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10 results on '"Korten, Wolfram"'

1. Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Author

Singh, Purnima, Korten, Wolfram, Hagen, T. W., Gorgen, Andreas, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Clement, Emmanuel, de France, Gilles, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Delaune, Olivier, Dewald, Alfred, Dijon, A., Delaroche, Jean Paul, Girod, Michel, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Gottardo, Andrea, Michelagnoli, Caterina, Muller-Gatermann, C, Napoli, Daniel R., Otsuka, Takaharu, Pillet, Nathalie, Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Togashi, Tomoaki, Tsunoda, Yuhsuke, Theisen, Christophe, Valiente-Dobon, Jose Javier, Singh, Purnima, Korten, Wolfram, Hagen, T. W., Gorgen, Andreas, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Clement, Emmanuel, de France, Gilles, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Delaune, Olivier, Dewald, Alfred, Dijon, A., Delaroche, Jean Paul, Girod, Michel, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Gottardo, Andrea, Michelagnoli, Caterina, Muller-Gatermann, C, Napoli, Daniel R., Otsuka, Takaharu, Pillet, Nathalie, Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Togashi, Tomoaki, Tsunoda, Yuhsuke, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

The lifetimes of the first excited 2+, 4+, and 6+ states in Zr98 were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in Zr98 were populated using the fission reaction between a 6.2 MeV/u U238 beam and a Be9 target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;21+→01+) value in Zr98, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. © 2018 American Physical Society.

Published
2018

2. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of excited states in Tc-107, Rh-109, Rh-111, and Rh-113 were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a U-238 beam impinging on a Be-9 target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt gamma rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positiveparity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in Tc-107 and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

Published
2018

3. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of excited states in Tc-107, Rh-109, Rh-111, and Rh-113 were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a U-238 beam impinging on a Be-9 target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt gamma rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positiveparity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in Tc-107 and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

Published
2018

4. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of excited states in Tc-107, Rh-109, Rh-111, and Rh-113 were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a U-238 beam impinging on a Be-9 target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt gamma rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positiveparity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in Tc-107 and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

Published
2018

5. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author

Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of excited states in Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National dIons Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N GT = 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.

Published
2017

6. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author

Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of excited states in Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National dIons Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N GT = 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.

Published
2017

7. Lifetime Measurments of Excited States in Neutron-Rich Fission Fragments

Author

Hagen, T. W., Grente, Lucie, Gorgen, Andreas, Salsac, Marie Delphine, Korten, Wolfram, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Grente, Lucie, Gorgen, Andreas, Salsac, Marie Delphine, Korten, Wolfram, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments were measured using the recoil distance Doppler shift (RDDS) technique, which was applied to fusion-fission reactions in inverse kinematics for the first time. The fission fragments were identified event-by-event in mass, charge, and atomic number using the VAMOS magnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were measured with the EXOGAM array of Ge Clover detectors around the target position. Using a degrader, the change in the Doppler shift of the gamma ray allows the application of the RDDS method. Details of the experimental technique will be discussed and the status for the ongoing analysis for odd-mass yttrium isotopes will be presented.

Published
2016

8. Lifetime Measurments of Excited States in Neutron-Rich Fission Fragments

Author

Hagen, T. W., Grente, Lucie, Gorgen, Andreas, Salsac, Marie Delphine, Korten, Wolfram, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Grente, Lucie, Gorgen, Andreas, Salsac, Marie Delphine, Korten, Wolfram, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Abstract

Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments were measured using the recoil distance Doppler shift (RDDS) technique, which was applied to fusion-fission reactions in inverse kinematics for the first time. The fission fragments were identified event-by-event in mass, charge, and atomic number using the VAMOS magnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were measured with the EXOGAM array of Ge Clover detectors around the target position. Using a degrader, the change in the Doppler shift of the gamma ray allows the application of the RDDS method. Details of the experimental technique will be discussed and the status for the ongoing analysis for odd-mass yttrium isotopes will be presented.

Published
2016

9. Lifetime measurements on fission fragments in the A similar to 100 region

Author

Grente, Lucie, Salsac, Marie Delphine, Korten, Wolfram, Görgen, Andreas, Hagen, T. W., Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, Delaune, Olivier, Dijon, A., Drouart, A., Ertuerk, S., Farget, Fanny, de France, Gilles, Gottardo, Andrea, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Pillet, Nathalie, Pipidis, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Schmitt, C., Siem, Sunniva, Sulignano, Barbara, Valiente-Dobon, Jose Javier, Zell, K. O., Grente, Lucie, Salsac, Marie Delphine, Korten, Wolfram, Görgen, Andreas, Hagen, T. W., Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, Delaune, Olivier, Dijon, A., Drouart, A., Ertuerk, S., Farget, Fanny, de France, Gilles, Gottardo, Andrea, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Pillet, Nathalie, Pipidis, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Schmitt, C., Siem, Sunniva, Sulignano, Barbara, Valiente-Dobon, Jose Javier, and Zell, K. O.

Abstract

Lifetimes of first 4(+) and 6(+) states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and gamma -rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1-100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013

10. Lifetime measurements on fission fragments in the A similar to 100 region

Author

Grente, Lucie, Salsac, Marie Delphine, Korten, Wolfram, Görgen, Andreas, Hagen, T. W., Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, Delaune, Olivier, Dijon, A., Drouart, A., Ertuerk, S., Farget, Fanny, de France, Gilles, Gottardo, Andrea, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Pillet, Nathalie, Pipidis, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Schmitt, C., Siem, Sunniva, Sulignano, Barbara, Valiente-Dobon, Jose Javier, Zell, K. O., Grente, Lucie, Salsac, Marie Delphine, Korten, Wolfram, Görgen, Andreas, Hagen, T. W., Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, Delaune, Olivier, Dijon, A., Drouart, A., Ertuerk, S., Farget, Fanny, de France, Gilles, Gottardo, Andrea, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Navin, A., Pillet, Nathalie, Pipidis, A., Recchia, Francesco, Rejmund, M., Rother, Wolfram, Sahin, Eda, Schmitt, C., Siem, Sunniva, Sulignano, Barbara, Valiente-Dobon, Jose Javier, and Zell, K. O.

Abstract

Lifetimes of first 4(+) and 6(+) states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and gamma -rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1-100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013

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