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Your search keyword '"Paulsen, W"' showing total 9 results
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9 results on '"Paulsen, W"'

1. Nuclear level densities and ?-ray strength functions in 120,124Sn isotopes: Impact of Porter-Thomas fluctuations

Author

Markova, M., Larsen, A. C., Von Neumann-Cosel, P., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., Wiedeking, M., Markova, M., Larsen, A. C., Von Neumann-Cosel, P., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., and Wiedeking, M.

Abstract

Nuclear level densities (NLDs) and gamma -ray strength functions (GSFs) of 120,124Sn have been extracted with the Oslo method from proton-gamma coincidences in the (p, p'gamma ) reaction. The functional forms of the GSFs and NLDs have been further constrained with the Shape method by studying primary gamma -transitions to the ground and first excited states. The NLDs demonstrate good agreement with the NLDs of 116,118,122Sn isotopes measured previously. Moreover, the extracted partial NLD of 1- levels in 124Sn is shown to be in fair agreement with those deduced from spectra of relativistic Coulomb excitation in forward-angle inelastic proton scattering. The experimental NLDs have been applied to estimate the magnitude of the Porter-Thomas (PT) fluctuations. Within the PT fluctuations, we conclude that the GSFs for both isotopes can be considered to be independent of initial and final excitation energies, in accordance with the generalized Brink-Axel hypothesis. Particularly large fluctuations observed in the Shape-method GSFs present a considerable contribution to the uncertainty of the method and may be one of the reasons for deviations from the Oslo-method strength at low gamma -ray energies and low values of the NLD (below eta 1 x 103-2 x 103 MeV-1).

Published
2022

2. Spectroscopy and lifetime measurements in Te-134,Te-136,Te-138 isotopes and implications for the nuclear structure beyond N=82

Author

Hafner, G., Lozeva, R., Naiedja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Jolie, J., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Ljungvall, J., Lopez-Martens, A., Matea, I, Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., Ziliani, S., Hafner, G., Lozeva, R., Naiedja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Jolie, J., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Ljungvall, J., Lopez-Martens, A., Matea, I, Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., and Ziliani, S.

Abstract

We report on spectroscopic information and lifetime measurements of even-even neutron-rich Te isotopes. Excited states were populated in fast-neutron induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid.-ball spectrometer. We provide first results on lifetimes of the 6(1)(+) state in Te-136 and the (6(1)(+)), (4(1)(+)), and (2(1)(+)) states in Te-138 and discuss the results in the context of large-scale shell-model calculations. The level schemes of Te-136 and Te-138 are revised in terms of lifetimes of their 2(1)(+), 4(1)(+) states and updated information on the (4(2)(+)) state in Te-136 is presented. In addition, previously reported data on spectroscopy and lifetimes in Te-134 are reexamined. This work provides new insights into the evolution of collectivity for Te isotopes with N = 82, 84, 86.

Published
2021

3. First lifetime investigations of N > 82 iodine isotopes: The quest for collectivity

Author

Haefner, G., Lozeva, R., Naidja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa-Silkowska, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., Ziliani, S., Haefner, G., Lozeva, R., Naidja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa-Silkowska, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., and Ziliani, S.

Abstract

We report on spectroscopic information and lifetime measurements in the neutron-rich I-135,I-137,I-139 isotopes. This is the first lifetime data on iodine isotopes beyond N = 82. Excited states were populated in fast neutron-induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid nu-ball spectrometer. The level schemes of the I-135,I-137,I-139 isotopes are revised in terms of excited states with up to maximum spin-parity of (33/2(+)), populated for the first time in fast neutron-induced fission. We provide first results on the lifetimes of the (9/2(1)(+)) and (13/2(1)(+)) states in I-137 and I-139, and the (17/2(1)(+)) state in 137I. In addition, we give upper lifetime limits for the (11/2(1)(+)) states in I135-139, the (15/2(1)(+)) state in I-137, the (17/2(1)(+)) state in I-139, and reexamine the (29/2(1)(+)) state in I-137. The isomeric data in I-13(5) are reinvestigated, such as the previously known (15/2(1)(+)) and (23/21) isomers with T-1/2 of 1.64(14) and 4.6(7) ns, respectively, as obtained in this work. The new spectroscopic information is compared to that from spontaneous or thermal-neutron induced fission and discussed in the context of large scale shell-model (LSSM) calculations for the region beyond Sn-132, indicating the behavior of collectivity for the three valence-proton iodine chain with N = 82, 84, 86.

Published
2021

4. Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance

Author

Markova, M., Von Neumann-Cosel, P., Larsen, A. C., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Dahl-Jacobsen, T., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., Wiedeking, M., Zeiser, F., Markova, M., Von Neumann-Cosel, P., Larsen, A. C., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Dahl-Jacobsen, T., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., Wiedeking, M., and Zeiser, F.

Abstract

The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for 116,120,124Sn below the neutron separation energy by means of three independent experimental methods. The gamma-ray strength functions (GSFs) extracted from primary gamma-decay spectra following charged-particle reactions with the Oslo method and with the shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies. In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states. The results provide a critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.

Published
2021

5. First lifetime investigations of N > 82 iodine isotopes: The quest for collectivity

Author

Haefner, G., Lozeva, R., Naidja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa-Silkowska, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., Ziliani, S., Haefner, G., Lozeva, R., Naidja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa-Silkowska, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., and Ziliani, S.

Abstract

We report on spectroscopic information and lifetime measurements in the neutron-rich I-135,I-137,I-139 isotopes. This is the first lifetime data on iodine isotopes beyond N = 82. Excited states were populated in fast neutron-induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid nu-ball spectrometer. The level schemes of the I-135,I-137,I-139 isotopes are revised in terms of excited states with up to maximum spin-parity of (33/2(+)), populated for the first time in fast neutron-induced fission. We provide first results on the lifetimes of the (9/2(1)(+)) and (13/2(1)(+)) states in I-137 and I-139, and the (17/2(1)(+)) state in 137I. In addition, we give upper lifetime limits for the (11/2(1)(+)) states in I135-139, the (15/2(1)(+)) state in I-137, the (17/2(1)(+)) state in I-139, and reexamine the (29/2(1)(+)) state in I-137. The isomeric data in I-13(5) are reinvestigated, such as the previously known (15/2(1)(+)) and (23/21) isomers with T-1/2 of 1.64(14) and 4.6(7) ns, respectively, as obtained in this work. The new spectroscopic information is compared to that from spontaneous or thermal-neutron induced fission and discussed in the context of large scale shell-model (LSSM) calculations for the region beyond Sn-132, indicating the behavior of collectivity for the three valence-proton iodine chain with N = 82, 84, 86.

Published
2021

6. Spectroscopy and lifetime measurements in Te-134,Te-136,Te-138 isotopes and implications for the nuclear structure beyond N=82

Author

Hafner, G., Lozeva, R., Naiedja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Jolie, J., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Ljungvall, J., Lopez-Martens, A., Matea, I, Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., Ziliani, S., Hafner, G., Lozeva, R., Naiedja, H., Lebois, M., Jovancevic, N., Thisse, D., Etasse, D., Canavan, R. L., Rudigier, M., Wilson, J. N., Adamska, E., Adsley, P., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Blazhev, A., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Collins, S. M., Cortes, M. L., Davies, P. J., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gerst, R-B, Gjestvang, D., Guadilla, V, Hauschild, K., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Jazwari, S., Jolie, J., Korgul, A., Koseoglou, P., Kroell, Th, Kurtukian-Nieto, T., Le-meur, L., Ljungvall, J., Lopez-Martens, A., Matea, I, Matthieu, L., Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Tello, D. Reygadas, Rezynkina, K., Sanchez, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Warr, N., Wasilewska, B., Wiederhold, J., Yavahchova, M. S., Zeiser, F., and Ziliani, S.

Abstract

We report on spectroscopic information and lifetime measurements of even-even neutron-rich Te isotopes. Excited states were populated in fast-neutron induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid.-ball spectrometer. We provide first results on lifetimes of the 6(1)(+) state in Te-136 and the (6(1)(+)), (4(1)(+)), and (2(1)(+)) states in Te-138 and discuss the results in the context of large-scale shell-model calculations. The level schemes of Te-136 and Te-138 are revised in terms of lifetimes of their 2(1)(+), 4(1)(+) states and updated information on the (4(2)(+)) state in Te-136 is presented. In addition, previously reported data on spectroscopy and lifetimes in Te-134 are reexamined. This work provides new insights into the evolution of collectivity for Te isotopes with N = 82, 84, 86.

Published
2021

7. Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance

Author

Markova, M., Von Neumann-Cosel, P., Larsen, A. C., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Dahl-Jacobsen, T., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., Wiedeking, M., Zeiser, F., Markova, M., Von Neumann-Cosel, P., Larsen, A. C., Bassauer, S., Goergen, A., Guttormsen, M., Garrote, F. L. Bello, Berg, H. C., Bjoroen, M. M., Dahl-Jacobsen, T., Eriksen, T. K., Gjestvang, D., Isaak, J., Mbabane, M., Paulsen, W., Pedersen, L. G., Pettersen, N. I. J., Richter, A., Sahin, E., Scholz, P., Siem, S., Tveten, G. M., Valsdottir, V. M., Wiedeking, M., and Zeiser, F.

Abstract

The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for 116,120,124Sn below the neutron separation energy by means of three independent experimental methods. The gamma-ray strength functions (GSFs) extracted from primary gamma-decay spectra following charged-particle reactions with the Oslo method and with the shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies. In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states. The results provide a critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.

Published
2021

8. Prompt and delayed gamma spectroscopy of neutron-rich Kr-94 and observation of a new isomer

Author

Gerst, R-B, Blazhev, A., Warr, N., Wilson, J. N., Lebois, M., Jovancevic, N., Thisse, D., Canavan, R., Rudigier, M., Etasse, D., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Courtin, S., Cortes, M. L., Davies, P., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gjestvang, D., Gottardo, A., Guadilla, V, Haefner, G., Hauschild, K., Heine, M., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Ivanov, P., Jazrawi, S., Korgul, A., Koseoglou, P., Kroell, T., Kurtukian-Nieto, T., Le Meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lozeva, R., Matea, I, Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Reygadas-Tello, D., Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Wasilewska, B., Wiederhold, J., Yavachova, M., Zeiser, F., Ziliani, S., Gerst, R-B, Blazhev, A., Warr, N., Wilson, J. N., Lebois, M., Jovancevic, N., Thisse, D., Canavan, R., Rudigier, M., Etasse, D., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Courtin, S., Cortes, M. L., Davies, P., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gjestvang, D., Gottardo, A., Guadilla, V, Haefner, G., Hauschild, K., Heine, M., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Ivanov, P., Jazrawi, S., Korgul, A., Koseoglou, P., Kroell, T., Kurtukian-Nieto, T., Le Meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lozeva, R., Matea, I, Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Reygadas-Tello, D., Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Wasilewska, B., Wiederhold, J., Yavachova, M., Zeiser, F., and Ziliani, S.

Abstract

Prompt and delayed gamma-ray spectroscopy of the neutron-rich Kr-94 was performed, as part of the fission campaign at the ALTO facility of the IPN Orsay, using the fast-neutron-induced fission reaction U-238(n, f) in combination with the nu-Ball array, a novel hybrid gamma spectrometer for energy and lifetime measurements. Several new yrast and nonyrast transitions were observed for the first time, extending the previously known level scheme. Additionally, we report on the observation of a new short-lived isomer at 3444 keV with a half-life of 32(3) ns. The analysis of the Nilsson orbitals obtained from Gogny cranked Hartree-Fock-Bogoliubov calculations suggests a (9(-)) spin and an oblate deformation for this isomer corresponding to a two-quasineutron state, indicating an isomeric structure very similar to that of the neighboring isotones Sr-96 and Se-92.

Published
2020

9. Prompt and delayed gamma spectroscopy of neutron-rich Kr-94 and observation of a new isomer

Author

Gerst, R-B, Blazhev, A., Warr, N., Wilson, J. N., Lebois, M., Jovancevic, N., Thisse, D., Canavan, R., Rudigier, M., Etasse, D., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Courtin, S., Cortes, M. L., Davies, P., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gjestvang, D., Gottardo, A., Guadilla, V, Haefner, G., Hauschild, K., Heine, M., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Ivanov, P., Jazrawi, S., Korgul, A., Koseoglou, P., Kroell, T., Kurtukian-Nieto, T., Le Meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lozeva, R., Matea, I, Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Reygadas-Tello, D., Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Wasilewska, B., Wiederhold, J., Yavachova, M., Zeiser, F., Ziliani, S., Gerst, R-B, Blazhev, A., Warr, N., Wilson, J. N., Lebois, M., Jovancevic, N., Thisse, D., Canavan, R., Rudigier, M., Etasse, D., Adamska, E., Adsley, P., Algora, A., Babo, M., Belvedere, K., Benito, J., Benzoni, G., Boso, A., Bottoni, S., Bunce, M., Chakma, R., Cieplicka-Orynczak, N., Courtin, S., Cortes, M. L., Davies, P., Delafosse, C., Fallot, M., Fornal, B., Fraile, L. M., Gjestvang, D., Gottardo, A., Guadilla, V, Haefner, G., Hauschild, K., Heine, M., Henrich, C., Homm, I, Ibrahim, F., Iskra, L. W., Ivanov, P., Jazrawi, S., Korgul, A., Koseoglou, P., Kroell, T., Kurtukian-Nieto, T., Le Meur, L., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lozeva, R., Matea, I, Miernik, K., Nemer, J., Oberstedt, S., Paulsen, W., Piersa, M., Popovitch, Y., Porzio, C., Qi, L., Ralet, D., Regan, P. H., Reygadas-Tello, D., Rezynkina, K., Sanchez-Tembleque, V, Schmitt, C., Soederstroem, P-A, Suerder, C., Tocabens, G., Vedia, V., Verney, D., Wasilewska, B., Wiederhold, J., Yavachova, M., Zeiser, F., and Ziliani, S.

Abstract

Prompt and delayed gamma-ray spectroscopy of the neutron-rich Kr-94 was performed, as part of the fission campaign at the ALTO facility of the IPN Orsay, using the fast-neutron-induced fission reaction U-238(n, f) in combination with the nu-Ball array, a novel hybrid gamma spectrometer for energy and lifetime measurements. Several new yrast and nonyrast transitions were observed for the first time, extending the previously known level scheme. Additionally, we report on the observation of a new short-lived isomer at 3444 keV with a half-life of 32(3) ns. The analysis of the Nilsson orbitals obtained from Gogny cranked Hartree-Fock-Bogoliubov calculations suggests a (9(-)) spin and an oblate deformation for this isomer corresponding to a two-quasineutron state, indicating an isomeric structure very similar to that of the neighboring isotones Sr-96 and Se-92.

Published
2020

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