionic atoms of xenon
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Bargholtz, Chr., Gerén, L., Grebenev, V. N., Gurov, Yu. B., Karpukhin, V. S., Laukhin, I. V., Lindberg, K., Sandukovsky, V. G., Tegnér, P. -E., Chernyshev, B. A., and Shafigullin, R. R.
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- 2006
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21. A search for deeply bound pionic states of xenon produced in the 136Xe(d, 3He)135Xeπ-bound reaction
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Bargholtz, Chr., Chernyshev, B. A., Gerén, L., Grebenev, V. N., Guro, Yu. B., Höistad, B., Laukhin, I. V., Lindberg, K., Sandukovsky, V. G., Shafigullin, R. R., and Tegnér, P. -E.
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- 2005
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22. The observation of deeply bound pionic states of xenon produced in the d + Xe nat → Xe π−bound + 3He reaction
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Andersson, M., Bargholtz, Chr., Chernyshev, B., Gerén, L., Gornov, M., Grebenev, V., Gurov, Y., Höistad, B., Sandukovsky, V., Shafigullin, R., Tegnér, P.-E., and Wilhelmsen Rolander, K.
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- 2003
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23. Protective Characteristics of Enclosing Structures Exposed to Electromagnetic Radiation
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Kupriyanov, V N, primary and Shafigullin, R I, additional
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- 2018
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24. The pd→He3ηπ0 reaction at Tp=1450 MeV
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Schönning, K., Bargholtz, Chr., Bashkanov, M., Berłowski, M., Bogoslawsky, D., Calén, H., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupść, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P.-E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Złomańczuk, J.
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Nuclear and High Energy Physics - Published
- 2010
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25. Termosyphon cryogenic system for RED-100 detector
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Sosnovtsev, V, primary, Tolstukhin, I, additional, Shakirov, A, additional, and Shafigullin, R, additional
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- 2016
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26. RED-100 detector for the first observation of the elastic coherent neutrino scattering off xenon nuclei
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Akimov, D Yu, primary, Berdnikova, A K, additional, Belov, V A, additional, Bolozdynya, A I, additional, Burenkov, A A, additional, Efremenko, Yu V, additional, Gusakov, Yu V, additional, Etenko, A V, additional, Kaplin, V A, additional, Khromov, A V, additional, Konovalov, A M, additional, Kovalenko, A G, additional, Kozlova, E S, additional, Kumpan, A V, additional, Krakhmalova, T D, additional, Melikyan, Yu A, additional, Naumov, P P, additional, Rudik, D G, additional, Shafigullin, R R, additional, Shakirov, A V, additional, Simakov, G E, additional, Sosnovtsev, V V, additional, Stekhanov, V N, additional, Tobolkin, A A, additional, and Tolstukhin, I A, additional
- Published
- 2016
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27. The pd --> ^3He eta pi0 reaction at T_p = 1450 MeV
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Schoenning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Ekstroem, C., Fransson, K., Geren, L., Gustafsson, L., Hoeistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thoerngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Subjects
ddc:530 ,Nuclear Experiment - Abstract
The cross section for the pd --> ^3He eta pi0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one ^3He and four photons from the decays of the two photons. The data indicate that the production mechanism involves the formation of the Delta(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final state particles are well reproduced by a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the pi^0 momentum in the ^3Hepi^0 system., Comment: 10 pages, 5 figures
- Published
- 2010
28. Production of the omega meson in the pd -> He-3 omega reaction at 1450 MeV and 1360 MeV
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Schonning, K., Bargholtz, C., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demirors, L., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Khemchandani, Kanchan P., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Petukhov, Y., Povtorejko, A., Ruber, Rjmy, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. E., Engblom, P. T., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections., We wish to thank the personnel at the The Svedberg Laboratory for their support during the course of the experiment. We are grateful to Y. le Bornec for providing us with information regarding Ref. [5] and also V. Shklyar for supplying the t-matrix element of the Giessen model described in Ref. [31]. This work was supported by the European Community under the “Structuring the Research Area” Specific Program Research Infrastructures Action (Hadron Physics, contract no. RII-cT-204-506078) by the Swedish Research Council, and BMBF (06TU201). K.P.K. wishes to thank the Fundacao para a Ciˆencia e a Tecnologia of the Minist´erio da Ciˆencia, Tecnologia e Ensino Superior of Portugal for financial support under Contract No. SFRH/BPD/40309/2007.
- Published
- 2009
29. Production of the meson in the pd3He reaction at 1450 MeV and 1360 MeV
- Author
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Schönning, K., Bargholtz, Chr., Geren, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Khemchandani, K., Bashkanov, M., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petren, H., Berlowski, M., Petukhov, Y., Povtorejko, A., Ruber, R., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, E., Bogoslawsky, D., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, J., Calen, H., Clement, H., Demirörs, L., Ekström, C., and Fransson, K.
- Subjects
Nuclear Theory ,ddc:530 ,Nuclear Experiment - Abstract
The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections.
- Published
- 2009
30. Measurement of eta meson decays into lepton-antilepton pairs
- Author
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WASA Collaboration, Ber��owski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Cal��n, H., Cappellaro, F., Clement, H., Demir��rs, L., Ekstr��m, C., Fransson, K., Ger��n, L., Gustafsson, L., H��istad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kup����, A., Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Sch��nning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegn��r, P. -E., Engblom, P. Th��rngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Z��oma��czuk, J.
- Subjects
Nuclear and High Energy Physics ,Particle physics ,Meson ,Nuclear Theory ,decay modes [eta] ,Dalitz plot ,FOS: Physical sciences ,Electron ,Particle identification ,exclusive reaction [p deuteron] ,High Energy Physics - Experiment ,Nuclear physics ,Particle decay ,High Energy Physics - Experiment (hep-ex) ,pair production [lepton] ,+helium-3+eta%22">p deuteron --> helium-3 eta ,+2lepton%2B+2lepton%22">eta --> 2lepton+ 2lepton ,ddc:530 ,+2positron+2electron%22">eta --> 2positron 2electron ,semileptonic decay [eta] ,Nuclear Experiment ,0.893 GeV ,+pi%2B+pi-+muon%2B+muon%22">eta --> pi+ pi- muon+ muon ,branching ratio [eta] ,Physics ,hadroproduction [eta] ,experimental results [magnetic spectrometer] ,leptonic decay [eta] ,Branching fraction ,High Energy Physics::Phenomenology ,Eta meson ,+positron+electron%22">eta --> positron electron ,Uppsala CELSIUS Stor ,+2muon%2B+2muon%22">eta --> 2muon+ 2muon ,High Energy Physics::Experiment ,+positron+electron+photon%22">eta --> positron electron photon ,upper limit ,Lepton ,experimental results - Abstract
A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4., 9 pages, 10 Postscript figures, uses revtex4.sty, revised version after referee comments; conclusions unchanged
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- 2007
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31. Measurement of the eta->pi+pi-e+e- decay branching ratio
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Bargholtz, C., Bashkanov, M., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupsc, A., Bogoslawsky, D., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Calen, H., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Cappellaro, F., Tegner, P. E., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, J., Clement, H., CELSIUS-WASA, Coll., Demirörs, L., Ekström, C., Fransson, K., and Geren, L.
- Subjects
hadroproduction [eta] ,dalitz decays ,0.893 GeV-kin ,exclusive reaction [p deuteron] ,(pi+ pi- positron electron) [mass spectrum] ,Uppsala CELSIUS Stor ,High Energy Physics - Experiment ,pair production [pi] ,+helium-3+eta%22">p deuteron --> helium-3 eta ,ddc:530 ,High Energy Physics::Experiment ,pair production [electron] ,eta meson decays ,semileptonic decay [eta] ,+pi%2B+pi-+positron+electron%22">eta --> pi+ pi- positron electron ,experimental results [magnetic detector] ,Nuclear Experiment ,Astrophysics::Galaxy Astrophysics ,branching ratio [eta] - Abstract
The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., Comment: 10 pages,6 figures revised version
- Published
- 2006
32. Measurement of the eta->pi+pi-e+e- decay branching ratio
- Author
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WASA Collaboration, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Cal��n, H., Capellaro, F., Clement, H., Demir��rs, L., Ekstr��m, C., Fransson, K., Ger��n, L., Gustafsson, L., H��istad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupsc, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Sch��nning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegn��r, P. -E., Engblom, P. Th��rngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Z��oma��czuk, J.
- Subjects
High Energy Physics - Experiment (hep-ex) ,FOS: Physical sciences ,High Energy Physics::Experiment ,Nuclear Experiment ,Astrophysics::Galaxy Astrophysics - Abstract
The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., 10 pages,6 figures revised version
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- 2006
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33. Improvement to Wellbore Stability while Drilling Challenging Profile Wells in the Vankor Field
- Author
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Kharitonov, A.., additional, Burdukovsky, R.., additional, Semenikhin, I.., additional, Pogorelova, S.., additional, Sidubaev, S.., additional, and Shafigullin, R.., additional
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- 2014
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34. Improvement to Wellbore Stability while Drilling Challenging Profile Wells in the Vankor Field (Russian)
- Author
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Kharitonov, A., primary, Burdukovsky, R., additional, Semenikhin, I., additional, Pogorelova, S., additional, Sidubaev, S., additional, and Shafigullin, R., additional
- Published
- 2014
- Full Text
- View/download PDF
35. The pd →3Heηπ0 reaction at Tp = 1450 MeV
- Author
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Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demirors, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimowa, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P.-E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demirors, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimowa, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P.-E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Abstract
The cross section for the pd→3Heηπ0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one 3He and four photons from the decays of the two mesons. The data indicate that the production mechanism involves the formation of the Δ(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final particles are well reproduce dby a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the π0 momentum in the 3He π0 system.
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- 2010
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36. Production of eta and 3 pi mesons in the pd -> (HeX)-He-3 reaction at 1360 and 1450 MeV
- Author
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Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Abstract
The cross-sections of the pd -> He-3 eta, pd -> He-3 pi(0)pi(0)pi(0) and pd -> He-3 pi(+)pi(-)pi(0) reactions have been measured at the beam kinetic energies T-p = 1360 MeV and T-p = 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section d sigma/d Omega of the eta meson in the pd -> He-3 eta reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd -> He-3 pi(+)pi(-)pi(0) and pd -> He-3 pi(0)pi(0)pi(0) cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the pi pi, He-3 pi and (3)He2 pi systems provide hints on the role of nucleon resonances in the 3 pi production process.
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- 2010
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37. Production of the omega meson in the pd -> He-3 omega reaction at 1450 MeV and 1360 MeV
- Author
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Schönning, Karin, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calen, H, Clement, H, Demiroers, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Khemchandani, P, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrén, H, Petukhov, Y, Povtorejko, A, Ruber, R. J. M. Y., Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Thörngren Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, Zlomanczuk, J, Schönning, Karin, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calen, H, Clement, H, Demiroers, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Khemchandani, P, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrén, H, Petukhov, Y, Povtorejko, A, Ruber, R. J. M. Y., Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Thörngren Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, and Zlomanczuk, J
- Abstract
The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections.
- Published
- 2009
- Full Text
- View/download PDF
38. Exclusive measurement of two-pion production in the dd -> He-4 pi pi reaction
- Author
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Keleta, S, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calèn, H, Clement, H, Demirors, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrèn, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, R. J. M. Y., Schönning, K, Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Engblom, Thorngren, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, Zlomanczuk, J, Keleta, S, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calèn, H, Clement, H, Demirors, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrèn, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, R. J. M. Y., Schönning, K, Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Engblom, Thorngren, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, and Zlomanczuk, J
- Abstract
The results from the first kinematically complete measurement of the dd -> He-4 pi pi reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar pi pi-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV. with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low pi pi-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, Our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NN -> d pi sub-processes. (C) 2009 Elsevier B.V. All rights reserved.
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- 2009
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39. Polarisation of the omega meson in the pd -> He-3 omega reaction at 1360 and 1450 MeV
- Author
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Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Abstract
The tensor polarisation of omega mesons produced in the pd -> He-3 omega reaction has been studied at two energies near threshold. The 3 He nuclei were detected in coincidence with the pi(0)pi(+)pi(-) or pi(0)gamma decay products of the omega. in contrast to the case of phi-meson production, the omega mesons are found to be unpolarised. This brings into question the applicability of the Okubo-Zweig-lizuka rule when comparing the production of vector mesons in low energy hadronic reactions.
- Published
- 2008
- Full Text
- View/download PDF
40. Measurement of eta meson decays into lepton-antilepton pairs
- Author
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Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Abstract
A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta -> e(+)e(-)e(+)e(-) events are reported with a background of 1.3 +/- 0.2 events. This allows to set an upper limit to the branching ratio of 9.7x10(-5) (90% CL). The branching ratio for the decay eta -> e(+)e(-)gamma is determined to (7.8 +/- 0.5(stat)+/- 0.8(syst))x10(-3) in agreement with world average value. An upper limit (90% CL) for the branching ratio for the eta -> e(+)e(-) decay is 2.7x10(-5) and a limit for the sum of the eta ->mu(+)mu(-)mu(+)mu(-) and eta ->pi(+)pi(-)mu(+)mu(-) decays is 3.6x10(-4).
- Published
- 2008
- Full Text
- View/download PDF
41. Measurement of the eta -> pi(+)pi(-)e(+)e(-) decay branching ratio
- Author
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Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
- Abstract
The reaction pd -> He-3 eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta -> pi(+)pi(-)e(+)e(-) is measured to be (4.3 +/- 1.3 +/- 0.4) x 10(-4).
- Published
- 2007
- Full Text
- View/download PDF
42. Properties of the WASA pellet target and a stored intermediate-energy beam
- Author
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Bargholtz, Chr., Geren, L., Kupsc, Andrzej, Laukhin, I. V., Lindberg, K., Shafigullin, R .R., Tegner, P. -E., Zartova, I., Bargholtz, Chr., Geren, L., Kupsc, Andrzej, Laukhin, I. V., Lindberg, K., Shafigullin, R .R., Tegner, P. -E., and Zartova, I.
- Abstract
Experimental data from the reaction close to threshold have been used to investigate time-dependent properties of the WASA pellet target and the stored beam of 892.8 MeV protons in the CELSIUS accelerator. The detection of 3He ions in solid-state detectors provides an excellent almost background free trigger for η production. Pellet interactions with the surrounding material and with the beam lead to evaporation of deuterium gas into the beam pipe. Approximately 30% of the registered η decay events are due to interactions in deuterium gas outside the pellets. Due to beam–target interaction the beam is transversely heated and appears to acquire a component of a slightly lower energy.
- Published
- 2007
- Full Text
- View/download PDF
43. The Observation of Deeply Bound Pionic States of Xenon Produced in d + AXe -> A-1Xepi + 3He Reactions at CELSIUS
- Author
-
Andersson, M., Bargholtz, Christoph, Chernyshev, B., Gerén, L., Gornov, M., Grebenev, V., Gurov, Y., Höistad, Bo, Sandukovski, V., Shafigullin, R., Tegner, Per-Erik, and Wilhelmsen Rolander, Katarina, Andersson, M., Bargholtz, Christoph, Chernyshev, B., Gerén, L., Gornov, M., Grebenev, V., Gurov, Y., Höistad, Bo, Sandukovski, V., Shafigullin, R., Tegner, Per-Erik, and and Wilhelmsen Rolander, Katarina
- Published
- 2003
44. Observation of Deeply Bound Pionic States of Xenon Produced in Xenat(d, 3He)Xepi-bound Reactions
- Author
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Andersson, M., Bargholtz, Christoph, Chernyshev, B., Gerén, L., Gornov, M., Grebenev, V., Gurov, Y., Höistad, Bo, Sandukovski, V., Shafigullin, R., Tegner, Per-Erik, and Wilhelmsen Rolander, Katarina, Andersson, M., Bargholtz, Christoph, Chernyshev, B., Gerén, L., Gornov, M., Grebenev, V., Gurov, Y., Höistad, Bo, Sandukovski, V., Shafigullin, R., Tegner, Per-Erik, and and Wilhelmsen Rolander, Katarina
- Published
- 2003
45. Search for deeply bound pionic atoms with high-purity germanium tagging spectrometer
- Author
-
Chernyshev, B A, Dovgun, S V, Gornov, M G, Grebenev, V N, Gurov, Yu B, Katulina, S L, Sandukovsky, V G, and Shafigullin, R R
- Subjects
Other Fields of Physics - Published
- 1994
46. Production of $ \eta$ and 3$ \pi$ mesons in the pd $ \rightarrow$ 3HeX reaction at 1360 and 1450 MeV
- Author
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Schönning, K., primary, Bargholtz, Chr., additional, Bashkanov, M., additional, Berlowski, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demirörs, L., additional, Ekström, C., additional, Fransson, K., additional, Gerén, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Keleta, S., additional, Khakimova, O., additional, Kren, F., additional, Kullander, S., additional, Kupsc, A., additional, Kuzmin, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Morosov, B., additional, Oelert, W., additional, Pauly, C., additional, Petrén, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Scobel, W., additional, Shafigullin, R., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepaniak, J., additional, Tegnér, P. -E., additional, Thörngren Engblom, P., additional, Tikhomirov, V., additional, Turowiecki, A., additional, Wagner, G. J., additional, Wolke, M., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomanczuk, J., additional
- Published
- 2010
- Full Text
- View/download PDF
47. Exclusive measurement of two-pion production in the reaction
- Author
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Keleta, S., primary, Bargholtz, Chr., additional, Bashkanov, M., additional, Berłowski, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demirörs, L., additional, Ekström, C., additional, Fransson, K., additional, Gerén, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Khakimova, O., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Kuzmin, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Morosov, B., additional, Oelert, W., additional, Pauly, C., additional, Petrén, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Pricking, A., additional, Ruber, R.J.M.Y., additional, Schönning, K., additional, Scobel, W., additional, Shafigullin, R., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepaniak, J., additional, Tegnér, P.-E., additional, Engblom, P. Thörngren, additional, Tikhomirov, V., additional, Turowiecki, A., additional, Wagner, G.J., additional, Wilkin, C., additional, Wolke, M., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomańczuk, J., additional
- Published
- 2009
- Full Text
- View/download PDF
48. Production of the ω meson in thepd→He3ωreaction at 1450 MeV and 1360 MeV
- Author
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Schönning, K., primary, Bargholtz, Chr., additional, Bashkanov, M., additional, Berłowski, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demirörs, L., additional, Ekström, C., additional, Fransson, K., additional, Gerén, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Keleta, S., additional, Khakimova, O., additional, Khemchandani, K. P., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Kuzmin, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Morosov, B., additional, Oelert, W., additional, Pauly, C., additional, Petrén, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Ruber, R. J. M. Y., additional, Scobel, W., additional, Shafigullin, R., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepaniak, J., additional, Tegnér, P.-E., additional, Engblom, P. Thörngren, additional, Tikhomirov, V., additional, Turowiecki, A., additional, Wagner, G. J., additional, Wilkin, C., additional, Wolke, M., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomańczuk, J., additional
- Published
- 2009
- Full Text
- View/download PDF
49. Measurement of the [formula omitted] decay branching ratio
- Author
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Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, H., Cappellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupść, A., Kuznetsov, A., Laukhin, I.V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegnér, P.-E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.
- Published
- 2007
- Full Text
- View/download PDF
50. Polarisation of the ω meson in the pd→He3ω reaction at 1360 and 1450 MeV
- Author
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Schönning, K., primary, Bargholtz, Chr., additional, Bashkanov, M., additional, Berłowski, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demirörs, L., additional, Ekström, C., additional, Fransson, K., additional, Gerén, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Keleta, S., additional, Khakimova, O., additional, Koch, I., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Kuzmin, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Morosov, B., additional, Oelert, W., additional, Pauly, C., additional, Pettersson, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Ruber, R.J.M.Y., additional, Scobel, W., additional, Shafigullin, R., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepaniak, J., additional, Tegnér, P.-E., additional, Engblom, P. Thörngren, additional, Tikhomirov, V., additional, Turowiecki, A., additional, Wagner, G.J., additional, Wilkin, C., additional, Wolke, M., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomańczuk, J., additional
- Published
- 2008
- Full Text
- View/download PDF
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