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87 results on '"Gustafsson, Leif"'

1. Effects of proton irradiation on 60 GHz CMOS transceiver chip for multi-Gbps communication in high-energy physics experiments

Author: Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, Brenner, Richard, Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, and Brenner, Richard
Abstract: This article presents the experimental results of 17 MeV proton irradiation on a 60 GHz low power, half-duplex transceiver (TRX) chip implemented in 65 nm CMOS technology. It supports short range point-to-point data rate up to 6 Gbps by employing on-off keying (OOK). To investigate the irradiation hardness for high-energy physics (HEP) applications, two TRX chips were irradiated with total ionising doses (TID) of 74 and 42 kGy and fluence of 1.4 x 10(14)N(eq)/cm(2) and 0.8 x 10(14)N(eq)/cm(2) for RX and TX modes, respectively. The chips were characterised by pre- and post-irradiation analogue voltage measurements on different circuit blocks as well as through the analysis of wireless transmission parameters like bit error rate (BER), eye diagram, jitter etc. Post-irradiation measurements have shown certain reduction in performance but both TRX chips have been found operational through over the air measurements at 5 Gbps. Moreover, very small shift in the carrier frequency was observed after the irradiation.
Published: 2019
Full Text: View/download PDF

2. Effects of proton irradiation on 60 GHz CMOS transceiver chip for multi-Gbps communication in high-energy physics experiments

Author: Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, Brenner, Richard, Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, and Brenner, Richard
Abstract: This article presents the experimental results of 17 MeV proton irradiation on a 60 GHz low power, half-duplex transceiver (TRX) chip implemented in 65 nm CMOS technology. It supports short range point-to-point data rate up to 6 Gbps by employing on-off keying (OOK). To investigate the irradiation hardness for high-energy physics (HEP) applications, two TRX chips were irradiated with total ionising doses (TID) of 74 and 42 kGy and fluence of 1.4 x 10(14)N(eq)/cm(2) and 0.8 x 10(14)N(eq)/cm(2) for RX and TX modes, respectively. The chips were characterised by pre- and post-irradiation analogue voltage measurements on different circuit blocks as well as through the analysis of wireless transmission parameters like bit error rate (BER), eye diagram, jitter etc. Post-irradiation measurements have shown certain reduction in performance but both TRX chips have been found operational through over the air measurements at 5 Gbps. Moreover, very small shift in the carrier frequency was observed after the irradiation.
Published: 2019
Full Text: View/download PDF

3. Effects of proton irradiation on 60 GHz CMOS transceiver chip for multi-Gbps communication in high-energy physics experiments

Author: Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, Brenner, Richard, Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, and Brenner, Richard
Abstract: This article presents the experimental results of 17 MeV proton irradiation on a 60 GHz low power, half-duplex transceiver (TRX) chip implemented in 65 nm CMOS technology. It supports short range point-to-point data rate up to 6 Gbps by employing on-off keying (OOK). To investigate the irradiation hardness for high-energy physics (HEP) applications, two TRX chips were irradiated with total ionising doses (TID) of 74 and 42 kGy and fluence of 1.4 x 10(14)N(eq)/cm(2) and 0.8 x 10(14)N(eq)/cm(2) for RX and TX modes, respectively. The chips were characterised by pre- and post-irradiation analogue voltage measurements on different circuit blocks as well as through the analysis of wireless transmission parameters like bit error rate (BER), eye diagram, jitter etc. Post-irradiation measurements have shown certain reduction in performance but both TRX chips have been found operational through over the air measurements at 5 Gbps. Moreover, very small shift in the carrier frequency was observed after the irradiation.
Published: 2019
Full Text: View/download PDF

4. Effects of proton irradiation on 60 GHz CMOS transceiver chip for multi-Gbps communication in high-energy physics experiments

Author: Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, Brenner, Richard, Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, and Brenner, Richard
Abstract: This article presents the experimental results of 17 MeV proton irradiation on a 60 GHz low power, half-duplex transceiver (TRX) chip implemented in 65 nm CMOS technology. It supports short range point-to-point data rate up to 6 Gbps by employing on-off keying (OOK). To investigate the irradiation hardness for high-energy physics (HEP) applications, two TRX chips were irradiated with total ionising doses (TID) of 74 and 42 kGy and fluence of 1.4 x 10(14)N(eq)/cm(2) and 0.8 x 10(14)N(eq)/cm(2) for RX and TX modes, respectively. The chips were characterised by pre- and post-irradiation analogue voltage measurements on different circuit blocks as well as through the analysis of wireless transmission parameters like bit error rate (BER), eye diagram, jitter etc. Post-irradiation measurements have shown certain reduction in performance but both TRX chips have been found operational through over the air measurements at 5 Gbps. Moreover, very small shift in the carrier frequency was observed after the irradiation.
Published: 2019
Full Text: View/download PDF

5. Effects of proton irradiation on 60 GHz CMOS transceiver chip for multi-Gbps communication in high-energy physics experiments

Author: Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, Brenner, Richard, Aziz, Imran, Dancila, Dragos, Dittmeier, Sebastian, Siligaris, Alexandre, Dehos, Cedric, De Lurgio, Patrik Martin, Djurcic, Zelimir, Drake, Gary, Jimenez, Jose Luis Gonzalez, Gustafsson, Leif, Kim, Don-Won, Locci, Elizabeth, Pfeiffer, Ulrich, Vazquez, Pedro Rodriquez, Rohrich, Dieter, Schoening, Andre, Soltveit, Hans Kristian, Ullaland, Kjetil, Vincent, Pierre, Yang, Shiming, and Brenner, Richard
Abstract: This article presents the experimental results of 17 MeV proton irradiation on a 60 GHz low power, half-duplex transceiver (TRX) chip implemented in 65 nm CMOS technology. It supports short range point-to-point data rate up to 6 Gbps by employing on-off keying (OOK). To investigate the irradiation hardness for high-energy physics (HEP) applications, two TRX chips were irradiated with total ionising doses (TID) of 74 and 42 kGy and fluence of 1.4 x 10(14)N(eq)/cm(2) and 0.8 x 10(14)N(eq)/cm(2) for RX and TX modes, respectively. The chips were characterised by pre- and post-irradiation analogue voltage measurements on different circuit blocks as well as through the analysis of wireless transmission parameters like bit error rate (BER), eye diagram, jitter etc. Post-irradiation measurements have shown certain reduction in performance but both TRX chips have been found operational through over the air measurements at 5 Gbps. Moreover, very small shift in the carrier frequency was observed after the irradiation.
Published: 2019
Full Text: View/download PDF

6. The IceCube Neutrino Observatory : instrumentation and online systems

Author: Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Archinger, M., Arguelles, C., Auer, R., Auffenberg, J., Axani, S., Baccus, J., Bai, X., Barnet, S., Barwick, S. W., Baum, V., Bay, R., Beattie, K., Beatty, J. J., Tjus, J. Becker, Becker, K. -H, Bendfelt, T., BenZvi, S., Berley, D., Bernardini, E., Bernhard, A., Besson, D. Z., Binder, G., Bindig, D., Bissok, M., Blaufuss, E., Blot, S., Boersma, David J., Bohm, C., Boerner, M., Bos, F., Bose, D., Boeser, S., Botner, Olga, Bouchta, Adam, Braun, J., Brayeur, L., Bretz, H. -P, Bron, S., Burgman, Alexander, Burreson, C., Carver, T., Casier, M., Cheung, E., Chirkin, D., Christov, A., Clark, K., Classen, L., Coenders, S., Collin, G. H., Conrad, J. M., Cowen, D. F., Cross, R., Day, C., Day, M., de Andre, J. P. A. M., De Clercq, C., Rosendo, E. del Pino, Dembinski, H., De Ridder, S., Descamps, F., Desiati, P., de Vries, K. D., de Wasseige, G., de With, M., DeYoung, T., Diaz-Velez, J. C., di Lorenzo, V., Dujmovic, H., Dumm, J. P., Dunkman, M., Eberhardt, B., Edwards, W. R., Ehrhardt, T., Eichmann, B., Eller, P., Euler, Sebastian, Evenson, P. A., Fahey, S., Fazely, A. R., Feintzeig, J., Felde, J., Filimonov, K., Finley, C., Flis, S., Foesig, C. -C, Franckowiak, A., Frere, M., Friedman, E., Fuchs, T., Gaisser, T. K., Gallagher, J., Gerhardt, L., Ghorbani, K., Giang, W., Gladstone, L., Glauch, T., Glowacki, D., Gluesenkamp, T., Goldschmidt, A., Gonzalez, J. G., Grant, D., Griffith, Z., Gustafsson, Leif, Haack, C., Hallgren, Allan, Halzen, F., Hansen, E., Hansmann, T., Hanson, K., Haugen, J., Hebecker, D., Heereman, D., Helbing, K., Hellauer, R., Heller, R., Hickford, S., Hignight, J., Hill, G. C., Hoffman, K. D., Hoffmann, R., Hoshina, K., Huang, F., Huber, M., Hulth, P. O., Hultqvist, K., In, S., Inaba, M., Ishihara, A., Jacobi, E., Jacobsen, J., Japaridze, G. S., Jeong, M., Jero, K., Jones, A., Jones, B. J. P., Joseph, J., Kang, W., Kappes, A., Karg, T., Karle, A., Katz, U., Kauer, M., Keivani, A., Kelley, J. L., Kemp, J., Kheirandish, A., Kim, J., Kim, M., Kintscher, T., Kiryluk, J., Kitamura, N., Kittler, T., Klein, S. R., Kleinfelder, S., Kleist, M., Kohnen, G., Koirala, R., Kolanoski, H., Konietz, R., Koepke, L., Kopper, C., Kopper, S., Koskinen, D. J., Kowalski, M., Krasberg, M., Krings, K., Kroll, M., Krueckl, G., Kruger, C., Kunnen, J., Kunwar, S., Kurahashi, N., Kuwabara, T., Labare, M., Laihem, K., Landsman, H., Lanfranchi, J. L., Larson, M. J., Lauber, F., Laundrie, A., Lennarz, D., Leich, H., Lesiak-Bzdak, M., Leuermann, M., Lu, L., Ludwig, J., Lunemann, J., Mackenzie, C., Madsen, J., Maggi, G., Mahn, K. B. M., Mancina, S., Mandelartz, M., Maruyama, R., Mase, K., Matis, H., Maunu, R., McNally, F., McParland, C. P., Meade, P., Meagher, K., Medici, M., Meier, M., Meli, A., Menne, T., Merino, G., Meures, T., Miarecki, S., Minor, R. H., Montaruli, T., Moulai, M., Murray, T., Nahnhauer, R., Naumann, U., Neer, G., Newcomb, M., Niederhausen, H., Nowicki, S. C., Nygren, D. R., Pollmann, A. Obertacke, Olivas, A., O'Murchadha, A., Palczewski, T., Pandya, H., Pankova, D. V., Patton, S., Peiffer, P., Penek, O., Pepper, J. A., de los Heros, Carlos, Pettersen, C., Pieloth, D., Pinat, E., Price, P. B., Przybylski, G. T., Quinnan, M., Raab, C., Raedel, L., Rameez, M., Rawlins, K., Reimann, R., Relethford, B., Relich, M., Resconi, E., Rhode, W., Richman, M., Riedel, B., Robertson, S., Rongen, M., Roucelle, C., Rott, C., Ruhe, T., Ryckbosch, D., Rysewyk, D., Sabbatini, L., Herrera, S. E. Sanchez, Sandrock, A., Sandroos, J., Sandstrom, P., Sarkar, S., Satalecka, K., Schlunder, P., Schmidt, T., Schoenen, S., Schoeneberg, S., Schukraft, A., Schumacher, L., Seckel, D., Seunarine, S., Solarz, M., Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stanev, T., Stasik, A., Stettner, J., Steuer, A., Stezelberger, T., Stokstad, R. G., Stoessl, A., Ström, Rickard, Strotjohann, N. L., Sulanke, K. -H, Sullivan, G. W., Sutherland, M., Taavola, Henric, Taboada, I., Tatar, J., Tenholt, F., Ter-Antonyan, S., Terliuk, A., Tesic, G., Thollander, L., Tilav, S., Toale, P. A., Tobin, M. N., Toscano, S., Tosi, D., Tselengidou, M., Turcati, A., Unger, Elisabeth, Usner, M., Vandenbroucke, J., van Eijndhoven, N., Vanheule, S., van Rossem, M., van Santen, J., Vehring, M., Voge, M., Vogel, E., Vraeghe, M., Wahl, D., Walck, C., Wallace, A., Wallraff, M., Wandkowsky, N., Weaver, Ch., Weiss, M. J., Wendt, C., Westerhoff, S., Wharton, D., Whelan, B. J., Wickmann, S., Wiebe, K., Wiebusch, C. H., Wille, L., Williams, D. R., Wills, L., Wisniewski, P., Wolf, M., Wood, T. R., Woolsey, E., Woschnagg, K., Xu, D. L., Xu, X. W., Xu, Y., Yanez, J. P., Yodh, G., Yoshida, S., Zoll, M., Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Archinger, M., Arguelles, C., Auer, R., Auffenberg, J., Axani, S., Baccus, J., Bai, X., Barnet, S., Barwick, S. W., Baum, V., Bay, R., Beattie, K., Beatty, J. J., Tjus, J. Becker, Becker, K. -H, Bendfelt, T., BenZvi, S., Berley, D., Bernardini, E., Bernhard, A., Besson, D. Z., Binder, G., Bindig, D., Bissok, M., Blaufuss, E., Blot, S., Boersma, David J., Bohm, C., Boerner, M., Bos, F., Bose, D., Boeser, S., Botner, Olga, Bouchta, Adam, Braun, J., Brayeur, L., Bretz, H. -P, Bron, S., Burgman, Alexander, Burreson, C., Carver, T., Casier, M., Cheung, E., Chirkin, D., Christov, A., Clark, K., Classen, L., Coenders, S., Collin, G. H., Conrad, J. M., Cowen, D. F., Cross, R., Day, C., Day, M., de Andre, J. P. A. M., De Clercq, C., Rosendo, E. del Pino, Dembinski, H., De Ridder, S., Descamps, F., Desiati, P., de Vries, K. D., de Wasseige, G., de With, M., DeYoung, T., Diaz-Velez, J. C., di Lorenzo, V., Dujmovic, H., Dumm, J. P., Dunkman, M., Eberhardt, B., Edwards, W. R., Ehrhardt, T., Eichmann, B., Eller, P., Euler, Sebastian, Evenson, P. A., Fahey, S., Fazely, A. R., Feintzeig, J., Felde, J., Filimonov, K., Finley, C., Flis, S., Foesig, C. -C, Franckowiak, A., Frere, M., Friedman, E., Fuchs, T., Gaisser, T. K., Gallagher, J., Gerhardt, L., Ghorbani, K., Giang, W., Gladstone, L., Glauch, T., Glowacki, D., Gluesenkamp, T., Goldschmidt, A., Gonzalez, J. G., Grant, D., Griffith, Z., Gustafsson, Leif, Haack, C., Hallgren, Allan, Halzen, F., Hansen, E., Hansmann, T., Hanson, K., Haugen, J., Hebecker, D., Heereman, D., Helbing, K., Hellauer, R., Heller, R., Hickford, S., Hignight, J., Hill, G. C., Hoffman, K. D., Hoffmann, R., Hoshina, K., Huang, F., Huber, M., Hulth, P. O., Hultqvist, K., In, S., Inaba, M., Ishihara, A., Jacobi, E., Jacobsen, J., Japaridze, G. S., Jeong, M., Jero, K., Jones, A., Jones, B. J. P., Joseph, J., Kang, W., Kappes, A., Karg, T., Karle, A., Katz, U., Kauer, M., Keivani, A., Kelley, J. L., Kemp, J., Kheirandish, A., Kim, J., Kim, M., Kintscher, T., Kiryluk, J., Kitamura, N., Kittler, T., Klein, S. R., Kleinfelder, S., Kleist, M., Kohnen, G., Koirala, R., Kolanoski, H., Konietz, R., Koepke, L., Kopper, C., Kopper, S., Koskinen, D. J., Kowalski, M., Krasberg, M., Krings, K., Kroll, M., Krueckl, G., Kruger, C., Kunnen, J., Kunwar, S., Kurahashi, N., Kuwabara, T., Labare, M., Laihem, K., Landsman, H., Lanfranchi, J. L., Larson, M. J., Lauber, F., Laundrie, A., Lennarz, D., Leich, H., Lesiak-Bzdak, M., Leuermann, M., Lu, L., Ludwig, J., Lunemann, J., Mackenzie, C., Madsen, J., Maggi, G., Mahn, K. B. M., Mancina, S., Mandelartz, M., Maruyama, R., Mase, K., Matis, H., Maunu, R., McNally, F., McParland, C. P., Meade, P., Meagher, K., Medici, M., Meier, M., Meli, A., Menne, T., Merino, G., Meures, T., Miarecki, S., Minor, R. H., Montaruli, T., Moulai, M., Murray, T., Nahnhauer, R., Naumann, U., Neer, G., Newcomb, M., Niederhausen, H., Nowicki, S. C., Nygren, D. R., Pollmann, A. Obertacke, Olivas, A., O'Murchadha, A., Palczewski, T., Pandya, H., Pankova, D. V., Patton, S., Peiffer, P., Penek, O., Pepper, J. A., de los Heros, Carlos, Pettersen, C., Pieloth, D., Pinat, E., Price, P. B., Przybylski, G. T., Quinnan, M., Raab, C., Raedel, L., Rameez, M., Rawlins, K., Reimann, R., Relethford, B., Relich, M., Resconi, E., Rhode, W., Richman, M., Riedel, B., Robertson, S., Rongen, M., Roucelle, C., Rott, C., Ruhe, T., Ryckbosch, D., Rysewyk, D., Sabbatini, L., Herrera, S. E. Sanchez, Sandrock, A., Sandroos, J., Sandstrom, P., Sarkar, S., Satalecka, K., Schlunder, P., Schmidt, T., Schoenen, S., Schoeneberg, S., Schukraft, A., Schumacher, L., Seckel, D., Seunarine, S., Solarz, M., Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stanev, T., Stasik, A., Stettner, J., Steuer, A., Stezelberger, T., Stokstad, R. G., Stoessl, A., Ström, Rickard, Strotjohann, N. L., Sulanke, K. -H, Sullivan, G. W., Sutherland, M., Taavola, Henric, Taboada, I., Tatar, J., Tenholt, F., Ter-Antonyan, S., Terliuk, A., Tesic, G., Thollander, L., Tilav, S., Toale, P. A., Tobin, M. N., Toscano, S., Tosi, D., Tselengidou, M., Turcati, A., Unger, Elisabeth, Usner, M., Vandenbroucke, J., van Eijndhoven, N., Vanheule, S., van Rossem, M., van Santen, J., Vehring, M., Voge, M., Vogel, E., Vraeghe, M., Wahl, D., Walck, C., Wallace, A., Wallraff, M., Wandkowsky, N., Weaver, Ch., Weiss, M. J., Wendt, C., Westerhoff, S., Wharton, D., Whelan, B. J., Wickmann, S., Wiebe, K., Wiebusch, C. H., Wille, L., Williams, D. R., Wills, L., Wisniewski, P., Wolf, M., Wood, T. R., Woolsey, E., Woschnagg, K., Xu, D. L., Xu, X. W., Xu, Y., Yanez, J. P., Yodh, G., Yoshida, S., and Zoll, M.
Abstract: The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy neutrino detector built into the ice at the South Pole. Construction of IceCube, the largest neutrino detector built to date, was completed in 2011 and enabled the discovery of high-energy astrophysical neutrinos. We describe here the design, production, and calibration of the IceCube digital optical module (DOM), the cable systems, computing hardware, and our methodology for drilling and deployment. We also describe the online triggering and data filtering systems that select candidate neutrino and cosmic ray events for analysis. Due to a rigorous pre-deployment protocol, 98.4% of the DOMs in the deep ice are operating and collecting data. IceCube routinely achieves a detector uptime of 99% by emphasizing software stability and monitoring. Detector operations have been stable since construction was completed, and the detector is expected to operate at least until the end of the next decade.
Published: 2017
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7. Wireless data transmission for high energy physics applications

Author: Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, Yang, Shiming, Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, and Yang, Shiming
Abstract: Silicon tracking detectors operated at high luminosity collider experiments pose a challenge for current and future readout systems regarding bandwidth, radiation, space and power constraints. With the latest developments in wireless communications, wireless readout systems might be an attractive alternative to commonly used wired optical and copper based readout architectures. The WADAPT group (Wireless Allowing Data and Power Transmission) has been formed to study the feasibility of wireless data transmission for future tracking detectors. These proceedings cover current developments focused on communication in the 60 GHz band. This frequency band offers a high bandwidth, a small form factor and an already mature technology. Motivation for wireless data transmission for high energy physics application and the developments towards a demonstrator prototype are summarized. Feasibility studies concerning the construction and operation of a wireless transceiver system have been performed. Data transmission tests with a transceiver prototype operating at even higher frequencies in the 240 GHz band are described. Data transmission at rates up to 10 Gb/s have been obtained successfully using binary phase shift keying.
Published: 2017
Full Text: View/download PDF

8. Wireless data transmission for high energy physics applications

Author: Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, Yang, Shiming, Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, and Yang, Shiming
Abstract: Silicon tracking detectors operated at high luminosity collider experiments pose a challenge for current and future readout systems regarding bandwidth, radiation, space and power constraints. With the latest developments in wireless communications, wireless readout systems might be an attractive alternative to commonly used wired optical and copper based readout architectures. The WADAPT group (Wireless Allowing Data and Power Transmission) has been formed to study the feasibility of wireless data transmission for future tracking detectors. These proceedings cover current developments focused on communication in the 60 GHz band. This frequency band offers a high bandwidth, a small form factor and an already mature technology. Motivation for wireless data transmission for high energy physics application and the developments towards a demonstrator prototype are summarized. Feasibility studies concerning the construction and operation of a wireless transceiver system have been performed. Data transmission tests with a transceiver prototype operating at even higher frequencies in the 240 GHz band are described. Data transmission at rates up to 10 Gb/s have been obtained successfully using binary phase shift keying.
Published: 2017
Full Text: View/download PDF

9. Wireless data transmission for high energy physics applications

Author: Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, Yang, Shiming, Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, and Yang, Shiming
Abstract: Silicon tracking detectors operated at high luminosity collider experiments pose a challenge for current and future readout systems regarding bandwidth, radiation, space and power constraints. With the latest developments in wireless communications, wireless readout systems might be an attractive alternative to commonly used wired optical and copper based readout architectures. The WADAPT group (Wireless Allowing Data and Power Transmission) has been formed to study the feasibility of wireless data transmission for future tracking detectors. These proceedings cover current developments focused on communication in the 60 GHz band. This frequency band offers a high bandwidth, a small form factor and an already mature technology. Motivation for wireless data transmission for high energy physics application and the developments towards a demonstrator prototype are summarized. Feasibility studies concerning the construction and operation of a wireless transceiver system have been performed. Data transmission tests with a transceiver prototype operating at even higher frequencies in the 240 GHz band are described. Data transmission at rates up to 10 Gb/s have been obtained successfully using binary phase shift keying.
Published: 2017
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10. The full potential of continuous system simulation modelling

Author: Gustafsson, Leif, Sternad, Mikael, Gustafsson, E, Gustafsson, Leif, Sternad, Mikael, and Gustafsson, E
Published: 2017

11. Wireless data transmission for high energy physics applications

Author: Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, Yang, Shiming, Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, and Yang, Shiming
Abstract: Silicon tracking detectors operated at high luminosity collider experiments pose a challenge for current and future readout systems regarding bandwidth, radiation, space and power constraints. With the latest developments in wireless communications, wireless readout systems might be an attractive alternative to commonly used wired optical and copper based readout architectures. The WADAPT group (Wireless Allowing Data and Power Transmission) has been formed to study the feasibility of wireless data transmission for future tracking detectors. These proceedings cover current developments focused on communication in the 60 GHz band. This frequency band offers a high bandwidth, a small form factor and an already mature technology. Motivation for wireless data transmission for high energy physics application and the developments towards a demonstrator prototype are summarized. Feasibility studies concerning the construction and operation of a wireless transceiver system have been performed. Data transmission tests with a transceiver prototype operating at even higher frequencies in the 240 GHz band are described. Data transmission at rates up to 10 Gb/s have been obtained successfully using binary phase shift keying.
Published: 2017
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12. Wireless data transmission for high energy physics applications

Author: Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, Yang, Shiming, Dittmeier, Sebastian, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Rydberg, Anders, and Yang, Shiming
Abstract: Silicon tracking detectors operated at high luminosity collider experiments pose a challenge for current and future readout systems regarding bandwidth, radiation, space and power constraints. With the latest developments in wireless communications, wireless readout systems might be an attractive alternative to commonly used wired optical and copper based readout architectures. The WADAPT group (Wireless Allowing Data and Power Transmission) has been formed to study the feasibility of wireless data transmission for future tracking detectors. These proceedings cover current developments focused on communication in the 60 GHz band. This frequency band offers a high bandwidth, a small form factor and an already mature technology. Motivation for wireless data transmission for high energy physics application and the developments towards a demonstrator prototype are summarized. Feasibility studies concerning the construction and operation of a wireless transceiver system have been performed. Data transmission tests with a transceiver prototype operating at even higher frequencies in the 240 GHz band are described. Data transmission at rates up to 10 Gb/s have been obtained successfully using binary phase shift keying.
Published: 2017
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13. A guide to population modelling for simulation

Author: Gustafsson, Leif, Sternad, Mikael, Gustafsson, Leif, and Sternad, Mikael
Published: 2016
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14. A first search for cosmogenic neutrinos with the ARIANNA Hexagonal Radio Array

Author: Barwick, S. W., Berg, E. C., Besson, D. Z., Binder, G., Binns, W. R., Boersma, David J., Bose, R. G., Braun, D. L., Buckley, J. H., Bugaev, V., Buitink, S., Dookayka, K., Dowkontt, P. F., Duffin, T., Euler, Sebastian, Gerhardt, L., Gustafsson, Leif, Hallgren, Allan, Hanson, J. C., Israel, M. H., Kiryluk, J., Klein, S. R., Kleinfelder, S., Niederhausen, H., Olevitch, M. A., Persichelli, C., Ratzlaff, K., Rauch, B. F., Reed, C., Roumi, M., Samanta, A., Simburger, G. E., Stezelberger, T., Tatar, J., Uggerhoj, U. I., Walker, J., Yodh, G., Young, R., Barwick, S. W., Berg, E. C., Besson, D. Z., Binder, G., Binns, W. R., Boersma, David J., Bose, R. G., Braun, D. L., Buckley, J. H., Bugaev, V., Buitink, S., Dookayka, K., Dowkontt, P. F., Duffin, T., Euler, Sebastian, Gerhardt, L., Gustafsson, Leif, Hallgren, Allan, Hanson, J. C., Israel, M. H., Kiryluk, J., Klein, S. R., Kleinfelder, S., Niederhausen, H., Olevitch, M. A., Persichelli, C., Ratzlaff, K., Rauch, B. F., Reed, C., Roumi, M., Samanta, A., Simburger, G. E., Stezelberger, T., Tatar, J., Uggerhoj, U. I., Walker, J., Yodh, G., and Young, R.
Abstract: The ARIANNA experiment seeks to observe the diffuse flux of neutrinos in the 10(8)-10(10) GeV energy range using a grid of radio detectors at the surface of the Ross Ice Shelf of Antarctica. The detector measures the coherent Cherenkov radiation produced at radio frequencies, from about 100 MHz-1 GHz, by charged particle showers generated by neutrino interactions in the ice. The ARIANNA Hexagonal Radio Array (HRA) is being constructed as a prototype for the full array. During the 2013-14 austral summer, three HRA stations collected radio data which was wirelessly transmitted off site in nearly real-time. The performance of these stations is described and a simple analysis to search for neutrino signals is presented. The analysis employs a set of three cuts that reject background triggers while preserving 90% of simulated cosmogenic neutrino triggers. No neutrino candidates are found in the data and a model-independent 90% confidence level Neyman upper limit is placed on the all flavor nu + (nu) over bar flux in a sliding decade-wide energy bin. The limit reaches a minimum of 1.9 x 10(-23) GeV-1 cm(-2) s(-1) sr(-1) in the 10(8.5)-10(9.5) GeV energy bin. Simulations of the performance of the full detector are also described. The sensitivity of the full ARIANNA experiment is presented and compared with current neutrino flux models.
Published: 2015
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15. Wireless data transfer with mm-waves for future tracking detectors

Author: Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, and Gustafsson, Leif
Abstract: Wireless data transfer has revolutionized the consumer market for the last decade generating many products equipped with transmitters and receivers for wireless data transfer. Wireless technology opens attractive possibilities for data transfer in future tracking detectors. The reduction of wires and connectors for data links is certainly beneficial both for the material budget and the reliability of the system. An advantage of wireless data transfer is the freedom of routing signals which today is particularly complicated when bringing the data the first 50 cm out of the tracker. With wireless links intelligence can be built into a tracker by introducing communication between tracking layers within a region of interest which would allow the construction of track primitives in real time. The wireless technology used in consumer products is however not suitable for tracker readouts. The low data transfer capacity of current 5 GHz transceivers and the relatively large feature sizes of the components is a disadvantage. Due to the requirement of high data rates in tracking detectors high bandwidth is required. The frequency band around 60 GHz turns out to be a very promising candidate for data transfer in a detector system. The high baseband frequency allows for data transfer in the order of several Gbit/s. Due to the small wavelength in the mm range only small structures are needed for the transmitting and receiving electronics. The 60 GHz frequency band is a strong candidate for future WLAN applications hence components are already starting to be available on the market. Patch antennas produced on flexible Printed Circuit Board substrate that can be used for wireless communication in future trackers are presented in this article. The antennas can be connected to transceivers for data transmission/reception or be connected by wave-guides to structures capable of bringing the 60 GHz signal behind boundaries. Results on simulation and fabrication of these antennas are pr
Published: 2014
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16. Radial transfer of tracking data with wireless links

Author: Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, and Gustafsson, Leif
Published: 2014

17. Wireless data transfer with mm-waves for future tracking detectors

Author: Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, Gustafsson, Leif, Pelikan, Daniel, Bingefors, Nils, Brenner, Richard, Dancila, Dragos, and Gustafsson, Leif
Abstract: Wireless data transfer has revolutionized the consumer market for the last decade generating many products equipped with transmitters and receivers for wireless data transfer. Wireless technology opens attractive possibilities for data transfer in future tracking detectors. The reduction of wires and connectors for data links is certainly beneficial both for the material budget and the reliability of the system. An advantage of wireless data transfer is the freedom of routing signals which today is particularly complicated when bringing the data the first 50 cm out of the tracker. With wireless links intelligence can be built into a tracker by introducing communication between tracking layers within a region of interest which would allow the construction of track primitives in real time. The wireless technology used in consumer products is however not suitable for tracker readouts. The low data transfer capacity of current 5 GHz transceivers and the relatively large feature sizes of the components is a disadvantage. Due to the requirement of high data rates in tracking detectors high bandwidth is required. The frequency band around 60 GHz turns out to be a very promising candidate for data transfer in a detector system. The high baseband frequency allows for data transfer in the order of several Gbit/s. Due to the small wavelength in the mm range only small structures are needed for the transmitting and receiving electronics. The 60 GHz frequency band is a strong candidate for future WLAN applications hence components are already starting to be available on the market. Patch antennas produced on flexible Printed Circuit Board substrate that can be used for wireless communication in future trackers are presented in this article. The antennas can be connected to transceivers for data transmission/reception or be connected by wave-guides to structures capable of bringing the 60 GHz signal behind boundaries. Results on simulation and fabrication of these antennas are pr
Published: 2014

18. When can a deterministic model of a population system reveal what will happen on average?

Author: Gustafsson, Leif, Sternad, Mikael, Gustafsson, Leif, and Sternad, Mikael
Abstract: A dynamic population system is often modelled by a deterministic difference equation model to obtain average estimates. However, there is a risk of the results being distorted because unexplained (random) variations are left out and because entities in the population are described by continuous quantities of an infinitely divisible population so that irregularly occurring events are described by smooth flows. These distortions have many aspects that cannot be understood by only regarding a deterministic approach. However, the reasons why a deterministic model may behave differently and produce biased results become visible when the deterministic model is compared with a stochastic model of the same structure. This paper focuses first on demographic stochasticity, i.e. stochasticity that refers to random variations in the occurrence of events affecting the state of an individual, and investigates the consequences of omitting this by deterministic modelling. These investigations reveal that bias may be strongly influenced by the type of question to be answered and by the stopping criterion ending the analysis or simulation run. Two cases are identified where deterministic models produce unbiased state variables: (1) Dynamic systems with stable local linear dynamics produce unbiased state variables asymptotically, in the limit of large flows; and (2) linear dynamic systems produce unbiased state variables as long as all state variables remain non-negative in both the deterministic and the stochastic models. Both cases also require the question under study to be compatible with a solution over a fixed time interval. Stochastic variability of initial values between simulation runs because of uncertainty or lack of information about the initial situation is denoted initial value stochasticity. Elimination of initial value stochasticity causes bias unless the model is linear. It may also considerably enlarge bias from other sources. Unknown or unexplained variations from t
Published: 2013
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19. Arbetarkooperativ mellan två världskrig

Author: Gustafsson, Leif and Gustafsson, Leif
Published: 2013

20. Arbetarkooperativ mellan två världskrig

Author: Gustafsson, Leif and Gustafsson, Leif
Published: 2013

21. Measurement of acoustic attenuation in South Pole ice

Author: Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., Andeen, K., Auffenberg, J., Bai, X., Baker, M., Barwick, S. W., Bay, R., Alba, J. L. Bazo, Beattie, K., Beatty, J. J., Bechet, S., Becker, J. K., Becker, K. -H, Benabderrahmane, M. L., Berdermann, J., Berghaus, P., Berley, D., Bernardini, E., Bertrand, D., Besson, D. Z., Bissok, M., Blaufuss, E., Boersma, D. J., Bohm, C., Boeser, S., Botner, Olga, Bradley, L., Braun, J., Buitink, S., Carson, M., Chirkin, D., Christy, B., Clem, J., Clevermann, F., Cohen, S., Colnard, C., Cowen, D. F., D'Agostino, M. V., Danninger, M., De Clercq, C., Demiroers, L., Depaepe, O., Descamps, F., Desiati, P., de Vries-Uiterweerd, G., DeYoung, T., Diaz-Velez, J. C., Dreyer, J., Dumm, J. P., Duvoort, M. R., Ehrlich, R., Eisch, J., Ellsworth, R. W., Engdegård, Olle, Euler, S., Evenson, P. A., Fadiran, O., Fazely, A. R., Feusels, T., Filimonov, K., Finley, C., Foerster, M. M., Fox, B. D., Franckowiak, A., Franke, R., Gaisser, T. K., Gallagher, J., Ganugapati, R., Geisler, M., Gerhardt, L., Gladstone, L., Gluesenkamp, T., Goldschmidt, A., Goodman, J. A., Grant, D., Griesel, T., Gross, A., Grullon, S., Gunasingha, R. M., Gurtner, M., Gustafsson, Leif, Ha, C., Hallgren, Allan, Halzen, F., Han, K., Hanson, K., Helbing, K., Herquet, P., Hickford, S., Hill, G. C., Hoffman, K. D., Homeier, A., Hoshina, K., Hubert, D., Huelsnitz, W., Huelss, J. -P, Hulth, P. O., Hultqvist, K., Hussain, S., Imlay, R. L., Ishihara, A., Jacobsen, J., Japaridze, G. S., Johansson, H., Joseph, J. M., Kampert, K. -H, Kappes, A., Karg, T., Karle, A., Kelley, J. L., Kemming, N., Kenny, P., Kiryluk, J., Kislat, F., Klein, S. R., Knops, S., Koehne, J. -H, Kohnen, G., Kolanoski, H., Koepke, L., Koskinen, Dj., Kowalski, M., Kowarik, T., Krasberg, M., Krings, T., Kroll, G., Kuehn, K., Kuwabara, T., Labare, M., Lafebre, S., Laihem, K., Landsman, H., Lauer, R., Lehmann, R., Lennarz, D., Luenemann, J., Madsen, J., Majumdar, P., Maruyama, R., Mase, K., Matis, H. S., Matusik, M., Meagher, K., Merck, M., Meszaros, P., Meures, T., Middell, E., Milke, N., Montaruli, T., Morse, R., Movit, S. M., Nahnhauer, R., Nam, J. W., Naumann, U., Niessen, P., Nygren, D. R., Odrowski, S., Olivas, A., Olivo, Martino, Ono, M., Panknin, S., Paul, L., de los Heros, Carlos Perez, Petrovic, J., Piegsa, A., Pieloth, D., Porrata, R., Posselt, J., Price, P. B., Prikockis, M., Przybylski, G. T., Rawlins, K., Redl, P., Resconi, E., Rhode, W., Ribordy, M., Rizzo, A., Rodrigues, J. P., Roth, P., Rothmaier, F., Rott, C., Roucelle, C., Ruhe, T., Rutledge, D., Ruzybayev, B., Ryckbosch, D., Sander, H. -G, Sarkar, S., Schatto, K., Schlenstedt, S., Schmidt, T., Schneider, D., Schukraft, A., Schultes, A., Schulz, O., Schunck, M., Seckel, D., Semburg, B., Seo, S. H., Sestayo, Y., Seunarine, S., Silvestri, A., Slipakaj, A., Spiczak, G. M., Spiering, C., Stamatikos, M., Stanev, T., Stephens, G., Stezelberger, T., Stokstad, R. G., Stoyanov, S., Strahler, E. A., Straszheim, T., Sullivan, G. W., Swillens, Q., Taboada, I., Tamburro, A., Tarasova, O., Tepe, A., Ter-Antonyan, S., Tilav, S., Toale, P. A., Tosi, D., Turcan, D., van Eijndhoven, N., Vandenbroucke, J., Van Overloop, A., van Santen, J., Voigt, B., Walck, C., Waldenmaier, T., Wallraff, M., Walter, M., Wendt, C., Westerhoff, S., Whitehorn, N., Wiebe, K., Wiebusch, C. H., Wikstrom, G., Williams, D. R., Wischnewski, R., Wissing, H., Woschnagg, K., Xu, C., Xu, X. W., Yanez, J. P., Yodh, G., Yoshida, S., Zarzhitsky, P., Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., Andeen, K., Auffenberg, J., Bai, X., Baker, M., Barwick, S. W., Bay, R., Alba, J. L. Bazo, Beattie, K., Beatty, J. J., Bechet, S., Becker, J. K., Becker, K. -H, Benabderrahmane, M. L., Berdermann, J., Berghaus, P., Berley, D., Bernardini, E., Bertrand, D., Besson, D. Z., Bissok, M., Blaufuss, E., Boersma, D. J., Bohm, C., Boeser, S., Botner, Olga, Bradley, L., Braun, J., Buitink, S., Carson, M., Chirkin, D., Christy, B., Clem, J., Clevermann, F., Cohen, S., Colnard, C., Cowen, D. F., D'Agostino, M. V., Danninger, M., De Clercq, C., Demiroers, L., Depaepe, O., Descamps, F., Desiati, P., de Vries-Uiterweerd, G., DeYoung, T., Diaz-Velez, J. C., Dreyer, J., Dumm, J. P., Duvoort, M. R., Ehrlich, R., Eisch, J., Ellsworth, R. W., Engdegård, Olle, Euler, S., Evenson, P. A., Fadiran, O., Fazely, A. R., Feusels, T., Filimonov, K., Finley, C., Foerster, M. M., Fox, B. D., Franckowiak, A., Franke, R., Gaisser, T. K., Gallagher, J., Ganugapati, R., Geisler, M., Gerhardt, L., Gladstone, L., Gluesenkamp, T., Goldschmidt, A., Goodman, J. A., Grant, D., Griesel, T., Gross, A., Grullon, S., Gunasingha, R. M., Gurtner, M., Gustafsson, Leif, Ha, C., Hallgren, Allan, Halzen, F., Han, K., Hanson, K., Helbing, K., Herquet, P., Hickford, S., Hill, G. C., Hoffman, K. D., Homeier, A., Hoshina, K., Hubert, D., Huelsnitz, W., Huelss, J. -P, Hulth, P. O., Hultqvist, K., Hussain, S., Imlay, R. L., Ishihara, A., Jacobsen, J., Japaridze, G. S., Johansson, H., Joseph, J. M., Kampert, K. -H, Kappes, A., Karg, T., Karle, A., Kelley, J. L., Kemming, N., Kenny, P., Kiryluk, J., Kislat, F., Klein, S. R., Knops, S., Koehne, J. -H, Kohnen, G., Kolanoski, H., Koepke, L., Koskinen, Dj., Kowalski, M., Kowarik, T., Krasberg, M., Krings, T., Kroll, G., Kuehn, K., Kuwabara, T., Labare, M., Lafebre, S., Laihem, K., Landsman, H., Lauer, R., Lehmann, R., Lennarz, D., Luenemann, J., Madsen, J., Majumdar, P., Maruyama, R., Mase, K., Matis, H. S., Matusik, M., Meagher, K., Merck, M., Meszaros, P., Meures, T., Middell, E., Milke, N., Montaruli, T., Morse, R., Movit, S. M., Nahnhauer, R., Nam, J. W., Naumann, U., Niessen, P., Nygren, D. R., Odrowski, S., Olivas, A., Olivo, Martino, Ono, M., Panknin, S., Paul, L., de los Heros, Carlos Perez, Petrovic, J., Piegsa, A., Pieloth, D., Porrata, R., Posselt, J., Price, P. B., Prikockis, M., Przybylski, G. T., Rawlins, K., Redl, P., Resconi, E., Rhode, W., Ribordy, M., Rizzo, A., Rodrigues, J. P., Roth, P., Rothmaier, F., Rott, C., Roucelle, C., Ruhe, T., Rutledge, D., Ruzybayev, B., Ryckbosch, D., Sander, H. -G, Sarkar, S., Schatto, K., Schlenstedt, S., Schmidt, T., Schneider, D., Schukraft, A., Schultes, A., Schulz, O., Schunck, M., Seckel, D., Semburg, B., Seo, S. H., Sestayo, Y., Seunarine, S., Silvestri, A., Slipakaj, A., Spiczak, G. M., Spiering, C., Stamatikos, M., Stanev, T., Stephens, G., Stezelberger, T., Stokstad, R. G., Stoyanov, S., Strahler, E. A., Straszheim, T., Sullivan, G. W., Swillens, Q., Taboada, I., Tamburro, A., Tarasova, O., Tepe, A., Ter-Antonyan, S., Tilav, S., Toale, P. A., Tosi, D., Turcan, D., van Eijndhoven, N., Vandenbroucke, J., Van Overloop, A., van Santen, J., Voigt, B., Walck, C., Waldenmaier, T., Wallraff, M., Walter, M., Wendt, C., Westerhoff, S., Whitehorn, N., Wiebe, K., Wiebusch, C. H., Wikstrom, G., Williams, D. R., Wischnewski, R., Wissing, H., Woschnagg, K., Xu, C., Xu, X. W., Yanez, J. P., Yodh, G., Yoshida, S., and Zarzhitsky, P.
Abstract: Using the South Pole Acoustic Test Setup (SPATS) and a retrievable transmitter deployed in holes drilled for the IceCube experiment, we have measured the attenuation of acoustic signals by South Pole ice at depths between 190 m and 500 m. Three data sets, using different acoustic sources, have been analyzed and give consistent results. The method with the smallest systematic uncertainties yields an amplitude attenuation coefficient alpha = 3.20 +/- 0.57 km(-1) between 10 and 30 kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for lambda equivalent to 1/alpha of similar to 300 m with 20% uncertainty. No significant depth or frequency dependence has been found.
Published: 2011
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22. Delta Delta excitation in proton-proton induced pi(0)pi(0) production

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S. Negasi, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thorngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S. Negasi, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thorngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: Exclusive measurements of the pp -> pp pi(0)pi(0) reaction have been performed at CELSIUS/WASA at energies from threshold up to T-p = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies T-p >= GeV. where the Delta Delta excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional t-channel Delta Delta excitation. This holds also for the double-pionic fusion to the quasibound He-2. The data are compared to model predictions, which are based on both pi- and rho-exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the rho-exchange. A phenomenological modification allowing only a small rho-exchange contribution leads to a quantitative description of the data.
Published: 2011
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23. THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND He-2, IN SEARCH OF THE ABC EFFECT

Author: Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T-p = 1.4 GeV. For incident energies T-p > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound He-2 state.
Published: 2011
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24. Exclusive measurement of the pp -> nn pi(+)pi(+) reaction at 1.1 GeV

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: First exclusive data for the pp -> nnp(+)pi(+) reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of T(p) - 1.1 GeV. Total and differential cross-sections disagree with theoretical calculations, which predict the Delta Delta excitation to be the dominant process at this beam energy. Instead, the data require the excitation of one of the nucleons to a higher-lying Delta state, preferably the Delta(1600)P(33), to be the leading process.
Published: 2011
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25. Design and performance of the South Pole Acoustic Test Setup

Author: Abdou, Yasser, Becker, Karl-Heinz, Berdermann, Jens, Bissok, Martin, Bohm, Christian, Boeser, Sebastian, Bothe, Martin, Carson, Michael, Descamps, Freija, Fischer-Wolfarth, Jan-Hendrik, Gustafsson, Leif, Hallgren, Allan, Heinen, Dirk, Helbing, Klaus, Heller, Reinhart, Hundertmark, Stephan, Karg, Timo, Krieger, Kevin, Laihem, Karim, Meures, Thomas, Nahnhauer, Rolf, Naumann, Uwe, Oberson, Filip, Paul, Larissa, Pohl, Mario, Price, Buford, Ribordy, Mathieu, Ryckbosch, Dirk, Schunck, Matthias, Semburg, Benjamin, Stegmaier, Jutta, Sulanke, Karl-Heinz, Tosi, Delia, Vandenbroucke, Justin, Wiebusch, Christopher, Abdou, Yasser, Becker, Karl-Heinz, Berdermann, Jens, Bissok, Martin, Bohm, Christian, Boeser, Sebastian, Bothe, Martin, Carson, Michael, Descamps, Freija, Fischer-Wolfarth, Jan-Hendrik, Gustafsson, Leif, Hallgren, Allan, Heinen, Dirk, Helbing, Klaus, Heller, Reinhart, Hundertmark, Stephan, Karg, Timo, Krieger, Kevin, Laihem, Karim, Meures, Thomas, Nahnhauer, Rolf, Naumann, Uwe, Oberson, Filip, Paul, Larissa, Pohl, Mario, Price, Buford, Ribordy, Mathieu, Ryckbosch, Dirk, Schunck, Matthias, Semburg, Benjamin, Stegmaier, Jutta, Sulanke, Karl-Heinz, Tosi, Delia, Vandenbroucke, Justin, and Wiebusch, Christopher
Abstract: The South Pole Acoustic Test Setup (SPATS) was built to evaluate the acoustic characteristics of the South Pole ice in the 10 kHz to 100 kHz frequency range, for the purpose of assessing the feasibility of an acoustic neutrino detection array at the South Pole. The SPATS hardware consists of four vertical strings deployed in the upper 500 m of the South Pole ice cap. The strings form a trapezoidal array with a maximum baseline of 543 m. Each string has 7 stages equipped with one transmitter and one sensor module. Sound is detected or generated by piezoelectric ceramic elements inside the modules. Analogue signals are sent to the surface on electric cables where they are digitized by a PC-based data acquisition system. The data from all strings are collected on a central computer in the IceCube Laboratory from where they are send to a central data storage facility via a satellite link or stored locally on tape. A technical overview of SPATS and its performance is presented.
Published: 2011
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26. Design and performance of the South Pole Acoustic Test Setup

Author: Abdou, Yasser, Becker, Karl-Heinz, Berdermann, Jens, Bissok, Martin, Bohm, Christian, Boeser, Sebastian, Bothe, Martin, Carson, Michael, Descamps, Freija, Fischer-Wolfarth, Jan-Hendrik, Gustafsson, Leif, Hallgren, Allan, Heinen, Dirk, Helbing, Klaus, Heller, Reinhart, Hundertmark, Stephan, Karg, Timo, Krieger, Kevin, Laihem, Karim, Meures, Thomas, Nahnhauer, Rolf, Naumann, Uwe, Oberson, Filip, Paul, Larissa, Pohl, Mario, Price, Buford, Ribordy, Mathieu, Ryckbosch, Dirk, Schunck, Matthias, Semburg, Benjamin, Stegmaier, Jutta, Sulanke, Karl-Heinz, Tosi, Delia, Vandenbroucke, Justin, Wiebusch, Christopher, Abdou, Yasser, Becker, Karl-Heinz, Berdermann, Jens, Bissok, Martin, Bohm, Christian, Boeser, Sebastian, Bothe, Martin, Carson, Michael, Descamps, Freija, Fischer-Wolfarth, Jan-Hendrik, Gustafsson, Leif, Hallgren, Allan, Heinen, Dirk, Helbing, Klaus, Heller, Reinhart, Hundertmark, Stephan, Karg, Timo, Krieger, Kevin, Laihem, Karim, Meures, Thomas, Nahnhauer, Rolf, Naumann, Uwe, Oberson, Filip, Paul, Larissa, Pohl, Mario, Price, Buford, Ribordy, Mathieu, Ryckbosch, Dirk, Schunck, Matthias, Semburg, Benjamin, Stegmaier, Jutta, Sulanke, Karl-Heinz, Tosi, Delia, Vandenbroucke, Justin, and Wiebusch, Christopher
Abstract: The South Pole Acoustic Test Setup (SPATS) was built to evaluate the acoustic characteristics of the South Pole ice in the 10 kHz to 100 kHz frequency range, for the purpose of assessing the feasibility of an acoustic neutrino detection array at the South Pole. The SPATS hardware consists of four vertical strings deployed in the upper 500 m of the South Pole ice cap. The strings form a trapezoidal array with a maximum baseline of 543 m. Each string has 7 stages equipped with one transmitter and one sensor module. Sound is detected or generated by piezoelectric ceramic elements inside the modules. Analogue signals are sent to the surface on electric cables where they are digitized by a PC-based data acquisition system. The data from all strings are collected on a central computer in the IceCube Laboratory from where they are send to a central data storage facility via a satellite link or stored locally on tape. A technical overview of SPATS and its performance is presented.
Published: 2011
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27. Consistent micro, macro and state-based population modelling

Author: Gustafsson, Leif, Sternad, Mikael, Gustafsson, Leif, and Sternad, Mikael
Abstract: A population system can be modelled using a micro model focusing on the individual entities, a macro model where the entities are aggregated into compartments, or a state-based model where each possible discrete state in which the system can exist is represented. However, the concepts, building blocks, procedural mechanisms and the time handling for these approaches are very different. For the results and conclusions from studies based on micro, macro and state-based models to be consistent (contradiction-free), a number of modelling issues must be understood and appropriate modelling procedures be applied. This paper presents a uniform approach to micro, macro and state-based population modelling so that these different types of models produce consistent results and conclusions. In particular, we demonstrate the procedures (distribution, attribute and combinatorial expansions) necessary to keep these three types of models consistent. We also show that the different time handling methods usually used in micro, macro and state-based models can be regarded as different integration methods that can be applied to any of these modelling categories. The result is free choice in selecting the modelling approach and the time handling method most appropriate for the study without distorting the results and conclusions.
Published: 2010
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28. The pd →3Heηπ0 reaction at Tp = 1450 MeV

Author: 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.
Published: 2010
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29. Production of eta and 3 pi mesons in the pd -> (HeX)-He-3 reaction at 1360 and 1450 MeV

Author: 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.
Published: 2010
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30. Two-pion production in proton-proton collisions : experimental total cross sections and their isospin decomposition

Author: Skorodko, T, Bashkanov, M, Bogoslawsky, D, Calèn, Hans, Clement, H, Doroshkevich, E, Demiroers, L, Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G, Jacewicz, Marek, Jiganov, E, Johansson, Tord, Khakimova, O, Keleta, Samson, Koch, Inken, Kren, F, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R, Morosov, B, Pauly, C, Petrén, Henrik, Petukhov, Y, Povtorejko, A, Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W, Shwartz, B, Stepaniak, J, Thörngren-Engblom, Pia, Tikhomirov, V, Wagner, G.J., Wolke, Magnus, Yamamoto, A, Zabierowski, J, Zlomanczuk, Jozef, Skorodko, T, Bashkanov, M, Bogoslawsky, D, Calèn, Hans, Clement, H, Doroshkevich, E, Demiroers, L, Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G, Jacewicz, Marek, Jiganov, E, Johansson, Tord, Khakimova, O, Keleta, Samson, Koch, Inken, Kren, F, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R, Morosov, B, Pauly, C, Petrén, Henrik, Petukhov, Y, Povtorejko, A, Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W, Shwartz, B, Stepaniak, J, Thörngren-Engblom, Pia, Tikhomirov, V, Wagner, G.J., Wolke, Magnus, Yamamoto, A, Zabierowski, J, and Zlomanczuk, Jozef
Abstract: The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to T-P = 1.36 GeV. Total and differential Cross sections have been obtained for the channels pn pi(+)pi(0), pp pi(+)pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-P > 1GeV, i.e. in the region which is beyond the Roper excitation but at the onset of Delta Delta excitation, the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as all order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. An isospin decomposition of the total cross sections exhibits a s-channel-like energy dependence in the region of the Roper excitation as well as a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As possible candidates the Delta(1600) and the Delta(1700) are discussed. (C) 2009 Elsevier B.V. All rights reserved.
Published: 2009
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31. Double-Pionic Fusion of Nuclear Systems and the 'ABC' Effect : Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

Author: Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The ABC effect-a puzzling low-mass enhancement in the pi pi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn -> d pi(0)pi(0) at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pi pi)(I=L=0) channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a Delta Delta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.
Published: 2009
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32. eta PRODUCTION IN PROTON-PROTON COLLISIONS AT 72 MeV EXCESS ENERGY

Author: Pettersson, Henrik, Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekstrom, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Pettersson, Henrik, Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekstrom, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The production of eta mesons at an excess energy of 72 MeV has been studied in the reaction pp -> pp(eta)gamma gamma. It is shown that a simple model with Pp. final states included reproduces observed differential distributions better than the same model restricted to Ss, Sd and Ds final states. The strong influence of the Pp states could be taken as an indication of rho dominance within an one boson exchange model for the excitation of N*(1535).
Published: 2009
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33. THE pp -> d pi(+)pi(0) REACTION - A CASE OF Delta Delta EXCITATION WITHOUT ABC-EFFECT

Author: Kren, F., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., 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., Zlomanczuk, Jozef, Kren, F., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., 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., and Zlomanczuk, Jozef
Abstract: The ABC effect, a low-mass enhancement in the invariant pp mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the sigma channel of the pp system. With exclusive measurements of the pp -> d pi(+)pi(0) reaction at T-p = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector Delta Delta channel (rho channel) despite the fact that the Delta Delta excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel Delta Delta excitation with the subsequent decay into the vector-isovector Delta Delta channel given by the rho channel operator.
Published: 2009
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34. ISOSPIN DECOMPOSITION OF pp -> NN pi pi CROSS SECTIONS : DO WE SEE A SIGN OF Delta(1600) EXCITATION IN THE nn pi(+)pi(+) CHANNEL?

Author: Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to T-p = 1.36 GeV. Total and differential cross sections have been obtained for the channels pn pi(+) pi(0), pp pi(+) pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-p > 1 GeV, i.e. in the region, which is beyond the Roper excitation but at the onset of Delta Delta excitation the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As a possible candidate the Delta(1600) is discussed.
Published: 2009
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35. Rörelser i rörelsen : tidiga föreningar för absolut nykterhet i Karlshamnstrakten

Author: Gustafsson, Leif and Gustafsson, Leif
Published: 2009

36. Rörelser i rörelsen : tidiga föreningar för absolut nykterhet i Karlshamnstrakten

Author: Gustafsson, Leif and Gustafsson, Leif
Published: 2009

37. Polarisation of the omega meson in the pd -> He-3 omega reaction at 1360 and 1450 MeV

Author: 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
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38. The WASA detector facility at CELSIUS

Author: Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, Hans, Capellaro, Filippo, Chilingarov, A., Clement, H., Comfort, J., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fridén, Carl-Johan, Geren, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, A., Johansson, Tord, Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, Pawel, Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B. M. K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Patzold, J., Petukhov, Y., Povtorejko, A., Reistad, Dag, Ruber, Roger J. M. Y., Sandukovsky, S., Schönning, Karin, Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegner, P-E, Engblom, P. Thorngren, Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G. J., Wiedner, Ulrich, Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., Zlomanczuk, Josef, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, Hans, Capellaro, Filippo, Chilingarov, A., Clement, H., Comfort, J., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fridén, Carl-Johan, Geren, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, A., Johansson, Tord, Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, Pawel, Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B. M. K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Patzold, J., Petukhov, Y., Povtorejko, A., Reistad, Dag, Ruber, Roger J. M. Y., Sandukovsky, S., Schönning, Karin, Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegner, P-E, Engblom, P. Thorngren, Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G. J., Wiedner, Ulrich, Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., and Zlomanczuk, Josef
Abstract: The WASA 4 pi 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 unique feature of the system is the use of hydrogen pellets as internal targets for the first time. A detailed description of the design, together with the anticipated and achieved performance parameters are given. (C) 2008 Elsevier B.V. All rights reserved.
Published: 2008
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39. Measurement of eta meson decays into lepton-antilepton pairs

Author: 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
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40. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Franssen, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M., Keleta, S., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Franssen, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M., Keleta, S., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: In most investigations the Roper resonance is sensed only very indirectly via complex partial-wave analyses. We find indications for its excitation in the invariant n pi(+) mass spectrum of the pp -> np pi(+) reaction at M approximate to 1360 MeV with a width of approximate to 150 MeV . The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In the near-threshold two-pion production pp -> pp pi(0)pi(0) , where the Roper excitation and its subsequent decays via the routes N* -> Delta pi -> N pi pi and N* -> N sigma are the only dominant processes, we find its direct decay into the N sigma channel to be the by far dominating decay process -in favor of a monopole excitation of the Roper resonance.
Published: 2008
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41. Measurement of the eta -> pi(+)pi(-)e(+)e(-) decay branching ratio

Author: 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
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42. Bringing consistency to simulation of population models - Poisson simulation as a bridge between micro and macro simulation

Author: Gustafsson, Leif, Sternad, Mikael, Gustafsson, Leif, and Sternad, Mikael
Abstract: Population models concern collections of discrete entities such as atoms, cells, humans, animals, etc., where the focus is on the number of entities in a population. Because of the complexity of such models, simulation is usually needed to reproduce their complete dynamic and stochastic behaviour. Two main types of simulation models are used for different purposes, namely micro-simulation models, where each individual is described with its particular attributes and behaviour, and macro-simulation models based on stochastic differential equations, where the population is described in aggregated terms by the number of individuals in different states. Consistency between micro- and macro-models is a crucial but often neglected aspect. This paper demonstrates how the Poisson Simulation technique can be used to produce a population macro-model consistent with the corresponding micro-model. This is accomplished by defining Poisson Simulation in strictly mathematical terms as a series of Poisson processes that generate sequences of Poisson distributions with dynamically varying parameters. The method can be applied to any population model. It provides the unique stochastic and dynamic macro-model consistent with a correct micro-model. The paper also presents a general macro form for stochastic and dynamic population models. In an appendix Poisson Simulation is compared with Markov Simulation showing a number of advantages. Especially aggregation into state variables and aggregation of many events per time-step makes Poisson Simulation orders of magnitude faster than Markov Simulation. Furthermore, you can build and execute much larger and more complicated models with Poisson Simulation than is possible with the Markov approach.
Published: 2007
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43. pi pi production in proton-proton collisions

Author: Skorodko, T., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Greiff, Jan, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, Zlomanczuk, Jozef, Skorodko, T., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Greiff, Jan, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, and Zlomanczuk, Jozef
Abstract: At CELSIUS-WASA the two-pion production in proton-proton collisisons has been measured exclusively from threshold up to the energy regime, where both of the collision partners are expected to be excited to the Δ state. The measurements constitute the first kinematically complete data samples of solid statistics in this energy range. Most of the data have been obtained for the π+π- and π0π0channels. Whereas at near-threshold energies the differential distributions can be succesfully explained by chiral dynamics and Roper excitation, respectively, the data for the π+π- channel in the ΔΔ region can be described only, if the special configuration (ΔΔ)0+ is assumed. The data for the π0π0 channel moreover exhibit a low-mass enhancement in the π0π0 invariant mass spectrum, which is reminiscent of the ABC-effect found in double-pionic fusion to light nuclei.
Published: 2007
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44. The pp→ppπππ reaction channels in the threshold region

Author: Pauly, C., Jacewicz, Marek, Koch, Inken, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jiganov, E., Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J.M.Y, Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Pauly, C., Jacewicz, Marek, Koch, Inken, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jiganov, E., Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J.M.Y, Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The cross section for direct neutral and charged three pion production in pp interactions was measured at excess energies in the range 160–216 MeV. That comprises the first measurement of the pp→ppπ0π0π0 reaction and the direct comparison with the pp→ppπ+π−π0 process. The experiment was performed above the η meson production threshold and the cross section could be directly normalized to the cross section of the pp→ppη reaction, with the η decaying into 3 pions. Since the same final states are selected, the measurement has a low systematical error. The measured cross section ratio σ(pp→ppπ+π−π0)/σ(pp→ppπ0π0π0) is compared to predictions of dominance of different isobars in the intermediate state.
Published: 2007
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45. Measurement of the slope parameter for the η → 3π0 decay in the pp → ppη reaction

Author: Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Demirörs, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Demirörs, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The CELSIUS-WASA setup is used to measure the 3π0 decay of η mesons produced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV. The efficiency-corrected Dalitz plot and density distributions for this decay are shown, together with a fit of the quadratic slope parameter α yielding α = −0.026 ± 0.010(stat) ± 0.010(syst). This value is compared to recent experimental results and theoretical predictions.
Published: 2007
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46. Low-mass pi pi enhancement in baryonic pi pi production : ABC effect revised by exclusive measurements

Author: Bashkanov, M., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupść, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, Zlomanczuk, Jozef, Bashkanov, M., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupść, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, and Zlomanczuk, Jozef
Abstract: The ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge ππ threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a σ-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of πππ rather than of ππ nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two Δ particles created in this process is of crucial importance.
Published: 2007
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47. Observation of the abc effect in the first exclusive measurements of pn -> d pi(0)pi(0)

Author: Khakimova, O., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, Zlomanczuk, Jozef, Khakimova, O., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, and Zlomanczuk, Jozef
Abstract: The reaction pn → dπ0π0 constitutes the most fundamental system for the study of the ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of the ππ system in double-pionic fusion to nuclear bound states. The first exclusive measurements of this reaction have now been carried out at CELSIUS-WASA. They exhibit a striking low-mass enhancement in the ππ invariant mass spectrum, prove it to be a σ-channel phenomenon and falsify conventional theoretical models, which predict an associated high-mass enhancement not present in the new exclusive data. In the kinematically complete data sample we observe a ΔΔ excitation, where the interaction between the two Δ obviously plays a crucial role for the generation of the ππ low-mass enhancement.
Published: 2007
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48. The p p -> p p pi pi pi reaction channels in the threshold region

Author: Pauly, C., Jacewicz, Marek, Koch, Inken, Calen, Hans, Capellaro, Filippo, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Pettersson, Henrik, Schönning, Karin, Thörngren, Pia, Zlomanczuk, Jozef, Pauly, C., Jacewicz, Marek, Koch, Inken, Calen, Hans, Capellaro, Filippo, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Pettersson, Henrik, Schönning, Karin, Thörngren, Pia, and Zlomanczuk, Jozef
Published: 2007

49. Measurement of η meson decays into lepton-antilepton pairs

Author: Calén, Hans, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Petterson, Henrik, Schönning, Karin, Thörngren Engblom, Pia, Zlomanczuk, Jozef, Calén, Hans, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Petterson, Henrik, Schönning, Karin, Thörngren Engblom, Pia, and Zlomanczuk, Jozef
Abstract: A search for rare lepton decays of the η meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay η→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 9.7×10−5 η(90% CL). The branching ratio for the decay η→e+e−γ is determined to (7.8±0.5stat ±0.8syst)×10−3 in agreement with world average value. An upper limit (90% CL) for the branching ratio for the η→e+e− decay is 2.7 × 10−5 and a limit for the sum of the η→μ+μ−μ+μ− and η→π+π−μ+μ− decays is 3.6 × 10−4.
Published: 2007

50. On the pipi production in free and in-medium NN-collisions: sigma-channel low-mass enhancement and pi0pi0/pi+pi- asymmetry

Author: Calen, Hans, Fransson, Kjell, Gustafsson, Leif, Hoistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren, Pia, Zlomanczuk, Jozef, Calen, Hans, Fransson, Kjell, Gustafsson, Leif, Hoistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren, Pia, and Zlomanczuk, Jozef
Published: 2006

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