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2. Perspectives of Core-Collapse Supernovae beyond SN 1987A

Author

Janka, H. -Th. and Keil, W.

Subjects
Astrophysics
Abstract

The observation of neutrinos from Supernova 1987A has confirmed the theoretical conjecture that these particles play a crucial role during the collapse of the core of a massive star. Only one per cent of the energy they carry away from the newly formed neutron star may account for all the kinetic and electromagnetic energy responsible for the spectacular display of the supernova explosion. However, the neutrinos emitted from the collapsed stellar core at the center of the explosion couple so weakly to the surrounding matter that convective processes behind the supernova shock and/or inside the nascent neutron star might be required to increase the efficiency of the energy transfer to the stellar mantle and envelope. The conditions for a successful explosion by the neutrino-heating mechanism and the possible importance of convection in and around the neutron star are shortly discussed. Neutrino-driven explosions turn out to be very sensitive to the parameters describing the neutrino emission of the proto-neutron star and to the details of the dynamical processes in the collapsed stellar core. Therefore uniform explosions with a well defined energy seem unlikely and type-II supernova explosions do not offer promising perspectives for being useful as standard candles., Comment: 18 pages, Latex, 17 postscript figures, uses GAT65.sty, to be published in Supernovae and Cosmology, Proc. of the Colloquium in Honor of Prof. G. Tammann, Augst, Switzerland, June 13, 1997

Published
1997

3. Nucleon Spin Fluctuations and the Supernova Emission of Neutrinos and Axions

Author

Janka, H. -T., Keil, W., Raffelt, G., and Seckel, D.

Subjects
Astrophysics, High Energy Physics - Phenomenology, Nuclear Theory
Abstract

In the hot and dense medium of a supernova (SN) core, the nucleon spins fluctuate so fast that the axial-vector neutrino opacity and the axion emissivity are expected to be significantly modified. Axions with $m_a\alt10^{-2}\,{\rm eV}$ are not excluded by SN~1987A. A substantial transfer of energy in neutrino-nucleon ($\nu N$) collisions is enabled which may alter the spectra of SN neutrinos relative to calculations where energy-conserving $\nu N$ collisions had been assumed near the neutrinosphere., Comment: 8 pages. REVTeX. 2 postscript figures, can be included with epsf. Small modifications of the text, a new "Note Added", and three new references. To be published in Phys. Rev. Lett

Published
1995
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4. COALESCING NEUTRON STARS AS GAMMA RAY BURSTERS ?

Author

Ruffert, M., Janka, H. -Th., Keil, W., and Schaefer, G.

Subjects
Astrophysics
Abstract

We investigate the dynamics and evolution of coalescing neutron stars. The three-dimensional Newtonian equations of hydrodynamics are integrated by the `Piecewise Parabolic Method' However, we do include the effects of the emission of gravitational waves on the hydrodynamics. The properties of neutron star matter are described by the equation of state of Lattimer & Swesty. In addition to the fundamental hydrodynamic quantities, density, momentum, and energy, we follow the time evolution of the electron density in the stellar gas. Energy losses and changes of the electron abundance due to the emission of neutrinos are taken into account by an elaborate ``neutrino leakage scheme'', which employs a careful calculation of the lepton number and energy source terms of all neutrino types. The grid is Cartesian and equidistant with a resolution of 64**3 or 128**3, which allows us to calculate the self-gravity via fast Fourier transforms., Comment: extended abstract contribution to the proceedings of the 17th Texas Symposium, 2 pages, uuencoded compressed postscript.

Published
1995
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6. Traumatologie und gewaltsamer Tod

Author

Wegener, R., Wehner, H.-D., Oehmichen, M., Banaschak, S., Madea, B., Bratzke, H., Pollak, S., Maxeiner, H., Keil, W., Schmidt, R., Lignitz, E., Dettmeyer, R., Geserick, G., and Madea, Burkhard, editor

Published
2003
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23. Abstracts

Author

Kaatsch, Hans-Jürgen, Püschel, K., Heinemann, A., Klaas, Jakob, Graß, Hildegard, Staak, Michael, Benthaus, S., Vock, R., Brinkmann, B., Temme, O., Daldrup, T., Dilger, M., Fink, T., Rittner, Ch., Thali, Michael J., Braun, M., Brueschweiler, W., Kneubuehl, B. P., Vock, P., Wirth, J., Dirnhofer, R., Bohnert, M., Berger, H., Buck, U., Pollak, S., Gotta, J. C., Erdmann, F., Riße, M., Schütz, H., Weiler, G., Pragst, F., Auwärter, V., Sporkcrt, F., Roewer, L., Willuweit, S., Kayser, M., Nagy, M., de Knijff, P., Geserick, G., Augustin, C., Betz, A., Carracedo, A., Corach, D., Dupuy, B. M., Gusmaõ, L., Henke, L., Hidding, M., Kärgel, H. J., Lessig, R., Liebeherr, E., Parson, W., Pascali, V. L., Rolf, B., Schneider, P. M., Dobosz, T., Teifel-Greding, J., Krawczak, M., Bauer, M., Patzelt, D., Kuznik, J., Bondy, B., Eisenmenger, W., Möller, H. -J., Zehner, R., Niess, C., Amendt, J., Krettek, R., Weinmann, W., Görner, M., Goerke, R., Mahler, H., Fowinkel, C., Haarhoff, K., Schmidt, P., Schmolke, C., Mußhoff, F., Menzen, M., Prohaska, C., Madea, B., Kauert, G., Gleicher, S., Drasch, G., von Meyer, L., Roider, G., Quitterer, D., Kröner, L., Toennes, S. W., Jurowich, S., Käferstein, H., Sticht, G., Gilg, T., Priemer, F., Jocham, N., Fechner, G., Ortmann, Ch., Schulte, T., Nieschalk, M., Weirich, V., Rummel, J., Rentsch, D., Wegener, R., Berehaus, G., Graß, H., Grellner, W., Rettig-Stürmer, A., Kühn-Becker, H., Georg, T., Möller, M., Wilske, J., Kemmerling, R., Sachs, H., Menting, T., Musshoff, F., Schoenemeier, S., Bürrig, K. -F., Jacob, B., Bonte, W., Maeda, H., Zhu, B. -L., Fujita, M. Q., Quan, L., Ishida, K., Taniguchi, M., Böhme, B., Rauch, E., Penning, R., Amberg, R., Blackwell, C. C., Pelz, K., Meier, V., Saternus, K. -S., Gessler, F., Böhnel, H., Bouska, I., Toupalík, P., Klir, P., Kleemann, W. J., Ast, F., Beck, U., Debertin, S., Giebe, B., Heide, S., Sperhake, J., Poets, C. F., Weis, C., Schlaud, M., Bajanowski, T., Wedekind, H., Breithardt, G., Debertin, A. S., Tönjes, H., Tschernig, T., Pabst, R., Tröger, H. D., Krill, A., Hame, M., Bouška, I., Ježková, J., Kernbach-Wighton, G., Wense, A. v. d., Kijewski, H., Goeke, M., Weber, B., Staak, M., Dettmeyer, R., Driever, F., Becker, A., Wiestler, O. D., Verhoff, M. A., Woenckhaus, J., Hauri-Bionda, R., Strehler, M., Bär, W., Ohshima, T., Takayasu, T., Kondo, T., Sato, Y., Tarbah, Fuad A., Mahler, Hellmut, Temme, Oliver, Daldrup, Thomas, Pötsch, Lucia, Emmerich, Patricia, Skopp, Gisela, Andresen, H., Schmoldt, A., Thurau, K., Vogt, S., Große-Perdekamp, M., Pufal, E., Sykutera, M., Rochholz, G., Lis, G., Sliwka, K., Zörntlein, S., Röhrich, J., Pötsch, L., Becker, J., Mattern, Rainer, Yamamoto, Yoshiko, Hayase, Tamaki, Yamamoto, Keiichi, Piette, Michel H. A., De Letter, Els A., Cordonnier, Jan, Schultes, A., Pluisch, F., Darok, M., Kollroser, M., Mannweiler, S., Babel, B., Magerl, H., Mahfoud, B., Stein, S., Iwersen-Bergmann, S., Risser, D., Hönigschnabl, S., Stichenwirth, M., Sebald, D., Kaff, A., Schneider, B., Vycudilik, W., Bauer, G., Reitz, E., Kimont, H. -G., Molnár, A., Jeszenszky, E., Benkó, A., Száz, E., Varga, T., Mayr, N. P., Schmidbauer, S., Hallfeldt, K., Bank, A., Iffland, R., Schuff, A., Fischer, T., Weingarten, Y., Alt, A., Janda, I., Wurst, F. M., Seidl, S., Seitler, C., Haag-Dawoud, Munira, Beike, J., Vennemann, B., Köhler, H., Hendreich, F. -I., Giebe, W., Reimann, I., Werner, R., Klein, A., Schulz, K., Feischer, D., Erfurt, Ch., Arnold, R., Winnefeld, K., Riepert, T., Iffland, R., Longauer, F., Kardošovå, V., Anders, S., Hildebrand, E., Schulz, F., Möbus, U., Jaroß, W., Wittig, H., Schmidt, U., Hauptmann, K., Krause, D., Prudlow, B., Rohner, T., Molz, G., Früchtnicht, W., Hoppe, B., Henßge, C., Althaus, L., Herbst, J., Preiß, U., Stein, C., Glenewinkel, F., Leinzinger, E. P., Lászik, A., Soós, M., Hubay, M., Sótonyi, P., Schliff, A., Gatternig, R., Hering, S., Edelmann, J., Plate, I., Michael, M., Kuhlisch, E., Szibor, R., von Wurmb, N., Hammer, U., Meissner, D., Kirches, E., Dietzmann, K., Pfeiffer, H., Ortmann, C., Meißner, C., Mohamed, S. A., Warnk, H., Gehlsen-Lorenzen, A., Oehmichen, M., Heidorn, F., Henkel, R., Schulz, M. M., Reichert, W., Mattern, R., Baasner, A., Banaschak, S., Schäfer, C., Benecke, M., Reibe, S., Barksdale, Larry, Sundermeier, Jon, Ratcliffe, Brett C., Lutz, S., Hohoff, C., Schürenkamp, M., Kahle, C., Fieguth, A., Ritz-Timme, S., Laumeier, I., Schütz, H. W., Schulte-Mönting, J., Chaudri, S., Welti, M., Dittmann, V., Olze, A., Schmeling, A., Reisinger, W., Klotzbach, H., Gabriel, P., Demir, T., Huckenbeck, W., Reuhl, J., Schuster, R., Maxeiner, H., Bockholdt, B., Jachau, K., Kuchheuser, W., Försterling, T., Ehrlich, E., Besselmann, M., Du Chesne, A., Albrecht, U. -V., Guan, D. W., Dreßler, J., Voigtmann, K., Müller, E., Vieler, S., Kirchner, A., Humpert, M., Breitmeier, D., Mansouri, F., Wyler, D., Marty, W., Sigrist, Th., Zollinger, U., Meyer, U., Allmen, G. v., Karger, B., Hoekstra, A., Stehmann, B., Schmidt, P. F., Peschel, O., Vollmar, C., Szeimies, U., Rothschild, M. A., Kegel, D., Klatt, A., Klatt, C., Briese, B. -H., Schyma, C., Schyma, P., Angetter, Daniela, Perdekamp, M. Große, Sun, Y., Guttenberge, R., Riede, U. -N., Poetsch, M., Seefeldt, S., Maschke, M., Lignitz, E., Zeller, M., Wehner, H. -D., Czarnetzki, A., Blin, N., Bender, K., Emmerich, P., Pádár, Zs., Egyed, B., Kemény, G., Woller, J., Füredi, S., Balogh, I., Cremer, U., Scheil, H. -G., Schiwy-Bochat, K. -H., Althoff, H., Immel, U. -D., Tatschner, Th., Lang, C., Versmold, D., Reineke, Th., Mall, G., Dahlmann, F., Büttner, A., Hubig, M., Rötzscher, K., Grundmann, C., Oritani, S., Peter, J., Popov, V., Olejnik, V., Khokhlov, V. D., Stiller, D., Romanowski, U., Kleiber, M., Klupp, N., Mortinger, H., Chadová, L., Bouška, I., Toupalik, P., Schnabel, A., Lutz, F. -U., Crivellaro, A., Strauch, H., Dan, Dermengiu, Silvia, Dermengiu, Buda, Octavian, Kandolf, R., Kaiser, R., Eis-Hübinger, A. M., Kobek, M., Jankowski, Z., Rygol, K., Kulikowska, J., Martin, H., Kolbow, K., Keil, W., Wang, Huijun, Ding, Yanqing, Huang, Guangzhao, Wu, Zhongbi, Wehner, F., Subke, J., Zdravkovic, M., Otasevic, V., Rostov, M., Karadzic, R., Kildüschov, E. M., Buromski, I. W., Plaksin, W. O., Wendland, A., Spiridonow, W. A., Sabusow, J. G., Kalinin, J. P., Heide, S., Schmidt, V., Wiegand, P., Kleiber, M., Demmler, G., Zack, F., Reischle, S., Schönpflug, M., Beier, G., Berchtenbreiter, C., Lackner, K., Jendrusch, B., Wolf, H., Buhmann, D., Summa, H., Matschke, J., Stürenburg, H. J., Junge, M., Wischhusen, F., Müldner, C., Schröder, A., Kaiser, E., Lasczkowski, G., Hofbauer, V., Eberl, N., Thomson, H., Tatschner, T., Milz, S., Gazov, E., Trübner, K., Brenner, M., Tsokos, M., Anders, S., Paulsen, F., Reith, K., Bratzke, H., Schapfeld, R., Graefe-Kirci, U., Stiller, D., Trübner, K., and Schäfer, A. Th.

Published
2000
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38. Test of time reversal invariance in the decay K+ → π0μ+ν

Author

Abe, M., Aoki, M., Arai, I., Asano, Y., Baker, T., Blecher, M., Chapman, M.D., Dementyev, D.V., Depommier, P., Grigoriev, M.P., Gumplinger, P., Hasinoff, M., Henderson, R., Horie, K., Hou, W.S., Huang, H.C., Igarashi, Y., Ikeda, T., Imazato, J., Ivashkin, A.P., Kang, J.H., Keil, W., Khabibullin, M.M., Khotyantsev, A.N., Kudenko, Yu.G., Kuno, Y., Lee, J.-M., Lee, K.S., Lim, G.Y., Macdonald, J.A., Marlow, D.R., Mindas, C.R., Mineev, O.V., Rangacharyulu, C., Sahu, S.K., Sekikawa, S., Shibata, K., Shimizu, H.M., Shimizu, S., Shin, Y.-M., Shin, Y.H., Sim, K.S., Suzuki, A., Tashiro, T., Watanabe, A., Wright, D., and Yokoi, T.

Published
2000
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48. New result on measurement of T-violating muon polarization in K-mu 3 decay

Author

Abe, M, Aoki, M, Arai, I, Asano, Y, Baker, T, Blecher, M, Chapman, MD, Dementyev, D, Depommier, P, Grigoriev, M, Gumplinger, P, Hasinoff, M, Henderson, R, Horie, K, Hou, W, Huang, H, Igarashi, Y, Ikeda, T, Imazato, J, Ivashkin, A, Kang, J, Keil, W, Khabibullin, M, Khotyantsev, A, and Kudenko, Y

Abstract

A measurement of the transverse mu (+) polarization, P-T, in K+ --> pi (0)mu (+)nu decay was performed using stopped kaons. For 1996-1997 data the results are P-T = -0.0042 +/- 0.0049(stat) +/- 0.0009(syst) and Im(xi) = -0.013 +/- 0.016(stat)+/- 0.003(syst), where Im(xi) is T-violating physics parameter.

Published
2016

50. Test of time reversal invariance in K-mu 3 decay

Author

Kuno, Y, Abe, M, Aoki, M, Arai, I, Asano, Y, Baker, T, Blecher, M, Chapman, MD, Dementyev, D, Depommier, P, Grigorjev, M, Gumplinger, P, Hasinoff, M, Henderson, R, Horie, K, Hou, W, Huang, H, Igarashi, Y, Ikeda, T, Imazato, J, Ivashkin, A, Kang, J, Keil, W, Khabibullin, M, and Khotjantsev, A

Abstract

An experiment E246 at the 12-GeV proton synchrotron at KEK (KEK-PS), which is searching for the T-violating transverse muon polarization (P-mu(perpendicular to)) in K+ --> pi (0)mu (+)nu decay, is described. The search is sensitive to new mechanisms of T or CP violation beyond the Standard Model. The initial results of P-mu(perpendicular to) = -0.0042+/-0.0049(stat.)+/-0.0009(syst.) and the T-violating parameter Im(xi) = -0.013+/- 0.016(stat.) +/- 0.003(syst.) were determined from the data taken in 1996 and 1997.

Published
2016

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