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13 results on '"Purushothaman, Sivaji"'

1. Mean range bunching of exotic nuclei produced by in-flight fragmentation and fission — Stopped-beam experiments with increased efficiency

Author

Dickel, Timo, Hornung, Christine, Amanbayev, Daler, Ayet San Andrés, Samuel, Beck, Sönke, Bergmann, Julian, Geissel, Hans, Gerl, Jürgen, Górska, Magdalena, Gröf, Lizzy, Haettner, Emma, Hucka, Jan-Paul, Kostyleva, Daria A., Kripko-Koncz, Gabriella, Mollaebrahimi, Ali, Mukha, Ivan, Pietri, Stephane, Plaß, Wolfgang R., Podolyák, Zsolt, Purushothaman, Sivaji, Reiter, Moritz Pascal, Roesch, Heidi, Scheidenberger, Christoph, Tanaka, Yoshiki K., Weick, Helmut, and Zhao, Jianwei

Published
2023
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2. Depth dose measurements in water for 11C and 10C beams with therapy relevant energies

Author

Boscolo, Daria, Kostyleva, Daria, Schuy, Christoph, Weber, Uli, Haettner, Emma, Purushothaman, Sivaji, Dendooven, Peter, Dickel, Timo, Drozd, Vasyl, Franczack, Bernhard, Geissel, Hans, Hornung, Christine, Horst, Felix, Kazantseva, Erika, Kuzminchuk-Feuerstein, Natalia, Lovatti, Giulio, Mukha, Ivan, Nociforo, Chiara, Pietri, Stephane, Pinto, Marco, Reidel, Claire-Anne, Roesch, Heidi, Sokol, Olga, Tanaka, Yoshiki K., Weick, Helmut, Zhao, Jianwei, Scheidenberger, Christoph, Parodi, Katia, and Durante, Marco

Published
2022
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3. Separation of atomic and molecular ions by ion mobility with an RF carpet

Author

Miskun, Ivan, Dickel, Timo, San Andrés, Samuel Ayet, Bergmann, Julian, Constantin, Paul, Ebert, Jens, Geissel, Hans, Greiner, Florian, Haettner, Emma, Hornung, Christine, Lippert, Wayne, Mardor, Israel, Moore, Iain, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Reiter, Moritz P., Scheidenberger, Christoph, and Weick, Helmut

Published
2021
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5. Studying Gamow-Teller transitions and the assignment of isomeric and ground states at N = 50

Author

Mollaebrahimi, Ali, Hornung, Christine, Dickel, Timo, Amanbayev, Daler, Kripko-Koncz, Gabriella, Plaß, Wolfgang R., Ayet San Andrés, Samuel, Beck, Sönke, Blazhev, Andrey, Bergmann, Julian, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Kalantar-Nayestanaki, Nasser, Miskun, Ivan, Nowacki, Frédéric, Scheidenberger, Christoph, Bagchi, Soumya, Balabanski, Dimiter L., Brencic, Ziga, Charviakova, Olga, Constantin, Paul, Dehghan, Masoumeh, Ebert, Jens, Gröf, Lizzy, Hall, Oscar, Harakeh, Muhsin N., Kaur, Satbir, Kankainen, Anu, Knöbel, Ronja, Kostyleva, Daria A., Kurkova, Natalia, Kuzminchuk, Natalia, Mardor, Israel, Nichita, Dragos, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Purushothaman, Sivaji, Reiter, Moritz Pascal, Rink, Ann-Kathrin, Roesch, Heidi, Spătaru, Anamaria, Stanic, Goran, State, Alexandru, Tanaka, Yoshiki K., Vencelj, Matjaz, Weick, Helmut, Winfield, John S., Yavor, Michael I., and Zhao, Jianwei

Published
2023
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6. Radioactive Beams for Image-Guided Particle Therapy: The BARB Experiment at GSI

Author

Boscolo, Daria, Kostyleva, Daria, Safari, Mohammad Javad, Anagnostatou, Vasiliki, Äystö, Juha, Bagchi, Soumya, Binder, Tim, Dedes, Georgios, Dendooven, Peter, Dickel, Timo, Drozd, Vasyl, Franczack, Bernhard, Geissel, Hans, Gianoli, Chiara, Graeff, Christian, Grahn, Tuomas, Greiner, Florian, Haettner, Emma, Haghani, Roghieh, Harakeh, Muhsin N., Horst, Felix, Hornung, Christine, Hucka, Jan-Paul, Kalantar-Nayestanaki, Nasser, Kazantseva, Erika, Kindler, Birgit, Knöbel, Ronja, Kuzminchuk-Feuerstein, Natalia, Lommel, Bettina, Mukha, Ivan, Nociforo, Chiara, Ishikawa, Shunki, Lovatti, Giulio, Nitta, Munetaka, Ozoemelam, Ikechi, Pietri, Stephane, Plass, Wolfgang R., Prochazka, Andrej, Purushothaman, Sivaji, Reidel, Claire-Anne, Roesch, Heidi, Schirru, Fabio, Schuy, Christoph, Sokol, Olga, Steinsberger, Timo, Tanaka, Yoshiki K., Tanihata, Isao, Thirolf, Peter, Tinganelli, Walter, Voss, Bernd, Weber, Uli, Weick, Helmut, Winfield, John S., Winkler, Martin, Zhao, Jianwei, Scheidenberger, Christoph, Parodi, Katia, Durante, Marco, Boscolo, Daria, Kostyleva, Daria, Safari, Mohammad Javad, Anagnostatou, Vasiliki, Äystö, Juha, Bagchi, Soumya, Binder, Tim, Dedes, Georgio, Dendooven, Peter, Dickel, Timo, Drozd, Vasyl, Franczack, Bernhard, Geissel, Han, Gianoli, Chiara, Graeff, Christian, Grahn, Tuoma, Greiner, Florian, Haettner, Emma, Haghani, Roghieh, Harakeh, Muhsin N, Horst, Felix, Hornung, Christine, Hucka, Jan-Paul, Kalantar-Nayestanaki, Nasser, Kazantseva, Erika, Kindler, Birgit, Knöbel, Ronja, Kuzminchuk-Feuerstein, Natalia, Lommel, Bettina, Mukha, Ivan, Nociforo, Chiara, Ishikawa, Shunki, Lovatti, Giulio, Nitta, Munetaka, Ozoemelam, Ikechi, Pietri, Stephane, Plaß, Wolfgang R, Prochazka, Andrej, Purushothaman, Sivaji, Reidel, Claire-Anne, Roesch, Heidi, Schirru, Fabio, Schuy, Christoph, Sokol, Olga, Steinsberger, Timo, Tanaka, Yoshiki K, Tanihata, Isao, Thirolf, Peter, Tinganelli, Walter, Voss, Bernd, Weber, Uli, Weick, Helmut, Winfield, John S, Winkler, Martin, Zhao, Jianwei, Scheidenberger, Christoph, Parodi, Katia, Durante, Marco, and Nuclear Energy

Subjects
NUCLEI, Physics::Instrumentation and Detectors, Physics::Medical Physics, PERFORMANCE, PROTON, MOVING TARGETS, SIMULATIONS, carbon ions, PET, Oncology, particle therapy, ADENOID CYSTIC CARCINOMA, RADIATION-THERAPY, IMPLEMENTATION, Physics::Accelerator Physics, ddc:610, Nuclear Experiment, radioactive ion beams, SYSTEM, oxygen ion, RADIOTHERAPY, carbon ion, Original Research, oxygen ions
Abstract

Several techniques are under development for image-guidance in particle therapy. Positron (beta(+)) emission tomography (PET) is in use since many years, because accelerated ions generate positron-emitting isotopes by nuclear fragmentation in the human body. In heavy ion therapy, a major part of the PET signals is produced by beta(+)-emitters generated via projectile fragmentation. A much higher intensity for the PET signal can be obtained using beta(+)-radioactive beams directly for treatment. This idea has always been hampered by the low intensity of the secondary beams, produced by fragmentation of the primary, stable beams. With the intensity upgrade of the SIS-18 synchrotron and the isotopic separation with the fragment separator FRS in the FAIR-phase-0 in Darmstadt, it is now possible to reach radioactive ion beams with sufficient intensity to treat a tumor in small animals. This was the motivation of the BARB (Biomedical Applications of Radioactive ion Beams) experiment that is ongoing at GSI in Darmstadt. This paper will present the plans and instruments developed by the BARB collaboration for testing the use of radioactive beams in cancer therapy.

Published
2021

7. Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag

Author

Hornung, Christine, Amanbayev, Daler, Dedes, Irene, Kripko-Koncz, Gabriella, Miskun, Ivan, Shimizu, Noritaka, Ayet San Andrés, Samuel, Bergmann, Julian, Dickel, Timo, Dudek, Jerzy, Ebert, Jens, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Otsuka, Takaharu, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Scheidenberger, Christoph, Weick, Helmut, Bagchi, Soumya, Blazhev, Andrey, Charviakova, Olga, Curien, Dominique, Finlay, Andrew, Kaur, Satbir, Lippert, Wayne, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Tanaka, Yoshiki K., Tsunoda, Yusuke, and Winfield, John S.

Published
2020
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8. Isomer studies in the vicinity of the doubly-magic nucleus Sn: Observation of a new low-lying isomeric state in Ag

Author

Hornung, Christine, Amanbayev, Daler, Dedes, Irene, Kripko-Koncz, Gabriella, Miskun, Ivan, Shimizu, Noritaka, Ayet San Andrés, Samuel, Bergmann, Julian, Dickel, Timo, Dudek, Jerzy, Ebert, Jens, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Otsuka, Takaharu, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Scheidenberger, Christoph, Weick, Helmut, Bagchi, Soumya, Blazhev, Andrey, Charviakova, Olga, Curien, Dominique, Finlay, Andrew, Kaur, Satbir, Lippert, Wayne, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Tanaka, Yoshiki K., Tsunoda, Yusuke, and Winfield, John S.

Abstract

Long-lived isomeric states in $^{97}$Ag and $^{101−109}$In were investigated with the FRS Ion Catcher at GSI. In the isotope $^{97}$Ag, a long-lived (1/2−) isomeric state was discovered, and its excitation energy was determined to be 618(38) keV. This is simultaneously the first discovery of a nuclear isomeric state by multiple-reflection time-of-flight mass spectrometry. The measured excitation energies were compared to large-scale shell-model calculations, which indicated the importance of core excitation around $^{100}$Sn. Furthermore, advanced mean-field calculations for the $^{97}$Ag nucleus and relevant neighboring nuclei were performed, which have contributed to a better understanding of the repetitive appearance of certain isomeric structures in neighboring nuclei, and which have supported the discovery of the isomeric state in $^{97}$Ag in a global shell-evolution scheme.

Published
2020

9. Mass and half-life measurements of neutron-deficient iodine isotopes.

Author

Ayet San Andrés, Samuel, Mollaebrahimi, Ali, Dickel, Timo, Bergmann, Julian, Ebert, Jens, Geissel, Hans, Greiner, Florian, Haettner, Emma, Hornung, Christine, Kalantar-Nayestanaki, Nasser, Miskun, Ivan, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Scheidenberger, Christoph, Weick, Helmut, Bagchi, Soumya, Constantin, Paul, Finlay, Andrew, and Kaur, Satbir

Subjects
MASS measurement, IODINE isotopes, RELATIVISTIC energy, TIME-of-flight measurements, FORECASTING, ISOTOPES
Abstract

Neutron-deficient iodine isotopes, 116 I and 114 I, were produced at relativistic energies by in-flight fragmentation at the Fragment Separator (FRS) at GSI. The FRS Ion Catcher was used to thermalize the ions and to perform highly accurate mass measurements with a Multiple-Reflection Time-of-Flight Mass-Spectrometer (MR-TOF-MS). The masses of both isotopes were measured directly for the first time. The half-life of the 114 I was measured by storing the ions in an RF quadrupole for different storage times and counting the remaining nuclei with the MR-TOF-MS. The measured half-life was used to assign the ground state to the measured 114 I ions. Predictions on the possible α -decay branch for 114 I are presented based on the reduced uncertainties obtained for the Q α -value. Systematic studies of the mass surface were performed with the newly obtained masses, showing better agreement with the expected trend in this mass region. [ABSTRACT FROM AUTHOR]

Published
2020
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10. Superfluid helium and cryogenic noble gases as stopping media for ion catchers

Author

Purushothaman, Sivaji, Jungmann, Klaus, Dendooven, Peter, and Faculty of Science and Engineering

Subjects
Superkritische media, Helium 2 , Edelgassen, Atoombundels, A, Proefschriften (vorm), kwantumvloeistoffen, kwantum vaste stoffen
Abstract

Many scientific disciplines make use of radioactive ions in the form of a low energy ion beam or a cold ion or atom cloud. Since radioactive isotopes are often best produced at very high energy, techniques to transform high-energy ions efficiently and quickly into low-energy ones are essential. In this context, the usefulness of superfluid helium and cryogenic noble gases was investigated. The extreme purity of cryogenic noble gases allowed to demonstrate for the first time that the maximum efficiency in this kind of systems is determined by the chance of survival of ions during slowing down. This principal limit, a few tens of percent, is high enough to make the method of practical use. Experiments in which high-density cryogenic helium was ionized by a proton beam show the importance of a large electric field; a field that quickly pulls ions and electrons apart and thus prevents neutralization. We demonstrated that at high fields, the maximum efficiency is maintained at ionization densities many times larger than achieved up to now with other systems. Two mechanisms play a role in the extraction of ions out of superfluid helium: thermal excitation, which is strongly temperature dependent, and an as yet unknown temperature independent mechanism. The transition between these two lies at a temperature of about 1.3 Kelvin. The combined efficiency for ion survival in and extraction out of superfluid helium lies between 1 and 10 percent; high enough for practical applications.

Published
2008

11. A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei.

Author

Miskun, Ivan, Dickel, Timo, Mardor, Israel, Hornung, Christine, Amanbayev, Daler, Ayet San Andrés, Samuel, Bergmann, Julian, Ebert, Jens, Geissel, Hans, Górska, Magdalena, Greiner, Florian, Haettner, Emma, Plaß, Wolfgang R., Purushothaman, Sivaji, Scheidenberger, Christoph, Rink, Ann-Kathrin, Weick, Helmut, Bagchi, Soumya, Constantin, Paul, and Kaur, Satbir

Subjects
EXOTIC nuclei, BRANCHING ratios, TIME-of-flight mass spectrometers, ALPHA decay, ION traps, MOTHER-daughter relationship
Abstract

A novel method for simultaneous measurement of masses, Q-values, isomer excitation energies, half-lives and decay branching ratios of exotic nuclei has been demonstrated. The method includes first use of a stopping cell as an ion trap, combining storage of mother and daughter nuclides for variable durations in a cryogenic stopping cell (CSC), and afterwards the identification and counting of them by a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). We utilized our method to record the decay and growth of the 216Po and 212Pb isotopes (alpha decay) and of the 119m2Sb isomer ( t 1 / 2 = 850 ± 90 ms) and 119gSb isotope (isomer transition), obtaining half-lives consistent with literature values. The amount of non-nuclear-decay losses in the CSC up to ∼ 10 s is negligible, which exhibits its extraordinary cleanliness. For 119Sb isotopes, we present the first direct measurements of the mass of its ground state, and the excitation energy and decay branching ratios of its second isomeric state (119m2Sb). This resolves discrepancies in previous excitation energy data, and is the first direct evidence that the 119m2Sb isomer decays dominantly via γ emission. These results pave the way for the measurement of branching ratios of exotic nuclei. [ABSTRACT FROM AUTHOR]

Published
2019
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12. Radioactive Beams for Image-Guided Particle Therapy: The BARB Experiment at GSI

Author

Kostyleva, Daria, Safari, Mohammad Javad, Anagnostatou, Vasiliki, Äystö, Juha, Bagchi, Soumya, Binder, Tim, Dedes, Georgios, Dendooven, Peter, Dickel, Timo, Drozd, Vasyl, Franczack, Bernhard, Geissel, Hans, Gianoli, Chiara, Graeff, Christian, Grahn, Tuomas, Greiner, Florian, Haettner, Emma, Haghani, Roghieh, Harakeh, Muhsin N., Horst, Felix, Hornung, Christine, Hucka, Jan-Paul, Kalantar-Nayestanaki, Nasser, Kazantseva, Erika, Kindler, Birgit, Knöbel, Ronja, Kuzminchuk-Feuerstein, Natalia, Lommel, Bettina, Mukha, Ivan, Nociforo, Chiara, Ishikawa, Shunki, Lovatti, Giulio, Nitta, Munetaka, Ozoemelam, Ikechi, Pietri, Stephane, Plaß, Wolfgang R., Prochazka, Andrej, Purushothaman, Sivaji, Reidel, Claire-Anne, Roesch, Heidi, Schirru, Fabio, Schuy, Christoph, Sokol, Olga, Steinsberger, Timo, Tanaka, Yoshiki K., Tanihata, Isao, Thirolf, Peter, Tinganelli, Walter, Voss, Bernd, Weber, Uli, Weick, Helmut, Winfield, John S., Winkler, Martin, Zhao, Jianwei, Scheidenberger, Christoph, Parodi, Katia, and Durante, Marco

Subjects
3. Good health
Abstract

Frontiers in oncology 11, 737050 (2021). doi:10.3389/fonc.2021.737050, Published by Frontiers Media, Lausanne

13. Precision of the PET activity range during irradiation with 10 C, 11 C, and 12 C beams

Author

Kostyleva, D., Purushothaman, Sivaji, Dendooven, P., Haettner, Emma, Geissel, H., Ozoemelam, I., Schuy, C., Weber, U., Boscolo, Daria, Dickel, T., Drozd, V., Graeff, C., Franczak, B., Hornung, C., Horst, F., Kazantseva, E., Kuzminchuk-Feuerstein, N., Mukha, I., Nociforo, C., Pietri, S., Reidel, C. A., Roesch, H., Tanaka, Y. K., Weick, H., Zhao, J., Durante, Marco, Parodi, K., and Scheidenberger, C.

Subjects
carbon ions, PET, Radiological and Ultrasound Technology, particle therapy, Radiology, Nuclear Medicine and imaging, ddc:530, radioactive ion beams, range verification
Abstract

Physics in medicine and biology 68(1), 015003 (2023). doi:10.1088/1361-6560/aca5e8, Published by IOP Publ., Bristol

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