11 results on '"Debenham, D. M."'
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2. M1 and E2 transition rates from core-excited states in semi-magic 94Ru
- Author
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Ertoprak, A., Cederwall, B., Qi, C., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs., Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timár, J., Valiente-Dobón, J. J., and Xiao, Z. G.
- Published
- 2018
- Full Text
- View/download PDF
3. Lifetimes of core-excited states in semi-magic $^{95}$Rh
- Author
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Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs, Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timár, J., Valiente-Dobón, J. J., Xiao, Z. G., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
lifetimes ,core-excited states ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,ydinfysiikka ,ComputingMilieux_MISCELLANEOUS - Abstract
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus 95Rh. The fusion-evaporation reaction 58Ni(40Ca,3p) was used to populate high-spin states in 95Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. peerReviewed
- Published
- 2020
- Full Text
- View/download PDF
4. Lifetimes of core-excited states in semi-magic Rh-95
- Author
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Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyako, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, Johan, Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., and Department of Chemistry
- Subjects
Subatomär fysik ,Subatomic Physics ,Nuclear Theory ,TRANSITIONS ,Nuclear Experiment ,114 Physical sciences ,SHIFT ATTENUATION METHOD - Abstract
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus Rh-95. The fusion-evaporation reaction Ni-58(Ca-40, 3p) was used to populate high-spin states in Rh-95 at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6 mg/cm(2) metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. state-of-the-art theory. Remarkably, the structural features up to moderate angular momentum of nuclei immediately below the N = Z = 50 shell closures can be described with high accuracy in a very simple way by shell-model calculations including only the g(9/2) and p(1/2) subshells. Of special interest is the neutron-proton pair coupling scheme which is expected to appear in the heaviest N=Z nuclei [1,2] and the seniority structure of the N = 50 isotones [3-7]. However, multiple core-excited states have been observed in the semi-magic nuclei of the Sn-100 region [8-10]. The theoretical study of those states is a challenging task, which requires a significantly larger model space for their interpretation. Transition probabilities between nuclear states provide important constraints for theoretical modelling of the structure of the nuclei of interest. Our previous lifetime study of the semimagic (N = 50) nucleus Ru-94 [ 11,12] provided information on the electromagnetic decay properties of neutron-core excited states. We now address lifetime measurements in its closest, more neutron deficient, isotone Rh-95 using the same DSAM technique. The experimental results have been interpreted within the framework of large-scale shell-model (LSSM) calculations.
- Published
- 2020
5. M1 And E2 Transition Rates From Core-Excited States In Semi-Magic Ru-94
- Author
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Ertoprak, A., Cederwall, B., Qi, C., Doncel, M., Jakobsson, U., Nyako, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Back, T., Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Moradi, F. Ghazi, Gottardo, A., Huyuk, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, Johan, Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., Ertoprak, A., Cederwall, B., Qi, C., Doncel, M., Jakobsson, U., Nyako, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Back, T., Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Moradi, F. Ghazi, Gottardo, A., Huyuk, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, Johan, Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., and Xiao, Z. G.
- Abstract
Lifetimes of high-spin states have been measured in the semi-magic (N = 50) nucleus Ru-94. Excited states in Ru-94 were populated in the Ni-58(Ca-40, 4p)Ru-94* fusion-evaporation reaction at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from gamma-rays emitted while the residual nuclei were slowing down in a thick 6 mg/cm(2) metallic Ni-58 target. In total eight excited-state lifetimes in the angular momentum range I = (13-20)h have been measured, five of which were determined for the first time. The corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.
- Published
- 2018
- Full Text
- View/download PDF
6. Spectroscopy of Kr 70 and isospin symmetry in the T=1 fpg shell nuclei SPECTROSCOPY of Kr 70 and ISOSPIN SYMMETRY ... D. M. DEBENHAM et al
- Author
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Debenham, D. M., Bentley, M. A., Davies, P. J., Haylett, T., Jenkins, D. G., Joshi, P., Sinclair, L. F., Wadsworth, R., Ruotsalainen, P., Henderson, J., Kaneko, K., Auranen, K., Badran, H., Grahn, T., Greenlees, P., Herzaáň, A., Jakobsson, U., Konki, J., Julin, R., Juutinen, S., Leino, M., Sorri, J., Pakarinen, J., Papadakis, P., Peura, P., Partanen, J., Rahkila, P., Sandzelius, M., Sarén, J., Scholey, C., Stolze, S., Uusitalo, J., David, H. M., De Angelis, G., Korten, W., Lotay, G., Mallaburn, M., and Sahin, E.
- Abstract
The recoil-β tagging technique has been used in conjunction with the Ca40(S32,2n) reaction at a beam energy of 88 MeV to identify transitions associated with the decay of the 2+ and, tentatively, 4+ states in the nucleus Kr70. These data are used, along with previously published data, to examine the triplet energy differences (TED) for the mass 70 isobars. The experimental TED values are compared with shell model calculations, performed with the JUN45 interaction in the fpg model space, that include a J=0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV. The agreement is found to be very good up to spin 4 and supports the expectation for analog states that all three nuclei have the same oblate shape at low-spin. The A=70 results are compared with the experimental and shell model predicted TED and mirror energy differences (MED) for the mass 66 and 74 systems. The comparisons clearly demonstrate the importance of the isotensor INC interaction in replicating the TED data in this region. Issues related to the observed MED values and their interpretation within the shell model are discussed.
- Published
- 2016
7. LIFETIME MEASUREMENTS WITH THE DOPPLER SHIFT ATTENUATION METHOD USING A THICK HOMOGENEOUS PRODUCTION TARGET - VERIFICATION OF THE METHOD
- Author
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Ertoprak, Aysegul, Cederwall, Bo, Jakobsson, Ulrika, Nyako, B. M., Nyberg, J., Davies, P., Doncel, Maria, De France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al-Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T., Ideguchi, E., Jaworski, G., Li, H., Michelagnoli, C., Modamio, V., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., Ertoprak, Aysegul, Cederwall, Bo, Jakobsson, Ulrika, Nyako, B. M., Nyberg, J., Davies, P., Doncel, Maria, De France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al-Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T., Ideguchi, E., Jaworski, G., Li, H., Michelagnoli, C., Modamio, V., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., and Xiao, Z. G.
- Abstract
Doppler Shift Attenuation Method (DSAM) analysis of excited-state lifetimes normally employs thin production targets mounted on a thick stopper foil ("backing") serving to slow down and stop the recoiling nuclei of interest in a well-defined manner. Use of a thick, homogeneous production target leads to a more complex analysis as it results in a substantial decrease in the energy of the incident projectile which traverses the target with an associated change in the production cross section of the residues as a function of penetration depth. Here, a DSAM lifetime analysis using a thick homogeneous target has been verified using the Doppler broadened lineshapes of gamma rays following the decay of highly excited states in the semi-magic (N = 50) nucleus Ru-94. Lifetimes of excited states in the Ru-94 nucleus have been obtained using a modified version of the LINESHAPE package from the Doppler broadened lineshapes resulting from the emission of the gamma rays, while the residual nuclei were slowing down in the thick (6 mg/cm(2)) metallic Ni-58 target. The results have been validated by comparison with a previous measurement using a different (RDDS) technique., QC 20170508
- Published
- 2017
- Full Text
- View/download PDF
8. Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei
- Author
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Debenham, D. M., primary, Bentley, M. A., additional, Davies, P. J., additional, Haylett, T., additional, Jenkins, D. G., additional, Joshi, P., additional, Sinclair, L. F., additional, Wadsworth, R., additional, Ruotsalainen, P., additional, Henderson, J., additional, Kaneko, K., additional, Auranen, K., additional, Badran, H., additional, Grahn, T., additional, Greenlees, P., additional, Herzaáň, A., additional, Jakobsson, U., additional, Konki, J., additional, Julin, R., additional, Juutinen, S., additional, Leino, M., additional, Sorri, J., additional, Pakarinen, J., additional, Papadakis, P., additional, Peura, P., additional, Partanen, J., additional, Rahkila, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Stolze, S., additional, Uusitalo, J., additional, David, H. M., additional, de Angelis, G., additional, Korten, W., additional, Lotay, G., additional, Mallaburn, M., additional, and Sahin, E., additional
- Published
- 2016
- Full Text
- View/download PDF
9. M1 and E2 transition rates from core-excited states in semi-magic 94Ru
- Author
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Ertoprak, Aysegul, Cederwall, Bo, Qi, Chong, Doncel, Maria, Jakobsson, U., Nyako, B. M., Jaworski, G, Davies, P., De France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Al-Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., Ertoprak, Aysegul, Cederwall, Bo, Qi, Chong, Doncel, Maria, Jakobsson, U., Nyako, B. M., Jaworski, G, Davies, P., De France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Al-Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., and Xiao, Z. G.
- Abstract
Lifetimes of high-spin states have been measured in the semi-magic (N=50) nucleus 94Ru. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru∗ fusion-evaporation reaction at the Grand Accelerateur National d’Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from γ-rays emitted while the residual nuclei were slowing down in a thick 6 mg/cm2 metallic 58Ni target. In total eight excited-state lifetimes in the angular momentum range I = (13 − 20)ħ have been measured, five of which were determined for the first time. The deduced corresponding B(M1) and B(E2)reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations., QC 20171109
10. Lifetime measurements of core-excited states in semi-magic 95Rh
- Author
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Ertoprak, Aysegul, Qi, Chong, Cederwall, Bo, Doncel, Maria, Jakobsson, U., Nyako, B., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al-Azri, H., Algora, A., de Angelis, G., Atac Nyberg, Ayse, Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T, Ideguchi, E., Li, Hongjie J., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., Ertoprak, Aysegul, Qi, Chong, Cederwall, Bo, Doncel, Maria, Jakobsson, U., Nyako, B., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al-Azri, H., Algora, A., de Angelis, G., Atac Nyberg, Ayse, Bäck, Torbjörn, Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Erturk, S., Gadea, A., Ghazi Moradi, Farnaz, Gottardo, A., Huyuk, T, Ideguchi, E., Li, Hongjie J., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timar, J., Valiente-Dobon, J. J., and Xiao, Z. G.
- Abstract
Lifetimes of negative-parity states have been determined in the semi-magic (N=50) nucleus 95Rh. The fusion-evaporation reaction 58Ni(40Ca, 3p) was used to populate high-spin states in 95Rh at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6~ mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations., QC 20200409
11. Spectroscopy of 70Kr and isospin symmetry in the T = 1 fpg shell nuclei.
- Author
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Debenham, D. M., Bentley, M. A., Davies, P. J., Haylett, T., Jenkins, D. G., Joshi, P., Sinclair, L. F., Wadsworth, R., Ruotsalainen, P., Henderson, J., Kaneko, K., Auranen, K., Badran, H., Grahn, T., Greenlees, P., Herzaáň, A., Jakobsson, U., Konki, J., Julin, R., and Juutinen, S.
- Subjects
- *
ISOBARIC spin , *KRYPTON isotopes , *SPECTRUM analysis - Abstract
The recoil-β tagging technique has been used in conjunction with the 40Ca(32S,2n) reaction at a beam energy of 88 MeV to identify transitions associated with the decay of the 2+ and, tentatively, 4+ states in the nucleus 70Kr. These data are used, along with previously published data, to examine the triplet energy differences (TED) for the mass 70 isobars. The experimental TED values are compared with shell model calculations, performed with the JUN45 interaction in the fpg model space, that include a J=0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV. The agreement is found to be very good up to spin 4 and supports the expectation for analog states that all three nuclei have the same oblate shape at low-spin. The A=70 results are compared with the experimental and shell model predicted TED and mirror energy differences (MED) for the mass 66 and 74 systems. The comparisons clearly demonstrate the importance of the isotensor INC interaction in replicating the TED data in this region. Issues related to the observed MED values and their interpretation within the shell model are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
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