41 results on '"Gašparić, Igor"'
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2. Preface
- Author
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Milin Matko, Mijatović Tea, and Gašparić Igor
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Physics ,QC1-999 - Published
- 2024
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3. Investigating nuclei produced in 9Li +11B reaction
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Sigmund Margareta, Soić Neven, Alcorta Moreno Martin, Bishop Jack, Brooks Alexander D., Davinson Thomas, Dell’Aquila Daniele, Di Pietro Alessia, Falezza Fillippo, Freer Martin, Gašparić Igor, Jelavić Malenica Deša, Kokalova Wheldon Tzany, La Cognata Marco, Lennarz Annika, Lihtar Ivana, Martel Bravo Ismael, Milin Matko, Müller Gatermann Claus, Parker Cody, and Vukman Nikola
- Subjects
Physics ,QC1-999 - Abstract
In this contribution, a preliminary analysis of the first part of the experiment S2012 conducted at the ISAC-II facility of Canada’s particle accelerator center TRIUMF in Vancouver will be presented. The experiment aims to study highly clustered structures of nuclei created in multi-nucleon transfer reactions of 9Li radioactive beam on natural boron target (11B and 10B). The main objective of the experiment is to study exotic structures created in neutron-rich 16C nucleus in the range of higher excitation energies. The analysis presented here probes the existence of exotic cluster configurations and the quality of detected results using the invariant mass techniques.
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- 2024
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4. Exploring cluster structures in the high excitation energy region of Be, B, and C isotopes via 10B + 10B nuclear reactions
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Jelavić Malenica Deša, Milin Matko, Di Pietro Alessia, Figuera Pierpaolo, Gašparić Igor, Mijatović Tea, Musumarra Agatino, Pellegriti Maria Grazia, Scuderi Valentina, Soić Neven, Szilner Suzana, and Uroić Milivoj
- Subjects
Physics ,QC1-999 - Abstract
The unique opportunity presented by 10B + 10B reactions to study high-energy, high-spin states in the A=10 mass region is explored. Results from the measurement at 72 MeV are presented, the most important being new and rarely seen states in the 12C [1] and 13C [2], which motivate targeted future experiments. In particular, a new state of 12C at Ex = 24.4 MeV is strongly populated in the triple α-particle coincidences, while the rarely seen state at Ex = 30.3 MeV is found to be strong in the d+10B decay channel, reinforcing the previous suggestions that it has the exotic 2α+2d molecular structure [3]. Regarding the 13C nucleus, a potentially novel state at Ex = 19.0 MeV is prominently observed in α+ 9Be coincidences and demonstrates a well-defined cluster structure. Lastly, high-spin states in mirror nuclei pairs 9Be-9B, 10Be-10C and 11B-11C populated in the presented measurement are explored.
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- 2024
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5. Exploring cluster structures in the high excitation energy region of Be, B, and C isotopes via 10B + 10B nuclear reactions.
- Author
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Jelavić Malenica, Deša, Milin, Matko, Di Pietro, Alessia, Figuera, Pierpaolo, Gašparić, Igor, Mijatović, Tea, Musumarra, Agatino, Pellegriti, Maria Grazia, Scuderi, Valentina, Soić, Neven, Szilner, Suzana, and Uroić, Milivoj
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CLUSTERING of particles ,EXCITATION spectrum ,ISOTOPES ,MOLECULES ,HEAVY nuclei - Abstract
The unique opportunity presented by
10 B +10 B reactions to study high-energy, high-spin states in the A=10 mass region is explored. Results from the measurement at 72 MeV are presented, the most important being new and rarely seen states in the12 C [1] and13 C [2], which motivate targeted future experiments. In particular, a new state of12 C at Ex = 24.4 MeV is strongly populated in the triple α-particle coincidences, while the rarely seen state at Ex = 30.3 MeV is found to be strong in the d+10 B decay channel, reinforcing the previous suggestions that it has the exotic 2α+2d molecular structure [3]. Regarding the13 C nucleus, a potentially novel state at Ex = 19.0 MeV is prominently observed in α+9 Be coincidences and demonstrates a well-defined cluster structure. Lastly, high-spin states in mirror nuclei pairs9 Be-9 B,10 Be-10 C and11 B-11 C populated in the presented measurement are explored. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
6. Investigating nuclei produced in 9Li +11B reaction.
- Author
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Sigmund, Margareta, Soić, Neven, Alcorta Moreno, Martin, Bishop, Jack, Brooks, Alexander D., Davinson, Thomas, Dell'Aquila, Daniele, Di Pietro, Alessia, Falezza, Fillippo, Freer, Martin, Gašparić, Igor, Jelavić Malenica, Deša, Kokalova Wheldon, Tzany, La Cognata, Marco, Lennarz, Annika, Lihtar, Ivana, Martel Bravo, Ismael, Milin, Matko, Müller Gatermann, Claus, and Parker, Cody
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PARTICLES ,PARTICLES (Nuclear physics) ,BORON ,RADIOACTIVE nuclear beams - Abstract
In this contribution, a preliminary analysis of the first part of the experiment S2012 conducted at the ISAC-II facility of Canada's particle accelerator center TRIUMF in Vancouver will be presented. The experiment aims to study highly clustered structures of nuclei created in multi-nucleon transfer reactions of
9 Li radioactive beam on natural boron target (11 B and10 B). The main objective of the experiment is to study exotic structures created in neutron-rich16 C nucleus in the range of higher excitation energies. The analysis presented here probes the existence of exotic cluster configurations and the quality of detected results using the invariant mass techniques. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
7. Coulomb dissociation of 16O into 4He and 12C
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Bott Lukas Thomas, Göbel Kathrin, Heil Michael, Kelić-Heil Aleksandra, Reifarth René, Aliotta Marialuisa, Almusidi Tahani, Alvarez-Pol Hector, Atar Leyla, Atkins Liam, Aumann Thomas, Bemmerer Daniel, Benlliure José, Bertulani Carlos, Boretzky Konstanze, Brückner Benjamin, Brandenburg Leonhard, Bruni Giovanni, Cabanelas Eiras Pablo, Caesar Christoph, Casarejos Enrique, Cederkall Joakim, Chulkov Leonid, Cortina-Gil Dolores, Danilov Andrey, De Filippo Enrico, Dellmann Sophia Florence, Deuter Isabell, Dueñas Díaz José Antonio, Duer Meytal, Elekes Zoltan, Erbacher Philipp, Escribano Rodriguez Sonia, Fülöp Zsolt, Falduto Ashton, Feijoo Manuel, Fiebiger Stefan, Gašparić Igor, Galaviz Daniel, García Borge María José, García-Jiménez Gabriel, Geraci Elena, Gernhäuser Roman, Glorius Jan, Gnoffo Brunilde, González Caamaño David, Graña González Antia, Grein Alexander, Hartig AnnaLena, Heftrich Tanja, Heggen Henning, Heine Marcel, Heinz Andreas, Henrich Corinna, Hensel Thomas, Holl Matthias, Homm Ilja, Horváth Ákos, Horvat Andrea, Jedele Andrea, Jelavic Malenica Desa, Jenegger Tobias, Johansson Håkan T., Jonson Björn, Kahlbow Julian, Kalantar-Nayestanaki Nasser, Kamenyero Armel, Khasawneh Kafa, Kiselev Oleg, Klenze Philipp, Knösel Marco, Koch Karsten, Kohls Marvin, Körper Daniel, Kröll Thorsten, Krasilovskaja Sabina, Kresan Dmytro, Kurtulgil Deniz, Kurz Nikolaus, Löher Bastian, Langer Christoph, Lederer-Woods Claudia, Lehr Christopher, Litvinov Yuri A, Lorenz Enis, Martorana Nunzia Simona, Motobayashi Tohru, Murillo Morales Silvia, Nacher Enrique, Nilsson Thomas, Pagano Emanuele Vincenzo, Panin Valerii, Park Joochun, Paschalis Stefanos, Perea Angel, Petri Marina, Pirrone Sara, Plag Ralf, Ponnath Lukas, Popočovski Romana, Reich Markus, Rhee Han-Bum, Rodriguez Sanchez Jose Luis, Rossi Dominic, Russotto Paolo, Sánchez-Benítez Ángel-Miguel, Sürder Christian, Savran Deniz, Scheit Heiko, Schmidt Konrad, Schulte Hendrik, Simon Haik, Simon Johannes, Starostin Viktor, Storck-Dutine Sonja, Törnqvist Hans Toshihide, Tanaka Junki, Tengblad Olof, Thomas Benedikt, Trimarchi Marina, Typel Stefan, Varga László, Volk Klaus, Volknandt Meiko, Wagner Vadim, Wamers Felix, Weigand Mario, and Zanetti Lorenzo
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Physics ,QC1-999 - Abstract
We measured the Coulomb dissociation of 16O into 4He and 12C within the FAIR Phase-0 program at GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, Germany. From this we will extract the photon dissociation cross section 16O(α,γ)12C, which is the time reversed reaction to 12C(α,γ)16O. With this indirect method, we aim to improve on the accuracy of the experimental data at lower energies than measured so far. The expected low cross section for the Coulomb dissociation reaction and close magnetic rigidity of beam and fragments demand a high precision measurement. Hence, new detector systems were built and radical changes to the R3B setup were necessary to cope with the high-intensity 16O beam. All tracking detectors were designed to let the unreacted 16O ions pass, while detecting the 12C and 4He.
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- 2023
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8. Coulomb dissociation of $^{16}O$ into $^{4}He$ and $^{12}C$
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Bott, Lukas Thomas, Göbel, Kathrin, Heil, Michael, Kelić-Heil, Aleksandra, Reifarth, René, Aliotta, Marialuisa, Almusidi, Tahani, Alvarez-Pol, Hector, Atar, Leyla, Atkins, Liam, Aumann, Thomas, Bemmerer, Daniel, Benlliure, José, Bertulani, Carlos, Boretzky, Konstanze, Brückner, Benjamin, Brandenburg, Leonhard, Bruni, Giovanni, Cabanelas Eiras, Pablo, Caesar, Christoph, Casarejos, Enrique, Cederkall, Joakim, Chulkov, Leonid, Cortina-Gil, Dolores, Danilov, Andrey, De Filippo, Enrico, Dellmann, Sophia Florence, Deuter, Isabell, Dueñas Díaz, José Antonio, Duer, Meytal, Elekes, Zoltan, Erbacher, Philipp, Escribano Rodriguez, Sonia, Fülöp, Zsolt, Falduto, Ashton, Feijoo, Manuel, Fiebiger, Stefan, Gašparić, Igor, Galaviz, Daniel, García Borge, María José, García-Jiménez, Gabriel, Geraci, Elena, Gernhäuser, Roman, Glorius, Jan, Gnoffo, Brunilde, González Caamaño, David, Graña González, Antia, Grein, Alexander, Hartig, AnnaLena, Heftrich, Tanja, Heggen, Henning, Heine, Marcel, Heinz, Andreas, Henrich, Corinna, Hensel, Thomas, Holl, Matthias, Homm, Ilja, Horváth, Ákos, Horvat, Andrea, Jedele, Andrea, Jelavic Malenica, Desa, Jenegger, Tobias, Johansson, Håkan T., Jonson, Björn, Kahlbow, Julian, Kalantar-Nayestanaki, Nasser, Kamenyero, Armel, Khasawneh, Kafa, Kiselev, Oleg, Klenze, Philipp, Knösel, Marco, Koch, Karsten, Kohls, Marvin, Körper, Daniel, Kröll, Thorsten, Krasilovskaja, Sabina, Kresan, Dmytro, Kurtulgil, Deniz, Kurz, Nikolaus, Löher, Bastian, Langer, Christoph, Lederer-Woods, Claudia, Lehr, Christopher, Litvinov, Yuri A, Lorenz, Enis, Martorana, Nunzia Simona, Motobayashi, Tohru, Murillo Morales, Silvia, Nacher, Enrique, Nilsson, Thomas, Pagano, Emanuele Vincenzo, Panin, Valerii, Park, Joochun, Paschalis, Stefanos, Perea, Angel, Petri, Marina, Pirrone, Sara, Plag, Ralf, Ponnath, Lukas, Popočovski, Romana, Reich, Markus, Rhee, Han-Bum, Rodriguez Sanchez, Jose Luis, Rossi, Dominic, Russotto, Paolo, Sánchez-Benítez, Ángel-Miguel, Sürder, Christian, Savran, Deniz, Scheit, Heiko, Schmidt, Konrad, Schulte, Hendrik, Simon, Haik, Simon, Johannes, Starostin, Viktor, Storck-Dutine, Sonja, Törnqvist, Hans Toshihide, Tanaka, Junki, Tengblad, Olof, Thomas, Benedikt, Trimarchi, Marina, Typel, Stefan, Varga, László, Volk, Klaus, Volknandt, Meiko, Wagner, Vadim, Wamers, Felix, Weigand, Mario, and Zanetti, Lorenzo
- Abstract
10th Conference on Nuclear Physics in Astrophysics, NPA-X 2022, Geneva, Switzerland, 5 Sep 2022 - 9 Sep 2022; The European physical journal / Web of Conferences 279, 04003 (2023). doi:10.1051/epjconf/202327904003, Published by EDP Sciences, Les Ulis
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- 2023
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9. Pairing Forces Govern Population of Doubly Magic Ca- 54 from Direct Reactions
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Browne, F., Chen, S., Doornenbal, P., Obertelli, A., Ogata, K., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Boretzky, K., Caesar, C., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, Igor, Gerst, R.-B., Gibelin, J., Hahn, K. I., Holl, M., Kahlbow, J., Kim, D., Körper, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Miki, K., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Schindler, F., Simon, H., Söderström, P-A., Sohler, D., Takeuchi, S., Törnqvist, H., Tscheuschner, J., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.
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Nuclear structure ,direct reactions ,radioactive beams - Abstract
Direct proton-knockout reactions of Sc-55 at similar to 220 MeV/nucleon were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of Ca-54 were investigated through -ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological intemucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors, which describe the wave function overlap of the Sc- 55 ground state with states in Ca-54. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of Sc-55, valence proton removals populated predominantly the ground state of Ca-54. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.
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- 2021
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10. Investigation of the ground-state spin inversion in the neutron-rich Cl-47,Cl-49 isotopes
- Author
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Linh, B. D., Corsi, A., Gillibert, A., Obertelli, A., Doornenbal, P., Barbieri, C., Chen, S., Chung, L. X., Duguet, T., Gómez-Ramos, M., Holt, J. D., Moro, A., Navrátil, P., Ogata, K., Phuc, N. T. T., Shimizu, N., Somà, V., Utsuno, Y., Achouri, N. L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Cortés, M. L., Delbart, A., Gheller, J.-M., Giganon, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Flavigny, F., Franchoo, S., Gašparić, Igor, Gerst, R.-B., Gibelin, J., Hahn, K. I., Khai, N. T., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Sohler, D., Söderström, P.-A., Takeuchi, S., Ton, N. D., Törnqvist, H., Vaquero, V., Wagner, V., Wang, H., Werner, V., Xu, X., Yamada, Y., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.
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Nuclear structure ,direct reactions ,radioactive beams - Abstract
A first gamma-ray study of Cl-47, Cl-49 spectroscopy was performed at the Radioactive Isotope Beam Factory with 50 Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt deexcitation gamma rays were measured with the NaI(T1) array DALI2(+). Through the one-proton knockout reaction Ar-50(p, 2p), a spin assignment could be determined for the low- lying states of Cl-49 from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity J(pi) = 3/2(+) is deduced for the ground state of Cl-49, similar to the recently studied N = 32 isotope K-51. The evolution of the energy difference E(1/2(1)(+)) - E (3/2(1)(+)) is compared to state-of-the-art theoretical predictions.
- Published
- 2021
11. First spectroscopic study of V-63 at the N=40 island of inversion
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Juhász, M. M., Elekes, Z., Sohler, D., Sieja, K., Yoshida, K., Ogata, K., Doornenbal, P., Obertelli, A., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J.-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Achouri, N. L, Aktas, O., Aumann, T., Chung, L. X., Dombrádi, Zs., Flavigny, F., Franchoo, S., Gašparić, Igor, Gerst, R.-B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Liu, H. N., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P.-A., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.
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Nuclear structure ,shell model ,gamma spectroscopy ,radioactive beams - Abstract
The low-lying level structure of V-63 was studied for the first time by the inelastic proton scattering and the proton knock-out reaction in inverse kinematics. The comparison of the newly observed gamma- ray transitions at 696(8) keV and 889(16) keV with our shell-model calculations using the Lenzi-Nowacki-Poves-Sieja interaction established two excited states proposed to be the first 11/2(-) and 9/2(-) levels. The (p, p') excitation cross sections were analyzed by the coupled channel formalism assuming pure quadrupole as well as quadrupole+hexadecapole deformations. This resulted in large deformation parameters placing V-63 in the island of inversion located below Ni-68.
- Published
- 2021
- Full Text
- View/download PDF
12. N=32 shell closure below calcium: Low-lying structure of Ar50
- Author
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Cortés, M. L., Rodriguez, W., Doornenbal, P., Obertelli, A., Holt, J. D., Menéndez, J., Ogata, K., Schwenk, A., Shimizu, N., Simonis, J., Utsuno, Y., Yoshida, K., Achouri, L., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Delbart, A., Gheller, J.- M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, Igor, Gerst, R.-B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P.-A., Sohler, D., Takeuchi, S., Toernqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.
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Nuclear Theory ,Physics::Accelerator Physics ,Nuclear Experiment ,nuclear shell model ,magic numbers ,gamma-ray spectroscopy ,radioactive beams - Abstract
Low-lying excited states in the N = 32 isotope Ar-50 were investigated by in-beam gamma-ray spectroscopy following proton- and neutron-knockout, multinucleon removal, and proton inelastic scattering at the RIKEN Radioactive Isotope Beam Factory. The energies of the two previously reported transitions have been confirmed, and five additional states are presented for the first time, including a candidate for a 3(-) state. The level scheme built using gamma gamma coincidences was compared to shell-model calculations in the sd-pf model space and to ab initio predictions based on chiral two- and three-nucleon interactions. Theoretical proton- and neutron-knockout cross sections suggest that two of the new transitions correspond to 2(+) states, while the previously proposed 4(1)(+) state could also correspond to a 2(+) state.
- Published
- 2020
13. Extending the Southern Shore of the Island of Inversion to F28
- Author
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Revel, A., Sorlin, O., Marqués, F. M., Kondo, Y., Kahlbow, J., Nakamura, T., Orr, N. A., Nowacki, F., Tostevin, J. A., Yuan, C. X., Achouri, N. L., Al Falou, H., Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Crawford, H. L., Delaunay, F., Delbart, A., Deshayes, Q., Dombrádi, Z., Douma, C. A., Elekes, Z., Fallon, P., Gašparić, Igor, Gheller, J.-M., Gibelin, J., Gillibert, A., Harakeh, M. N., He, W., Hirayama, A., Hoffman, C. R., Holl, M., Horvat, A., Horváth, Á., Hwang, J. W., Isobe, T., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., de Oliveira Santos, F., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Rossi, D., Saito, A. T., Saito, T., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, Y., Simon, H., Sohler, D., Stuhl, L., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Yang, Z., Yasuda, M., Yoneda, K., and SAMURAI21 collaboration
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Nuclear Theory ,Binding energy and masses ,Direct reactions ,Energy levels and level densities ,Models and methods for nuclear reactions ,Rare and new isotopes ,Nuclear Experiment - Abstract
Detailed spectroscopy of the neutron-unbound nucleus F28 has been performed for the first time following proton/neutron removal from Ne29/F29 beams at energies around 230 MeV/nucleon. The invariant- mass spectra were reconstructed for both the F(*)27+n and F(*)26+2n coincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as the F28 ground state, with Sn(F28)=-199(6) keV, while analysis of the 2n decay channel allowed a considerably improved Sn(F27)=1620(60) keV to be deduced. Comparison with shell-model predictions and eikonal-model reaction calculations have allowed spin-parity assignments to be proposed for some of the lower-lying levels of F28. Importantly, in the case of the ground state, the reconstructed F27+n momentum distribution following neutron removal from F29 indicates that it arises mainly from the 1p3/2 neutron intruder configuration. This demonstrates that the island of inversion around N=20 includes F28, and most probably F29, and suggests that O28 is not doubly magic.
- Published
- 2020
- Full Text
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14. Wide-acceptance measurement of the K−/K+ ratio from Ni+Ni collisions at 1.91A GeV
- Author
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Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Le Fèvre, A., Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Münzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tymiński, Z., Wagner, P., Weber, Ivana, Widmann, E., Wiśniewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., Zmeskal, J., and FOPI Collaboration
- Subjects
Nuclear Theory ,High Energy Physics::Experiment ,heavy-ion collisions ,charged kaons ,in-medium ,strange particles ,Nuclear Experiment - Abstract
The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semicentral collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K−/K+ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of ϕ(1020) meson decays to the K− yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of K− to K+ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at 1.23A and 1.76A GeV indicate that after inclusion of the ϕ meson decay contribution to the K− production no difference between the slopes of the K− and K+ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the ϕ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of Λ(1520)→pK− decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance.
- Published
- 2019
- Full Text
- View/download PDF
15. Centrality dependence of subthreshold phi meson production in Ni plus Ni collisions at 1.9A GeV
- Author
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Piasecki, K., Tyminski, Z., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Le Fevre, A., Liu, J.L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Munzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek- Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Wagner, P., Weber, Ivana, Widmann, E., Wisniewski, K., Xiao, Z.G., Xu, H.S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.
- Subjects
High Energy Physics::Experiment ,heavy-ion collisions ,ni-58+ni-58 collisions ,sis energies ,2 agev ,strangeness ,symmetry ,detector ,kaons ,fopi ,Nuclear Experiment - Abstract
We analyzed the ϕ meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6±1.6(stat) ±1.5(syst)]×10−4. This new data point allows us for the first time to inspect the centrality dependence of subthreshold ϕ meson production in heavy-ion collisions. The rise of ϕ meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent α=1.8±0.6. The ratio of ϕ to K− production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36±0.05.
- Published
- 2016
- Full Text
- View/download PDF
16. Influence of Phi mesons on negative kaons in Ni + Ni collisions at 1.91A GeV beam energy
- Author
-
Piasecki, K., Herrmann, K., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P, Cargnelli, M., Čaplar, Roman, Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Kotte, R., Lebedev, A., Leifels, Y., Le Fèvre, A., Liu, J.L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, Ivana, Widmann, E., Wiśniewski, K., Xiao, Z.G, Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.
- Subjects
Nuclear Theory ,Heavy ion reactions ,Negative Kaons ,Phi mesons ,High Energy Physics::Experiment ,Nuclear Experiment - Abstract
ϕ and K− mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semicentral events amounting to 52% of the total cross section. The phase-space distributions, and the total yield of K−, as well as the kinetic energy distribution and the total yield of ϕ mesons are presented. The ϕ/ K− ratio is found to be 0.44±0.07(stat)+0.16−0.10(syst), meaning that about 22% of K−mesons originate from the decays of ϕ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signaling that a considerable share of gap between the slopes of K+ and K −could be explained by the contribution of ϕ mesons to negative kaons.
- Published
- 2015
17. Azimuthal emission patterns of K+ and of K- mesons in Ni plus Ni collisions near the strangeness production threshold
- Author
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Zinyuk, V., Kang, T.I., Leifels, Y., Herrmann, N., Hong, B., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Carević, Ivana, Crochet, P., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K.D., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Kotte, R., Lebedev, A., Le Fevre, A., Liu, J.L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Munzer, R., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynka, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wisniewski, K., Xiao, Z.G., Yushmanov, I, Zhang, Y, Zhilin, A, and Zmeskal, J.
- Subjects
High Energy Physics::Phenomenology ,Nuclear Theory ,High Energy Physics::Experiment ,Nuclear Experiment ,heavy-ion collisions ,relativistic nuclear collisions ,equation-of-state ,antikaon production ,kaon production ,dense nuclear ,sis energies ,matter ,flow ,dynamics - Abstract
Azimuthal emission patterns of K+/- mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum p(T) integrated directed and elliptic flow of K+ and K- mesons as well as the centrality dependence of p(T) - differential directed flow of K+ mesons are compared to the predictions of hadron string dynamics and isospin quantum molecular dynamics transport models. The data exhibits different propagation patterns of K+ and K- mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for K+ mesons and attractive for K- mesons.
- Published
- 2014
- Full Text
- View/download PDF
18. The NEUland detector of the R3B collaboration
- Author
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Gašparić, Igor
- Subjects
nuclear physics ,heavy-ions ,intermediate energies ,Sneutron detection - Abstract
xxx xxx
- Published
- 2012
19. Eksperimentalno proučavanje pionske fuzije 4He(3He, π0)7Be
- Author
-
Gašparić, Igor and Čaplar, Roman
- Subjects
pionska fuzija ,magnetski spektrometar ,pionic fusion ,subthreshold pion production ,Physics ,CsI(Tl) scintillator ,CsI (Tl) scintilator ,stvaranje piona ispod praga ,magnetic spectrometer ,NATURAL SCIENCES. Physics ,phoswich ,PRIRODNE ZNANOSTI. Fizika ,udc:53(043.3) ,Fizika - Abstract
Pionic fusion reactions where two nuclei fuse into a new one by emitting a pion need a highly coherent mechanism and therefore give an insight into the collective motion of nucleons in nuclei. The reaction 4He(3He,π0)7Be has been studied experimentally at beam energies about 10 MeV above the coherent production threshold. The experiment was performed at KVI, Groningen using the AGOR accelerator facility. The created nuclei were detected in a phoswich detector array in the focal plane of the Big-Bite Spectrometer in coincidence with the photons from neutral pion decay which were detected in the Plastic Ball detector. The Plastic Ball contains 552 phoswich detectors covering polar laboratory angles 50◦
- Published
- 2011
20. Eksperimentalno proučavanje pionske fuzije ^4He(^3He, π^0)^7Be
- Author
-
Gašparić, Igor
- Subjects
Nuclear Theory ,pionska fuzija ,stvaranje piona ispod praga ,CsI(Tl) scintilator ,phoswich ,magnetski spektrometar ,Nuclear Experiment - Abstract
Pionic fusion reactions where two nuclei fuse into a new one by emitting a pion need a highly coherent mechanism and therefore give an insight into the collective motion of nucleons in nuclei. The reaction ^4He(^3He, π^0)^7Be has been studied experimentally at beam energies about 10 MeV above the coherent production threshold. The experiment was performed at KVI, Groningen using the AGOR accelerator facility. The created nuclei were detected in a phoswich detector array in the focal plane of the Big-Bite Spectrometer in coincidence with the photons from neutral pion decay which were detected in the Plastic Ball detector. The Plastic Ball contains 552 phoswich detectors covering polar laboratory angles 50^o
- Published
- 2011
21. Design, instrumentation and response characteristics of a 2 pi multi-detector of CsI(Tl) scintillators mounted inside the Plastic Ball spectrometer
- Author
-
Joulaeizadeh, L., Gašparić, Igor, Bacelar, J., Čaplar, Roman, Lohner, H., Research unit Nuclear & Hadron Physics, and KVI - Center for Advanced Radiation Technology
- Subjects
Light output ,Physics::Instrumentation and Detectors ,Cosmic muons ,CsI(Tl) scintillator ,Energy calibration - Abstract
A 2 pi hemispherical detector consisting of 64 CsI(Tl) scintillator modules covering the angular range of 80 degrees -160 degrees has been constructed. This detector is employed as the Inner Shell of the Plastic Ball detector and was used in two experimental programs concerning the study of pionic fusion in light-ion systems. The geometry and construction are presented. The improved response of the combined detectors for photons are discussed. An energy calibration method using high energy cosmic muons for the Inner Shell and the Plastic Ball has been developed and the calibration results are compared to the results of the same method in the Monte-Carlo simulation. The improved acceptance of the combined detectors for the pi(0) detection in the (6)Li((4)He, pi(0))(10)B* experiment are presented and discussed. (C) 2010 Elsevier B.V. All rights reserved.
- Published
- 2010
22. Measurement of K*(892)(0) and K-0 mesons in Al plus Al collisions at 1.9A GeV
- Author
-
Lopez, X., Herrmann, N., Piasecki, K., Andronić, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M. L., Buehler, P., Cargnelli, M., Čaplar, Roman, Crochet, P., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fijal-Kirejczyk, I., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kirejczyk, M., Kim, Y. J., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Ryu, M., Schmidt, P., Schuettauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wisniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, X. Y., Zhilin, A., Zmeskal, J., Kienle, P., and Yamazaki, T.
- Subjects
heavy-ion collisions ,k+ mesons ,dynamics ,flow - Abstract
A new measurement of subthreshold K*(892)(0) and K-0 production is presented. The experimental data complete the measurement of strange particles produced in Al + Al collisions at 1.9A GeV measured with the FOPI detector at SIS at GSI (Darmstadt). The K*(892)(0)/K-0 yield ratio is found to be 0.0315 +/- 0.006(stat.) +/- 0.012(syst.) and is in good agreement with the transport model prediction. These measurements provide information on the in-medium cross section of K+-pi(-) fusion, which is the dominant process in subthreshold K*(892)(0) production.
- Published
- 2010
23. Measurement of the In-Medium K0 Inslusive Cross Section in pi(-)-Induced reactions at 1.15 GeV/c
- Author
-
Benabderrahmane, M. L., Herrmann, N., Wisniewski, K., Kecskemeti, J., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Deppner, I., Crochet, P., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kienle, P., Kirejczyk, M., Kim, Y. J., Kiš, Mladen, Koczoń, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Lopez, X., Manko, V., Marton, J., Mangiarotti, A., Merschmeyer, M., Matulewicz, T., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Rogowska, M., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Widmann, E., Xiao, Z. G., Yamazaki, T., Yushmanov, I., Zhang, X. Y., Zhilin, A., Zmeskal, J., Bratkovskaya E., and Cassing, W.
- Subjects
Nuclear Theory ,High Energy Physics::Experiment ,Nuclear Experiment ,K0 meson cross section ,pi(-) reactions - Abstract
The K0 meson production by - mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20± ; 5 MeV at normal nuclear matter density.
- Published
- 2009
- Full Text
- View/download PDF
24. Study of all reaction channels in deuteron-deuteron scattering
- Author
-
Ramazani-Moghaddam-Arani, A., Amir-Ahmadi, H.R., Bacher, A.D., Bailey, C., Biegun, A., Eslami-Kalantari, M., Gašparić, Igor, Joulaeizadeh, L., Kalantar-Nayestanaki, N., Kistryn, St., Kozela, A., Mardanpour, H., Messchendorp, J.G., Micherdzinska, A.M., Moeini, H., Shende, S.V., Stephan, E., Stephenson, E.J., Sworst, R., and KVI - Center for Advanced Radiation Technology
- Subjects
deuteron ,Physics ,Nuclear and High Energy Physics ,Scattering ,Nuclear Theory ,Measure (physics) ,General Physics and Astronomy ,three-nucleon force ,elastic ,break-up ,Astronomy and Astrophysics ,Inelastic scattering ,Few-body systems ,Nuclear physics ,Deuterium ,Three-nucleon force ,Nuclear force ,Tensor ,Nucleon ,Nuclear Experiment - Abstract
Few-nucleon systems can be used as fundamental laboratories for studying details of the nuclear force effects. We performed a series of deuteron-deuteron scattering experiments at intermediate energies. The experiments exploited BINA and BBS experimental setups and polarized deuteron beams with kinetic energies of 65 and 90 MeV/nucleon. These experiments aim to measure differential cross sections, vector and tensor analyzing powers of all available reaction channels in deuteron-deuteron scattering. With these data we will provide a systematic database, which will be used to test present theoretical approximations and upcoming ab-initio calculations in four-nucleon system.
- Published
- 2009
- Full Text
- View/download PDF
25. Pionic Fusion in Light-Ion Systems
- Author
-
Joulaeizadeh, L., Bacelar, J., Čaplar, Roman, Eslami Kalantari, M., Gašparić, Igor, Kalantar-Nayestanaki, N., Löhner, H., Mardanpour, H., Messchendorp, J.G., Moeini, H., Ramazani-Moghaddam-Arani, A., Shende, A., Stephan, E., Prepolec, Lovro, and Nikšić, Tamara
- Subjects
Nuclear Theory ,pionic fusion ,neutral pion production ,subthreshold energy ,Nuclear Experiment - Abstract
Two pionic fusion experiments have been performed using the AGOR accelerator facility at KVI in order to study the role of pions in the nuclear interaction. Pionic fusion is a highly coherent process in which two nuclei fuse to a united nucleus and the available centre-of-mass energy is emitted in the pion channel. The reactions 4He(3He,
- Published
- 2009
26. Pionic fusion Experiments at subthreshold energies
- Author
-
Joulaeizadeh, L., Bacelar, J., Gašparić, Igor, and Lohner, H.
- Subjects
Nuclear Theory ,pionic fusion ,neutral pion production ,subthreshold energy ,Nuclear Experiment - Abstract
In order to study the role of pions and clustering phenomena in nuclei, two experiments have been performed using the AGOR accelerator facility. In collisions of two nuclei a pion and a fused nucleus were produced. The examined reactions were He-4(He-3, pi(0))Be-7 and Li-6(He-4, pi(0)) B-10 at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). Since the available energy is well below the pion production threshold in an elementary nucleon-nucleon process, a highly coherent mechanism is needed. We identified the reaction by measuring the fused system in the magnetic spectrometer and the produced neutral pions in the Plastic Ball detection system with large acceptance. Our experimental setup provided the exclusive cross sections by identifying all products in overdetermined kinematics. Here we present the preliminary results of die ongoing analysis for the second reaction. About 700 events fulfilling the kinematical conditions for an outgoing B-10 and a pi(0) decaying with large opening angle have been selected. Angular distribution of neutral pions will be discussed.
- Published
- 2008
27. Pionic fusion experiments at KVI
- Author
-
Gašparić, Igor, Bacelar, J., Čaplar, Roman, Joulaeizadeh, L., Loehner, H., and Freer, Martin
- Subjects
Nuclear Theory ,pionic fusion ,cluster ,Plastic Ball ,Nuclear Experiment - Abstract
Two experiments aiming to study pionic fusion of light nuclei were performed using the AGOR accelerator facility. In such reactions a pion and a fused nucleus are produced in a collision of two nuclei. The examined reactions are 4He(3He, pi0)7Be and 6Li(4He, pi0)10B at beam energies about 10 MeV above the coherent pion production threshold (261 MeV and 234 MeV). Since the energy is well below the pion production threshold in an elementary nucleon-nucleon process a highly coherent mechanisms is needed (1). Produced nuclei were detected and identified in a phoswich detector array in the focal plane of the BBS spectometer (2) and photons originating from pion decay in the Plastic Ball detector (3). The Plastic Ball contains 552 phoswich modules covering polar laboratory angles between 60 and 160 degrees in almost the full azimuthal range. It is equipped with an inner shell of 64 CsI crystals in order to improve photon conversion. The results of the ongoing analyses of the first reaction will be presented. Approximately 700 good events fulfilling the kinematical condition for an outgoing 7Be and a pi0 decaying with large opening angle have been selected. The angular distribution of neutral pions will be discussed. (1)T. Kajino. H. Toki and K. Kubo, Phys. rev. C35, 1370 (1987) (2) A.M. van der Berg, Nucl. Instr. and Meth. B99, 637 (1995) (3) A. Baden et al., Nucl. Instr. and Meth. 203, 189 (1982)
- Published
- 2007
28. Isospin dependence of relative yields of K^+ and K^0 mesons at 1.528A GeV
- Author
-
Lopez, X., Kim, Y. J., Herrmann, N., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M. L., Čaplar, Roman, Cordier, E., Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Ryu, M. S., Schuttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wagner, P., Wi´sniewski, K., Wohlfarth, D., Xiao, Z. G., Yushmanov, I., Zhang, X. Y., Zhilin, A., Ferini, G., and Gaitanos, T.
- Subjects
Nuclear Theory ,heavy ions ,kaons ,strangeness ,isospin ,1.5 AGeV ,Nuclear Experiment - Abstract
Results on K+ and K0 meson production in 96 44Ru + 96 44Ru and 96 40Zr + 96 40Zr collisions at a beam kinetic energy of 1.528A GeV, measured with the FOPI detector at GSI-Darmstadt, are investigated as a possible probe of isospin effects in high-density nuclear matter. The measured double ratio (K+/K0)Ru/(K+/K0)Zr is compared to the predictions of a thermal model and a relativistic mean field transport model using two different collision scenarios and under different assumptions on the stiffness of the symmetry energy.We find good agreement with the thermal model prediction and the assumption of a soft symmetry energy for infinite nuclear matter, while more realistic transport simulations of the collisions show a similar agreement with the data but also exhibit a reduced sensitivity to the symmetry term.
- Published
- 2007
29. Subthreshold production of Sigma (1385) baryons in Al+Al collisions at 1.9A GeV
- Author
-
Lopez, X., Herrmann, N., Crochet, P., Andronić, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M..L., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Dupieux, P., Dželalija, Mile, Fabietti, L., Fodor, Z., Gašparić, Igor, Grishkin, Y., Hartmann, O..N., Hildenbrand, K..D., Hong, B., Kang, T..I., Kecskemeti, J., Kirejczyk, M., Kim, Y..J., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Piasecki, K., Rami, F., Reisdorf, W., Ryu, M. S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wi´sniewski, K., Wohlfarth, D., Xiao, Z. G., Yushmanov, I., Zhang, X. Y., Zhilin, A., Zmeskal, J., Kienle, P., and Yamazaki, T.
- Subjects
heavy-ion reaction ,subthreshold production ,Sigma baryon ,Nuclear Theory ,Nuclear Experiment - Abstract
First measurement of subthreshold Sigma(1385) production is presented. Experimental data are presented for Al+Al reactions at 1.9A GeV measured with the FOPI detector at SIS/GSI. The Sigma(1385)/Lambda ratio is found to be in good agreement with the transport and statistical model predictions. The results allowfor a better understanding of subthreshold strangeness production and strangeness exchange reaction which is the dominant process for K− production below and close-to threshold.
- Published
- 2007
30. Proton-proton bremsstrahlung towards the elastic limit at 190 MeV incident beam energy
- Author
-
Mahjour-Shafiei, M., Amir-Ahmadi, H.R., Bacelar, J.C.S., Castelijns, R., Ermisch, K., van Garderen, E.D., Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Kiš, Mladen, and Lohner H. Scholten O.
- Subjects
nucleon-nucleon interaction ,proton-proton bremsstrahlung ,elastic limit low-energy photon ,Nuclear Experiment - Abstract
A series of nucleon-nucleon bremsstrahlung (NN gamma) experiments at 190 MeV incident beam energy have been performed at KVI in order to gain more insight into the dynamics governing the bremsstrahlung reaction. After initial measurements wherein the bremsstrahlung process was studied far away from the elastic limit, a new study was used to probe the process nearer to the elastic limit by measuring at lower photon energies. Measured cross sections and analyzing powers are compared with the predictions of a microscopic model and those of two soft-photon models. The theoretical calculations overestimate the data by up to approximate to 30%, for some kinematics.
- Published
- 2006
31. First analysis of anisotropic flow with Lee-Yang zeros
- Author
-
Bastid, N., Andronic, A., Barret, V., Basrak, Zoran, Benabderrahmane, M.L., Čaplar, Roman, Cordier, E., Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gašparić, Igor, Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Mangiarotti, A., Manko, V., Merschmeyer, M., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Schuettauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolarkiewicz, M.M., Smolyankin, V., Soliwoda, I.J., Stockmeier, M.R., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z., Yushmanov, I, Zhilin, A., Ollitrault, J.-Y., and Borghini, N.
- Subjects
Nuclear Theory ,Nuclear Experiment ,anisotropic flow ,Lee-Yang zeros ,heavy-ion collisions ,azimuthal correlations - Abstract
We report on the first analysis of directed and elliptic flow with the new method of Lee– Yang zeros. Experimental data are presented for Ru+Ru reactions at 1.69A GeV measured with the FOPI detector at SIS/GSI. The results obtained with several methods, based on the event-plane reconstruction, on Lee– Yang zeros, and on multiparticle cumulants (up to fifth order) applied for the first time at SIS energies, are compared. They show conclusive evidence that azimuthal correlations between nucleons and composite particles at this energy are largely dominated by anisotropic flow.
- Published
- 2005
32. Excitation function of elliptic flow in Au + Au collisions and nuclear matter equation of state
- Author
-
Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, L., Berek, G., Čaplar, Roman, Cordier, E., Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gašparić, Igor, Grishkin, Yu., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Mangiarotti, A., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., de Schauenburg, B., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńskak, K., Smolyankin, V., Stockmeier, M.R., Stoicea, G., Tyminski, Z., Wagner, P., Wiśniewski, K., Wohlfarth, D., Xiao, Z.-G., Yushmanov, I., and Zhiling, A.
- Subjects
Nuclear Experiment ,elliptic flow ,compressed nuclear matter ,equation of state - Abstract
We present measurements of the excitation function of elliptic flow at midrapidity in Au + Au collisions at beam energies from 0.09 to 1.49 GeV per nucleon. For the integral flow, we discuss the interplay between collective expansion and spectator shadowing for three centrality classes. A complete excitation function of transverse momentum dependence of elliptic flow is presented for the first time in this energy range, revealing a rapid change with incident energy below , followed by an almost perfect scaling at the higher energies. The equation of state of compressed nuclear matter is addressed through comparisons to microscopic transport model calculations.
- Published
- 2005
33. Virtual-photon and double photon bremsstrahlung in proton-proton scattering
- Author
-
Kiš, Mladen, Bacelar, J.C.S, Castelijns, R., Čaplar, Roman, Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Loehner, H., Mahjour-Shafiei, M., Messchendorp, J.G., Amir-Ahmadi, H., Castelijns, R.J.J., Kalantar-Nayestanaki, N., Kok, L.P., Messchendorp, J.G., and Kniewald, Zlatko
- Subjects
photon ,proton ,bremsstrahlung ,Nuclear Theory ,Physics::Accelerator Physics ,double photon bremsstrahlung ,proton-proton scattering ,Nuclear Experiment - Abstract
The bremsstrahlung measurements have as goal to probe nucleon-nucleon interaction in a kinematical region where the nucleons are off their mass shell. At the KVI, a high quality proton beam of 190 MeV is used with a liquid hydrogen target to investigate the bremsstrahlung process in proton-proton scattering.
- Published
- 2004
34. Real proton-proton bremsstrahlung at 190 MeV
- Author
-
Mahjour-Shafiei, M., Amir-Ahmadi, H.R., Bacelar, J.C.S., Ermisch, K., Garderen, E.D. van, Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Kiš, Mladen, Loehner, H., Amir-Ahmadi, H., Castelijns, R.J.J., Kalantar-Nayestanaki, N., Kok, L.P., and Messchendorp
- Subjects
Nuclear Theory ,Physics::Accelerator Physics ,Nuclear Experiment ,proton-proton bremsstrahlung - Abstract
The understanding of the strong force acting between nucleons is one of the most fundamental problems addressed by nuclear physics. The simplest reactions to study this frce with, besides elastic scattering, is proton-proton real and virtual bremsstrahlung. Since the mid 90s, a series of experiments were setup at KVI to study real and virtual proton-proton bremsstrahlung at 190 MeV in which the kinematics are chosen such that one goes as far away as possible from the elastic channel, thereby producing high energy photons.
- Published
- 2004
35. Dilepton and double-photon production in proton-proton scattering at 190 MeV
- Author
-
Čaplar, Roman, Bacelar, J.C.S., Gašparić, Igor, Kalantar-Nayestanaki, N., Kiš, Mladen, Loehner, H., Shafiei, M.M., Jolos, Rastislav, and Scheid, Werner
- Subjects
Nuclear Theory ,Nuclear Experiment ,proton-proton scattering - Abstract
A necessary ingredient for the understanding of atomic nuclei and nuclear matter is detailed and precise knowledge of the nucleon-nucleon interaction.
- Published
- 2002
36. Dilepton production in proton-proton scattering at 190 MeV
- Author
-
Bacelar, J.C.S., Castelijns, R., Čaplar, Roman, Ermisch, K., Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Kiš, Mladen, Loehner, H., Mahjour-Shafiei, M., Krivec, Raymund, Golh, Bojan, Rosina, Mitja, and Širca, Simon
- Subjects
proton-proton scattering - Abstract
xxx
- Published
- 2002
37. High-precision measurements of proton-proton bremsstrahlung
- Author
-
Mahjour-Shafiei, M., Amir-Ahmadi, H., Bacelar, J.C.S., Castelijns, R., Ermisch, K., Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Kiš, Mladen, Loehner, H., Jolos, Rastislav, and Scheid, Werner
- Subjects
Nuclear Theory ,Nuclear Experiment ,proton-proton bremsstrahlung - Abstract
The understanding of the strong force acting between nucleons is one of the most fundamental problems addressed by nuclear physics. One of the simplest reactions to study this force, besides elastic scattering, is proton-proton bremsstrahlung.
- Published
- 2002
38. Double bremsstrahlung in proton-proton scattering at 190 MeV
- Author
-
Bacelar, J.C.S., Castelijns, R., Čaplar, Roman, Ermisch, K., Gašparić, Igor, Harakeh, M.N., Kalantar-Nayestanaki, N., Kiš, Mladen, Loehner, H., Mahjour-Shafiei, M., Krivec, Raymund, Golh, Bojan, Rosina, Mitja, Širca, Simon, and Kniewald, Zlatko
- Subjects
bremstrahlung ,proton-proton scattering ,Nuclear Theory ,Mathematics::Metric Geometry ,Physics::Accelerator Physics ,double bremsstrahlung ,Nuclear Experiment ,Computer Science::Databases - Abstract
Many propoerties of the strong force can be exhaustively examined in proton-proton collision experiments.
- Published
- 2002
39. Atomska jezgra - nepresušan izvor iznenađenja
- Author
-
Basrak, Zoran, Szilner, Suzana, Eudes, Ph., Haas, F., Čaplar, Roman, Dželalija, Mile, Gašparić, Igor, Korolija, Milorad i FOPI suradnja, Jakšić, Milko, Kokanović, Ivan, and Milošević, Slobodan
- Subjects
fizika teških iona ,površinska prozirnost ,refraktivne pjave ,binarni disipativni sudari ,pseudo prozirnost ,nuklearna tvar - Abstract
xxx
- Published
- 2001
40. Coulomb dissociation of $^{16}O$ into $^{4}He$ and $^{12}C$
- Author
-
Göbel, Kathrin, Heil, Michael, Bott, Lukas, Brandenburg, Leonard, Caesar, Christoph, Deuter, Isabell, Grein, Alexander, Keliç-Heil, Aleksandra, Körper, Daniel, Löher, Bastian, Reifarth, René, Savran, Deniz, Schulte, Hendrik, Simon, Haik, Törnqvist, Hans, Almusidi, Tahani, Álvarez-Pol, Héctor, Atkins, Liam, Aumann, Thomas, Bemmerer, Daniel, Benlliure, José, Boretzky, Konstanze, Brückner, Benjamin, Eiras, Pablo Cabanelas, Casarejos, Enrique, Cederkall, Joakim, Chulkov, Leonid, Cortina-Gil, Dolores, Danilov, Rey, Erbacher, Philipp, Rodriguez, Sonia Escribano, Fülöp, Zsolt, Falduto, Ashton, Fiebiger, Stefan, Gašparić, Igor, Borge, Maria José Garcia, Gernhäuser, Roman, Glorius, Jan, Caamaño, David Gonzales, Hartig, Anna-Lena, Heftrich, Tanja, Heggen, Henning, Heine, Marcel, Heinz, Reas, Hensel, Thomas, Holl, Matthias, Johansson, Håkan T., Jonson, Björn, Kalantar-Nayestanaki, Nasser, Kamenyero, Armel, Khasawneh, Kafa, Kiselev, Oleg, Klenze, Philipp, Kohls, Marvin, Kröll, Thorsten, Kresan, Dmytro, Kurtulgil, Deniz, Kurz, Nikolaus, Langer, Christoph, Lehr, Christopher, Litvinov, Yuri, Lorenz, Enis, Morales, Silvia Murillo, Nacher, Enrique, Nilsson, Thomas, Park, Joochun, Paschalis, Stefanos, Perea, Angel, Petri, Marina, Plag, Ralf, Ponnath, Lukas, Popocovski, Romana, Reich, Markus, Rhee, Han-Bum, Sanchez, Jose Luis Rodriguez, Rossi, Dominic, Scheit, Heiko, Schmidt, Konrad, Slavkovská, Zuzana, Starostin, Viktor, Storck, Sonja, Sürder, Christian, Tanaka, Junki, Tengblad, Olof, Thomas, Benedikt, Typel, Stefan, Varga, László, Volk, Klaus, Volknandt, Meiko, Wagner, Vadim, Wamers, Felix, Weigand, Mario, and Zanetti, Lorenzo
- Subjects
7. Clean energy - Abstract
Nuclear Physics in Astrophysics IX (NPA-IX), 15-20 September 2019, Frankfurt, Germany, NPA-IX, Frankfurt, Germany, 15 Sep 2019 - 20 Sep 2019; Journal of physics / Conference series 1668, 012016 (2020). doi:10.1088/1742-6596/1668/1/012016, Published by IOP Publ., Bristol
41. Usporedba periodičnih struktura višega reda u genomima čovjeka i neandertalca
- Author
-
Vlahović, Ines, Glunčić, Matko, Rosandić, Marija, Paar, V ladimir, Smolčić, Vernesa, Bilušić, Ante, Buljan, Maja, Gašparić, Igor, Horvatić, Vlasta, Kumerički, Krešimir, Kotnik-Karuza, Dubravka, Milošević, Slobodan, Planinić, Mirko, Požek, Miroslav, Stanić, Denis, and Tomić, Silvia
- Subjects
genomi čovjeka ,neandertalca ,periodičnosti višega reda ,NBPF - Abstract
U ovom izlaganju prikazali smo rezultate analize genoma čovjeka i neandertalca na primjeru prvog kromosoma dobivene računalnim programom Global Repeat Map. Ti rezultati su pokazali identifikaciju periodičnosti višega reda koje se pojavljuju u oba genoma na sekvenci koja je identificirana da se nalazi u NBPF obitelji gena.
- Published
- 2015
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