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419 results on '"Hoffmann D.H.H."'

1. Exclusive measurements of nuclear breakup reactions of 17Ne

Author

Wamers F., Marganiec J., Aksouh F., Aksyutina Yu., Álvarez-Pol H., Aumann T., Beceiro-Novo S., Bertulani C.A., Boretzky K., Borge M.J.G., Chartier M., Chatillon A., Chulkov L.V., Cortina-Gil D., Egorova I.A., Emling H., Ershova O., Forssén C., Fraile L.M., Fynbo H., Galaviz D., Geissel H., Grigorenko L.V., Heil M., Hoffmann D.H.H., Hoffmann J., Johansson H., Jonson B., Karagiannis C., Karakoç M., Kiselev O.A., Kratz J.V., Kulessa R., Kurz N., Langer C., Lantz M., Larsson K., Bleis T. Le, Lemmon R., Litvinov Yu.A., Mahata K., Müntz C., Nilsson T., Nociforo C., Nyman G., Ott W., Panin V., Parfenova Yu.L., Paschalis S., Perea A., Plag R., Reifarth R., Richter A., Rodriguez-Tajes C., Rossi D., Riisager K., Savran D., Schrieder G., Shul’gina N.B., Simon H., Stroth J., Sümmerer K., Taylor J., Tengblad O., Tengborn E., Weick H., Wimmer C., and Zhukov M.V.

Subjects
Physics, QC1-999
Abstract

We have studied one-proton-removal reactions of about 500MeV/u 17Ne beams on a carbon target at the R3B/LAND setup at GSI by detecting beam-like 15O-p and determining their relative-energy distribution. We exclusively selected the removal of a 17Ne halo proton, and the Glauber-model analysis of the 16F momentum distribution resulted in an s2 contribution in the 17Ne ground state of about 40%.

Published
2014
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5. An update on the Axion Helioscopes front: current activities at CAST and the IAXO project

Author

Dafni, T., Arik, M., Armengaud, E., Aune, S., Avignone, F.T., Barth, K., Belov, A., Betz, M., Bräuninger, H., Brax, P., Breijnholt, N., Brun, P., Cantatore, G., Carmona, J.M., Carosi, G.P., Caspers, F., Caspi, S., Cetin, S.A., Chelouche, D., Christensen, F.E., Collar, J.I., Dael, A., Davenport, M., Derbin, A.V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galán, J., García, J.A., Gardikiotis, A., Garza, J.G., Gazis, E.N., Georgiopoulou, E., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González-Díaz, D., Gruber, E., Guendelman, E., Guthörl, T., Hailey, C.J., Hartmann, R., Hauf, S., Haug, F., Hasinoff, M.D., Hiramatsu, T., Hoffmann, D.H.H., Horns, D., Iguaz, F.J., Irastorza, I.G., Isern, J., Imai, K., Jacoby, J., Jaeckel, J., Jakobsen, A.C., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Königsmann, K., Kotthaus, R., Krčmar, M., Kousouris, K., Krieger, C., Kuster, M., Lakić, B., Laurent, J.M., Limousin, O., Lindner, A., Liolios, A., Ljubičić, A., Luzón, G., Matsuki, S., Muratova, V.N., Neff, S., Niinikoski, T., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M.J., Raffelt, G., Redondo, J., Riege, H., Ringwald, A., Rodríguez, A., Rosu, M., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y.K., Shilon, I., Sikivie, P., Silva, H., Solanki, S.K., Stewart, L., ten Kate, H.H.J., Tomas, A., Troitsky, S., Vafeiadis, T., van Bibber, K., Vedrine, P., Villar, J.A., Vogel, J.K., Walckiers, L., Weltman, A., Wester, W., Yildiz, S.C., and Zioutas, K.

Published
2016
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7. The Next Generation of Axion Helioscopes: The International Axion Observatory (IAXO)

Author

Vogel, J.K., Armengaud, E., Avignone, F.T., Betz, M., Brax, P., Brun, P., Cantatore, G., Carmona, J.M., Carosi, G.P., Caspers, F., Caspi, S., Cetin, S.A., Chelouche, D., Christensen, F.E., Dael, A., Dafni, T., Davenport, M., Derbin, A.V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Galán, J., García, J.A., Garza, J.G., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González-Díaz, D., Guendelman, E., Hailey, C.J., Hiramatsu, T., Hoffmann, D.H.H., Horns, D., Iguaz, F.J., Irastorza, I.G., Isern, J., Imai, K., Jakobsen, A.C., Jaeckel, J., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Krčmar, M., Kousouris, K., Krieger, C., Lakić, B., Limousin, O., Lindner, A., Liolios, A., Luzón, G., Matsuki, S., Muratova, V.N., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M.J., Raffelt, G., Redondo, J., Ringwald, A., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y.K., Shilon, I., Sikivie, P., Silva, H., ten Kate, H., Tomas, A., Troitsky, S., Vafeiadis, T., van Bibber, K., Vedrine, P., Villar, J.A., Walckiers, L., Weltman, A., Wester, W., Yildiz, S.C., and Zioutas, K.

Published
2015
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10. Unveiling the two-proton halo character of Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author

Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C.A., Boretzky, K., Borge, M.J.G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L.V., Cortina-Gil, D., Díaz Fernández, P., Emling, H., Ershova, O., Fraile, L.M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D.H.H., Holl, M., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O.A., Kratz, J.V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu.A., Löher, B., Mahata, K., Marganiec-Galązka, J., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Weick, H., and Wimmer, C.

Abstract

The proton drip-line nucleus $^{17}$Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the $^{17}$Ne(p,2p)16F→15⁎O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of $^{16}$F into $^{15}$O (including γ decays from excited states) and a proton, as well as the $^{15}$O+p relative-energy spectrum and the $^{16}$F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l=0 and l=2 motion of the valence protons in $^{17}$Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that $^{17}$Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the $^{15}$O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Published
2022

11. Unveiling the Two-Proton Halo Character of 17Ne: Exclusive Measurement of Quasi-free Proton-Knockout Reactions

Author

Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Technische Universität Darmstadt, Swedish Research Council, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Aumann, T. [0000-0003-1660-9294], Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu., Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C.A., Boretzky, K., García Borge, María José, Caesar, C., Chartier, M., Chatillon, A., Chulkov, L.V., Cortina-Gil, D., Diaz Fernandez, P., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D.H.H., Holl, M., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Bleis, T. Le, Lemmon, R., Litvinov, Yu. A., Loeher, B., Mahata, K., Marganiec-Galazka, J., Muentz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, R., Simon, H., Stroth, J., Suemmerer, K., Tengblad, Olof, Weick, H., Wimmer, C., Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Technische Universität Darmstadt, Swedish Research Council, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Aumann, T. [0000-0003-1660-9294], Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu., Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C.A., Boretzky, K., García Borge, María José, Caesar, C., Chartier, M., Chatillon, A., Chulkov, L.V., Cortina-Gil, D., Diaz Fernandez, P., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D.H.H., Holl, M., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Bleis, T. Le, Lemmon, R., Litvinov, Yu. A., Loeher, B., Mahata, K., Marganiec-Galazka, J., Muentz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, R., Simon, H., Stroth, J., Suemmerer, K., Tengblad, Olof, Weick, H., and Wimmer, C.

Abstract

The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F->15O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including gamma decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the ratio of l=0 and l=2 motion of the valence protons in 17Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Published
2022

12. Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author

Lehr, C., primary, Wamers, F., additional, Aksouh, F., additional, Aksyutina, Yu., additional, Álvarez-Pol, H., additional, Atar, L., additional, Aumann, T., additional, Beceiro-Novo, S., additional, Bertulani, C.A., additional, Boretzky, K., additional, Borge, M.J.G., additional, Caesar, C., additional, Chartier, M., additional, Chatillon, A., additional, Chulkov, L.V., additional, Cortina-Gil, D., additional, Díaz Fernández, P., additional, Emling, H., additional, Ershova, O., additional, Fraile, L.M., additional, Fynbo, H.O.U., additional, Galaviz, D., additional, Geissel, H., additional, Heil, M., additional, Heine, M., additional, Hoffmann, D.H.H., additional, Holl, M., additional, Johansson, H.T., additional, Jonson, B., additional, Karagiannis, C., additional, Kiselev, O.A., additional, Kratz, J.V., additional, Kulessa, R., additional, Kurz, N., additional, Langer, C., additional, Lantz, M., additional, Le Bleis, T., additional, Lemmon, R., additional, Litvinov, Yu.A., additional, Löher, B., additional, Mahata, K., additional, Marganiec-Galązka, J., additional, Müntz, C., additional, Nilsson, T., additional, Nociforo, C., additional, Ott, W., additional, Panin, V., additional, Paschalis, S., additional, Perea, A., additional, Plag, R., additional, Reifarth, R., additional, Richter, A., additional, Riisager, K., additional, Rodriguez-Tajes, C., additional, Rossi, D., additional, Savran, D., additional, Scheit, H., additional, Schrieder, G., additional, Schrock, P., additional, Simon, H., additional, Stroth, J., additional, Sümmerer, K., additional, Tengblad, O., additional, Weick, H., additional, and Wimmer, C., additional

Published
2022
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17. Prospects for the CERN Axion Solar Telescope sensitivity to 14.4 keV axions

Author

Jakovčić, K., Andriamonje, S., Aune, S., Avignone, F., Barth, K., Belov, A., Beltrán, B., Bräuninger, H., Carmona, J.M., Cebrián, S., Collar, J.I., Dafni, T., Davenport, M., Di Lella, L., Eleftheriadis, C., Fanourakis, G., Ferrer Ribas, E., Fischer, H., Franz, J., Friedrich, P., Geralis, T., Giomataris, I., Gninenko, S., Hasinoff, M.D., Heinsius, F.H., Hoffmann, D.H.H., Irastorza, I.G., Jacoby, J., Kang, D., Königsmann, K., Kotthaus, R., Krčmar, M., Kousouris, K., Kuster, M., Lakić, B., Lasseur, C., Liolios, A., Ljubičić, A., Lutz, G., Luzón, G., Miller, D.W., Morales, A., Morales, J., Ortiz, A., Papaevangelou, T., Placci, A., Raffelt, G., Ruz, J., Riege, H., Semertzidis, Y., Serpico, P., Stewart, L., Vieira, J.D., Villar, J., Vogel, J., Walckiers, L., and Zioutas, K.

Published
2007
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20. High-energy-density physics experiments with intense heavy ion beams

Author

Varentsov, D., Ternovoi, V. Ya., Kulish, M., Fernengel, D., Fertman, A., Hug, A., Menzel, J., Ni, P., Nikolaev, D.N., Shilkin, N., Turtikov, V., Udrea, S., Fortov, V.E., Golubev, A.A., Gryaznov, V.K., Hoffmann, D.H.H., Kim, V., Lomonosov, I.V., Mintsev, V., Sharkov, B.Yu., Shutov, A., Spiller, P., Tahir, N.A., and Wahl, H.

Published
2007
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23. Laser ion acceleration with micro-grooved targets

Author

Schollmeier, Marius, Roth, M., Blazevic, A., Brambrink, E., Cobble, J.A., Fernandez, J.C., Flippo, K.A., Gautier, D.C., Habs, D., Harres, K., Hegelich, B.M., Heßling, T., Hoffmann, D.H.H., Letzring, S., Nürnberg, F., Schaumann, G., Schreiber, J., and Witte, K.

Published
2007
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28. Initiation of long, free-standing z discharges by CO2 laser gas heating

Author

Niemann, C., Birkner, R., Hoffmann, D.H.H., Presura, R., Yu, S.S., Sharp, W.M., Tauschwitz, A., Penache, D., Neff, S., and Knobloch, R.

Subjects
Gases -- Observations, Gases -- Electric properties, Gases -- Mechanical properties, Ammonia -- Electric properties, Carbon dioxide lasers -- Mechanical properties, Carbon dioxide lasers -- Electric properties, Physics
Abstract

The laser-gas interaction and the discharge initiation mechanism are presented. Resonant CO2 laser heating of low-pressure ammonia gas was applied to initiate 50 cm long, free-standing discharge channels.

Published
2002

29. The cern axion solar telescope (CAST): an update

Author

Andriamonje, S., Arsov, V., Aune, S., Aune, T., Avignone, F.T., III, Barth, K., Belov, A., Beltran, B., Bräuninger, H., Carmona, J., Cebrián, S., Chesi, E., Cipolla, G., Collar, J., Creswick, R., Dafni, T., Davenport, M., Dedousis, S., Delattre, M., Delbart, A., DeOliveira, R., DiLella, L., Eleftheriadis, C., Engelhauser, J., Fanourakis, G., Farach, H., Ferrer, E., Fischer, H., Formenti, F., Franz, J., Friedrich, P., Geralis, T., Giomataris, I., Gninenko, S., Golubev, N., Hartmann, R., Hasinoff, M., Heinsius, F-H., Hoffmann, D.H.H., Irastorza, I., Jacoby, J., Joux, J-N., Kang, D., Königsmann, K., Kotthaus, R., Krcmar, M., Kuster, M., Lakic, B., Lasseur, C., Liolios, A., Lippitsch, A., Ljubicic, A., Lutz, G., Luzon, G., Morales, A., Morales, J., Mutterer, M., Nikolaidis, A., de Solorzano, A. Ortiz, Papaevangelou, T., Placci, A., Raffelt, G., Rammos, P., Robert, J.P., Ruz, J., Sarsa, M., Schill, C., Serber, W., Semertzidis, Y., Vieira, J., Villar, J., Vullierme, B., Walckiers, L., and Zioutas, K.

Published
2005
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32. Toward inertial confinement fusion energy based on heavy ion beam

Author

Kawata, S., Okamura, M., Horioka, K., Deutsch, C., Karino, T., Hoffmann, D.H.H., Zhao, Y., Ikeda, S., Kanesue, T., Ogoyski, A.I., Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and HEP, INSPIRE

Subjects
Plasma Physics (physics.plasm-ph), Accelerator Physics (physics.acc-ph), [PHYS.PHYS.PHYS-GEN-PH] Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], FOS: Physical sciences, [PHYS.PHYS.PHYS-ACC-PH] Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Physics - Accelerator Physics, Physics - Plasma Physics, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph]
Abstract

Heavy ion inertial fusion (HIF) energy would be one of promising energy resources securing our future energy in order to sustain our human life for centuries and beyond. The heavy ion beam (HIB) has remarkable preferable features to release the fusion energy in inertial confinement fusion: in particle accelerators HIBs are generated with a high driver efficiency of ~ 30-40%, and the HIB ions deposit their energy inside of materials. Therefore, a requirement for the fusion target energy gain is relatively low, that would be ~50-70 to operate a HIF fusion reactor with the standard energy output of 1GW of electricity. The HIF reactor operation frequency would be ~10~15 Hz or so. Several-MJ HIBs illuminate a fusion fuel target, and the fuel target is imploded to about a thousand times of the solid density. Then the DT fuel is ignited and burned. The HIB ion deposition range would be ~0.5-1 mm or so depending on the material. Therefore, a relatively large density-scale length appears in the fuel target material. The large density-gradient-scale length helps to reduce the Rayleigh-Taylor (R-T) growth rate. The key merits in HIF physics are presented in the article toward our bright future energy resource., Comment: 17 pages. arXiv admin note: substantial text overlap with arXiv:1511.06508, arXiv:1608.01063

Published
2020
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35. Shock compressibility and spall strength of textolite depending on fiber orientation

Author

Mochalova, V. M., Utkin, A.V., Rykova, V.E., Endres, M., and Hoffmann, D.H.H.

Abstract

The experimental study of shock wave compressibility and spall strength of an aramid fiber reinforced epoxy composite (textolite) for two fiber orientations was performed by the VISAR interferometer. The particle velocity profiles were obtained at velocities of the flyer plate from 0.65 to 5.05 km/s. The sound speed of textolite for the longitudinal direction is three times higher than that for transverse one, and as a result, the particle velocity profiles are different for two orientations. For the transverse direction of the fibers, a single shock wave is observed, while for longitudinal one, a two-wave configuration is recorded up to 20 GPa. Hugoniot parameters for both orientations of the fibers were found up to 35 GPa: D = 2.37 + 1.26 ∗ u – for transverse one and D = 1.45 + 2.05 ∗ u – for longitudinal, where D is the shock wave velocity and u is the particle velocity. The spall strength of textolite is equal to 61 MPa for shocks traveling along the fibers, and this is almost twice higher than that for the transverse direction.

Published
2019
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36. First results on the search for chameleons with the KWISP detector at CAST

Author

Arguedas Cuendis, S., primary, Baier, J., additional, Barth, K., additional, Baum, S., additional, Bayirli, A., additional, Belov, A., additional, Bräuninger, H., additional, Cantatore, G., additional, Carmona, J.M., additional, Castel, J.F., additional, Cetin, S.A., additional, Dafni, T., additional, Davenport, M., additional, Dermenev, A., additional, Desch, K., additional, Döbrich, B., additional, Fischer, H., additional, Funk, W., additional, García, J.A., additional, Gardikiotis, A., additional, Garza, J.G., additional, Gninenko, S., additional, Hasinoff, M.D., additional, Hoffmann, D.H.H., additional, Iguaz, F.J., additional, Irastorza, I.G., additional, Jakovčić, K., additional, Kaminski, J., additional, Karuza, M., additional, Krieger, C., additional, Lakić, B., additional, Laurent, J.M., additional, Luzón, G., additional, Maroudas, M., additional, Miceli, L., additional, Neff, S., additional, Ortega, I., additional, Ozbey, A., additional, Pivovaroff, M.J., additional, Rosu, M., additional, Ruz, J., additional, Chóliz, E. Ruiz, additional, Schmidt, S., additional, Schumann, M., additional, Semertzidis, Y.K., additional, Solanki, S.K., additional, Stewart, L., additional, Tsagris, I., additional, Vafeiadis, T., additional, Vogel, J.K., additional, Vretenar, M., additional, Yildiz, S.C., additional, and Zioutas, K., additional

Published
2019
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45. Simulations of full impact of the Large Hadron Collider beam with a solid graphite target

Author

Tahir, N.A., Schmidt, R., Brugger, M., Shutov, A., Lomonosov, I.V., Piriz, A.R., and Hoffmann, D.H.H.

Subjects
Physics::Accelerator Physics
Abstract

The Large Hadron Collider (LHC) will operate with 7TeV/c protons with a luminosity of 1034cm−2s−1. This requires two beams, each with 2808 bunches. The nominal intensity per bunch is 1.15×1011 protons and the total energy stored in each beam is 362 MJ. In previous papers, the mechanisms causing equipment damage in case of a failure of the machine protection system was discussed, assuming that the entire beam is deflected onto a copper target. Another failure scenario is the deflection of beam, or part of it, into carbon material. Carbon collimators and beam absorbers are installed in many locations around the LHC close to the beam, since carbon is the material that is most suitable to absorb the beam energy without being damaged. In case of a failure, it is very likely that such absorbers are hit first, for example, when the beam is accidentally deflected. Some type of failures needs to be anticipated, such as accidental firing of injection and extraction kicker magnets leading to a wrong deflection of a few bunches. Protection of LHC equipment relies on the capture of wrongly deflected bunches with beam absorbers that are positioned close to the beam. For maximum robustness, the absorbers jaws are made out of carbon materials. It has been demonstrated experimentally and theoretically that carbon survives the impact of a few bunches expected for such failures. However, beam absorbers are not designed for major failures in the protection system, such as the beam dump kicker deflecting the entire beam by a wrong angle. Since beam absorbers are closest to the beam, it is likely that they are hit first in any case of accidental beam loss. In the present paper we present numerical simulations using carbon as target material in order to estimate the damage caused to carbon absorbers in case of major beam impact

Published
2017

47. X-ray radiation from ions with K-shell vacancies

Author

Rosmej, F.B., Funk, U.N., Geißel, M., Hoffmann, D.H.H., Tauschwitz, A., Faenov, A.Ya., Pikuz, T.A., Skobelev, I.Yu., Flora, F., Bollanti, S., Lazzaro, P.Di., Letardi, T., Grilli, A., Palladino, L., Reale, A., Tomassetti, G., Scafati, A., Reale, L., Auguste, T., D'Oliveira, P., Hulin, S., Monot, P., Maksimchuk, A., Pikuz, S.A., Umstadter, D., Nantel, M., Bock, R., Dornik, M., Stetter, M., Stöwe, S., Yakushev, V., Kulisch, M., and Shilkin, N.

Published
2000
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48. Improved search for solar chameleons with a GridPix detector at CAST

Author

Anastassopoulos, V., primary, Aune, S., additional, Barth, K., additional, Belov, A., additional, Bräuninger, H., additional, Cantatore, G., additional, Carmona, J.M., additional, Castel, J.F., additional, Cetin, S.A., additional, Christensen, F., additional, Dafni, T., additional, Davenport, M., additional, Dermenev, A., additional, Desch, K., additional, Döbrich, B., additional, Eleftheriadis, C., additional, Fanourakis, G., additional, Ferrer-Ribas, E., additional, Fischer, H., additional, Funk, W., additional, Garc𝚤a, J.A., additional, Gardikiotis, A., additional, Garza, J.G., additional, Gazis, E.N., additional, Geralis, T., additional, Giomataris, I., additional, Gninenko, S., additional, Hailey, C.J., additional, Hasinoff, M.D., additional, Hoffmann, D.H.H., additional, Iguaz, F.J., additional, Irastorza, I.G., additional, Jakobsen, A., additional, Jacoby, J., additional, Jakovčić, K., additional, Kaminski, J., additional, Karuza, M., additional, Kostoglou, S., additional, Kralj, N., additional, Krčmar, M., additional, Krieger, C., additional, Lakić, B., additional, Laurent, J. M., additional, Liolios, A., additional, Ljubičić, A., additional, Luzón, G., additional, Maroudas, M., additional, Miceli, L., additional, Neff, S., additional, Ortega, I., additional, Papaevangelou, T., additional, Paraschou, K., additional, Pivovaroff, M.J., additional, Raffelt, G., additional, Rosu, M., additional, Ruz, J., additional, Chóliz, E. Ruiz, additional, Savvidis, I., additional, Schmidt, S., additional, Semertzidis, Y.K., additional, Solanki, S.K., additional, Stewart, L., additional, Vafeiadis, T., additional, Vogel, J.K., additional, Vretenar, M., additional, Wuensch, W., additional, Yildiz, S.C., additional, Zioutas, K., additional, and Brax, P., additional

Published
2019
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49. Comparison of electromagnetic and nuclear dissociation of Ne-17.

Author

Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, Ministerio de Economía y Competitividad (España), Wamers, F., Marganiec, J., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Aumann, T., Beceiro Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D.H.H., Hoffman, J., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lehr, C., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodríguez-Tajes, C., Rossi, D., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Typel, S., Weick, H., Wiescher, M., Wimmer, C., Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, Ministerio de Economía y Competitividad (España), Wamers, F., Marganiec, J., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Aumann, T., Beceiro Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D.H.H., Hoffman, J., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lehr, C., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodríguez-Tajes, C., Rossi, D., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Typel, S., Weick, H., Wiescher, M., and Wimmer, C.

Abstract

The Borromean drip-line nucleus Ne-17 has been suggested to possess a two-proton halo structure in its ground state. In the astrophysical rp-process, where the two-proton capture reaction O-15(2p,gamma) Ne-17 plays an important role, the calculated reaction rate differs by several orders of magnitude between different theoretical approaches. To add to the understanding of the Ne-17 structure we have studied nuclear and electromagnetic dissociation. A 500 MeV/u Ne-17 beam was directed toward lead, carbon, and polyethylene targets. Oxygen isotopes in the final state were measured in coincidence with one or two protons. Different reaction branches in the dissociation of Ne-17 were disentangled. The relative populations of s and d states in F-16 were determined for light and heavy targets. The differential cross section for electromagnetic dissociation (EMD) shows a continuous internal energy spectrum in the three-body system O-15 + 2p. The Ne-17 EMD data were compared to current theoretical models. None of them, however, yields satisfactory agreement with the experimental data presented here. These new data may facilitate future development of adequate models for description of the fragmentation process.

Published
2018

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