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127 results on '"Fraile, Luis M."'

1. In vivo production of fluorine-18 in a chicken egg tumor model of breast cancer for proton therapy range verification

Author: España, Samuel, Sánchez-Parcerisa, Daniel, Bragado, Paloma, Gutiérrez-Uzquiza, Álvaro, Porras, Almudena, Gutiérrez-Neira, Carolina, Espinosa, Andrea, Onecha, Víctor V., Ibáñez, Paula, Sánchez-Tembleque, Víctor, Udías, José M., and Fraile, Luis M.
Published: 2022
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2. Coulomb dissociation of $^{20,21}$N

Author: Röder, Marko, Adachi, Tatsuya, Aksyutina, Yulia, Alcantara, Juan, Altstadt, Sebastian, Alvarez-Pol, Hector, Ashwood, Nicholas, Atar, Leyla, Aumann, Thomas, Avdeichikov, Vladimir, Barr, M., Beceiro, Saul, Bemmerer, Daniel, Benlliure, Jose, Bertulani, Carlos, Boretzky, Konstanze, Borge, Maria J. G., Burgunder, G., Caamano, Manuel, Caesar, Christoph, Casarejos, Enrique, Catford, Wilton, Cederkall, Joakim, Chakraborty, S., Chartier, Marielle, Chulkov, Leonid, Cortina-Gil, Dolores, Crespo, Raquel, Pramanik, Ushasi Datta, Diaz-Fernandez, Paloma, Dillmann, Iris, Elekes, Zoltan, Enders, Joachim, Ershova, Olga, Estrade, A., Farinon, F., Fraile, Luis M., Freer, Martin, Freudenberger, M., Fynbo, Hans, Galaviz, Daniel, Geissel, Hans, Gernhäuser, Roman, Göbel, Kathrin, Golubev, Pavel, Diaz, Diego Gonzalez, Hagdahl, Julius, Heftrich, Tanja, Heil, Michael, Heine, Marcel, Heinz, Andreas, Henriques, Ana, Holl, Matthias, Ickert, G., Ignatov, Alexander, Jakobsson, Bo, Johansson, Hakan, Jonson, Björn, Kalantar-Nayestanaki, Nasser, Kanungo, Rituparna, Kelic-Heil, Aleksandra, Knöbel, Ronja, Kröll, Thorsten, Krücken, Reiner, Kurcewicz, J., Kurz, Nikolaus, Labiche, Marc, Langer, Christoph, Bleis, Tudi Le, Lemmon, Roy, Lepyoshkina, Olga, Lindberg, Simon, Machado, Jorge, Marganiec, Justyna, Caro, Magdalena Mostazo, Movsesyan, Alina, Najafi, Mohammad Ali, Nilsson, Thomas, Nociforo, Chiara, Panin, Valerii, Paschalis, Stefanos, Perea, Angel, Petri, Marina, Pietri, S., Plag, Ralf, Prochazka, A., Rahaman, Md. Anisur, Rastrepina, Ganna, Reifarth, Rene, Ribeiro, Guillermo, Ricciardi, M. Valentina, Rigollet, Catherine, Riisager, Karsten, Rossi, Dominic, Saez, Jose Sanchez del Rio, Savran, Deniz, Scheit, Heiko, Simon, Haik, Sorlin, Olivier, Stoica, V., Streicher, Branislav, Taylor, Jon, Tengblad, Olof, Terashima, Satoru, Thies, Ronja, Togano, Yasuhiro, Uberseder, Ethan, Van de Walle, J., Velho, Paulo, Volkov, Vasily, Wagner, Andreas, Wamers, Felix, Weick, Helmut, Weigand, Mario, Wheldon, Carl, Wilson, G., Wimmer, Christine, Winfield, J. S., Woods, Philip, Yakorev, Dmitry, Zhukov, Mikhail, Zilges, Andreas, and Zuber, Kai
Subjects: Nuclear Experiment
Abstract: Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on $^{20,21}$N are reported. Relativistic $^{20,21}$N ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ and $^{20}\mathrm{N}(\mathrm{n},\gamma)^{21}\mathrm{N}$ excitation functions and thermonuclear reaction rates have been determined. The $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ rate is up to a factor of 5 higher at $T<1$\,GK with respect to previous theoretical calculations, leading to a 10\,\% decrease in the predicted fluorine abundance.
Published: 2016
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3. Isomeric Lifetime Measurement in the Neutron-rich 189Ta

Author: Alhomaidhi Sultan, Sahin Elif, Werner Volker, Jolie Jan, Regan Patrick, Pietralla Norbert, Gerl Jürgen, Górska Magdalena, Benzoni Giovanna, Mistry Andrew K., Hubbard Nicolas, Aggez Guler, Albers Helena M., Arici Tugba, Armstrong Michael, Banerjee Akashrup, Das Biswarup, Davinson Thomas, Hall Oscar, Kojouharov Ivan, Koseoglou Pavlos, Mikolajczuk Michal, Podolyák Zsolt, Polettini Marta, Rudigier Matthias, Schaffner Henning, Wollersheim Hans-Jürgen, Yaneva Aleksandrina, Boutachkov Plamen, Dickel Timo, Haettner Emma, Heggen Henning, Hornung Christine, Knöbel Ronja, Kostyleva Daria, Kurz Nikolaus, Kuzminchuk Natalia, Mukha Ivan, Pietri Stephane, Plaß Wolfgang, Scheidenberger Christoph, Tanaka Yoshiki, Weick Helmut, Ahmed Usama, Aktas Özge, Algora Alejandro, Appleton Corrigan, Blazhev Andrey, Bruce Alison, Cederwall Bo, Chishti Muhammad M. R., Cortes Martha L., Crespi Fabio, Dobon Jose J., Doncel Maria, Ertoprak Aysegül, Esmaylzadeh Arwin, Expósito Marcos L., Fraile Luis M., García Jaime B., Gottardo Andrea, Ha Jeongsu, Jazrawi Shaheen, John Philipp R., Jones Calum, Karayonchev Vasil, Kern Ralph, Knafla Lukas, Kosir Gregor, Lozeva Radomira, Mengoni Daniele, Mertzimekis Theo J., Million Bénédicte, Morales Anabel, Murias Javier R., Orrigo Sonja E. A., Pellumaj Julgen, Pelonis Stefanos, Petrović Jana, Pigliapoco Sara, Quintana Begoña, Recchia Francesco, Rezynkina Kseniia, Sexton Lewis, Singh Nara, Söderström Pär-Anders, Sood Arshiya, Vasileiou Polytimos, Vesic Jelena, Wiederhold Johannes, zhang guangxin, Zidarova Radostina, and Zyriliou Aikaterini
Subjects: Physics, QC1-999
Abstract: Isomeric states of the neutron-rich isotope 18973Ta116 were populated via fragmentation of a primary beam of 208Pb ions at 1 GeV/u impinging on a 9Be target at GSI, Darmstadt, Germany. The isotopes of interest were separated, identified and delivered to the DESPEC setup. Two isomers were deduced in 189Ta116 and their lifetimes were measured based on the γ-ray time distributions.
Published: 2023
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4. Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

Author: European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Orrigo, S. E. A., Tain, José Luis, Mont-Geli, N., Tarifeño-Saldivia, A., Fraile, Luis M., Grieger, M., Agramunt, Jorge, Algora, Alejandro, Bemmerer, D., Calviño, F., Cortés, G., De Blas, A., Dillmann, I., Domínguez Bugarín, A., García, R, Nácher, Enrique, Tolosa-Delgado, A., European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Orrigo, S. E. A., Tain, José Luis, Mont-Geli, N., Tarifeño-Saldivia, A., Fraile, Luis M., Grieger, M., Agramunt, Jorge, Algora, Alejandro, Bemmerer, D., Calviño, F., Cortés, G., De Blas, A., Dillmann, I., Domínguez Bugarín, A., García, R, Nácher, Enrique, and Tolosa-Delgado, A.
Abstract: We report results on the long-term variation of the neutron counting rate at the Canfranc Underground Laboratory, of importance for several low-background experiments installed there, including rare-event searches. The measurement campaign was performed employing the High Efficiency Neutron Spectrometry Array (HENSA) mounted in Hall A and lasted 412 live days. The present study is the first long-term measurement of the neutron rate with sensitivity over a wide range of neutron energies (from thermal up to 0.1 GeV and beyond) performed in any underground laboratory so far. Data on the environmental variables inside the experimental hall (radon concentration, air temperature, air pressure and humidity) were also acquired during all the measurement campaign. We have investigated for the first time the evolution of the neutron rate for different energies of the neutrons and its correlation with the ambient variables.
Published: 2022

5. Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near

Author: Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.
Abstract: We measured 135 cross sections of residual nuclei produced in fragmentation reactions of C12, N14, and O13−16,20,22 projectiles impinging on a carbon target at kinetic energies of near 400A MeV, most of them for the first time, with the RB3/LAND setup at the GSI facility in Darmstadt (Germany). The use of this state-of-the-art experimental setup in combination with the inverse kinematics technique gave the full identification in atomic and mass numbers of fragmentation residues with a high precision. The cross sections of these residues were determined with uncertainties below 20% for most of the cases. These data are compared to other previous measurements with stable isotopes and are also used to benchmark different model calculations.
Published: 2022

6. 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

7. Importance of animal welfare in fattening lambs. Towards a welfare assessment model

Author: Lavín González, M. Paz [0000-0003-4311-6874], Ruiz Mantecón, Ángel [0000-0001-8499-4505], Bello, J. M., Fraile, Luis M., Lavín, Paz, Mantecón, Ángel R., Lavín González, M. Paz [0000-0003-4311-6874], Ruiz Mantecón, Ángel [0000-0001-8499-4505], Bello, J. M., Fraile, Luis M., Lavín, Paz, and Mantecón, Ángel R.
Published: 2021

8. Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Author: European Commission, Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Sparta, Roberta, Pietro, A. di, Figuera, P., Tengblad, Olof, Moro, A.M., Martel, Ismael, Fernández-García, J. P., Lei, J., Acosta, Luis, Borge, María José G., Bruni, G., Cederkäll, Joakim, Davinson, Thomas, Ovejas, J. D., Fraile, Luis M., Galaviz, D., Halkjaer Jensen, Jesper, Jonson, Björn, Cognata, M. La, Perea, Ángel, Sánchez-Benítez, A. M., Soic, Neven, Viñals, S., European Commission, Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Sparta, Roberta, Pietro, A. di, Figuera, P., Tengblad, Olof, Moro, A.M., Martel, Ismael, Fernández-García, J. P., Lei, J., Acosta, Luis, Borge, María José G., Bruni, G., Cederkäll, Joakim, Davinson, Thomas, Ovejas, J. D., Fraile, Luis M., Galaviz, D., Halkjaer Jensen, Jesper, Jonson, Björn, Cognata, M. La, Perea, Ángel, Sánchez-Benítez, A. M., Soic, Neven, and Viñals, S.
Abstract: Proton halo effects in the B+Zn reaction at an energy around 1.5 times the Coulomb barrier have been studied at HIE-ISOLDE CERN using, for the first time, the only existing postaccelerated B beam. This, together with the use of a high granularity and large solid angle detection system, allowed for a careful mapping of the elastic angular distribution, especially in the Coulomb-nuclear interference region. Contrary to what is observed for the one-neutron halo nucleus Be on the same target in a similar energy range, the analysis of the elastic scattering angular distribution shows only a modest suppression of the Coulomb-nuclear interference peak, with no remarkable enhancement of the total reaction cross-section. Inclusive angular and energy distributions of Be produced in direct reaction processes have also been measured. The comparison of these data with the results of theoretical calculations for the elastic and non-elastic breakup contributions indicate that both processes are important. Overall, the experimental data suggest a B collision dynamics at the barrier very different from the one of neutron halo nuclei, showing only modest effects of coupling to continuum. This behaviour can be interpreted as due to the presence of the additional Coulomb interactions halo-core and halo-target together with the presence of the centrifugal barrier felt by the valence proton of B.
Published: 2021

9. First -decay spectroscopy of and new -decay branches of

Author: National Science Centre (Poland), Universidad Complutense de Madrid, Agencia Estatal de Investigación (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), European Organization for Nuclear Research, Institute of Atomic Physics (Romania), European Commission, Academy of Finland, York University, Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, Luis M., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, J.G., Costache, C., Cubiss, J.G., Day Goodacre, T., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fynbo, H.O.U., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P.T., Grzywacz, R., Harkness-Brennan, L.J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D.S., Karanyonchev, V., Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez Rodríguez, María del Carmen, Nácher, Enrique, Olaizola, B., Page, R.D., Perea, Ángel, Pucknell, V., Rykaczewski, K.P., Régis, J.M., Schomacker, K., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, Olof, Udías, J.M., Vedia, V., Villa, A., Viñals, S., Warr, N., National Science Centre (Poland), Universidad Complutense de Madrid, Agencia Estatal de Investigación (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), European Organization for Nuclear Research, Institute of Atomic Physics (Romania), European Commission, Academy of Finland, York University, Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, Luis M., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, J.G., Costache, C., Cubiss, J.G., Day Goodacre, T., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fynbo, H.O.U., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P.T., Grzywacz, R., Harkness-Brennan, L.J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D.S., Karanyonchev, V., Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez Rodríguez, María del Carmen, Nácher, Enrique, Olaizola, B., Page, R.D., Perea, Ángel, Pucknell, V., Rykaczewski, K.P., Régis, J.M., Schomacker, K., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, Olof, Udías, J.M., Vedia, V., Villa, A., Viñals, S., and Warr, N.
Abstract: The decay of the neutron-rich and was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number above the shell. The -delayed -ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three -decay branches of were established, two of which were observed for the first time. Population of neutron-unbound states decaying via rays was identified in the two daughter nuclei of and , at excitation energies exceeding the neutron separation energy by 1 MeV. The -delayed one- and two-neutron emission branching ratios of were determined and compared with theoretical calculations. The -delayed one-neutron decay was observed to be dominant -decay branch of even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of . Transitions following the decay of are reported for the first time, including rays tentatively attributed to . In total, six new levels were identified in on the basis of the coincidences observed in the and decays. A transition that might be a candidate for deexciting the missing neutron single-particle state in was observed in both decays and its assignment is discussed. Experimental level schemes of and are compared with shell-model predictions. Using the fast timing technique, half-lives of the , and levels in were determined. From the lifetime of the state measured for the first time, an unexpectedly large transition strength was deduced, which is not reproduced by the shell-model calculations.
Published: 2021

10. The experiments to determine the electron capture and ß-decay of 8B into the highly excited states of 8Be.

Author: Ministerio de Economía y Competitividad (España), European Commission, Víñals, S., García Borge, María José, Tengblad, Olof, Nácher, Enrique, Benito, J., Figuera, P., Fraile, Luis M., Fynbo, H.O.U., Gad, A., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nilsson, T., Ovejas, J. D., Perea, Ángel, Riisager, K., Smain, S., Sotty, C., Ministerio de Economía y Competitividad (España), European Commission, Víñals, S., García Borge, María José, Tengblad, Olof, Nácher, Enrique, Benito, J., Figuera, P., Fraile, Luis M., Fynbo, H.O.U., Gad, A., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nilsson, T., Ovejas, J. D., Perea, Ángel, Riisager, K., Smain, S., and Sotty, C.
Abstract: The main goal of this work is to study the structure of the highest energy states in 8Be populated following the ß+-decay and the electron capture (EC) of 8B. With this aim, two experiments were performed at ISOLDE-CERN in 2017 and 2018. The first experiment had the aim to resolve the 2+ doublet at 16.6 and 16.9 MeV, in order to study their isospin mixing. The second experiment aimed to determine a value or give an experimental upper limit to the branching ratio of the exotic EC-p decay. In this paper, we present the experimental setups and we discuss the analysis and present the preliminary results obtained so far.
Published: 2020

11. Study of exotic decay of Cs isotope close to the proton drip line

Author: Science and Engineering Research Board (India), Department of Atomic Energy (India), European Commission, Ministerio de Economía y Competitividad (España), Council for Scientific and Industrial Research (India), Das, S., Datta, U., Chakraborty, S., Rahman, A., García Borge, María José, Tengblad, Olof, Andreyev, A.N., Becerril, A., Bhattacharya, P., Bhattacharyya, A., Cederkall, J., Witte, H. de, Fraile, Luis M., Gottberg, A., Greenlees, P.T., Harkness-Brennan, L.J., Huyse, M., Judson, D.S., Konki, J., Kurcewicz, J., Kowalska, M., Lazarus, I., Lică, R., Mandal, S., Madurga, Miguel, Marginean, N., Marginean, R., Mihai, C., Marroquín, I., Nácher, Enrique, Negret, A., Page, R.D., Pascu, S., Perea, Ángel, Pucknell, V., Rahkila, P., Rapisarda, E., Rotaru, F., Ray, J., Sotty, C.O., Van Duppen, P., Vedia, V., Warr, N., Stora, T., Wadsworth, R., Science and Engineering Research Board (India), Department of Atomic Energy (India), European Commission, Ministerio de Economía y Competitividad (España), Council for Scientific and Industrial Research (India), Das, S., Datta, U., Chakraborty, S., Rahman, A., García Borge, María José, Tengblad, Olof, Andreyev, A.N., Becerril, A., Bhattacharya, P., Bhattacharyya, A., Cederkall, J., Witte, H. de, Fraile, Luis M., Gottberg, A., Greenlees, P.T., Harkness-Brennan, L.J., Huyse, M., Judson, D.S., Konki, J., Kurcewicz, J., Kowalska, M., Lazarus, I., Lică, R., Mandal, S., Madurga, Miguel, Marginean, N., Marginean, R., Mihai, C., Marroquín, I., Nácher, Enrique, Negret, A., Page, R.D., Pascu, S., Perea, Ángel, Pucknell, V., Rahkila, P., Rapisarda, E., Rotaru, F., Ray, J., Sotty, C.O., Van Duppen, P., Vedia, V., Warr, N., Stora, T., and Wadsworth, R.
Abstract: The neutron-deficient 115Cs was produced at ISOLDE, CERN by spallation reaction using 1.4 GeV proton on LaC2 target. The exotic decay modes were studied by using a charged particle array (DSSD and pad detectors) and a ¿-detector array (four Clovers) at the ISOLDE decay station (IDS). In this report, results on observed ß-delayed particle emission from 115Cs, a nucleus close to proton drip line, is presented. By measuring the time distribution in the delayed proton spectrum, the half-life of the ground state of 115Cs was extracted. The obtained half-life is in agreement with previous reported value. For the first time, the p-unbound states of 115Xe, obtained by measuring beta-delayed protons from 115Cs is reported.
Published: 2020

12. Study of the scattering of 15C at energies around the Coulomb barrier.

Author: Consejo Superior de Investigaciones Científicas (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), European Commission, Universidad Nacional Autónoma de México, Ovejas, J. D., Knyazev, A., Martel, Ismael, Tengblad, Olof, García Borge, María José, Cederkall, J., Keeley, N., Rusek, K., García-Ramos, C., Pérez, T., Acosta, L.A., Arokiaraj, A.A., Babo, M., Cap, T., Ceylan, N., Angelis, G. de, Pietro, A. di, Fernández, J.P., Figuera, P., Fraile, Luis M., Fynbo, H., Galaviz, D., Jensen, J.H., Jonson, B., Kotak, R., Kurtukian-Nieto, T., Madurga, Miguel, Marquínez-Durán, G., Munch, M., Orduz, A.K., Honório, R., Pakou, A., Peralta, L., Perea, Ángel, Raabe, R., Renaud, M., Riisager, K., Sánchez-Benítez, A.M., Sánchez-Segovia, J., Sgouros, O., Soukeras, V., Teubig, P., Víñals, S., Wolinska-Cichocka, M., Wolski, R., Yang, J., Consejo Superior de Investigaciones Científicas (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), European Commission, Universidad Nacional Autónoma de México, Ovejas, J. D., Knyazev, A., Martel, Ismael, Tengblad, Olof, García Borge, María José, Cederkall, J., Keeley, N., Rusek, K., García-Ramos, C., Pérez, T., Acosta, L.A., Arokiaraj, A.A., Babo, M., Cap, T., Ceylan, N., Angelis, G. de, Pietro, A. di, Fernández, J.P., Figuera, P., Fraile, Luis M., Fynbo, H., Galaviz, D., Jensen, J.H., Jonson, B., Kotak, R., Kurtukian-Nieto, T., Madurga, Miguel, Marquínez-Durán, G., Munch, M., Orduz, A.K., Honório, R., Pakou, A., Peralta, L., Perea, Ángel, Raabe, R., Renaud, M., Riisager, K., Sánchez-Benítez, A.M., Sánchez-Segovia, J., Sgouros, O., Soukeras, V., Teubig, P., Víñals, S., Wolinska-Cichocka, M., Wolski, R., and Yang, J.
Abstract: The neutron rich carbon isotope 15C is the only known case of an almost "pure" 2s1/2 single-neutron halo ground state configuration. At collision energies around the Coulomb barrier the reaction dynamics is expected to be dominated by single neutron transfer and breakup. To investigate these effects, we have measured the scattering of 15C with a 208Pb target at 65 MeV at the HIE-ISOLDE facility in CERN (Geneva, Switzerland). The preliminary data demonstrates the presence of a strong long-range absorption pattern in the angular distribution of the elastic cross section. The results are discussed in the framework of Optical Model calculations.
Published: 2020

13. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Author: Royal Society (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), State of Hesse, Technische Universität Darmstadt, Helmholtz Association, European Young Investigator Awards, Swedish Research Council, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Xunta de Galicia, German Research Foundation, National Science Foundation (US), Syndikus, I., Petri, M., Macchiavelli, A.O., Paschalis, S., Bertulani, C.A., Aumann, T., Álvarez-Pol, H., Atar, L., Beceiro-Novo, S., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Brown, B.A., Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chakraborty, S., Chulkov, L.V., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Farinon, F., Fraile, Luis M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kröll, T., Kurz, N., Langer, C., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, Tengblad, Olof, Royal Society (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), State of Hesse, Technische Universität Darmstadt, Helmholtz Association, European Young Investigator Awards, Swedish Research Council, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Xunta de Galicia, German Research Foundation, National Science Foundation (US), Syndikus, I., Petri, M., Macchiavelli, A.O., Paschalis, S., Bertulani, C.A., Aumann, T., Álvarez-Pol, H., Atar, L., Beceiro-Novo, S., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Brown, B.A., Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chakraborty, S., Chulkov, L.V., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Farinon, F., Fraile, Luis M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kröll, T., Kurz, N., Langer, C., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, and Tengblad, Olof
Abstract: The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 2 state of C. The experimental findings support the notion of a moderate reduction of the proton 1p−1p spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline.
Published: 2020

14. The most accurate determination of the 8B half-life

Author: Ministerio de Economía y Competitividad (España), European Commission, Viñals, S., Nácher, Enrique, Tengblad, Olof, Benito, J., García Borge, María José, Figuera, P., Fraile, Luis M., Fynbo, H.O.U., Gad, A., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nilsson, T., Ovejas, J. D., Perea, Ángel, Riisager, K., Smain, S., Sotty, C., Ministerio de Economía y Competitividad (España), European Commission, Viñals, S., Nácher, Enrique, Tengblad, Olof, Benito, J., García Borge, María José, Figuera, P., Fraile, Luis M., Fynbo, H.O.U., Gad, A., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nilsson, T., Ovejas, J. D., Perea, Ángel, Riisager, K., Smain, S., and Sotty, C.
Abstract: Beta decay is a primary source of information of the structure of a nucleus. An accurate measurement of the half-life of a nucleus is essential for the proper determination of the reduced Gammow-Teller transition probability B(GT). In this work, we present an experiment using a compact set-up of Si-telescope detectors to measure the half-life of the B nucleus. Three independent measurements have been analysed, obtaining the values 771.9(17) ms, 773.9(18) ms, and 770.9(27) ms. The value of the half-life obtained as the weighted averaged with the previous published measures is 771.17(94) ms which is a factor 3.2 of improvement in the uncertainty of the half-life.
Published: 2020

15. Halo effects in the low-energy scattering of 15C with heavy targets

Author: European Organization for Nuclear Research, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Ovejas, J. D., Knyazev, A., Martel, Ismael, Tengblad, Olof, García Borge, María José, Cederkäll, J., Keeley, N., Rusek, K., García-Ramos, C., Acosta, L.A., Arokiaraj, A.A., Babo, M., Cap, T., Ceylan, N., Angelis, G. de, Pietro, A. di, Fernández, J.P., Figuera, P., Fraile, Luis M., Fynbo, H., Galaviz, D., Jensen, J.H., Jonson, B., Kotak, R., Kurtukian-Nieto, T., Madurga, Miguel, Marquínez-Durán, G., Munch, M., Orduz, A.K., Honório, R., Pakou, A., Pérez, T., Peralta, L., Perea, Ángel, Raabe, R., Renaud, M., Riisager, K., Sánchez-Benítez, A.M., Sánchez-Segovia, J., Sgouros, O., Soukeras, V., Teubig, P., Viñals, S., Wolinska-Cichocka, M., Wolski, R., Yang, J., European Organization for Nuclear Research, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Ovejas, J. D., Knyazev, A., Martel, Ismael, Tengblad, Olof, García Borge, María José, Cederkäll, J., Keeley, N., Rusek, K., García-Ramos, C., Acosta, L.A., Arokiaraj, A.A., Babo, M., Cap, T., Ceylan, N., Angelis, G. de, Pietro, A. di, Fernández, J.P., Figuera, P., Fraile, Luis M., Fynbo, H., Galaviz, D., Jensen, J.H., Jonson, B., Kotak, R., Kurtukian-Nieto, T., Madurga, Miguel, Marquínez-Durán, G., Munch, M., Orduz, A.K., Honório, R., Pakou, A., Pérez, T., Peralta, L., Perea, Ángel, Raabe, R., Renaud, M., Riisager, K., Sánchez-Benítez, A.M., Sánchez-Segovia, J., Sgouros, O., Soukeras, V., Teubig, P., Viñals, S., Wolinska-Cichocka, M., Wolski, R., and Yang, J.
Abstract: The neutron-rich carbon isotope C was postulated to be a halo nucleus (S = 1215 keV, S = 9395 keV) according to different high-energy experiments. If so, it would be the only halo nucleus exhibiting a "pure" s-wave structure of the ground state. At low collision energies, the effect of this halo structure should manifest as a strong absorption pattern in the angular distribution of the elastic cross section, with a total suppression of the nuclear rainbow due to the large neutron transfer and breakup probabilities, enhanced by the halo configuration. The IS619 experiment, carried out at the HIE-ISOLDE facility at CERN (Switzerland), is the first dynamical study of this nucleus at energies around the Coulomb barrier. It aims to probe the halo structure via the measurement of the elastic cross section on a high-Z Pb target. Preliminary results of the elastic cross section are discussed and compared to Optical Model calculations.
Published: 2020

16. Neutron flux and spectrum in the dresden felsenkeller underground facility studied by moderated he 3 counters

Author: Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Helmholtz Association, European Commission, Grieger, M., Hensel, T., Agramunt, Jorge, Bemmerer, D., Degering, D., Dillmann, I., Fraile, Luis M., Jordan, D., Köster, U., Marta, M., Müller, S.E., Szücs, T., Tain, José Luis, Zuber, K., Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Helmholtz Association, European Commission, Grieger, M., Hensel, T., Agramunt, Jorge, Bemmerer, D., Degering, D., Dillmann, I., Fraile, Luis M., Jordan, D., Köster, U., Marta, M., Müller, S.E., Szücs, T., Tain, José Luis, and Zuber, K.
Abstract: Ambient neutrons may cause significant background for underground experiments. Therefore, it is necessary to investigate their flux and energy spectrum in order to devise a proper shielding. Here, two sets of altogether ten moderated He3 neutron counters are used for a detailed study of the ambient neutron background in tunnel IV of the Felsenkeller facility, underground below 45 m of rock in Dresden/Germany. One of the moderators is lined with lead and thus sensitive to neutrons of energies higher than 10 MeV. For each He3 counter moderator assembly, the energy-dependent neutron sensitivity was calculated with the FLUKA code. The count rates of the ten detectors were then fitted with the MAXED and GRAVEL packages. As a result, both the neutron energy spectrum from 10-9 to 300 MeV and the flux integrated over the same energy range were determined experimentally. The data show that at a given depth, both the flux and the spectrum vary significantly depending on local conditions. Energy-integrated fluxes of (0.61±0.05), (1.96±0.15), and (4.6±0.4)×10-4 cm-2 s-1, respectively, are measured for three sites within Felsenkeller tunnel IV which have similar muon flux but different shielding wall configurations. The integrated neutron flux data and the obtained spectra for the three sites are matched reasonably well by FLUKA Monte Carlo calculations that are based on the known muon flux and composition of the measurement room walls.
Published: 2020

17. Revised rates for the stellar triple-α process from measurement of 12C nuclear resonances

Author: Fynbo, Hans O. U., Diget, Christian Aa., Bergmann, Uffe C., Borge, Maria J. G., Cederkall, Joakim, Dendooven, Peter, Fraile, Luis M., Franchoo, Serge, Fedosseev, Valentin N., Fulton, Brian R., Huang, Wenxue, Huikari, Jussi, Jeppesen, Henrik B., Jokinen, Ari S., Jones, Peter, Jonson, Bjorn, Koster, Ulli, Langanke, Karlheinz, Meister, Mikael, Nilsson, Thomas, Nyman, Goran, Prezado, Yolanda, Riisager, Karsten, Rinta-Antila, Sami, Tengblad, Olof, Turrion, Manuela, Wang, Youbao, Weissman, Leonid, Wilhelmsen, Katarina, and Aysto, Juha
Subjects: Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract: Author(s): Hans O. U. Fynbo (corresponding author) [1]; Christian Aa. Diget [1]; Uffe C. Bergmann [2]; Maria J. G. Borge [3]; Joakim CederkÃ¤ll [2]; Peter Dendooven [4]; Luis M. Fraile [...]
Published: 2005
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18. Study of multi-neutron emission in the β-decay of 11Li

Author: Delaunay, F., Achouri, N.L., Algora, Alejandro, Assié, M., Balibrea, J., Banerjee, K., Bhattacharya, C., García Borge, María José, Cano-Ott, D., Fernández-Domínguez, B., Fraile, Luis M., Gibelin, J., Lund, M.V., Madurga, Miguel, Marqués, F.M., Marroquín, I., Martínez, T., Mendoza, E., Orr, N.A., Pârlog, M., Pereira-López, X., Pestel, V., Riisager, K., Santos, C., Sénoville, M., Tengblad, Olof, and Vedia, V.
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Nuclear Experiment
Abstract: 4 pags., 1 fig. -- Open Access funded by Creative Commons Atribution Licence 4.0, The kinematics of two-neutron emission following the β-decay of Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors was used to reject cosmic-ray and γ-ray backgrounds by pulse-shape discrimination. Cross-talk events in which two detectors are fired by a single neutron were rejected using a filter tested on the β-1n emitter Li. A large cross-talk rejection rate is obtained (> 95%) over most of the energy range of interest. Application to Li data leads to a significant number of events interpreted as β-2n decay. A discrete neutron line at ≈ 2 MeV indicates sequential two-neutron emission, possibly from the unbound state at 10.6 MeV excitation energy in Be.
Published: 2019
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19. Elastic scattering of p-halo 8B beam close to the Coulomb barrier

Author: Sparta, Roberta, Figuera, P., Pietro, A. di, Tengblad, Olof, Fernández-García, J. P., Acosta-Sánchez, Luis Armando, Bjorn, Jonson, García Borge, María José, Bruni, Giovanni, Davison, Thomas, Ovejas, J. D., Fraile, Luis M., Galaviz, D., Halkjaer Jensen, Jesper, La Cognata, Marco, Martel, Ismael, Perea, Ángel, Sánchez-Benítez, Ángel, Soic, Neven, and Víñals, S.
Abstract: CERN Europe/Zurich, 5-6 diciembre 2019
Published: 2019

20. Electron Capture of 8B into highly excited states of 8Be

Author: García Borge, María José, Víñals, S., Gad, A., Figuera, P., Fraile, Luis M., Fynbo, H., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nácher, Enrique, Nilsson, T., Ovejas, J. D., Perea, Ángel, Refsgaard, J., Riisager, K., Sotty, C., Tengblad, Olof, García Borge, María José, Víñals, S., Gad, A., Figuera, P., Fraile, Luis M., Fynbo, H., Jensen, J., Jonson, B., Lică, R., Marroquín, I., Munch, M., Nácher, Enrique, Nilsson, T., Ovejas, J. D., Perea, Ángel, Refsgaard, J., Riisager, K., Sotty, C., and Tengblad, Olof
Published: 2019

21. Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range

Author: Federal Ministry of Education and Research (Germany), Technische Universität Darmstadt, Helmholtz International Center for FAIR, European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía, Industria y Competitividad (España), Swedish Research Council, National Science Foundation (US), Department of Energy (US), Fundação para a Ciência e a Tecnologia (Portugal), Holl, M., Panin, V., Álvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Benlliure, J., Bertulani, C.A., Boillos, J. M., Boretzky, K., Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chulkov, L., Cortina-Gil, D., Cravo, E., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Fraile, Luis M., Galaviz, D., Gernhäuser, R., Golubev, P., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kröll, T., Kurz, N., Langer, C., Le Bleis, T., Lindberg, S., Machado, J., Nácher, Enrique, Najafi, M.A., Nilsson, T., Nociforo, C., Paschalis, S., Petri, M., Reifarth, R., Ribeiro, Guillermo, Tengblad, Olof, Federal Ministry of Education and Research (Germany), Technische Universität Darmstadt, Helmholtz International Center for FAIR, European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía, Industria y Competitividad (España), Swedish Research Council, National Science Foundation (US), Department of Energy (US), Fundação para a Ciência e a Tecnologia (Portugal), Holl, M., Panin, V., Álvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Benlliure, J., Bertulani, C.A., Boillos, J. M., Boretzky, K., Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chulkov, L., Cortina-Gil, D., Cravo, E., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Fraile, Luis M., Galaviz, D., Gernhäuser, R., Golubev, P., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kröll, T., Kurz, N., Langer, C., Le Bleis, T., Lindberg, S., Machado, J., Nácher, Enrique, Najafi, M.A., Nilsson, T., Nociforo, C., Paschalis, S., Petri, M., Reifarth, R., Ribeiro, Guillermo, and Tengblad, Olof
Abstract: The quasi-free scattering reactions C(p,2p) and C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the RB-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the C(p,2p) and C(p,pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei.
Published: 2019

22. First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate

Author: Kirsebom, O.S., Tengblad, Olof, Lică, R., Munch, M., Riisager, K., Fynbo, H.O.U., García Borge, María José, Madurga, Miguel, Marroquín, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Díaz Fernández, P., Doherty, D.T., Van Duppen, P., Fraile, Luis M., Gallardo, M. C., Greenlees, P.T., Harkness-Brennan, L.J., Hubbard, N., Huyse, M., Jensen. J. H., Johansson, H., Jonson, B., Judson, D.S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, Ángel, Mihai, C., Negret, A., Page, R. D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sørensen, H. B., Törnqvist, H., Vedia, V., Warr, N., Witte, H. de, Helsinki Institute of Physics, European Commission, Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Science and Technology Facilities Council (UK), European Research Council, Federal Ministry of Education and Research (Germany), Royal Society of Arts and Sciences in Gothenburg, Villum Fonden, Research Foundation - Flanders, and SCOAP
Subjects: ENERGY-LEVELS, LIGHT-NUCLEI, LEVEL, BRANCHING RATIO, O-16, CROSS-SECTION, MATRIX, 114 Physical sciences, STATE
Abstract: 6 pags., 4 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning., This work has been supported by the European Research Council under the ERC starting Grant Long Beamtime Experiments in Nuclear Astrophysics, No. 307447, the Horizon 2020 Research and Innovation Programme under Grant Agreement No. 654002, the Spanish Ministry of Economy and Competitiveness through Projects No. FPA2015-64969- P, FPA2015-65035-P, and FPA2017-87568-P, the Romanian Institutul de Fizica Atomica Grant CERN/ISOLDE, the United Kingdom Science and Technology Facilities Council, the Fonds voor Wetenschappelijk Onderzoek- Vlaanderen (Belgium) and GOA/2010/010 (Bijzonder OnderzoeksFonds KU Leuven), the German Federal Ministry of Education and Research under Contract No. 05P15PKCIA (ISOLDE) and Verbundprojekt 05P2015. B. J. acknowledges support from The Royal Society of Arts and Sciences in Gothenburg and OSK from the Villum Foundation through Project No. 10117.
Published: 2018

23. Searching for ß-delayed protons from 11 Be

Author: Sokolowska, Natalia Anna, García Borge, María José, Ciemny, Aleksandra, Dominik, W., Fijalkowska, A., Fraile, Luis M., Giska, Amanda, Janas, Z., Janiak, U., Kaminski, G., Korgul, A. B., Kubiela, Adam, Mazzocchi, Ch., Miernik, K., Pfutzner, M. L., Pomorski, Marcin, Ovejas, J. D., Sokolowska, Natalia Anna, García Borge, María José, Ciemny, Aleksandra, Dominik, W., Fijalkowska, A., Fraile, Luis M., Giska, Amanda, Janas, Z., Janiak, U., Kaminski, G., Korgul, A. B., Kubiela, Adam, Mazzocchi, Ch., Miernik, K., Pfutzner, M. L., Pomorski, Marcin, and Ovejas, J. D.
Published: 2018

24. Strong Neutron Pairing in core+4n Nuclei

Author: Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), Revel, A., Marqués, F. M., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Vandebrouck, M., Wamers, F., Álvarez-Pol, H., Atar, L., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Casarejos, E., Catford, W.N., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Díaz Fernández, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nácher, Enrique, Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Röder, M., Rossi, D., Savran, D., Scheit, H., Simon, H., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), Revel, A., Marqués, F. M., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Vandebrouck, M., Wamers, F., Álvarez-Pol, H., Atar, L., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Casarejos, E., Catford, W.N., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Díaz Fernández, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nácher, Enrique, Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Röder, M., Rossi, D., Savran, D., Scheit, H., Simon, H., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., and Togano, Y.
Abstract: The emission of neutron pairs from the neutron-rich N = 12 isotones C-18 and O-20 has been studied by high-energy nucleon knockout from N-19 and O-21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N-19(-1p)18C*-> C-16 + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a C-14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O-21(-1n)O-20*-> O-18 + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O-16 core and reduces the number of pairs.
Published: 2018

25. Investigation of low-lying states in 133sn populated in the - Decay of 133in using isomer-selective laser ionization

Author: National Science Centre (Poland), Fundação para a Ciência e a Tecnologia (Portugal), SCOAP, Ministerio de Economía y Competitividad (España), Piersa, M., Korgul, A., Fraile, Luis M., Benito, J., Adamska, E., Álvarez, R., Barzakh, A.E., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Day Goodacre, T., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, A., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lică, R., Madurga, Miguel, Marroquín, I., Marsh, B., Martínez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Régis, J.-M., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udías, J. M., Vedia, V., Villa, A., Walters, W. B., National Science Centre (Poland), Fundação para a Ciência e a Tecnologia (Portugal), SCOAP, Ministerio de Economía y Competitividad (España), Piersa, M., Korgul, A., Fraile, Luis M., Benito, J., Adamska, E., Álvarez, R., Barzakh, A.E., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Day Goodacre, T., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, A., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lică, R., Madurga, Miguel, Marroquín, I., Marsh, B., Martínez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Régis, J.-M., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udías, J. M., Vedia, V., Villa, A., and Walters, W. B.
Abstract: Excited states in the neutron-rich isotope 133Sn were studied via the ß decay of 133In. Isomer selective ionization using the ISOLDE RILIS enabled the ß decays of 133Ings (I¿ = 9=2+) and 133mIn (II¿ = 1=2-) to be studied independently for the first time. A description of the experimental setup at the ISOLDE Decay Station is presented together with preliminary results from the experiment.
Published: 2018

26. First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate.

Author: European Commission, Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Science and Technology Facilities Council (UK), European Research Council, Federal Ministry of Education and Research (Germany), Royal Society of Arts and Sciences in Gothenburg, Villum Fonden, Research Foundation - Flanders, SCOAP, Kirsebom, O.S., Tengblad, Olof, Lică, R., Munch, M., Riisager, K., Fynbo, H.O.U., García Borge, María José, Madurga, Miguel, Marroquín, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Díaz Fernández, P., Doherty, D.T., Van Duppen, P., Fraile, Luis M., Gallardo, M. C., Greenlees, P.T., Harkness-Brennan, L.J., Hubbard, N., Huyse, M., Jensen. J. H., Johansson, H., Jonson, B., Judson, D.S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, Ángel, Mihai, C., Negret, A., Page, R.D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sørensen, H. B., Törnqvist, H., Vedia, V., Warr, N., Witte, H. de, European Commission, Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Science and Technology Facilities Council (UK), European Research Council, Federal Ministry of Education and Research (Germany), Royal Society of Arts and Sciences in Gothenburg, Villum Fonden, Research Foundation - Flanders, SCOAP, Kirsebom, O.S., Tengblad, Olof, Lică, R., Munch, M., Riisager, K., Fynbo, H.O.U., García Borge, María José, Madurga, Miguel, Marroquín, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Díaz Fernández, P., Doherty, D.T., Van Duppen, P., Fraile, Luis M., Gallardo, M. C., Greenlees, P.T., Harkness-Brennan, L.J., Hubbard, N., Huyse, M., Jensen. J. H., Johansson, H., Jonson, B., Judson, D.S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, Ángel, Mihai, C., Negret, A., Page, R.D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sørensen, H. B., Törnqvist, H., Vedia, V., Warr, N., and Witte, H. de
Abstract: The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.
Published: 2018

27. Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength.

Author: Helmholtz Centre for Heavy Ion Research, Department of Energy (US), National Science Foundation (US), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), University of Leicester, Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Díaz Fernández, P., Holl, M., Najafi, M.A., Panin, V., Álvarez-Pol, H., Aumann, T., Avdeichikov, V., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nácher, Enrique, Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Helmholtz Centre for Heavy Ion Research, Department of Energy (US), National Science Foundation (US), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), University of Leicester, Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Díaz Fernández, P., Holl, M., Najafi, M.A., Panin, V., Álvarez-Pol, H., Aumann, T., Avdeichikov, V., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nácher, Enrique, Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., and Winfield, J. S.
Abstract: Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the (RB)-B-3/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type O-A(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.
Published: 2018

28. Evolution of deformation in neutron-rich Ba isotopes up to A=150.

Author: Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., Marginean, R., Mihai, C., Mihai, R.E., Negret, A., Orduz, A., Patyk, Z., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Regis, J. M., Robledo, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., Tengblad, Olof, Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., Marginean, R., Mihai, C., Mihai, R.E., Negret, A., Orduz, A., Patyk, Z., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Regis, J. M., Robledo, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., and Tengblad, Olof
Abstract: The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character.
Published: 2018

29. 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

30. Experimental study of 100Tc β decay with total absorption γ-ray spectroscopy

Author: Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Jordan, D., Montaner-Pizá, A., Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Fraile, Luis M., Martínez, T., Nácher, Enrique, Monserrate, Manuel, Vedia, V., Zakari-Issoufou, A. A., info:eu-repo/grantAgreement/EC/FP7/605203, Ministerio de Educación, Cultura y Deporte (España), European Commission, Consejo Superior de Investigaciones Científicas (España), Academy of Finland, Science and Technology Facilities Council (UK), Universidad de Valencia, and Ministerio de Economía y Competitividad (España)
Abstract: V. Guadilla et al. -- 10 pags., 10 figs., 2 tabs., The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100., This work has been supported by the Spanish Ministerio de Economía y Competitividad under Grants No. FPA2011-24553, No. AIC-A-2011-0696, No. FPA2014-52823-C2-1-P, No. FPA2015-65035-P, and No. FPI/BES-2014-068222, and by the program Severo Ochoa (SEV-2014-0398), by the Spanish Ministerio de Educación, Cultura y Deporte under the FPU12/01527 Grant, by the European Commission under the FP7/EURATOM contract 605203 and the FP7/ENSAR contract 262010, and by the Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE. This work has been partially supported by the Academy of Finland under the Finnish Centre of Excellence Programme 2012-2017 (Project No. 213503, Nuclear and Accelerator Based Programme at JYFL). W.G. was supported by the UK Science and Technology Facilities Council (STFC) Grant ST/F012012/1 and by the Atracció de talent VLC-CAMPUS Programme of the University of Valencia.
Published: 2017

31. Decay of the N=126, 213Fr nucleus

Author: Pragati, Algora, Alejandro, Rubio, Berta, Agramunt, Jorge, Fraile, Luis M., Estévez Aguado, María Esther, Briz, José Antonio, Gelletly, W., Maira-Vidal, A., Ministry of Human Resource Development (India), European Commission, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), CSIC-UV - Instituto de Física Corpuscular (IFIC), and SCOAP
Abstract: Pragati et al. ; 8 págs.; 9 figs.; 2 tabs. ; Open Access funded by Creative Commons Atribution Licence 3.0, γ rays following the EC/β+ and α decay of the N = 126, Fr213 nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of γ-ray and conversion-electron spectroscopy. These γ rays establish several hitherto unknown excited states in Rn213. Also, five new α-decay branches from the Fr213 ground state have been discovered. Shell model calculations have been performed to understand the newly observed states in Rn213. Published by the American Physical Society, Financial support from the European Union Sixth Framework through RII3-EURONS Contract No. 506065, the UK STFC, the Spanish MINECO through Grants No. FPA2005-03993, No. FPA2013-41267-P, No. FPA2014-52823-C2-1-P, and No. FPA2015-65035-P, and the Centro de Excelencia Severo Ochoa del IFIC SEV-2014-0398 Projects is gratefully acknowledged. Pragati acknowledges financial support from the Ministry of Human Resource Development, Government of India.
Published: 2016

32. Study of bound states in 10Be by one neutron removal reactions of 11Be

Author: Research Foundation - Flanders, European Commission, Science and Technology Facilities Council (UK), Maier-Leibnitz-Laboratorium, Ministerio de Economía y Competitividad (España), Federal Ministry of Education and Research (Germany), Belgian Science Policy Office, SCOAP, Johansen, J.G., Bildstein, V., García Borge, María José, Cubero, M., Fraile, Luis M., Pesudo, V., Tengblad, Olof, Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., Witte, H. D., Research Foundation - Flanders, European Commission, Science and Technology Facilities Council (UK), Maier-Leibnitz-Laboratorium, Ministerio de Economía y Competitividad (España), Federal Ministry of Education and Research (Germany), Belgian Science Policy Office, SCOAP, Johansen, J.G., Bildstein, V., García Borge, María José, Cubero, M., Fraile, Luis M., Pesudo, V., Tengblad, Olof, Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., and Witte, H. D.
Abstract: The bound states of Be have been studied by removing single neutrons from Be nuclei. A 2.8 MeV u beam of Be was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in Be were identified by gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in Be. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the state is observed, which which may indicate the presence of multi-step processes at our beam energy.
Published: 2017

33. Search for shape-coexisting 0+ states in Ni 66 from lifetime measurements

Author: National Science Foundation (US), Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), European Commission, Ministerio de Economía y Competitividad (España), Universidad Complutense de Madrid, Olaizola, B., Fraile, Luis M., Mach, H., Poves, Alfredo, Briz, José Antonio, Cal-González, J., Picado, E., Udías, J. M., National Science Foundation (US), Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), European Commission, Ministerio de Economía y Competitividad (España), Universidad Complutense de Madrid, Olaizola, B., Fraile, Luis M., Mach, H., Poves, Alfredo, Briz, José Antonio, Cal-González, J., Picado, E., and Udías, J. M.
Abstract: The lifetime of the 03+ state in Ni66, two neutrons below the N=40 subshell gap, has been measured. The transition B(E2;03+→21+) is one of the most hindered E2 transitions in the Ni isotopic chain and it implies that, unlike Ni68, there is a spherical structure at low excitation energy. We have performed extensive shell-model calculations that correctly predict this result, obtaining a spherical 0+ state at the correct energy and with an extremely low B(E2;03+→21+) value.
Published: 2017

34. Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26

Author: National Research Council of Canada, Natural Sciences and Engineering Research Council of Canada, National Science Foundation (US), European Research Council, European Commission, German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), Ohio Supercomputer Center, Michigan State University, Helmholtz International Center for FAIR, State of Hesse, Department of Energy (US), Vandebrouck, M., Lepailleur, A., Álvarez-Pol, H., Benlliure, J., Boillos, J. M., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, Tengblad, Olof, Zuber, K., National Research Council of Canada, Natural Sciences and Engineering Research Council of Canada, National Science Foundation (US), European Research Council, European Commission, German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), Ohio Supercomputer Center, Michigan State University, Helmholtz International Center for FAIR, State of Hesse, Department of Energy (US), Vandebrouck, M., Lepailleur, A., Álvarez-Pol, H., Benlliure, J., Boillos, J. M., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, Tengblad, Olof, and Zuber, K.
Abstract: Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the i
Published: 2017

35. Strong gamma-ray emission from neutron unbound states populated in ß-decay: Impact on (n,gamma) cross-section estimates

Author: Universidad de Valencia, Academy of Finland, Engineering and Physical Sciences Research Council (UK), National Measurement Office (UK), European Commission, Department of Energy (US), SCOAP, Ministerio de Economía y Competitividad (España), Taín, José Luis, Guadilla Gómez, Víctor, Valencia, Ebhelixes, Algora, Alejandro, Agramunt, Jorge, Briz, José Antonio, Caballero-Folch, R., Cano Ott, Daniel, Estévez, E., Fraile, Luis M., García, A.R., Gómez-Hornillos, B., Gorlychev, V., Jordán, M. D., Martínez, T., Mendoza, E., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Vedia, V., Wilson, J. N., Universidad de Valencia, Academy of Finland, Engineering and Physical Sciences Research Council (UK), National Measurement Office (UK), European Commission, Department of Energy (US), SCOAP, Ministerio de Economía y Competitividad (España), Taín, José Luis, Guadilla Gómez, Víctor, Valencia, Ebhelixes, Algora, Alejandro, Agramunt, Jorge, Briz, José Antonio, Caballero-Folch, R., Cano Ott, Daniel, Estévez, E., Fraile, Luis M., García, A.R., Gómez-Hornillos, B., Gorlychev, V., Jordán, M. D., Martínez, T., Mendoza, E., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Vedia, V., and Wilson, J. N.
Abstract: Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of ¿ emission from neutron-unbound states populated in the ß-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission one can deduce information on the (n,¿) cross section for unstable neutron-rich nuclei of interest in r process abundance calculations. A surprisingly large ¿ branching was observed for a number of isotopes. The results are compared with Hauser-Feshbach calculations and discussed.
Published: 2017

36. TAGS measurements of 100Nb ground and isomeric states and 140Cs for neutrino physics with the new DTAS detector

Author: European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Briz, José Antonio, Fraile, Luis M., Jordan, D., Martínez, T., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Vedia, V., Zakari-Issoufou, A. A., European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Briz, José Antonio, Fraile, Luis M., Jordan, D., Martínez, T., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Vedia, V., and Zakari-Issoufou, A. A.
Abstract: In this work we report on total absorption ¿-ray spectroscopy measurements of the ß decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the ß decay of 100Nb,100mNb and 140Cs are presented.
Published: 2017

37. Coulomb dissociation of N-20,N-21

Author: Roeder, Marko, Adachi, Tatsuya, Aksyutina, Yulia, Alcantara, Juan, Altstadt, Sebastian, Alvarez-Pol, Hector, Ashwood, Nicholas, Atar, Leyla, Aumann, Thomas, Avdeichikov, Vladimir, Barr, M., Beceiro, Saul, Bemmerer, Daniel, Benlliure, Jose, Bertulani, Carlos, Boretzky, Konstanze, Borge, Maria J. G., Burgunder, G., Caamano, Manuel, Caesar, Christoph, Casarejos, Enrique, Catford, Wilton, Cederkall, Joakim, Chakraborty, S., Chartier, Marielle, Chulkov, Leonid, Cortina-Gil, Dolores, Crespo, Raquel, Pramanik, Ushasi Datta, Diaz-Fernandez, Paloma, Dillmann, Iris, Elekes, Zoltan, Enders, Joachim, Ershova, Olga, Estrade, A., Farinon, F., Fraile, Luis M., Freer, Martin, Freudenberger, M., Fynbo, Hans, Galaviz, Daniel, Geissel, Hans, Gernhaeuser, Roman, Goebel, Kathrin, Kalantar-Nayestanaki, Nasser, Najafi, Mohammad Ali, Rigollet, Catherine, Stoica, V., Streicher, Branislav, Van de Walle, J., and Research unit Nuclear & Hadron Physics
Subjects: LIGHT, REFERENCES, NUCLEI, Astrophysics::High Energy Astrophysical Phenomena, ELEMENTS, R-PROCESS NUCLEOSYNTHESIS, DETECTOR, RELATIVISTIC HEAVY-IONS, STARS, GRAPHS, TABLES
Abstract: Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N-20,N-21 are reported. Relativistic N-20,N-21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N-19(n,gamma)N-20 and N-20(n,gamma)N-21 excitation functions and thermonuclear reaction rates have been determined. The N-19(n,gamma)N-20 rate is up to a factor of 5 higher at T
Published: 2016

38. Coulomb dissociation of N 20,21

Author: Röder, M., Adachi, T., Aksyutina, Y., Alcántara, J., Altstadt, S., Álvarez-Pol, H., Beceiro, S., Benlliure, J., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Díaz-Fernández, P., Fraile, Luis M., Mostazo Caro, M., Ribeiro, Guillermo, Sánchez del Río, José, Tengblad, Olof, Helmholtz Centre for Heavy Ion Research, Swedish Research Council, Ministerio de Economía y Competitividad (España), Nuclear Astrophysics Virtual Institute (Germany), Fundação para a Ciência e a Tecnologia (Portugal), Science and Technology Facilities Council (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), and Helmholtz International Center for FAIR
Abstract: Marko Röder et al. ; 11 págs.; 10 figs.; 2 tabs., Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N20,21 are reported. Relativistic N20,21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N19(n,γ)N20 and N20(n,γ)N21 excitation functions and thermonuclear reaction rates have been determined. The N19(n,γ)N20 rate is up to a factor of 5 higher at T, This work was supported in part by GSI (F&E, DRZUBE), Bundesministerium f¨ur Bildung und Forschung (BMBF) (06DR134I, 05P09CRFN5, 05P12RDFN8, and 05P15RDFN1), the Hemholtz Association Germany through the Nuclear Astrophysics Virtual Institute (NAVI, Grant No. VH-VI-417), the Helmholtz Association Detector Technology and Systems Platform, the Spanish Research funding agency under projects FPA2012-32443, FPA2013- 41267-P, and FPA2013-47831-C2-1-P, the Swedish Research Council, HIC for FAIR and the TUDarmstadt-GSI cooperation contract, the Portuguese FCTproject PTDC/FIS/103902/2008, UK STFC under grants ST/E500651/1 and ST/F011989/1, US NSF Grant No. 1415656, and US DOE Grant No. DE-FG02- 08ER41533
Published: 2016

39. Fast-timing study of the l-forbidden 1/2+→3/2+ M1 transition in Sn129

Author: Lică, R., Mach, H., Fraile, Luis M., García Borge, María José, Marroquín, I., Morales, Ana Isabel, Nácher, Enrique, Perea, Ángel, Rotaru, F., Tengblad, Olof, Vidal, M., Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Ministerio de Economía y Competitividad (España), Research Foundation - Flanders, Belgian Science Policy Office, Universidad Complutense de Madrid, European Organization for Nuclear Research, Science and Technology Facilities Council (UK), European Commission, SCOAP, and Ministero dell'Istruzione, dell'Università e della Ricerca
Abstract: R. Lică et al. ; 7 págs.; 5 figs.; 3 tabs. ; Open Access funded by Creative Commons Atribution Licence 3.0, The levels in Sn129 populated from the β- decay of In129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 12+ state and the 32+ ground state in Sn129 are expected to have configurations dominated by the neutron s12 (l=0) and d32 (l=2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow l-forbidden M1 transition. Using fast-timing spectroscopy we have measured the half-life of the 12+ 315.3-keV state, T12= 19(10) ps, which corresponds to a moderately fast M1 transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and g factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured T12 value by the renormalization of the M1 effective operator for neutron holes., This work was partially supported by the Spanish MINECO through Projects No. FPA2012-32443, No. FPA2013-41267-P, and CPAN Consolider (Project No. CSD-2007-00042), and by Romanian IFA Grant CERN/ISOLDE. It was also partly funded by the NuPNET network FATIMA (PRI-PIMNUP-2011-1338), by FWO-Vlaanderen (Belgium), by GOA/2010/010 (BOF KU Leuven), and by the Interuniversity Attraction Poles Programme initiated by the Belgian Science PolicyOffice (BriX network P7/12). Support from Grupo de Física Nuclear (GFN-UCM), Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) Grant No. 2001024324 01302, German BMBF under Contracts No. 05P12PKFNE and No. 05P15PKCIA, the U.K. Science and Technology Facilities Council, and the European Union Seventh Framework through ENSAR (Contract No. 262010) is also acknowledged. Fasttiming electronics were provided by the Fast Timing Collaboration, the ISOLDE Decay Station collaboration, and MASTICON.
Published: 2016

40. Studies of unbound states in isotopes at the N=8 shell closure

Author: Borge, Maria J G, Fraile, Luis M, Fynbo, Hans O U, Gernhäuser, Roman, Heinz, Andreas, Howard, Alan, Johansen, Jacob G, Johansson, Haakan T, Jonson, Björn, Kirsebom, Oliver S, Kröll, Thorsten, Lindberg, Simon, Mücher, Dennis, Nilsson, Thomas, Paschalis, Stefanos, Petri, Marina, Raabe, Riccardo, Riisager, Karsten, Tengblad, Olof, Thies, Ronja, and Van Duppen, Piet
Subjects: Detectors and Experimental Techniques
Published: 2015

41. Shape study of the N = Z nucleus Kr-72 via beta decay

Author: Briz, José Antonio, Nácher, Enrique, García Borge, María José, Algora, Alejandro, Rubio, Berta, Dessagne, Ph., Maira-Vidal, A., Cano Ott, Daniel, Courtin, S., Escrig, Diego, Fraile, Luis M., Gelletly, W., Jungclaus, Andrea, Le Scornet, G., Maréchal, F., Miehé, Ch., Poirier, E., Poves, Alfredo, Sarriguren, Pedro, Taín, José Luis, Tengblad, Olof, European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), and SCOAP
Abstract: 10 pags.; 11 figs.; 2 tabs.; PACS number(s): 23.40.Hc, 29.30.Kv, 27.50.+e, 21.10.Pc; Open Access funded by Creative Commons Atribution Licence 3.0, The beta decay of the N = Z nucleus Kr-72 has been studied with the total absorption spectroscopy technique at ISOLDE (CERN). A total B(GT) = 0.79(4)g(A)(2)/4 pi has been found up to an excitation energy of 2.7 MeV. The B(GT) distribution obtained is compared with predictions from state-of-the-art theoretical calculations to learn about the ground state deformation of Kr-72. Although a dominant oblate deformation is suggested by direct comparison with quasiparticle random phase approximation (QRPA) calculations, beyond-mean-field and shell-model calculations favor a large oblate-prolate mixing in the ground state. Published by the American Physical Society, J.A.B. acknowledges the predoctoral grant BES-2008-009412 associated with the research project FPA2007-62170 funded by Ministerio de Ciencia e Innovacion (Spain). This work has ´ been partly supported by the Spanish Ministerio de Economía y Competitividad (MINECO) through projects FPA2012- 32443, FPA2011-24553, FPA2011-29854-C04-01, FPA2013- 41267-P, FPA2014-52823-C2-1-P and FIS2011-23565, by STFC-UK (Grant No. ST/F012012/1) and by the European Union by means of the European Commission within its Seventh Framework Programme (FP7) via ENSAR (Contract No. 262010)
Published: 2015

42. Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Author: Federal Ministry of Education and Research (Germany), Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Science and Technology Facilities Council (UK), Department of Energy (US), Ministerio de Economía y Competitividad (España), Swedish Research Council, Helmholtz Centre for Heavy Ion Research, National Science Foundation (US), Thies, R., Alcantara-Núñes, J., Álvarez-Pol, H., Benlliure, J., García Borge, María José, Casarejos, E., Fraile, Luis M., Perea, Ángel, Ribeiro, Guillermo, Sánchez del Río, José, Tengblad, Olof, Federal Ministry of Education and Research (Germany), Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Science and Technology Facilities Council (UK), Department of Energy (US), Ministerio de Economía y Competitividad (España), Swedish Research Council, Helmholtz Centre for Heavy Ion Research, National Science Foundation (US), Thies, R., Alcantara-Núñes, J., Álvarez-Pol, H., Benlliure, J., García Borge, María José, Casarejos, E., Fraile, Luis M., Perea, Ángel, Ribeiro, Guillermo, Sánchez del Río, José, and Tengblad, Olof
Abstract: Background: Models describing nuclear fragmentation and fragmentation fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool for reaching the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes. Method: We have measured projectile fragments from C10,12-18 and B10-15 isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent data set. We compare our data to model calculations. Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic C10,12-18 and B10-15 isotopes impinging on a carbon target. Comparing model calculations to the data, we find that the epax code is not able to describe the data satisfactorily. Using abrabla07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease abrabla07 describes the data surprisingly well. Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data has allowed a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study. ©2016 American Physical Society
Published: 2016

43. Multi-particle Emission from ar-31 at ISOLDE

Author: Ministerio de Economía y Competitividad (España), Marroquín, I., García Borge, María José, Fraile, Luis M., Garzón-Camacho, Alejandro, Madurga, Miguel, Nácher, Enrique, Perea, Ángel, Tengblad, Olof, Turturica, A. E., Vedia, M. V., Ministerio de Economía y Competitividad (España), Marroquín, I., García Borge, María José, Fraile, Luis M., Garzón-Camacho, Alejandro, Madurga, Miguel, Nácher, Enrique, Perea, Ángel, Tengblad, Olof, Turturica, A. E., and Vedia, M. V.
Abstract: A multi-particle decay experiment was successfully performed at the ISOLDE Decay Station. In this new permanent station, devoted to -decay studies, the novel MAGISOL Si-Plugin Chamber was installed to study the exotic decay modes of the proton drip-line nucleus 31Ar. The motivation was to search for 3p and 3p channels, as well as to provide information on resonances in 30S and 29P relevant for the astrophysical rp-process. Description of the experimental set-up and preliminary results are presented.
Published: 2016

44. Nuclear astrophysics with radioactive ions at FAIR

Author: Helmholtz International Center for FAIR, German Research Foundation, Helmholtz Association, SCOAP, Reifarthl, R., Álvarez-Pol, H., Álvarez-Rodríguez, Raquel, Beceiro, S., Benlliure, J., Berjillos, R., Briz, José Antonio, Caamano, M., Cortina-Gil, D., Casarejos, E., Díaz Fernández, P., Dueñas, J., Fernandez-Dominguez, B., Fraile, Luis M., García Borge, María José, Galaviz, D., Machado, J., Martinez Perez, M., Moreno, Óscar, Nácher, Enrique, Parkar, V., Paradela, Cristina, Perea, Ángel, Pereira, J., Ribeiro, Guillermo, Rodriguez Frutos, T., Vignote, Javier R., Sanchez del Río Saez, J., Sánchez Rosado, J., Sarriguren, Pedro, Silva, J., Tengblad, Olof, Volknandt, M., Helmholtz International Center for FAIR, German Research Foundation, Helmholtz Association, SCOAP, Reifarthl, R., Álvarez-Pol, H., Álvarez-Rodríguez, Raquel, Beceiro, S., Benlliure, J., Berjillos, R., Briz, José Antonio, Caamano, M., Cortina-Gil, D., Casarejos, E., Díaz Fernández, P., Dueñas, J., Fernandez-Dominguez, B., Fraile, Luis M., García Borge, María José, Galaviz, D., Machado, J., Martinez Perez, M., Moreno, Óscar, Nácher, Enrique, Parkar, V., Paradela, Cristina, Perea, Ángel, Pereira, J., Ribeiro, Guillermo, Rodriguez Frutos, T., Vignote, Javier R., Sanchez del Río Saez, J., Sánchez Rosado, J., Sarriguren, Pedro, Silva, J., Tengblad, Olof, and Volknandt, M.
Abstract: The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process ow and r-process -decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will oer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes.
Published: 2016

45. Experimental study of the O-15(2p, gamma) Ne-17 cross section by Coulomb Dissociation for the rp process

Author: SCOAP, Helmholtz International Center for FAIR, European Commission, Federal Ministry of Education and Research (Germany), Marganiec, J., Álvarez-Pol, H., Beceiro, S., García Borge, María José, Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Perea, Ángel, Rodríguez-Tajes, C., Tengblad, Olof, Zhukov, M., SCOAP, Helmholtz International Center for FAIR, European Commission, Federal Ministry of Education and Research (Germany), Marganiec, J., Álvarez-Pol, H., Beceiro, S., García Borge, María José, Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Perea, Ángel, Rodríguez-Tajes, C., Tengblad, Olof, and Zhukov, M.
Abstract: The time-reversed reaction 15O(2p, !)17Ne has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of 20Ne in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-R3B experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary di↵erential and integral Coulomb Dissociation cross sections (>Coul) have been calculated, which provide a photoabsorption (>photo) and a radiative capture cross section (>cap). Additionally, important information about the nuclear structure of the 17Ne nucleus will be obtained. The analysis is in progress.
Published: 2016

46. Fast-timing measurements of exotic nuclei at ISOLDE: Status report on experiments IS441 and IS474

Author: Fraile, Luis M and Mach, Henryk
Subjects: Detectors and Experimental Techniques
Published: 2014

47. Multiparticle emission in the decay of Ar 31

Author: Koldste, G.T., Blank, B., García Borge, María José, Briz, José Antonio, Carmona Gallardo, M., Fraile, Luis M., Perea, Ángel, Tengblad, Olof, Thomas, J.-C., and Van De Walle, J.
Abstract: G. T. Koldste et al. ; 10 pags. ; 14 figs. ; 4 tabs. ; PACS number(s): 23.40.Hc, 27.30.+t, A multihit capacity setup was used to study the decay of the dripline nucleus 31Ar, produced at the ISOLDE facility at CERN. A spectroscopic analysis of the β-delayed three-proton decay of 31Ar is presented for the first time together with a quantitative analysis of the β-delayed 2pγ decay. A new method for determination of the spin of low-lying levels in the βp daughter 30S using proton-proton angular correlations is presented and used to determine that the spin of the 5.2-MeV level is most likely 3+ with 4+ also possible. The half-life of 31Ar is found to be 15.1(3) ms. An improved analysis of the Fermi β strength including the β3p-decay mode gives a total measured branching ratio of 3.60(44)%, which is lower than the theoretical value found to be 4.24(43)%. Finally, a previously unidentified γ transition from the isobaric analog state in the decay of 33Ar has been found. © 2014 American Physical Society., This work was supported by the European Union Seventh Framework through ENSAR (Contract No. 262010). This work was partly supported by the Spanish Funding Agency under Projects No. FPA2009-07387, No. FPA2010-17142, and No. AIC-D-2011- 0684, by the French ANR (Contract No. ANR-06-BLAN- 0320).
Published: 2014

48. Digital strategies for time and energy measurement for ultra fast scintillators

Author: Sanchez-Tembleque, Victor, primary, Vedia, Victoria, additional, Carmona, Mariano, additional, Fraile, Luis M, additional, Ritt, Stefan, additional, and Udias, Jose Manuel, additional
Published: 2016
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49. Cross-species infectivity of H3N8 influenza virus in an experimental infection in swine

Author: Solórzano, A., Foni, E., Córdoba, Laura, Baratelli, M., Razzuoli, E., Bilato, D., Martín del Burgo, M. Ángeles, Perlin, D. S., Martínez, Jorge, Martínez-Orellana, P., Fraile, Luis M., Chiapponi, C., Amadori, M., Del Real Soldevilla, Gustavo, Montoya, María, Solórzano, A., Foni, E., Córdoba, Laura, Baratelli, M., Razzuoli, E., Bilato, D., Martín del Burgo, M. Ángeles, Perlin, D. S., Martínez, Jorge, Martínez-Orellana, P., Fraile, Luis M., Chiapponi, C., Amadori, M., Del Real Soldevilla, Gustavo, and Montoya, María
Abstract: Avian influenza A viruses have gained increasing attention due to their ability to cross the species barrier and cause severe disease in humans and other mammal species as pigs. H3 and particularly H3N8 viruses, are highly adaptive since they are found in multiple avian and mammal hosts. H3N8 viruses have not been isolated yet from humans; however, a recent report showed that equine influenza A viruses (IAVs) can be isolated from pigs, although an established infection has not been observed thus far in this host. To gain insight into the possibility of H3N8 avian IAVs to cross the species barrier into pigs, in vitro experiments and an experimental infection in pigs with four H3N8 viruses from different origins (equine, canine, avian, and seal) were performed. As a positive control, an H3N2 swine influenza virus A was used. Although equine and canine viruses hardly replicated in the respiratory systems of pigs, avian and seal viruses replicated substantially and caused detectable lesions in inoculated pigs without previous adaptation. Interestingly, antibodies against hemagglutinin could not be detected after infection by hemagglutination inhibition (HAI) test with avian and seal viruses. This phenomenon was observed not only in pigs but also in mice immunized with the same virus strains. Our data indicated that H3N8 IAVs from wild aquatic birds have the potential to cross the species barrier and establish successful infections in pigs that might spread unnoticed using the HAI test as diagnostic tool. © 2015, American Society for Microbiology.
Published: 2015

50. Shape study of the N = Z nucleus Kr-72 via beta decay

Author: European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), SCOAP, Briz, José Antonio, Nácher, Enrique, García Borge, María José, Algora, Alejandro, Rubio, Berta, Dessagne, Ph., Maira-Vidal, A., Cano Ott, Daniel, Courtin, S., Escrig, Diego, Fraile, Luis M., Gelletly, W., Jungclaus, Andrea, Le Scornet, G., Maréchal, F., Miehé, Ch., Poirier, E., Poves, Alfredo, Sarriguren, Pedro, Taín, José Luis, Tengblad, Olof, European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), SCOAP, Briz, José Antonio, Nácher, Enrique, García Borge, María José, Algora, Alejandro, Rubio, Berta, Dessagne, Ph., Maira-Vidal, A., Cano Ott, Daniel, Courtin, S., Escrig, Diego, Fraile, Luis M., Gelletly, W., Jungclaus, Andrea, Le Scornet, G., Maréchal, F., Miehé, Ch., Poirier, E., Poves, Alfredo, Sarriguren, Pedro, Taín, José Luis, and Tengblad, Olof
Abstract: The beta decay of the N = Z nucleus Kr-72 has been studied with the total absorption spectroscopy technique at ISOLDE (CERN). A total B(GT) = 0.79(4)g(A)(2)/4 pi has been found up to an excitation energy of 2.7 MeV. The B(GT) distribution obtained is compared with predictions from state-of-the-art theoretical calculations to learn about the ground state deformation of Kr-72. Although a dominant oblate deformation is suggested by direct comparison with quasiparticle random phase approximation (QRPA) calculations, beyond-mean-field and shell-model calculations favor a large oblate-prolate mixing in the ground state. Published by the American Physical Society
Published: 2015

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