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1. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
Published: 2024

2. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
Published: 2024

3. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
Published: 2024

4. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
Published: 2024

5. WASA-FRS EXPERIMENTS IN FAIR PHASE-0 AT GSI

Author: Tanaka, Y. K., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V, Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Fujioka, H., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Lommel, B., Metag, V., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, T. R., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tang, X., Tortorelli, N., Vencel, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Zhao, J., Tanaka, Y. K., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V, Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Fujioka, H., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Lommel, B., Metag, V., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, T. R., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tang, X., Tortorelli, N., Vencel, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., and Zhao, J.
Abstract: We have developed a new and unique experimental setup integrating the central part of the Wide Angle Shower Apparatus (WASA) into the Fragment Separator (FRS) at GSI. This combination opens up possibilities of new experiments with high-resolution spectroscopy at forward 0 and measurements of light decay particles with nearly full solid-angle acceptance in coincidence. The first series of the WASA-FRS experiments have been successfully carried out in 2022. The developed experimental setup and two physics experiments performed in 2022 including the status of the preliminary data analysis are introduced.
Published: 2023
Full Text: View/download PDF

6. Studies of three-and four-body hypernuclei with heavy-ion beams, nuclear emulsions and machine learning

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., and Zhao, J.
Abstract: Interests on few-body hypernuclei have been increased by recent results of experiments employing relativistic heavy ion beams. Some of the experiments have revealed that the lifetime of the lightest hypernucleus, hypertriton, is significantly shorter than 263 ps which is expected by considering the hypertriton to be a weakly-bound system. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Lambda nn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in the WASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.
Published: 2023
Full Text: View/download PDF

7. Studies of three-and four-body hypernuclei with heavy-ion beams, nuclear emulsions and machine learning

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., and Zhao, J.
Abstract: Interests on few-body hypernuclei have been increased by recent results of experiments employing relativistic heavy ion beams. Some of the experiments have revealed that the lifetime of the lightest hypernucleus, hypertriton, is significantly shorter than 263 ps which is expected by considering the hypertriton to be a weakly-bound system. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Lambda nn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in the WASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.
Published: 2023
Full Text: View/download PDF

8. Studies of three-and four-body hypernuclei with heavy-ion beams, nuclear emulsions and machine learning

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., and Zhao, J.
Abstract: Interests on few-body hypernuclei have been increased by recent results of experiments employing relativistic heavy ion beams. Some of the experiments have revealed that the lifetime of the lightest hypernucleus, hypertriton, is significantly shorter than 263 ps which is expected by considering the hypertriton to be a weakly-bound system. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Lambda nn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in the WASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.
Published: 2023
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9. The WASA-FRS project at GSI and its perspective

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. H., Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Fujioka, H., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grafia, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Lommel, B., Metag, V., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. H., Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Fujioka, H., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grafia, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Lommel, B., Metag, V., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., and Zhao, J.
Abstract: A novel technique to study bound states of exotic hadrons in subatomic nuclei, such as hypernuclei and mesic nuclei, has been developed by employing the Fragment Separator FRS and the WASA central detector at GSI. Two experiments, S447 for studying light hypernuclei, especially hypertriton and a Ann bound state, and S490 for searching for ri' mesic-nuclei, were recently performed. Data analyses are currently in progress, and light charged particles such as protons and x & PLUSMN; are clearly observed and identified in the both experiments. For S447, light nuclear fragments that can also be residual nuclei from decays of hypernuclei of interests have been analysed by the FRS, and a momentum resolution, Ap/p, of 5 x 10-4 has been achieved. Further data analyses are to be completed. The WASA-FRS project will be continued and extended with the FRS at FAIR Phase 0, and upgrading of the WASA magnet and detectors is currently in progress. Furthermore, construction of a larger detector system with the Super-FRS at FAIR Phase 1 is also under consideration.
Published: 2023
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10. Studies of three-and four-body hypernuclei with heavy-ion beams, nuclear emulsions and machine learning

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., and Zhao, J.
Abstract: Interests on few-body hypernuclei have been increased by recent results of experiments employing relativistic heavy ion beams. Some of the experiments have revealed that the lifetime of the lightest hypernucleus, hypertriton, is significantly shorter than 263 ps which is expected by considering the hypertriton to be a weakly-bound system. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Lambda nn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in the WASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.
Published: 2023
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11. Studies of three-and four-body hypernuclei with heavy-ion beams, nuclear emulsions and machine learning

Author: Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., Zhao, J., Saito, T. R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K. -H, Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontan, M., Gao, Y., Geissel, H., Goldenbaum, F., Gonzalez, A. Grana, Haettner, E., Harakeh, M. N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Minami, S., Morrissey, D. J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H. J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodriguez-Sanchez, J. L., Roy, P., Ruber, Roger, Saito, N., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Sugimoto, S., Suzuki, K., Szczepanczyk, B., Taki, M., Tanaka, Y. K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., Yoshimoto, M., and Zhao, J.
Abstract: Interests on few-body hypernuclei have been increased by recent results of experiments employing relativistic heavy ion beams. Some of the experiments have revealed that the lifetime of the lightest hypernucleus, hypertriton, is significantly shorter than 263 ps which is expected by considering the hypertriton to be a weakly-bound system. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Lambda nn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in the WASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.
Published: 2023
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12. Decay studies in the A∼225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author: Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Perez Vidal, R. M., Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, Maria, Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I., Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I., Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs., Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M.-M., Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V., Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I., Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., Zyriliou, A., Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Perez Vidal, R. M., Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, Maria, Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I., Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I., Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs., Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M.-M., Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V., Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I., Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., and Zyriliou, A.
Abstract: The HISPEC-DESPEC collaboration aims at investigating the structure of exotic nuclei formed in fragmentation reactions with decay spectroscopy measurements, as part of the FAIR Phase-0 campaign at GSI. This paper reports on first results of an experiment performed in spring 2021, with a focus on beta-decaystudies in the Po-Fr nuclei in the 220 < A <230 island of octupole deformation exploiting the DESPEC setup. Ion-beta correlations and fast-timing techniques are being employed, giving an insight into this difficult-to-reach region.
Published: 2022
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13. Decay studies in the A similar to 225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author: Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Vidal, R. M. Perez, Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, M., Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V, Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I, Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I, Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs, Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M-M, Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V, Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I, Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., Zyriliou, A., Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Vidal, R. M. Perez, Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, M., Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V, Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I, Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I, Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs, Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M-M, Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V, Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I, Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., and Zyriliou, A.
Abstract: The HISPEC-DESPEC collaboration aims at investigating the struc-ture of exotic nuclei formed in fragmentation reactions with decay spectroscopymeasurements, as part of the FAIR Phase-0 campaign at GSI. This paper reportson first results of an experiment performed in spring 2021, with a focus on beta-decaystudies in the Po-Fr nuclei in the 220 < A <230 island of octupole deformationexploiting the DESPEC setup. Ion-beta correlations and fast-timing techniques arebeing employed, giving an insight into this difficult-to-reach region.
Published: 2022

14. Nature of seniority symmetry breaking in the semimagic nucleus Ru-94

Author: Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P. H., Aktas, O., Albers, H. M., Banerjee, A., Chishti, M. M. R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A. K., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, J., Arici, T., Bagchi, S., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Hornung, Ch, Hucka, J. P., John, P. R., Kojouharov, I, Knoebel, R., Kostyleva, D., Kuzminchuk, N., Mukha, I, Plass, W. R., Singh, B. S. Nara, Vasiljevic, J., Pietri, S., Podolyak, Zs, Rudigier, M., Roesch, H., Sahin, E., Schaffner, H., Scheidenberger, C., Schirru, F., Sharma, A., Shearman, R., Tanaka, Y., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A. M., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Haefner, G., Heggen, H., Kahl, D., Karayonchev, V, Kern, R., Korgu, A., Kosir, G., Kurz, N., Lozeva, R., Mikolajczuk, M., Napiralla, P., Page, R., Petrache, C. M., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P. J., Zimba, G., Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P. H., Aktas, O., Albers, H. M., Banerjee, A., Chishti, M. M. R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A. K., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, J., Arici, T., Bagchi, S., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Hornung, Ch, Hucka, J. P., John, P. R., Kojouharov, I, Knoebel, R., Kostyleva, D., Kuzminchuk, N., Mukha, I, Plass, W. R., Singh, B. S. Nara, Vasiljevic, J., Pietri, S., Podolyak, Zs, Rudigier, M., Roesch, H., Sahin, E., Schaffner, H., Scheidenberger, C., Schirru, F., Sharma, A., Shearman, R., Tanaka, Y., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A. M., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Haefner, G., Heggen, H., Kahl, D., Karayonchev, V, Kern, R., Korgu, A., Kosir, G., Kurz, N., Lozeva, R., Mikolajczuk, M., Napiralla, P., Page, R., Petrache, C. M., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P. J., and Zimba, G.
Abstract: Direct lifetime measurements via gamma -gamma coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N = 50) nucleus Ru-94. The experiment was carried out as the first in a series of FAIR-0 experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in Ru-94 were populated primarily via the beta-delayed proton emission of Pd-95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe-124 beam impinging on a 4 g/cm(2) Be-9 target. While the deduced E2 strength for the 2(+) -> 0(+) transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4(+) -> 2(+) transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the f pg proton hole space with respect to doubly magic Sn-100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority v = 2, I-pi = 4(+) state and that of a close-lying v = 4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6(+) -> 4(+) transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations.
Published: 2022

15. First coupling of the FRS particle identification and the FRS-Ion Catcher data acquisition systems: The case of 109In

Author: European Commission, Ministry of Research and Innovation (Romania), Federal Ministry of Education and Research (Germany), Universität Giessen, Helmholtz International Center for FAIR, Science and Technology Facilities Council (UK), Spătaru, A., Hornung, C., Dickel, T., Haettner, E., Pietri, S., Ayet San Andrés, S., Bagchi, S., Balabanski, D.L., Bergmann, J., Ebert, J., Finley, A., Geissel, H., Greiner, F., Hall, O., Kaur, S., Lippert, W., Miskun, I., Otto, J. H., Plaß, W. R., Prochazka, A., Purushothaman, S., Rappold, Christophe, Rink, A. K., Scheidenberger, C., Tanaka, Y. K., Toernqvist, H., Weick, H., Winfield, J. S., European Commission, Ministry of Research and Innovation (Romania), Federal Ministry of Education and Research (Germany), Universität Giessen, Helmholtz International Center for FAIR, Science and Technology Facilities Council (UK), Spătaru, A., Hornung, C., Dickel, T., Haettner, E., Pietri, S., Ayet San Andrés, S., Bagchi, S., Balabanski, D.L., Bergmann, J., Ebert, J., Finley, A., Geissel, H., Greiner, F., Hall, O., Kaur, S., Lippert, W., Miskun, I., Otto, J. H., Plaß, W. R., Prochazka, A., Purushothaman, S., Rappold, Christophe, Rink, A. K., Scheidenberger, C., Tanaka, Y. K., Toernqvist, H., Weick, H., and Winfield, J. S.
Abstract: For the first time, the FRagment Separator (FRS) and the Multiple-Reflection Time-Of-Flight Mass-Spectrometer (MR-TOF-MS) particle identification (PID) systems at GSI have been coupled. This new approach adds to the standard FRS PID an additional unambiguous identification of the fragments and the possibility to identify and count long-lived isomeric states (>ms). For this purpose, single-event timestamp information given by a common clock was used to correlate both systems. Two methods were implemented to improve the signal-to-background ratio by more than a factor 2 in the high resolution mass spectrum obtained with the MR-TOF-MS for the 109In isotope. Moreover, the coupling of the systems allows an improvement in the on-line monitoring of the FRS-Ion Catcher (IC) efficiency and extraction time. In addition, range calculations were implemented in the on-line monitoring; a powerful tool for real-time optimization of stopped beam experiments.
Published: 2022

16. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Funding Agencies|BrightnESS project (EU Horizon 2020, INFRADEV-3-2015) [676548]; Swedish research council VR-RFISwedish Research Council [2017-00646_9]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-0053]
Published: 2021
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17. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Funding Agencies|BrightnESS project (EU Horizon 2020, INFRADEV-3-2015) [676548]; Swedish research council VR-RFISwedish Research Council [2017-00646_9]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-0053]
Published: 2021
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18. DESPEC Phase-0 campaign at GSI

Author: Polettini, M., Jazrawi, S., Chishti, M. M. R., Yaneva, A., Das, B., Banerjee, A., Hubbard, N., Mistry, A. K., Albers, H. M., Shearman, R., Gorska, M., Gerl, J., Regan, P. H., Cederwall, B., Jolie, J., Alhomaidhi, S., Arici, T., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Heggen, H., John, P. R., Kojouharov, I, Kurz, N., Singh, B. S. Nara, Pietri, S., Podolyak, Zs, Rudigier, M., Sahin, E., Schaffner, H., Scheidenberger, C., Sharma, A., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Aktas, O., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Grawe, H., Haefner, G., Kahl, D., Karayonchev, V, Kern, R., Kosir, G., Lozeva, R., Napiralla, P., Page, R., Petrache, C. M., Petrovic, J., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P., Zimba, G., Polettini, M., Jazrawi, S., Chishti, M. M. R., Yaneva, A., Das, B., Banerjee, A., Hubbard, N., Mistry, A. K., Albers, H. M., Shearman, R., Gorska, M., Gerl, J., Regan, P. H., Cederwall, B., Jolie, J., Alhomaidhi, S., Arici, T., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Heggen, H., John, P. R., Kojouharov, I, Kurz, N., Singh, B. S. Nara, Pietri, S., Podolyak, Zs, Rudigier, M., Sahin, E., Schaffner, H., Scheidenberger, C., Sharma, A., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Aktas, O., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Grawe, H., Haefner, G., Kahl, D., Karayonchev, V, Kern, R., Kosir, G., Lozeva, R., Napiralla, P., Page, R., Petrache, C. M., Petrovic, J., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P., and Zimba, G.
Abstract: This paper reports preliminary results of the DESPEC campaign at GSI, focused on the study of neutron-deficient nuclei approaching Sn-100. The results presented show the isomeric decays of excited states with I-pi = 14(+) and 8(+) in Pd-96 and Pd-94, respectively. The detailed characterisation of the DESPEC set-up and analysis methodologies, proven in this experimental run, are crucial for the future campaigns.
Published: 2021

19. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Funding Agencies|BrightnESS project (EU Horizon 2020, INFRADEV-3-2015) [676548]; Swedish research council VR-RFISwedish Research Council [2017-00646_9]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-0053]
Published: 2021
Full Text: View/download PDF

20. DESPEC Phase-0 campaign at GSI

Author: Polettini, M., Jazrawi, S., Chishti, M. M. R., Yaneva, A., Das, B., Banerjee, A., Hubbard, N., Mistry, A. K., Albers, H. M., Shearman, R., Gorska, M., Gerl, J., Regan, P. H., Cederwall, B., Jolie, J., Alhomaidhi, S., Arici, T., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Heggen, H., John, P. R., Kojouharov, I, Kurz, N., Singh, B. S. Nara, Pietri, S., Podolyak, Zs, Rudigier, M., Sahin, E., Schaffner, H., Scheidenberger, C., Sharma, A., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Aktas, O., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Grawe, H., Haefner, G., Kahl, D., Karayonchev, V, Kern, R., Kosir, G., Lozeva, R., Napiralla, P., Page, R., Petrache, C. M., Petrovic, J., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P., Zimba, G., Polettini, M., Jazrawi, S., Chishti, M. M. R., Yaneva, A., Das, B., Banerjee, A., Hubbard, N., Mistry, A. K., Albers, H. M., Shearman, R., Gorska, M., Gerl, J., Regan, P. H., Cederwall, B., Jolie, J., Alhomaidhi, S., Arici, T., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Heggen, H., John, P. R., Kojouharov, I, Kurz, N., Singh, B. S. Nara, Pietri, S., Podolyak, Zs, Rudigier, M., Sahin, E., Schaffner, H., Scheidenberger, C., Sharma, A., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Aktas, O., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Grawe, H., Haefner, G., Kahl, D., Karayonchev, V, Kern, R., Kosir, G., Lozeva, R., Napiralla, P., Page, R., Petrache, C. M., Petrovic, J., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P., and Zimba, G.
Abstract: This paper reports preliminary results of the DESPEC campaign at GSI, focused on the study of neutron-deficient nuclei approaching Sn-100. The results presented show the isomeric decays of excited states with I-pi = 14(+) and 8(+) in Pd-96 and Pd-94, respectively. The detailed characterisation of the DESPEC set-up and analysis methodologies, proven in this experimental run, are crucial for the future campaigns.
Published: 2021

21. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, Ilias, Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, Ilias, Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
Published: 2021

22. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Funding Agencies|BrightnESS project (EU Horizon 2020, INFRADEV-3-2015) [676548]; Swedish research council VR-RFISwedish Research Council [2017-00646_9]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-0053]
Published: 2021
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23. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author: Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I, Birch, Jens, Lai, Chung-Chuan, Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Foerster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Hoglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Loehman, O., Maulerova, V, Mauritzon, N., Mueller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.
Abstract: The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Funding Agencies|BrightnESS project (EU Horizon 2020, INFRADEV-3-2015) [676548]; Swedish research council VR-RFISwedish Research Council [2017-00646_9]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-0053]
Published: 2021
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24. Spectroscopy of η′-mesic nuclei with WASA at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., Zhaoh, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., and Zhaoh, J.
Abstract: We plan to conduct an experimental search for eta'-mesic nuclei in order to investigate in-medium properties of the eta' meson. A 2.5 GeV proton beam is employed to produce eta'-mesic C-11 nuclei with the C-12(p,d)eta'circle times C-11 reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from eta'-mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described.
Published: 2020
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25. Spectroscopy of η′-mesic nuclei with WASA at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., Zhaoh, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., and Zhaoh, J.
Abstract: We plan to conduct an experimental search for eta'-mesic nuclei in order to investigate in-medium properties of the eta' meson. A 2.5 GeV proton beam is employed to produce eta'-mesic C-11 nuclei with the C-12(p,d)eta'circle times C-11 reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from eta'-mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described.
Published: 2020
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26. Spectroscopy of η′-mesic nuclei with WASA at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., Zhaoh, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, Hooi Jin, Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, R., Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, Isao, Terashima, S., Weick, H., Yamamoto, A., and Zhaoh, J.
Abstract: We plan to conduct an experimental search for eta'-mesic nuclei in order to investigate in-medium properties of the eta' meson. A 2.5 GeV proton beam is employed to produce eta'-mesic C-11 nuclei with the C-12(p,d)eta'circle times C-11 reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from eta'-mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described.
Published: 2020
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27. Search for eta '-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., Zhao, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., and Zhao, J.
Abstract: We plan a semi-exclusive measurement of the C-12(p,dp) reaction to search for eta'-mesic nuclei, aiming at investigating in-medium properties of the eta'-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce eta'-mesic C-11 nuclei via the C-12(p,d)eta'circle times C-11 reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the eta'-mesic nuclei for event selection will provide a high experimental sensitivity to observe eta'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported.
Published: 2020
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28. Search for eta '-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., Zhao, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., and Zhao, J.
Abstract: We plan a semi-exclusive measurement of the C-12(p,dp) reaction to search for eta'-mesic nuclei, aiming at investigating in-medium properties of the eta'-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce eta'-mesic C-11 nuclei via the C-12(p,d)eta'circle times C-11 reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the eta'-mesic nuclei for event selection will provide a high experimental sensitivity to observe eta'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported.
Published: 2020
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29. Search for eta '-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., Zhao, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., and Zhao, J.
Abstract: We plan a semi-exclusive measurement of the C-12(p,dp) reaction to search for eta'-mesic nuclei, aiming at investigating in-medium properties of the eta'-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce eta'-mesic C-11 nuclei via the C-12(p,d)eta'circle times C-11 reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the eta'-mesic nuclei for event selection will provide a high experimental sensitivity to observe eta'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported.
Published: 2020
Full Text: View/download PDF

30. Search for eta '-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., Zhao, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., and Zhao, J.
Abstract: We plan a semi-exclusive measurement of the C-12(p,dp) reaction to search for eta'-mesic nuclei, aiming at investigating in-medium properties of the eta'-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce eta'-mesic C-11 nuclei via the C-12(p,d)eta'circle times C-11 reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the eta'-mesic nuclei for event selection will provide a high experimental sensitivity to observe eta'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported.
Published: 2020
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31. Search for eta '-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author: Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., Zhao, J., Tanaka, Y. K., Bagchi, S., Benlliure, J., Dickel, T., Drozd, V, Ekawa, H., Fujioka, H., Geissel, H., Goldenbaum, F., Guo, C., Haettner, E., Harakeh, M. N., Hayano, R. S., Hirenzaki, S., Hornung, C., Igarashi, Y., Ikeno, N., Itahashi, K., Iwasaki, M., Jido, D., Kalantar-Nayestanaki, N., Kanungo, R., Kindler, B., Knoebel, R., Kostyleva, D., Kurz, N., Kuzminchuk, N., Lommel, B., Ma, Y., Matsumoto, S. Y., Metag, V, Minami, S., Moskal, P., Mukha, I, Nagae, T., Nagahiro, H., Nakagawa, M., Ong, H. J., Outa, H., Pietri, S., Plass, W. R., Prochazka, A., Purushothaman, S., Rappold, C., Ritman, J., Rodriguez-Sanchez, J. L., Ruber, Roger, Rundel, O., Saito, T. R., Scheidenberger, C., Sekiya, R., Serdyuk, V, Simon, H., Sitar, B., Skurzok, M., Strmen, P., Sun, B., Szarka, I, Takechi, M., Tanihata, I, Terashima, S., Weick, H., Yamamoto, A., and Zhao, J.
Abstract: We plan a semi-exclusive measurement of the C-12(p,dp) reaction to search for eta'-mesic nuclei, aiming at investigating in-medium properties of the eta'-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce eta'-mesic C-11 nuclei via the C-12(p,d)eta'circle times C-11 reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the eta'-mesic nuclei for event selection will provide a high experimental sensitivity to observe eta'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported.
Published: 2020
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32. Increased isomeric lifetime of hydrogen-like Os-192m

Author: Akber, A, Reed, MW, Walker, PM, Litvinov, YA, Lane, GJ, Kibedi, T, Blaum, K, Bosch, F, Brandau, C, Carroll, JJ, Cullen, DM, Cullen, IJ, Deo, AY, Detwiler, B, Dimopoulou, C, Dracoulis, GD, Farinon, F, Geissel, H, Haettner, E, Heil, M, Kempley, RS, Knoebel, R, Kozhuharov, C, Kurcewicz, J, Kuzminchuk, N, Litvinov, S, Liu, Z, Mao, R, Nociforo, C, Nolden, F, Plass, WR, Podolyak, Z, Prochazka, A, Scheidenberger, C, Shubina, D, Steck, M, Stoehlker, T, Sun, B, Swan, TPD, Trees, G, Weick, H, Winckler, N, Winkler, M, Woods, PJ, Yamaguchi, T, Akber, A, Reed, MW, Walker, PM, Litvinov, YA, Lane, GJ, Kibedi, T, Blaum, K, Bosch, F, Brandau, C, Carroll, JJ, Cullen, DM, Cullen, IJ, Deo, AY, Detwiler, B, Dimopoulou, C, Dracoulis, GD, Farinon, F, Geissel, H, Haettner, E, Heil, M, Kempley, RS, Knoebel, R, Kozhuharov, C, Kurcewicz, J, Kuzminchuk, N, Litvinov, S, Liu, Z, Mao, R, Nociforo, C, Nolden, F, Plass, WR, Podolyak, Z, Prochazka, A, Scheidenberger, C, Shubina, D, Steck, M, Stoehlker, T, Sun, B, Swan, TPD, Trees, G, Weick, H, Winckler, N, Winkler, M, Woods, PJ, and Yamaguchi, T
Published: 2015

33. High-precision Mass Measurements of 203-207Rn and 213Ra with SHIPTRAP

Author: Droese, C., Ackermann, D., Andersson, L. -L., Blaum, K., Block, M., Dworschak, M., Eibach, M., Eliseev, S., Forsberg, Ulrika, Haettner, E., Herfurth, F., Hessberger, F. P., Hofmann, S., Ketelaer, J., Marx, G., Ramirez, E. Minaya, Nesterenko, D., Novikov, Yu. N., Plass, W. R., Rodriguez, D., Rudolph, Dirk, Scheidenberger, C., Schweikhard, L., Stolze, S., Thirolf, P. G., Weber, C., Droese, C., Ackermann, D., Andersson, L. -L., Blaum, K., Block, M., Dworschak, M., Eibach, M., Eliseev, S., Forsberg, Ulrika, Haettner, E., Herfurth, F., Hessberger, F. P., Hofmann, S., Ketelaer, J., Marx, G., Ramirez, E. Minaya, Nesterenko, D., Novikov, Yu. N., Plass, W. R., Rodriguez, D., Rudolph, Dirk, Scheidenberger, C., Schweikhard, L., Stolze, S., Thirolf, P. G., and Weber, C.
Abstract: The masses of the nuclides Rn203-207 and Ra-213 were measured directly for the first time with the Penning-trap mass spectrometer SHIPTRAP at GSI Darmstadt. The results confirm the previously determined mass values. The mass uncertainties for Rn-205 and Ra-213 were significantly reduced. The results are relevant for the investigation of the nuclear shell structure between N = 82 and N = 126. As an indicator of structural changes the two-neutron separation energies S-2n(Z, N) have been studied.
Published: 2013

34. Technique for resolving low-lying isomers in the experimental storage ring (ESR) and the occurrence of an isomeric state in Re

Author: Reed, MW, Walker, PM, Cullen, IJ, Deo, AY, Kempley, RS, Swan, TPD, Litvinov, YA, Bosch, F, Brandau, C, Shubina, D, Winckler, N, Blaum, K, Dimopoulou, C, Farinon, F, Geissel, H, Heil, M, Knöbel, R, Kozhuharov, C, Kurcewicz, J, Kuzminchuk, N, Litvinov, S, Nociforo, C, Nolden, F, Prochazka, A, Scheidenberger, C, Steck, M, Stöhlker, T, Sun, B, Weick, H, Winkler, M, Carroll, JJ, Cullen, DM, Detwiler, B, Trees, G, Dracoulis, GD, Haettner, E, Pla, WR, Liu, Z, Woods, PJ, Mao, R, Yamaguchi, T, Reed, MW, Walker, PM, Cullen, IJ, Deo, AY, Kempley, RS, Swan, TPD, Litvinov, YA, Bosch, F, Brandau, C, Shubina, D, Winckler, N, Blaum, K, Dimopoulou, C, Farinon, F, Geissel, H, Heil, M, Knöbel, R, Kozhuharov, C, Kurcewicz, J, Kuzminchuk, N, Litvinov, S, Nociforo, C, Nolden, F, Prochazka, A, Scheidenberger, C, Steck, M, Stöhlker, T, Sun, B, Weick, H, Winkler, M, Carroll, JJ, Cullen, DM, Detwiler, B, Trees, G, Dracoulis, GD, Haettner, E, Pla, WR, Liu, Z, Woods, PJ, Mao, R, and Yamaguchi, T
Abstract: A recent experiment using projectile fragmentation of a Au beam on a Be target, combined with the fragment recoil separator and experimental storage ring at ring at GSI, has uncovered an isomeric state in Re at 267(10) keV with a half-life of ∼60 s. The data analysis technique used to resolve the isomeric state from the ground state is discussed. © Published under licence by IOP Publishing Ltd.
Published: 2012

35. Long-lived isomers in neutron-rich Z=72 76 nuclides

Author: Reed, Matthew, Walker, Philip M, Cullen, I J, Litvinov, Yu.A., Shubina, D., Dracoulis, George, Blaum, K., Bosch, F., Brandau, C., Carroll, J.J., Cullen, D M, Deo, A.Y., Detwiler, B., Dimopoulou, C., Dong, G.X., Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z., Mao, R., Nociforo, C., Nolden, F., Plass, W.R., Podolyak, Zs., Prochazka, A., Scheidenberger, C., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., Xu, F R, Yamaguchi, T., Shubina, D, Reed, Matthew, Walker, Philip M, Cullen, I J, Litvinov, Yu.A., Shubina, D., Dracoulis, George, Blaum, K., Bosch, F., Brandau, C., Carroll, J.J., Cullen, D M, Deo, A.Y., Detwiler, B., Dimopoulou, C., Dong, G.X., Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z., Mao, R., Nociforo, C., Nolden, F., Plass, W.R., Podolyak, Zs., Prochazka, A., Scheidenberger, C., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., Xu, F R, Yamaguchi, T., and Shubina, D
Abstract: A study of neutron-rich isotopes in the A=185 region of the nuclear chart has uncovered long-lived (>1s) isomers in several isotopes of hafnium, tantalum, tungsten, rhenium, and osmium. The region was accessed via the use of projectile fragmentation with
Published: 2012

36. Technique for Resolving Low-lying Isomers in the Experimental Storage Ring (ESR) and the Occurrence of an Isomeric State in 192Re

Author: Reed, Matthew, Walker, Philip M, Cullen, I J, Litvinov, Yu.A., Blaum, K., Bosch, F., Brandau, C., Carroll, J.J., Cullen, D M, Deo, A.Y., Detwiler, B., Dimopoulou, C., Dracoulis, George, Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z, Mao, R., Nociforo, C., Nolden, F., Plass, W.R., Prochazka, A., Scheidenberger, C., Shubina, D., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., Yamaguchi, T., Reed, Matthew, Walker, Philip M, Cullen, I J, Litvinov, Yu.A., Blaum, K., Bosch, F., Brandau, C., Carroll, J.J., Cullen, D M, Deo, A.Y., Detwiler, B., Dimopoulou, C., Dracoulis, George, Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z, Mao, R., Nociforo, C., Nolden, F., Plass, W.R., Prochazka, A., Scheidenberger, C., Shubina, D., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., and Yamaguchi, T.
Abstract: A recent experiment using projectile fragmentation of a 197Au beam on a 9Be target, combined with the fragment recoil separator and experimental storage ring at ring at GSI, has uncovered an isomeric state in 192Re at 267(10) keV with a half-life of ∼60
Published: 2012

37. Discovery of Highly Excited Long-Lived Isomers in Neutron-Rich Hafnium and Tantalum Isotopes through Direct Mass Measurements

Author: Reed, M.W., Cullen, I J, Walker, Philip M, Litvinov, Yu.A., Blaum, K., Bosch, F., Brandau, C., Carroll, J., Cullen, D M, Deo, A.Y., Detwiller, B., Dimopoulou, C., Dracoulis, George, Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z., Mao, Rui-Shi, Nociforo, C., Nolden, F., Plass, W.R., Prochazka, A., Scheidenberger, C., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., Yamaguchi, T., Reed, M.W., Cullen, I J, Walker, Philip M, Litvinov, Yu.A., Blaum, K., Bosch, F., Brandau, C., Carroll, J., Cullen, D M, Deo, A.Y., Detwiller, B., Dimopoulou, C., Dracoulis, George, Farinon, F., Geissel, H., Haettner, E., Heil, M., Kempley, R.S., Knobel, R., Kozhuharov, C., Kurcewicz, J., Kuzminchuk, N., Litvinov, S., Liu, Z., Mao, Rui-Shi, Nociforo, C., Nolden, F., Plass, W.R., Prochazka, A., Scheidenberger, C., Steck, M., Stohlker, Th., Sun, B., Swan, T.P.D., Trees, G., Weick, H., Winckler, N., Winkler, M., Woods, P.J., and Yamaguchi, T.
Abstract: A study of cooled Au197 projectile-fragmentation products has been performed with a storage ring. This has enabled metastable nuclear excitations with energies up to 3 MeV, and half-lives extending to minutes or longer, to be identified in the neutron-rich nuclides Hf183,184,186 and Ta186,187. The results support the prediction of a strongly favored isomer region near neutron number 116.
Published: 2010

38. Observation of Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like $^{140}$Pr and $^{142}$Pm Ions

Author: Litvinov, Yu. A., Bosch, F., Winckler, N., Boutin, D., Essel, H. G., Faestermann, T., Geissel, H., Hess, S., Kienle, P., Knöbel, R., Kozhuharov, C., Kurcewicz, J., Maier, L., Beckert, K., Beller, P., Brandau, C., Chen, L., Dimopoulou, C., Fabian, B., Fragner, A., Haettner, E., Hausmann, M., Litvinov, S. A., Mazzocco, M., Montes, F., Musumarra, A., Nociforo, C., Nolden, F., Plaß, W., Prochazka, A., Reda, R., Reuschl, R., Scheidenberger, C., Steck, M., Stöhlker, T., Torilov, S., Trassinelli, M., Sun, B., Weick, H., Winkler, M., Litvinov, Yu. A., Bosch, F., Winckler, N., Boutin, D., Essel, H. G., Faestermann, T., Geissel, H., Hess, S., Kienle, P., Knöbel, R., Kozhuharov, C., Kurcewicz, J., Maier, L., Beckert, K., Beller, P., Brandau, C., Chen, L., Dimopoulou, C., Fabian, B., Fragner, A., Haettner, E., Hausmann, M., Litvinov, S. A., Mazzocco, M., Montes, F., Musumarra, A., Nociforo, C., Nolden, F., Plaß, W., Prochazka, A., Reda, R., Reuschl, R., Scheidenberger, C., Steck, M., Stöhlker, T., Torilov, S., Trassinelli, M., Sun, B., Weick, H., and Winkler, M.
Abstract: We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like $^{140}$Pr$^{59+}$ and $^{142}$Pm$^{60+}$ ions coasting in an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass spectrometry we found that the expected exponential decay is modulated in time with a modulation period of about 7 seconds for both systems. Tentatively this observation is attributed to the coherent superposition of finite mass eigenstates of the electron neutrinos from the weak decay into a two-body final state., Comment: 12 pages, 5 figures
Published: 2008
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39. Experimental fragmentation studies with (12)C therapy beams

Author: Haettner, E., Iwase, H., Schardt, D., Haettner, E., Iwase, H., and Schardt, D.
Abstract: High-energy beams of (12)C ions in the range of 80-430 MeV u(-1) delivered by the heavy-ion synchrotron SIS-18 are used for radiotherapy of deep-seated localized tumors at the treatment unit at GSI Darmstadt. In order to improve the physical database, the fragmentation characteristics along the penetration path in tissue were investigated experimentally by using a water phantom as tissue-equivalent absorber. Measurements were performed at specific energies of 200 and 400 MeV u(-1) of the incident (12)C ions and at six different depths before and behind the Bragg peak. Secondary fragments with nuclear charges Z(f) = 1-5 were identified by scintillation detectors using AE-E and time-of-flight techniques. The preliminary results include energy- and angular distributions, fragment yields, build-up curves and attenuation of the primary carbon projectiles., QC 20110929. Conference: 14th International Symposium on Microdosimetry. Venice, ITALY. NOV 13-18, 2005
Published: 2006
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40. Four Swedish cases with Homozygoty for the FAP-MET30-gene

Author: Holmgren, G, Drugge, Ulf, Haettner, E, Lundgren, E, Sandgren, O, Steen, L, Wahlqvist, J, Holmgren, G, Drugge, Ulf, Haettner, E, Lundgren, E, Sandgren, O, Steen, L, and Wahlqvist, J
Published: 1990

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