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18 results on '"Söderström, Pär-Anders"'

1. Towards The Determination Of Superdeformation In Ca-42

Author

Hadynska-Klek, K., Napiorkowski, P. J., Maj, A., Azaiez, F., Kicinska-Habior, M., Valiente-Dobon, J. J., de Angelis, G., Abraham, T., Kumar, G. Anil, Arnes, B. -Q, Bazzacco, D., Bellato, M., Bortolato, D., Bednarczyk, P., Benzoni, G., Berti, L., Birkenbach, B., Bruyneel, B., Brambilla, S., Camera, F., Chavas, J., Ciemala, M., Cocconi, P., Coleman-Smith, P., Colombo, A., Corsi, A., Crespi, F. C. L., Cullen, D. M., Czermak, A., Desesquelles, P., Dulny, B., Eberth, J., Farnea, E., Fornal, B., Franchoo, S., Gadea, A., Giaz, A., Gottardo, A., Grave, X., Grebosz, J., Gulmini, M., Habermann, T., Isocrate, R., Iwanicki, J., Jaworski, G., Jungclaus, A., Karkour, N., Kmiecik, M., Karpinski, D., Kisielinski, M., Kondratyev, N., Korichi, A., Komorowska, M., Kowalczyk, M., Korten, W., Krzysiek, M., Lehaut, G., Leoni, S., Lopez-Martens, A., Lunardi, S., Maron, G., Mazurek, K., Menegazzo, R., Mengoni, D., Merchan, E., Meczynski, W., Michelagnoli, C., Mierzejewski, J., Million, B., Molini, P., Myalski, S., Napoli, D. R., Nicolini, R., Niikura, M., Obertelli, A., Ozmen, S. F., Palacz, M., Pullia, A., Rampazzo, G., Recchia, F., Redon, N., Reiter, P., Rosso, D., Rusek, K., Sahin, E., Salsac, M. -D, Söderström, Pär-Anders, Srebrny, J., Stefan, I., Stezowski, O., Styczen, J., Theisen, Ch, Toniolo, N., Ur, C. A., Vandone, V., Wadsworthy, R., Wasilewska, B., Wiens, A., Wrzosek-Lipska, K., Zielinska, M., Zieblinski, M., Hadynska-Klek, K., Napiorkowski, P. J., Maj, A., Azaiez, F., Kicinska-Habior, M., Valiente-Dobon, J. J., de Angelis, G., Abraham, T., Kumar, G. Anil, Arnes, B. -Q, Bazzacco, D., Bellato, M., Bortolato, D., Bednarczyk, P., Benzoni, G., Berti, L., Birkenbach, B., Bruyneel, B., Brambilla, S., Camera, F., Chavas, J., Ciemala, M., Cocconi, P., Coleman-Smith, P., Colombo, A., Corsi, A., Crespi, F. C. L., Cullen, D. M., Czermak, A., Desesquelles, P., Dulny, B., Eberth, J., Farnea, E., Fornal, B., Franchoo, S., Gadea, A., Giaz, A., Gottardo, A., Grave, X., Grebosz, J., Gulmini, M., Habermann, T., Isocrate, R., Iwanicki, J., Jaworski, G., Jungclaus, A., Karkour, N., Kmiecik, M., Karpinski, D., Kisielinski, M., Kondratyev, N., Korichi, A., Komorowska, M., Kowalczyk, M., Korten, W., Krzysiek, M., Lehaut, G., Leoni, S., Lopez-Martens, A., Lunardi, S., Maron, G., Mazurek, K., Menegazzo, R., Mengoni, D., Merchan, E., Meczynski, W., Michelagnoli, C., Mierzejewski, J., Million, B., Molini, P., Myalski, S., Napoli, D. R., Nicolini, R., Niikura, M., Obertelli, A., Ozmen, S. F., Palacz, M., Pullia, A., Rampazzo, G., Recchia, F., Redon, N., Reiter, P., Rosso, D., Rusek, K., Sahin, E., Salsac, M. -D, Söderström, Pär-Anders, Srebrny, J., Stefan, I., Stezowski, O., Styczen, J., Theisen, Ch, Toniolo, N., Ur, C. A., Vandone, V., Wadsworthy, R., Wasilewska, B., Wiens, A., Wrzosek-Lipska, K., Zielinska, M., and Zieblinski, M.

Abstract

The Coulomb excitation experiment to study electromagnetic structure of low-lying states in Ca-42 with a focus on a possible superdeformation in this nucleus was performed at the Laboratori Nazionali di Legnaro in Italy. Preliminary values of the determined quadrupole deformation parameters for both the ground state band and the presumed superdeformed band are presented.

Published
2013
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2. Monte Carlo simulation of a single detector unit for the neutron detector array NEDA

Author

Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., Dobon, J.J. Valiente, Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., and Dobon, J.J. Valiente

Abstract

A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501

Published
2012
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3. Influence of the np interaction on the beta decay of Pd-94

Author

Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., and Nowacki, F.

Abstract

We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of gamma-ray transitions following the beta decay of Pd-94. A comparison between the measured low-lying level scheme of Rh-94 and the prediction from shell-model calculations reveals the important roles of the g(7/2) and g(9/2) orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that Pd-94 resides in the middle of a structural transition region in the Pd isotopes as the N = Z line is approached.

Published
2012
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4. Nuclear deformations in the region of the A=160 r-process abundance peak

Author

Söderström, Pär-Anders and Söderström, Pär-Anders

Abstract

In the abundance spectrum of r-process nuclei the most prominent features are the peaks that form when the r-process flow passes through the closed neutron shells. However, there are also other features in the abundance spectrum that cannot be explained by shell effects; for example, the peak in the region of the rare-earth nuclei around mass A = 160. It has been argued that this peak is related to the deformation maximum of the neutron-rich isotopes. In recent years, both experimental and theoretical work has been carried out to study the deformation of neutron-rich rare-earth nuclei and to search for the point of maximum deformation. This work has focused on the nuclei around Dy-170 with the aim of understanding the evolution of collectivity in the neutron shell with 82 < N < 126. These investigations will be discussed in terms of the Harris parameters of the variable moment of inertia model. Finally, we will discuss the possibility of reaching further into the neutron-rich rare-earth region in the future at the new experimental facilities using radioactive beams.

Published
2012
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5. Monte Carlo simulation of a single detector unit for the neutron detector array NEDA

Author

Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., Dobon, J.J. Valiente, Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., and Dobon, J.J. Valiente

Abstract

A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501

Published
2012
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6. Influence of the np interaction on the beta decay of Pd-94

Author

Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., and Nowacki, F.

Abstract

We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of gamma-ray transitions following the beta decay of Pd-94. A comparison between the measured low-lying level scheme of Rh-94 and the prediction from shell-model calculations reveals the important roles of the g(7/2) and g(9/2) orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that Pd-94 resides in the middle of a structural transition region in the Pd isotopes as the N = Z line is approached.

Published
2012
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7. Monte Carlo simulation of a single detector unit for the neutron detector array NEDA

Author

Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., Dobon, J.J. Valiente, Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., and Dobon, J.J. Valiente

Abstract

A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501

Published
2012
Full Text
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8. Influence of the np interaction on the beta decay of Pd-94

Author

Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., and Nowacki, F.

Abstract

We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of gamma-ray transitions following the beta decay of Pd-94. A comparison between the measured low-lying level scheme of Rh-94 and the prediction from shell-model calculations reveals the important roles of the g(7/2) and g(9/2) orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that Pd-94 resides in the middle of a structural transition region in the Pd isotopes as the N = Z line is approached.

Published
2012
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9. Monte Carlo simulation of a single detector unit for the neutron detector array NEDA

Author

Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., Dobon, J.J. Valiente, Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., and Dobon, J.J. Valiente

Abstract

A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501

Published
2012
Full Text
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10. Influence of the np interaction on the beta decay of Pd-94

Author

Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., and Nowacki, F.

Abstract

We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of gamma-ray transitions following the beta decay of Pd-94. A comparison between the measured low-lying level scheme of Rh-94 and the prediction from shell-model calculations reveals the important roles of the g(7/2) and g(9/2) orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that Pd-94 resides in the middle of a structural transition region in the Pd isotopes as the N = Z line is approached.

Published
2012
Full Text
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11. Monte Carlo simulation of a single detector unit for the neutron detector array NEDA

Author

Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., Dobon, J.J. Valiente, Jaworski, G., Palacz, M., Nyberg, Johan, Angelis, G. de, France, G. de, Nitto, A. Di, Egea, J., Erduran, M. N., Ertürk, S., Farnea, E., Gadea, A., González, V., Gottardo, A., Hüyük, T., Kownacki, J., Pipidis, A., Roeder, B., Söderström, Pär-Anders, Sanchis, E., Tarnowski, R., Triossi, A., Wadsworth, R., and Dobon, J.J. Valiente

Abstract

A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501

Published
2012
Full Text
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12. Influence of the np interaction on the beta decay of Pd-94

Author

Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., Singh, B. S. Nara, Brock, T. S., Wadsworth, R., Grawe, H., Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., and Nowacki, F.

Abstract

We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of gamma-ray transitions following the beta decay of Pd-94. A comparison between the measured low-lying level scheme of Rh-94 and the prediction from shell-model calculations reveals the important roles of the g(7/2) and g(9/2) orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that Pd-94 resides in the middle of a structural transition region in the Pd isotopes as the N = Z line is approached.

Published
2012
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13. Electromagnetic properties of vibrational bands in Er-170

Author

DiJulio, D. D., Cederkall, J., Fahlander, C., Ekström, A., Golubev, P., Mattsson, K., Rudolph, D., de Angelis, G., Aydin, S., Deo, A. Y., Farnea, E., Farrelly, G., Geibel, K., He, C., Iwanicki, J., Kempley, R., Marginean, N., Menegazzo, R., Mengoni, D., Orlandi, R., Podolyak, Z., Recchia, F., Reiter, P., Sahin, E., Smith, J., Söderström, Pär-Anders, Torres, D. A., Tveten, G. M., Ur, C. A., Valiente-Dobon, J. J., Wendt, A., Zielinska, M., DiJulio, D. D., Cederkall, J., Fahlander, C., Ekström, A., Golubev, P., Mattsson, K., Rudolph, D., de Angelis, G., Aydin, S., Deo, A. Y., Farnea, E., Farrelly, G., Geibel, K., He, C., Iwanicki, J., Kempley, R., Marginean, N., Menegazzo, R., Mengoni, D., Orlandi, R., Podolyak, Z., Recchia, F., Reiter, P., Sahin, E., Smith, J., Söderström, Pär-Anders, Torres, D. A., Tveten, G. M., Ur, C. A., Valiente-Dobon, J. J., Wendt, A., and Zielinska, M.

Abstract

Excited states of the nucleus Er-170 have been studied by Coulomb excitation using the GASP gamma-ray detector system at the Laboratori Nazionali di Legnaro. The ground-state band along with a low-lying K-pi = 0(+) band and gamma-vibrational band were populated during the experiment. Based on the measured gamma-ray yields, a set of interband and intraband matrix elements has been extracted using the Coulomb excitation code GOSIA. The resulting E2 matrix elements are compared to collective model predictions.

Published
2011
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14. Observation of a new high-spin isomer in Pd-94

Author

Brock, T. S., Singh, B. S. Nara, Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Wadsworth, R., Gorska, M., Grawe, H., Pietri, S., Domingo-Pardo, C., Rudolph, D., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Eppinger, K., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojuharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs, Regan, P. H., Reiter, P., Rinta-Antila, S., Schaffner, H., Scholl, C., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Brock, T. S., Singh, B. S. Nara, Boutachkov, P., Braun, N., Blazhev, A., Liu, Z., Wadsworth, R., Gorska, M., Grawe, H., Pietri, S., Domingo-Pardo, C., Rudolph, D., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Engert, T., Eppinger, K., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojuharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs, Regan, P. H., Reiter, P., Rinta-Antila, S., Schaffner, H., Scholl, C., Söderström, Pär-Anders, Warr, N., Weick, H., Wollersheim, H. -J, and Woods, P. J.

Abstract

A second gamma-decaying high-spin isomeric state, with a half-life of 197(22) ns, has been identified in the N = Z + 2 nuclide Pd-94 as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of 19(-), corresponding to the maximum possible spin of a negative parity state in the restricted (p(1/2), g(9/2)) model space of empirical shell model calculations. The reproduction of the E3 decay properties of the isomer required an extension of the model space to include the f (5/2) and p(3/2) orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of Sn-100 and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the E3 decay, the dominant configuration for the 19(-) state remains (p p(1/2)(-1)g(9/2)(-3))(11)circle times(nu g(9/2)(-2))(8). The half-life of the known, 14(+), isomer was remeasured and yielded a value of 499(13) ns.

Published
2010
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15. AGATA: Gamma-ray tracking in segmented HPGedetectors

Author

Söderström, Pär-Anders, Al-Adili, Ali, Nyberg, Johan, Recchia, Francesco, Farnea, Enrico, Gadea, Andres, Söderström, Pär-Anders, Al-Adili, Ali, Nyberg, Johan, Recchia, Francesco, Farnea, Enrico, and Gadea, Andres

Published
2009

16. First in-Beam Commissioning Experiment of AGATA

Author

Gadea, Andres, Nyberg, Johan, Recchia, Francesco, Söderström, Pär-Anders, Ataç, Ayşe, Aydin, S, Bazzacco, Dino, Bednarczyk, P, Bortolato, D, Boston, A. J., Boston, H. C., Bruyneel, B, Bucurescu, D, Calore, E, Colosimo, S, Crespi, F. C. L., Dosme, N, Farnea, Enrico, Filmer, Fay, Gottardo, Andrea, Gulmini, M, Jaworski, Grzegorz, Joshi, P, Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Mengoni, D, Michelagnoli, C, Molini, P, Napoli, D. R., Sahin, Eda, Smith, J. F., Tonev, D, Unsworth, Carl, Ur, C. A., Wiens, A, Gadea, Andres, Nyberg, Johan, Recchia, Francesco, Söderström, Pär-Anders, Ataç, Ayşe, Aydin, S, Bazzacco, Dino, Bednarczyk, P, Bortolato, D, Boston, A. J., Boston, H. C., Bruyneel, B, Bucurescu, D, Calore, E, Colosimo, S, Crespi, F. C. L., Dosme, N, Farnea, Enrico, Filmer, Fay, Gottardo, Andrea, Gulmini, M, Jaworski, Grzegorz, Joshi, P, Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Mengoni, D, Michelagnoli, C, Molini, P, Napoli, D. R., Sahin, Eda, Smith, J. F., Tonev, D, Unsworth, Carl, Ur, C. A., and Wiens, A

Published
2009

17. Detection of fast neutrons and digital pulse-shape discrimination between neutrons and gamma-rays

Author

Söderström, Pär-Anders and Söderström, Pär-Anders

Abstract

The basic principles of detection of fast neutrons with liquid scintillator detectors are reviewed, together with a real example in the form of the Neutron Wall array. Two of the challenges in neutron detection, discrimination of neutrons and gamma rays and identification of cross talk between detectors due to neutron scattering, are briefly discussed, as well as possible solutions to these problems. The possibilities of using digital techniques for pulse-shape discrimination are examined. Results from a digital and analog versions of the zero cross-over algorithm are presented. The digital pulse-shape discrimination is shown to give, at least, as good results as the corresponding analogue version.

Published
2008

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