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1. Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements

Author

Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupsc, A., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, R. J. M. Y., Schonning, K., Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thorngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, J.

Subjects
Nuclear Experiment
Abstract

The ABC effect - a puzzling low-mass enhancement in the $\pi\pi$ invariant mass spectrum - is well-known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on first exclusive and kinematically complete measurements of the most basic double pionic fusion reaction $pn \to d \pi^0\pi^0$ at 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 resonance-like 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
2008
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2. Two-Pion Production in Nucleon-Nucleon Collisions and the ABC-Effect - Approaching a Puzzleby exclusive and Kinematically complete Measurements

Author

Skorodko, T., Bashkanov, M., Bargholtz, C., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekstrom, C., Fransson, K., Geren, L., Hoistad, L. Gustafsson. B., Ivanov, G., Jacewicz, l M., Jiganov, E., Johansson, T., Kaskulov, M., Khakimova, O., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupsc, A., Kuznetsov, A., Lindberg, K., Marciniewski, P., Martemyanov, B., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, R. J. M. Y., Schonning, K., Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Tegner, P. -E., Thorngren-Engholm, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, J.

Subjects
Nuclear Experiment
Abstract

The ABC effect - a puzzling low-mass enhancement in the $\pi\pi$ invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear collisions, where it always showed up, if the participating nucleons fused to a bound nuclear system in the final state. The first exclusive measurements on the ABC effect have been carried out very recently at CELSIUS-WASA for the fusion reactions leading to d, $^3$He and $^4$He nuclei in the final state. The data analyzed so far for the fusion processes to d and $^3$He reveal this effect to be a $\sigma$ channel phenomenon associated with the formation of a strongly attractive $\Delta\Delta$ system. The data for the strictly isospin-selective double-pionic fusion to $^4$He, where we expect the largest effect, are currently still analyzed. All inclusive data on this system are well described by our model, too. This case also constitutes the heaviest nuclear system, where exclusive measurements of double-pionic fusion can be carried out with present-day instruments. Surprisingly, the $pp \to pp\pi^0\pi^0$ reaction in the $\Delta\Delta$ region is observed to also show a ABC-like low-$\pi\pi$ mass enhancement, a phenomenon, which deserves special attention.

Published
2006

3. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

Author

The CELSIUS-WASA Collaboration, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Franssen, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Schönning, K., Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Złomanczuk, J., Hammer, Hans-Werner, editor, Kleber, Vera, editor, Thoma, Ulrike, editor, and Schmieden, Hartmut, editor

Published
2008
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5. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Franssen, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Schönning, K., Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Złomanczuk, J., and The CELSIUS-WASA Collaboration

Published
2008
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6. Measurement of the eta -> 3 pi(0) Dalitz plot distribution with the WASA detector at COSY

Author

ADOLPH, C, ANGELSTEIN, M, BASHKANOV, M, BECHSTEDT, U, BELOSTOTSKI, S, BERLOWSKI, M, BHATT, H, BISPLINGHOFF, J, BONDAR, A, BORASOY, B, BUSCHER, M, SCOBEL, W, SEFZICK, T, SERDYUK, V, SHAH, N, SIEMASZKO, M, SIUDAK, R, SKORODKO, T, SMOLINSKI, T, SMYRSKI, J, SOPOV, V, CALEN, H, SPOLGEN, D, STEPANIAK, J, STERZENBACH, G, STROHER, H, SZCZUREK, A, TEUFEL, A, TOLBA, T, TRZCINSKI, A, ULBRICH, K, VARMA, R, CHANDWANI, K, VLASOV, P, WEGLORZ, W, WINNEMOLLER, A, WIRZBA, A, WOLKE, M, WRONSKA, A, WUSTNER, R, XU, H, YAMAMOTO, A, YAMAOKA, H, CLEMENT, H, YUAN, X, YUREV, L, ZABIEROWSKI, J, ZHENG, C, ZIELINSKI, MJ, ZIPPER, W, ZLOMANCZUK, J, ZWOLL, K, ZYCHOR, I, CZERWINSKI, E, CZYZYKIEWICZ, R, D'ORSANEO, G, DUNIEC, D, EKSTROM, C, ENGELS, R, ERVEN, W, EYRICH, W, FEDORETS, P, FELDEN, O, FRANSSON, K, GIL, D, GOLDENBAUM, F, GRIGORYEV, K, HECZKO, A, HANHART, C, HEJNY, V, HINTERBERGER, F, HODANA, M, HOISTAD, B, IZOTOV, A, JACEWICZ, M, JANUSZ, M, JANY, BR, JARCZYK, L, JOHANSSON, T, KAMYS, B, KEMMERLING, G, KESHELASHVILI, I, KHAKIMOVA, O, KHOUKAZ, A, KILIAN, K, KIMURA, N, KISTRYN, S, KLAJA, J, KLAJA, P, KLEINES, H, KLOS, B, KOWALCZYK, A, KREN, F, KRZEMIEN, W, KULESSA, P, KULLANDER, S, KUPSC, A, KUZMIN, A, KYRYANCHUK, V, MAJEWSKI, J, MACHNER, H, MAGIERA, A, MAIER, R, MARCINIEWSKI, R, MIGDAL, W, MEISSNER, UG, MIKIRTYCHIANTS, M, MIKLUKHO, O, MILKE, N, MITTAG, M, MOSKAL, P, NANDI, BK, NAWROT, A, NISSLER, R, ODOYO, MA, OELERT, W, OHM, H, PAUL, N, PAULY, C, PETUKHOV, Y, PISKUNOV, N, PLUCINSKI, P, PODKOPAL, P, POVTOREYKO, A, PRASUHN, D, PRICKING, A, PYSZ, K, RACHOWSKI, J, RAUSMANN, T, REDMER, CF, RITMAN, J, ROY, A, RUBER, RJMY, RUDY, Z, SALMIN, R, SCHADMAND, S, SCHMIDT, A, SCHNEIDER, H, and SCHROEDER, W

Subjects
Current-Algebra, Performance, Dalitz plot, Nuclear Theory, hadronic decay [eta], 1.4 GeV, interaction [p p], final-state interaction [pi pi], Juelich COSY PS, +2p+eta%22">p p --> 2p eta, eta, Final-State Interactions, +3+pi%280%29%22">eta -> 3 pi(0), Chiral Perturbation-Theory, +3+Pi%280%29%22">Eta -> 3 Pi(0), Channels, 3-Pi%22">Eta->3-Pi, ddc:530, Nuclear Experiment, Daq System, hadroproduction [eta], Eta, Pi-Pi Scattering, Electromagnetic Corrections, slope [Dalitz plot], Dalitz Plot, High Energy Physics::Experiment, Decays, +3pi0%22">eta --> 3pi0
Abstract

In the first production run of the WASA experiment at COSY, the eta decay into three neutral pions was measured in proton-proton interactions at a proton beam kinetic energy of 1.4 GeV. The Dalitz plot of the three pions was studied using 1.2e5 fully reconstructed events, and the quadratic slope parameter alpha was determined to be -0.027+/-0.008(stat)+/-0.005(syst). The result is consistent with previous measurements and further corroborates the importance of pion-pion final state interactions., Comment: 6 pages, 4 figures, elsarticle

Published
2009

7. Measurement of the $\eta \rightarrow 3\pi ^{0}$ Dalitz plot distribution with the WASA detector at COSY

Author

Adolph, C., Angelstein, M., Bashkanov, M., Bechstedt, U., Belostotski, S., Berłowski, M., Bhatt, H., Bisplinghoff, J., Bondar, A., Borasoy, B., Büscher, M., Calén, H., Chandwani, K., Clement, H., Czerwiński, Eryk, Czyżykiewicz, Rafał, D'Orsaneo, G., Duniec, D., Ekström, C., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Felden, O., Fransson, K., Gil, Damian, Goldenbaum, F., Grigoryev, K., Heczko, Andrzej, Hanhart, C., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Izotov, A., Jacewicz, M., Janusz, Michał, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Keshelashvili, I., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Kistryn, Stanisław, Klaja, Joanna, Klaja, Paweł, Kleines, H., Klos, B., Kowalczyk, A., Kren, F., Krzemień, Wojciech, Kulessa, P., Kullander, S., Kupść, A., Kuzmin, A., Kyryanchuk, V., Majewski, J., Machner, H., Magiera, Andrzej, Maier, R., Marciniewski, P., Migdał, Wojciech, Meißner, U.-G., Mikirtychiants, M., Miklukho, O., Milke, N., Mittag, M., Moskal, Paweł, Nandi, B. K., Nawrot, A., Nißler, R., Odoyo, M. A., Oelert, W., Ohm, H., Paul, N., Pauly, C., Petukhov, Y., Piskunov, N., Pluciński, P., Podkopał, Paweł, Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rachowski, J., Rausmann, T., Redmer, C. F., Ritman, J., Roy, A., Ruber, R. J. M. Y., Rudy, Zbigniew, Salmin, R., Schadmand, S., Schmidt, A., Schneider, H., Schroeder, W., Scobel, W., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Smoliński, Tytus, Smyrski, Jerzy, Sopov, V., Spölgen, D., Stepaniak, J., Sterzenbach, G., Ströher, H., Szczurek, A., Teufel, A., Tolba, T., Trzciński, A., Ulbrich, K., Varma, R., Vlasov, P., Weglorz, W., Winnemöller, A., Wirzba, A., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Xu, H., Yamamoto, A., Yamaoka, H., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zieliński, Marcin, Zipper, W., Złomańczuk, J., Zwoll, K., and Zychor, I.

Published
2009

8. Measurement of the [formula omitted] Dalitz plot distribution with the WASA detector at COSY

Author

Adolph, C., Angelstein, M., Bashkanov, M., Bechstedt, U., Belostotski, S., Berłowski, M., Bhatt, H., Bisplinghoff, J., Bondar, A., Borasoy, B., Büscher, M., Calén, H., Chandwani, K., Clement, H., Czerwiński, E., Czyżykiewicz, R., D'Orsaneo, G., Duniec, D., Ekström, C., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Felden, O., Fransson, K., Gil, D., Goldenbaum, F., Grigoryev, K., Heczko, A., Hanhart, C., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Izotov, A., Jacewicz, M., Janusz, M., Jany, B.R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Keshelashvili, I., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Kistryn, S., Klaja, J., Klaja, P., Kleines, H., Klos, B., Kowalczyk, A., Kren, F., Krzemień, W., Kulessa, P., Kullander, S., Kupść, A., Kuzmin, A., Kyryanchuk, V., Majewski, J., Machner, H., Magiera, A., Maier, R., Marciniewski, P., Migdał, W., Meißner, U.-G., Mikirtychiants, M., Miklukho, O., Milke, N., Mittag, M., Moskal, P., Nandi, B.K., Nawrot, A., Nißler, R., Odoyo, M.A., Oelert, W., Ohm, H., Paul, N., Pauly, C., Petukhov, Y., Piskunov, N., Pluciński, P., Podkopał, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rachowski, J., Rausmann, T., Redmer, C.F., Ritman, J., Roy, A., Ruber, R.J.M.Y., Rudy, Z., Salmin, R., Schadmand, S., Schmidt, A., Schneider, H., Schroeder, W., Scobel, W., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Smoliński, T., Smyrski, J., Sopov, V., Spölgen, D., Stepaniak, J., Sterzenbach, G., Ströher, H., Szczurek, A., Teufel, A., Tolba, T., Trzciński, A., Ulbrich, K., Varma, R., Vlasov, P., Weglorz, W., Winnemöller, A., Wirzba, A., Wolke, M., Wrońska, A., Wüstner, P., Xu, H., Yamamoto, A., Yamaoka, H., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zieliński, M.J., Zipper, W., Złomańczuk, J., Zwoll, K., and Zychor, I.

Published
2009
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9. Entrance channel dependence of quasifission in reactions forming 220 Th

Author

Thomas, Renju, Duniec, D, Zenke, Friedemann, Dasgupta, Mahananda, Brown, Michael, Evers, Maurits, Gasques , Leandro, Rodriguez, Matias, Diaz-Torres, Alexis, Hinde, David, Thomas, Renju, Duniec, D, Zenke, Friedemann, Dasgupta, Mahananda, Brown, Michael, Evers, Maurits, Gasques , Leandro, Rodriguez, Matias, Diaz-Torres, Alexis, and Hinde, David

Abstract

Mass-angle correlations of binary fragments produced in O16+Pb204, S34+W186, and Ti48,50+Er166,170 reactions have been measured for a range of bombarding energies around their Coulomb barriers. At above-barrier energies, the width of the mass distributions for the fission-like fragments in the Ti50+Er170 reaction are found to be higher than those from the same compound system at similar excitation energies populated via the more mass asymmetric entrance channel reaction S34+W186, which in turn is higher than those for the O16+Pb204 system. The width of the mass distributions of the Ti+Er systems is found to increase with decreasing bombarding energies, in contrast with those of the O16+Pb204 and S34+W186 systems, which show a monotonic reduction in mass widths. This may be associated with the elongated contact configuration at sub-barrier energies.

Published
2008

10. Fission Mass Widths in 19 F + 232 Th, 16 O + 235,238 U Reactions at Near-barrier Energies

Author

Yanez, Ariel, Bouriquet, Bertrand, Duniec, D, Hinde, David, Yanez, Ariel, Bouriquet, Bertrand, Duniec, D, and Hinde, David

Abstract

The fission fragment mass ratio distributions of fusion-fission events have been measured for the reactions of 19F + 232Th, 16O + 235U, and 16O + 238U at energies near and below the fusion barrier. It is found that the mass ratio widths follow a decreasing trend with decreasing energy, contrary to recent claims of anomalous mass widths attributed to a quasifission mechanism.

Published
2005

11. Measurement of the η→3π0 Dalitz plot distribution with the WASA detector at COSY

Author

Adolph, C., primary, Angelstein, M., additional, Bashkanov, M., additional, Bechstedt, U., additional, Belostotski, S., additional, Berłowski, M., additional, Bhatt, H., additional, Bisplinghoff, J., additional, Bondar, A., additional, Borasoy, B., additional, Büscher, M., additional, Calén, H., additional, Chandwani, K., additional, Clement, H., additional, Czerwiński, E., additional, Czyżykiewicz, R., additional, D'Orsaneo, G., additional, Duniec, D., additional, Ekström, C., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Felden, O., additional, Fransson, K., additional, Gil, D., additional, Goldenbaum, F., additional, Grigoryev, K., additional, Heczko, A., additional, Hanhart, C., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Izotov, A., additional, Jacewicz, M., additional, Janusz, M., additional, Jany, B.R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Keshelashvili, I., additional, Khakimova, O., additional, Khoukaz, A., additional, Kilian, K., additional, Kimura, N., additional, Kistryn, S., additional, Klaja, J., additional, Klaja, P., additional, Kleines, H., additional, Klos, B., additional, Kowalczyk, A., additional, Kren, F., additional, Krzemień, W., additional, Kulessa, P., additional, Kullander, S., additional, Kupść, A., additional, Kuzmin, A., additional, Kyryanchuk, V., additional, Majewski, J., additional, Machner, H., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Migdał, W., additional, Meißner, U.-G., additional, Mikirtychiants, M., additional, Miklukho, O., additional, Milke, N., additional, Mittag, M., additional, Moskal, P., additional, Nandi, B.K., additional, Nawrot, A., additional, Nißler, R., additional, Odoyo, M.A., additional, Oelert, W., additional, Ohm, H., additional, Paul, N., additional, Pauly, C., additional, Petukhov, Y., additional, Piskunov, N., additional, Pluciński, P., additional, Podkopał, P., additional, Povtoreyko, A., additional, Prasuhn, D., additional, Pricking, A., additional, Pysz, K., additional, Rachowski, J., additional, Rausmann, T., additional, Redmer, C.F., additional, Ritman, J., additional, Roy, A., additional, Ruber, R.J.M.Y., additional, Rudy, Z., additional, Salmin, R., additional, Schadmand, S., additional, Schmidt, A., additional, Schneider, H., additional, Schroeder, W., additional, Scobel, W., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Smoliński, T., additional, Smyrski, J., additional, Sopov, V., additional, Spölgen, D., additional, Stepaniak, J., additional, Sterzenbach, G., additional, Ströher, H., additional, Szczurek, A., additional, Teufel, A., additional, Tolba, T., additional, Trzciński, A., additional, Ulbrich, K., additional, Varma, R., additional, Vlasov, P., additional, Weglorz, W., additional, Winnemöller, A., additional, Wirzba, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Xu, H., additional, Yamamoto, A., additional, Yamaoka, H., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M.J., additional, Zipper, W., additional, Złomańczuk, J., additional, Zwoll, K., additional, and Zychor, I., additional

Published
2009
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12. Double-Pionic Fusion of Nuclear Systems and the “ABC” Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

Author

Bashkanov, M., primary, Bargholtz, C., additional, Berłowski, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demiroers, L., additional, Doroshkevich, E., additional, Duniec, D., additional, Ekström, C., additional, Fransson, K., additional, Geren, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Khakimova, O., additional, Keleta, S., additional, Koch, I., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Meier, R., additional, Morosov, B., additional, Pauly, C., additional, Pettersson, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Pricking, A., additional, Ruber, R. J. M. Y., additional, Schönning, K., additional, Scobel, W., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepaniak, J., additional, Tegner, P.-E., additional, Thörngren-Engblom, P., additional, Tikhomirov, V., additional, Turowiecki, A., additional, Wagner, G. J., additional, Wolke, M., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomanczuk, J., additional

Published
2009
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13. Single- and double-pion production in nucleon collisions on the nucleon and on nuclei—the ABC effect and its origin in a dibaryonic resonance

Author

Clement, H., primary, Bashkanov, M., additional, Bargholtz, C., additional, Bogoslawsky, D., additional, Calen, H., additional, Cappellaro, F., additional, Demiroers, L., additional, Doroshkevich, E., additional, Duniec, D., additional, Ekström, C., additional, Franssen, K., additional, Geren, L., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Kaskulov, M., additional, Khakimova, O., additional, Keleta, S., additional, Koch, I., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Kuznetsov, A., additional, Lindberg, K., additional, Marciniewski, P., additional, Meier, R., additional, Morosov, B., additional, Pauly, C., additional, Petterson, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Pricking, A., additional, Schönning, K., additional, Scobel, W., additional, Shwartz, B., additional, Skorodko, T., additional, Sopov, V., additional, Stepeniak, J., additional, Tegner, P.-E., additional, Thörngren-Engblom, P., additional, Tikhomirov, V., additional, Wagner, G.J., additional, Wolke, M., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zartova, I., additional, and Złomanczuk, J., additional

Published
2008
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16. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆.

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Franssen, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M., and Keleta, S.

Subjects
RESONANCE, PARTICLES (Nuclear physics), SCATTERING (Physics), MASS spectrometry, PHASE shift (Nuclear physics)
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 nπ+ mass spectrum of the pp → npπ+ reaction at M ≈ 1360 MeV with a width of ≈ 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 → ppπ0π0 , where the Roper excitation and its subsequent decays via the routes N * → Δπ → Nππ and N * → Nσ are the only dominant processes, we find its direct decay into the Nσ channel to be the by far dominating decay process --in favor of a monopole excitation of the Roper resonance. [ABSTRACT FROM AUTHOR]

Published
2008
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18. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆.

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Franssen, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M., and Keleta, S.

Subjects
*RESONANCE, *PARTICLES (Nuclear physics), *SCATTERING (Physics), *MASS spectrometry, *PHASE shift (Nuclear physics)
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 nπ+ mass spectrum of the pp → npπ+ reaction at M ≈ 1360 MeV with a width of ≈ 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 → ppπ0π0 , where the Roper excitation and its subsequent decays via the routes N * → Δπ → Nππ and N * → Nσ are the only dominant processes, we find its direct decay into the Nσ channel to be the by far dominating decay process --in favor of a monopole excitation of the Roper resonance. [ABSTRACT FROM AUTHOR]

Published
2008
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