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180 results on '"Konstantinopoulos, T."'

1. High-resolution spectroscopy of neutron-rich Br isotopes and signatures for a prolate-to-oblate shape transition at N=56

Author

Dudouet, J., Colombi, G., Tello, D. Reygadas, Michelagnoli, C., Dao, D. D., Nowacki, F., Abushawish, M., Clément, E., Costache, C., Duchêne, G., Kandzia, F., Lemasson, A., Marginean, N., Marginean, R., Mihai, C., Pascu, S., Rejmund, M., Rezynkina, K., Stezowski, O., Turturica, A., Ujeniuc, S., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Gadea, A., Gottardo, A., Jones, P., Konstantinopoulos, T., Kuti, I., Blanc, F. Le, Lenzi, S. M., Lozeva, R., Million, B., Pérez-Vidal, R. M., Petrache, C. M., Ralet, D., Redon, N., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The first systematic experimental study of the neutron-rich Br isotopes with two complementary state-of-the-art techniques is presented. These isotopes have been populated in the fission process at two different facilities, GANIL and ILL. New spectroscopic information has been obtained for odd-even $^{87-93}$Br isotopes and the experimental results have been compared with state-of-the-art Large-Scale Shell-Model and DNO Shell-Model calculations. As a result of such theoretical approaches, a transition from prolate ($^{87,89}$Br) to oblate ($^{91,93}$Br) shapes is obtained from the subtle balance between proton and neutron quadrupole deformations, as a clear signature of pseudo-SU3 quadrupole regime., Comment: 17 pages, 24 figures, 5 tables

Published
2024
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2. Structure of $^{83}$As, $^{85}$As and $^{87}$As: from semi-magicity to $\gamma$-softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Blanc, F. Le, Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Nuclear Experiment
Abstract

The structure of $^{83}$As, $^{85}$As and $^{87}$As have been studied in fusion-fission reaction $^{238}$U+$^9$Be. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident $\gamma$-rays were detected in the $\gamma$-ray tracking array AGATA. New transitions in $^{83}$As and $^{85}$As are reported and placed in the level schemes. A level scheme of the excited states in $^{87}$As is proposed for the first time. The data are interpreted in frame of Large-Scale Shell-Model calculations, SU3 symmetries and Beyond Mean-Field frameworks. A spherical regime at magic number $N$=50 is predicted and the location of the proton $g_{9/2}$ orbital is proposed for the first time. Development of collectivity in a prolate deformed, $\gamma$-soft regime in the open shell cases $^{85}$As and $^{87}$As, most neutron-rich isotopes beyond $N$=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the $9/2^+$ state in $^{79}$Cu, one proton above $^{78}$Ni.

Published
2022
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3. Primary gamma-ray spectra in 44Ti of astrophysical interest

Author

Larsen, A. C., Goriely, S., Bürger, A., Guttormsen, M., Görgen, A., Harrisopulos, S., Kmiecik, M., Konstantinopoulos, T., Lagoyannis, A., Lönnroth, T., Mazurek, K., Norrby, M., Nyhus, H. T., Perdikakis, G., Schiller, A., Siem, S., Spyrou, A., Syed, N. U. H., Toft, H. K., Tveten, G. M., and Voinov, A.

Subjects
Nuclear Experiment
Abstract

Primary gamma-ray spectra for a wide excitation-energy range have been extracted for 44Ti from particle-gamma coincidence data of the 46Ti(p,t gamma)44Ti reaction. These spectra reveal information on the gamma-decay pattern of the nucleus, and may be used to extract the level density and radiative strength function applying the Oslo method. Models of the level density and radiative strength function are used as input for cross-section calculations of the 40Ca(alpha,gamma)44Ti reaction. Acceptable models should reproduce data on the 40Ca(alpha,gamma)44Ti reaction cross section as well as the measured primary gamma-ray spectra. This is only achieved when a coherent normalization of the slope of the level density and radiative strength function is performed. Thus, the overall shape of the experimental primary gamma-ray spectra puts a constraint on the input models for the rate calculations., Comment: 14 pages, 13 figures

Published
2012
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4. Nuclear Level Density and Gamma-Ray Strength Function of 43Sc

Author

Bürger, A., Larsen, A. C., Hilaire, S., Guttormsen, M., Harissopulos, S., Kmiecik, M., Konstantinopoulos, T., Krticka, M., Lagoyannis, A., Lönnroth, T., Mazurek, K., Norrby, M., Nyhus, H. T., Perdikakis, G., Siem, S., Spyrou, A., and Syed, N. U. H.

Subjects
Nuclear Experiment
Abstract

The nuclear level density and the gamma-ray strength function have been determined for 43Sc in the energy range up to 2 MeV below the neutron separation energy using the Oslo method with the 46Ti(p,alpha)43Sc reaction. A comparison to 45Sc shows that the level density of 43Sc is smaller by an approximately constant factor of two. This behaviour is well reproduced in a microscopical/combinatorial model calculation. The gamma-ray strength function is showing an increase at low gamma-ray energies, a feature which has been observed in several nuclei but which still awaits theoretical explanation., Comment: 5 pages, 4 figures

Published
2012
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5. Investigation of the reaction 74Ge(p,gamma)75As using the in-beam method to improve reaction network predictions for p nuclei

Author

Sauerwein, A., Endres, J., Netterdon, L., Zilges, A., Foteinou, V., Provatas, G., Konstantinopoulos, T., Axiotis, M., Ashley, S. F., Harissopulos, S., and Rauscher, T.

Subjects
Nuclear Experiment
Abstract

A measurement of 74Ge(p,gamma)75As at low proton energies, inside the astrophysically relevant energy region, is important in several respects. The reaction is directly important as it is a bottleneck in the reaction flow which produces the lightest p nucleus 74Se. It is also an important addition to the data set required to test reaction-rate predictions and to allow an improvement in the global p+nucleus optical potential required in such calculations. An in-beam experiment was performed, making it possible to measure in the energy range between 2.1 and 3.7 MeV, which is for the most part inside the astrophysically relevant energy window. Angular distributions of the gamma-ray transitions were measured with high-purity germanium detectors at eight angles relative to the beam axis. In addition to the total cross sections, partial cross sections for the direct population of twelve levels were determined. The resulting cross sections were compared to Hauser-Feshbach calculations using the code SMARAGD. Only a constant renormalization factor of the calculated proton widths allowed a good reproduction of both total and partial cross sections. The accuracy of the calculation made it possible to check the spin assignment of some states in 75As. In the case of the 1075 keV state, a double state with spins and parities of 3/2- and 5/2- is needed to explain the experimental partial cross sections. A change in parity from 5/2+ to 5/2- is required for the state at 401 keV. Furthermore, in the case of 74Ge, studying the combination of total and partial cross sections made it possible to test the gamma width, which is essential in the calculation of the astrophysical 74$As(n,gamma)75As rate., Comment: 13 pages, 12 figures

Published
2012
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6. Coulomb excitation of 73Ga

Author

Diriken, J., Stefanescu, I., Balabanski, D., Blasi, N., Blazhev, A., Bree, N., Cederkäll, J., Cocolios, T. E., Davinson, T., Eberth, J., Ekström, A., Fedorov, D. V., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Georgiev, G., Gladnishki, K., Huyse, M., Ivanov, O. V., Ivanov, V. S., Iwanicki, J., Jolie, J., Konstantinopoulos, T., Kröll, Th., Krücken, R., Köster, U., Lagoyannis, A., Bianco, G. Lo, Maierbeck, P., Marsh, B. A., Napiorkowski, P., Patronis, N., Pauwels, D., Reiter, P., Seliverstov, M., Sletten, G., Van de Walle, J., Van Duppen, P., Voulot, D., Walters, W. B., Warr, N., Wenander, F., and Wrzosek, K.

Subjects
Nuclear Experiment
Abstract

The B(E2; Ii -> If) values for transitions in 71Ga and 73Ga were deduced from a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using post-accelerated beams of 71,73Ga at the REX-ISOLDE on-line isotope mass separator facility. The emitted gamma rays were detected by the MINIBALL-detector array and B(E2; Ii->If) values were obtained from the yields normalized to the known strength of the 2+ -> 0+ transition in the 120Sn target. The comparison of these new results with the data of less neutron-rich gallium isotopes shows a shift of the E2 collectivity towards lower excitation energy when adding neutrons beyond N = 40. This supports conclusions from previous studies of the gallium isotopes which indicated a structural change in this isotopical chain between N = 40 and N = 42. Combined with recent measurements from collinear laser spectroscopy showing a 1/2- spin and parity for the ground state, the extracted results revealed evidence for a 1/2-; 3/2- doublet near the ground state in 73 31Ga42 differing by at most 0.8 keV in energy.

Published
2010
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7. Fermi's golden rule applied to the gamma decay in the quasicontinuum of 46Ti

Author

Guttormsen, M., Larsen, A. C., Buerger, A., Goergen, A., Harissopulos, S., Kmiecik, M., Konstantinopoulos, T., Krticka, M., Lagoyannis, A., Loennroth, T., Mazurek, K., Norrby, M., Nyhus, H. T., Schiller, G. Perdikakis A., Siem, S., Spyrou, A., Syed, N. U. H., Toft, H. K., Tveten, G. M., and Voinov, A.

Subjects
Nuclear Experiment
Abstract

Particle-gamma coincidences from the 46Ti(p,p' gamma)46Ti inelastic scattering reaction with 15-MeV protons are utilized to obtain gamma-ray spectra as a function of excitation energy. The rich data set allows analyzing the coincidence data with various gates on excitation energy. This enables, for many independent data sets, a simultaneous extraction of level density and radiative strength function (RSF). The results are consistent with one common level density. The data seem to exhibit a universal RSF as the deduced RSFs from different excitation energies show only small fluctuations provided that only excitation energies above 3 MeV are taken into account. If transitions to well-separated low-energy levels are included, the deduced RSF may change by a factor of 2-3, which might be expected due to the involved Porter-Thomas fluctuations., Comment: 11 pages and 12 figures

Published
2010
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8. Extraction of thermal and electromagnetic properties in 45Ti

Author

Syed, N. U. H., Larsen, A. C., Bürger, A. B., Guttormsen, M., Harissopulos, S., Kmiecik, M., Konstantinopoulos, T., Krtička, M., Lagovannis, A., Lönnroth, T., Mazurek, K., Norby, M., Nyhus, H. T., Perdikakis, G., Siem, S., and Spyrou, A.

Subjects
Nuclear Experiment
Abstract

The level density and gamma-ray strength function of 45Ti have been determined by use of the Oslo method. The particle-gamma coincidences from the 46Ti(p,d gamma)45Ti pick-up reaction with 32 MeV protons are utilized to obtain gamma-ray spectra as function of excitation energy. The extracted level density and strength function are compared with models, which are found to describe these quantities satisfactorily. The data do not reveal any single-particle energy gaps of the underlying doubly magic 40Ca core, probably due to the strong quadruple deformation.

Published
2009
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9. Structure of As83, As85, and As87 : From semimagicity to γ softness

Author

Rezynkina, K., primary, Dao, D. D., additional, Duchêne, G., additional, Dudouet, J., additional, Nowacki, F., additional, Clément, E., additional, Lemasson, A., additional, Andreoiu, C., additional, Astier, A., additional, de Angelis, G., additional, de France, G., additional, Delafosse, C., additional, Deloncle, I., additional, Didierjean, F., additional, Dombradi, Z., additional, Ducoin, C., additional, Gadea, A., additional, Gottardo, A., additional, Guinet, D., additional, Jacquot, B., additional, Jones, P., additional, Konstantinopoulos, T., additional, Kuti, I., additional, Korichi, A., additional, Lenzi, S. M., additional, Li, G., additional, Le Blanc, F., additional, Lizarazo, C., additional, Lozeva, R., additional, Maquart, G., additional, Million, B., additional, Michelagnoli, C., additional, Napoli, D. R., additional, Navin, A., additional, Pérez-Vidal, R. M., additional, Petrache, C. M., additional, Pietralla, N., additional, Ralet, D., additional, Ramdhane, M., additional, Rejmund, M., additional, Stezowski, O., additional, Schmitt, C., additional, Sohler, D., additional, and Verney, D., additional

Published
2022
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10. A new recoil distance technique using low energy coulomb excitation in inverse kinematics

Author

Rother, W., Dewald, A., Pascovici, G., Fransen, C., Frießner, G., Hackstein, M., Ilie, G., Iwasaki, H., Jolie, J., Melon, B., Petkov, P., Pfeiffer, M., Pissulla, Th., Zell, K.-O., Jakobsson, U., Julin, R., Jones, P., Ketelhut, S., Nieminen, P., Peura, P., Rahkila, P., Uusitalo, J., Scholey, C., Harissopulos, S., Lagoyannis, A., Konstantinopoulos, T., Grahn, T., and Balabanski, D.

Published
2011
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13. Structure of <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>83</mn></mmultiscripts><mo>,</mo></math> <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>85</mn></mmultiscripts><mo>,</mo></math> and <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>87</mn></mmultiscripts></math>: From semimagicity to <math><mi>γ</mi></math> softness

Author

Rezynkina, K., Dao, D.D., Duchene, G., Dudouet, J., Nowacki, F., Clément, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S.M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D.R., Navin, A., Perez-Vidal, R.M., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., Verney, D., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The structure of As83, As85, and As87 have been studied in fusion-fission reaction U238+Be9. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident γ rays were detected in the γ-ray tracking array AGATA. New transitions in As83 and As85 are reported and placed in the level schemes. A level scheme of the excited states in As87 is proposed for the first time. The data are interpreted in frame of large-scale shell-model calculations, SU3 symmetries, and beyond mean-field frameworks. A spherical regime at magic number N=50 is predicted and the location of the proton g9/2 orbital is proposed for the first time. Development of collectivity in a prolate deformed, γ-soft regime in the open shell cases As85 and As87, most neutron-rich isotopes beyond N=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the 9/2+ state in Cu79, one proton above Ni78.

Published
2022
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14. Structure of 83As, 85As, and 87As : From semimagicity to gamma softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Published
2022

15. Studies of fission fragment yields via high-resolution γ-ray spectroscopy

Author

Wilson J.N., Lebois M., Qi L., Amador-Celdran P, Bleuel D., Briz J.A., Carroll R., Catford W., Witte H. De, Doherty D.T., Eloirdi R., Georgiev G., Gottardo A., Goasduff A., Hadyñska-Klek K., Hauschild K., Hess H., Ingeberg V., Konstantinopoulos T., Ljungvall J., Lopez-Martens A., Lorusso G., Lozeva R., Lutter R., Marini P., Matea I., Materna T., Mathieu L., Oberstedt A., Oberstedt S., Panebianco S., Podolyak Zs., Porta A., Regan P.H., Reiter P., Rezynkina K., Rose S.J., Sahin E., Seidlitz M., Serot O., Shearman R., Siebeck B., Siem S., Smith A.G., Tveten G.M., Verney D., Warr N., Zeiser F., and Zielinska M.

Subjects
Physics, QC1-999
Abstract

Precise spectroscopic information on the fast neutron induced fission of the 238U(n,f) reaction was recently gained using a new technique which involved coupling of the Miniball high resolution y-ray spectrometer and the LICORNE directional neutron source. The experiment allowed measurement of the isotopic fission yields for around 40 even-even nuclei at an incident neutron energy of around 2 MeV where yield data are very sparse. In addition spectroscopic information on very neutron-rich fission products was obtained. Results were compared to models, both the JEFF-3.1.1 data base and the GEF code, and large discrepancies for the S1 fission mode in the Sn/Mo isotope pair were discovered. This suggests that current models are overestimating the role played by spherical shell effects in fast neutron induced fission. In late 2017 and 2018 the nu-ball hybrid spectrometer will be constructed at the IPN Orsay to perform further experimental investigations with directional neutrons coupled to a powerful hybrid Ge/LaBr3 detector array. This will open up new possibilities for measurements of fission yields for fast-neutron-induced fission using the spectroscopic technique and will be complimentary to other methods being developed.

Published
2018
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16. Evidence of octupole-phonons at high spin in Pb

Author

Ralet, D., Clément, E., Georgiev, G., Stuchbery, A.E., Rejmund, M., Van Isacker, P., de France, G., Lemasson, A., Ljungvall, J., Michelagnoli, C., Navin, A., Balabanski, D.L., Atanasova, L., Blazhev, A., Bocchi, G., Carroll, R., Dudouet, J., Dupont, E., Fornal, B., Franchoo, S., Fransen, C., Müller-Gatermann, C., Goasduff, A., Gadea, A., John, P.R., Kocheva, D., Konstantinopoulos, T., Korichi, A., Kusoglu, A., Lenzi, S.M., Leoni, S., Lozeva, R., Maj, A., Perez, R., Pietralla, N., Shand, C., Stezowski, O., Wilmsen, D., Yordanov, D., Barrientos, D., Bednarczyk, P., Birkenbach, B., Boston, A.J., Boston, H.C., Burrows, I., Cederwall, B., Ciemala, M., Collado, J., Crespi, F., Cullen, D., Eberth, H.J., Goupil, J., Harkness, L., Hess, H., Jungclaus, A., Korten, W., Labiche, M., Menegazzo, R., Mengoni, D., Million, B., Nyberg, J., Podolyák, Zs., Pullia, A., Quintana Arnés, B., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D., Sanchis, E., Theisen, C., Valiente Dobon, J.J., and Wieland, O.

Abstract

A lifetime measurement of the 19/2− state in $^{207}$Pb has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a $^{208}$Pb beam impinging on a $^{100}$Mo enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt γ rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3,19/2−→13/2+)=40(8) W.u. is the first indication of the octupole phonon at high spin in $^{207}$Pb. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in $^{207}$Pb is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6+ state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation.

Published
2019

17. Excitations of the magic N=50 neutron-core revealed in Ga 81

Author

Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombrádi, Zs., Ducoin, C., Gadea, Andrés, Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, Silvia M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R. M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019

18. γ-ray spectroscopy of fission fragments from the cold-neutron 235U induced fission with EXILL

Author

Konstantinopoulos T., Astier A., Petrache C., Abudra A., Bontemps R., Deloncle I., Kaim S., Leguillon R., Porquet M.-G., Zerrouki T., Grente L., Salsac M.-D., Zielinska M., France G. de, Janas Z., Karny M., Korgul A., Ramdhane M., Gey G., Simpson G., Vancraeyenest A., Blanc A., Jentschel M., Köster U., Mutti P., Soldner T., Urban W., Duchêne G., Lozeva R., Ibrahim F., Gargano A., Covello A., Mengoni D., Ur C.A., Sferrazza M., and Melon B.

Subjects
Physics, QC1-999
Abstract

A cold neutron induced fission experiment recently took place at the Institute Laue-Langevin (ILL) in Grenoble. The neutron beam was provided by the nuclear reactor facility at ILL and the detector setup that was used for the γ-spectroscopy of the fission products consisted mainly of the detectors of the EXOGAM array [1], thereby the name of the campaign is EXILL. The main purpose of our measurement was to investigate the nuclei in the region with N = 50 close to 78Ni as well as the nuclei close to the N = 82 shell closure. In this paper, the motivation of the experiment is described as well as the experimental setup and the status of the ongoing data analysis.

Published
2013
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19. Excitations of the magic $N=50$ neutron-core revealed in $^{81}$Ga

Author

Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, S.M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R.M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic and Molecular Clusters, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019
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20. Evidence of octupole-phonons at high spin in Pb-207

Author

Ralet, D., Clement, E., Georgiev, G., Stuchbery, A. E., Rejmund, M., Van Isacker, R., de France, G., Lemasson, A., Ljungvall, J., Michelagnoli, C., Navin, A., Balabanski, D. L., Atanasova, L., Blazhev, A., Bocchi, G., Carroll, R., Dudouet, J., Dupont, E., Forna, B., Franchoo, S., Fransen, C., Mueller-Gatermann, C., Goasduff, A., Gadea, A., John, P. R., Kocheva, D., Konstantinopoulos, T., Korichi, A., Kusoglu, A., Lenzi, S. M., Leoni, S., Lozeva, R., Maj, A., Perez, R., Pietralla, N., Shand, C., Stezowski, O., Wilmsen, D., Yordanov, D., Barrientos, D., Bednarczyk, R., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I, Cederwall, B., Ciemala, M., Collado, J., Crespi, F., Cullen, D., Eberth, H. J., Goupil, J., Harkness, L., Hess, H., Jungclaus, A., Korten, W., Labiche, M., Menegazzo, R., Mengoni, D., Million, B., Nyberg, Johan, Podolyak, Zs, Pullia, A., Quintana Arnes, B., Recchia, F., Reiter, R., Saillant, F., Salsac, M. D., Sanchis, E., Theisen, C., Dobon, J. J. Valiente, and Wieland, O.

Subjects
Subatomär fysik, Plunger device, VAMOS plus plus spectrometer, Subatomic Physics, Octupole phonon, AGATA spectrometer, gamma-Ray tracking, Nuclear deformation
Abstract

A lifetime measurement of the 19/2(-) state in Pb-207 has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a Pb-208 beam impinging on a Mo-100 enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt gamma rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3, 19/2(-) -> 13/2(+)) = 40(8) W.u. is the first indication of the octupole phonon at high spin in Pb-207. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in Pb-207 is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6(+) state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation. Crown Copyright (C) 2019 Published by Elsevier B.V.

Published
2019

22. Lifetime Measurements at NCSR “Demokritos”

Author

Ashley, S. F., primary, Axiotis, M., additional, Foteinou, V., additional, Harrisopulos, S., additional, Konstantinopoulos, T., additional, Lagoyannis, A., additional, Mertzimekis, T. J., additional, and Provatas, G., additional

Published
2020
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23. Do light nuclei display a universal γ-ray strength function?

Author

Voinov A., Norrby M., Schiller A., Krtička T., Lönnroth T., Kmiecik M., Mazurek K., Perdikakis G., Spyrou A., Lagoyannis A., Konstantinopoulos T., Tveten G.M., Harissopulos S., Syed N.U.H., Toft H.K., Nyhus H.T., Siem S., Bürger A., Görgen A., Guttormsen M., and Larsen A.C.

Subjects
Physics, QC1-999
Abstract

In this work we focus on properties in the quasi-continuum of light nuclei. Generally, both level density and γ-ray strength function (γ-SF) differ from nucleus to nucleus. In order to investigate this closer, we have performed particle-γ coincidences using the reactions (p, p'), (p, d) and (p, t) on a 46Ti target. In particular, the very rich data set of the 46Ti(p, p')46Ti inelastic scattering reaction allows analysis of the coincidence data for many independent data sets. Using the Oslo method, we find one common level density for all data sets. If transitions to well-separated low-energy levels are included, the deduced γ-SF may change by a factor of 2 – 3, due strong to Porter-Thomas fluctuations. However, a universal γ-SF with small fluctuations is found provided that only excitation energies above 3 MeV are taken into account. The nuclear structure of the titaniums is discussed within a combinatorial quasi-particle model, showing that only few Nilsson orbitals participate in building up the level density for these light nuclei.

Published
2012
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26. Evidence of octupole-phonons at high spin in 207Pb

Author

Ralet, D., primary, Clément, E., additional, Georgiev, G., additional, Stuchbery, A.E., additional, Rejmund, M., additional, Van Isacker, P., additional, de France, G., additional, Lemasson, A., additional, Ljungvall, J., additional, Michelagnoli, C., additional, Navin, A., additional, Balabanski, D.L., additional, Atanasova, L., additional, Blazhev, A., additional, Bocchi, G., additional, Carroll, R., additional, Dudouet, J., additional, Dupont, E., additional, Fornal, B., additional, Franchoo, S., additional, Fransen, C., additional, Müller-Gatermann, C., additional, Goasduff, A., additional, Gadea, A., additional, John, P.R., additional, Kocheva, D., additional, Konstantinopoulos, T., additional, Korichi, A., additional, Kusoglu, A., additional, Lenzi, S.M., additional, Leoni, S., additional, Lozeva, R., additional, Maj, A., additional, Perez, R., additional, Pietralla, N., additional, Shand, C., additional, Stezowski, O., additional, Wilmsen, D., additional, Yordanov, D., additional, Barrientos, D., additional, Bednarczyk, P., additional, Birkenbach, B., additional, Boston, A.J., additional, Boston, H.C., additional, Burrows, I., additional, Cederwall, B., additional, Ciemala, M., additional, Collado, J., additional, Crespi, F., additional, Cullen, D., additional, Eberth, H.J., additional, Goupil, J., additional, Harkness, L., additional, Hess, H., additional, Jungclaus, A., additional, Korten, W., additional, Labiche, M., additional, Menegazzo, R., additional, Mengoni, D., additional, Million, B., additional, Nyberg, J., additional, Podolyák, Zs., additional, Pullia, A., additional, Quintana Arnés, B., additional, Recchia, F., additional, Reiter, P., additional, Saillant, F., additional, Salsac, M.D., additional, Sanchis, E., additional, Theisen, C., additional, Valiente Dobon, J.J., additional, and Wieland, O., additional

Published
2019
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27. Excitations of the magic N=50 neutron-core revealed in Ga81

Author

Dudouet, J., primary, Lemasson, A., additional, Maquart, G., additional, Nowacki, F., additional, Verney, D., additional, Rejmund, M., additional, Duchêne, G., additional, Stezowski, O., additional, Clément, E., additional, Michelagnoli, C., additional, Korichi, A., additional, Andreoiu, C., additional, Astier, A., additional, de Angelis, G., additional, de France, G., additional, Delafosse, C., additional, Deloncle, I., additional, Didierjean, F., additional, Dombradi, Z., additional, Ducoin, C., additional, Gadea, A., additional, Gottardo, A., additional, Guinet, D., additional, Jacquot, B., additional, Jones, P., additional, Konstantinopoulos, T., additional, Kuti, I., additional, Le Blanc, F., additional, Lenzi, S. M., additional, Li, G., additional, Lozeva, R., additional, Million, B., additional, Napoli, D. R., additional, Navin, A., additional, Pérez-Vidal, R. M., additional, Petrache, C. M., additional, Ralet, D., additional, Ramdhane, M., additional, Redon, N., additional, Schmitt, C., additional, and Sohler, D., additional

Published
2019
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28. Level Densities and γ Strength Functions in Light Sc and Ti Isotopes

Author

Voinov A., Spyrou A., Siem S., Perdikakis G., Nyhus H., Norby M., Mazurek K., Lönnroth T., Lagoyannis A., Krtička M., Konstantinopoulos T., Kmiecik M., Harissopulos S., Guttormsen M., Syed N.U.H., Larsen A.C., and Bürger A.

Subjects
Physics, QC1-999
Abstract

We present preliminary results from a measurement of nuclear level densities and the γ-ray strength of light Sc and Ti isotopes using the Oslo Method.

Published
2010
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29. EXILL—a high-efficiency, high-resolution setup for $\gamma$-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., De France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E.Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R.J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Grenoble (INPG), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin ( ILL ), Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Institut National Polytechnique de Grenoble ( INPG ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Werner, Volker -- 0000-0003-4001-0150, Regnier, David -- 0000-0002-0345-7271, Britton, Richard -- 0000-0001-8532-8504, Cederwall, Bo -- 0000-0003-1771-2656, Valenta, Stanislav -- 0000-0003-2479-1380, Schwengner, Ronald -- 0000-0002-7620-8882, Olaizola, Bruno -- 0000-0003-1604-0640, nannini, adriana -- 0000-0003-0659-7648, Lica, Razvan -- 0000-0001-7066-9787, Petrache, Costel -- 0000-0001-8419-1390, Scheck, Marcus -- 0000-0002-9624-3909, Fraile, Luis M -- 0000-0002-6281-3635, Napoli, Daniel R. -- 0000-0002-8154-6958, Soldner, Torsten -- 0000-0003-2468-5182, GOTTARDO, Andrea -- 0000-0002-0390-5767, Belgya, Tamas -- 0000-0003-4281-5470, Wilson, Emma -- 0000-0003-2695-9853, Clement, Emmanuel -- 0000-0003-1887-717X, de France, Gilles -- 0000-0002-7439-1759, Vedia, Victoria -- 0000-0001-6671-3888, Celikovic, Igor -- 0000-0002-5642-4393, Lozeva, Radomira -- 0000-0002-0024-7068, Lalkovski, Stefan -- 0000-0003-3069-9708, Bottoni, Simone -- 0000-0003-2249-4825, [Jentschel, M. -- Blanc, A. -- Koster, U. -- Mutti, P. -- Soldner, T. -- Urban, W. -- Michelagnoli, C.] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France -- [de France, G. -- Celikovic, I. -- Clement, E. -- Michelagnoli, C.] GANIL, Bvd Becquerel,BP 55027, F-14076 Caen 05, France -- [Leoni, S. -- Benzoni, G. -- Bocchi, G. -- Bottoni, S. -- Crespi, F. -- Million, B. -- Vandone, V.] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy -- [Simpson, G.] Univ Grenoble Alpes, LPSC, F-38026 Grenoble, France -- [Ur, C.] Univ Padua, Dipartimento Fis, Via F Marzolo 8, I-35131 Padua, Italy -- [Ur, C. -- Balabanski, D.] ELI NP, IFIN HH30, Bucharest 077125, Romania -- [Urban, W. -- Czerwinski, M. -- Korgul, A. -- Kurpeta, J. -- Mazzocchi, C.] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland -- [Pfeiffer, M. -- Regis, J. M. -- Saed-Samii, N. -- Thomas, T. -- Warr, N.] Univ Cologne, IKP, Zulpicher Str 77, D-50937 Cologne, Germany -- [Astier, A. -- Konstantinopoulos, T. -- Lozeva, R. -- Petrache, C. -- Zerrouki, T.] Univ Paris Saclay, CNRS, IN2P3, CSNSM, F-91405 Orsay, France -- [Augey, L. -- Guinet, D. -- Redon, N. -- Stezowski, O.] Lyon Univ Claude Bernard, IPN, 43 Blvd 11 Nov 1918, F-69622 Villeurbanne, France -- [Back, T. -- Cederwall, B.] KTH, Phys Dept, Roslagstullsbacken 21, S-10044 Stockholm, Sweden -- [Bajoga, A. -- Britton, R. -- Carroll, R. -- Catford, W. -- Davies, A. -- Lalkovski, S. -- Patel, Z. -- Podolyak, Z. -- Regan, P. -- Rudigier, M. -- Tom, A.] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England -- [Balabanski, D.] INRNE Sofia, 72 Tzarigradsko Shaussee, Sofia 1784, Bulgaria -- [Belgya, T.] Hungarian Acad Sci CER, Konkoly T St 29-33, H-1121 Budapest, Hungary -- [Bernards, C. -- Cooper, N. -- Werner, V.] Yale Univ, Dept Phys, POB 208120, New Haven, CT 06520 USA -- [Biswas, D. C. -- Danu, L. S. -- John, B. V. -- Mukhopadhyay, S.] Bhabha Atom Res Ctr, Nucl Phys Div, Mumbai 400085, Maharashtra, India -- [Bruyneel, B. -- Grente, L. -- Salsac, M. D. -- Zielinska, M.] CEA Saclay ORME Merisiers, DSM IRFU SPHN, Bat 703, F-91191 Gif Sur Yvette, France -- [Burnett, J.] AWE PLC, Reading RG7 4PR, Berks, England -- [Cakirli, R. B.] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey -- [Cieplicka-Oryn'czak, N. -- Szpak, B.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland -- [Csatlos, M. -- Krasznahorkay, A. -- Kuti, I. -- Timar, J. -- Tornyi, T.] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary -- [Curien, D. -- Didierjean, F. -- Duche'ne, G. -- Lozeva, R. -- Sengele, L.] Univ Strasbourg, CNRS, IPHC, UMR 7178, F-67000 Strasbourg, France -- [Drouet, F. -- Vancraeyenest, A.] INPG PHELMA, 3 Parvis Louis Neel BP 257, F-38000 Grenoble 1, France -- [Eberhardt, K. -- Mokry, C. -- Runke, J.] Johannes Gutenberg Univ Mainz, Inst Kernchem, Fritz Strassmann Weg 2, D-55128 Mainz, Germany -- [Erturk, S.] Nigde Univ, Merkez Yerleske Bor Yolu Uzeri, TR-51240 Nigde, Turkey -- [Fraile, L. M. -- Olaizola, B. -- Paziy, V. -- Vedia, V.] Univ Complutense, Grp Fis Nucl, Fis Avda Complutense, Madrid 28040, Spain -- [Gottardo, A. -- Napoli, D. R. -- Wilson, E.] INFN, Lab Nazl Legnaro, Vialle Univ 2, I-35020 Legnaro, Italy -- [Grocutt, L. -- Mulholland, K. -- Scheck, M. -- Smith, J.] Univ West Scotland, High St, Paisley PA1 2BE, Renfrew, Scotland -- [Guerrero, C.] CERN, CH-1211 Geneva 23, Switzerland -- [Hartig, A. -L. -- Henrich, C. -- Ignatov, A. -- Ilieva, S. -- Kroell, T. -- Pietralla, N. -- Thuerauf, M. -- Werner, V.] Tech Univ Darmstadt, IKP, Schlossgartenstr 9, D-64289 Darmstadt, Germany -- [Ivanova, D. -- Kisyov, S.] Univ Sofia, Fac Phys, 5 James Bourchier Blvd, Sofia 1126, Bulgaria -- [John, R. -- Massarczyk, R. -- Schwengner, R.] Helmholtz Zentrum Dresden Rossendorf, POB 510119, D-01314 Dresden, Germany -- [Larijani, C.] Natl Phys Lab, Teddington Queens Rd, Teddington, Middx, England -- [Leguillon, R. -- Orlandi, R.] JAEA, Tokai Shirakata Shirane 2-4 Tokai, Naka, Ibaraki 3191195, Japan -- [Lica, R.] IFIN HH, Bucharest Str Atomistilor 407,POB MG 6, Bucharest 76900, Romania -- [Litaize, O. -- Regnier, D.] CEA Cadarache, F-13108 St Paul Les Durance, France -- [Magron, C.] Univ Bordeaux, CENBG Bordeaux, 1 Le Haut Vigneau, F-33170 Gradignan, France -- [Magron, C.] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Florence, Italy -- [Melon, B.] INFN, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy -- [Ramdhane, M.] LPSC Grenoble, 53 Ave Martyrs, F-38026 Grenoble, France -- [Oliver, R. J.] Univ Brighton, Sch Environm & Technol, Lewes Rd, Brighton, E Sussex BN2 4GJ, England -- [Singh, P.] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India -- [Tomandl, I.] ASCR, Nucl Phys Inst, Rez 25068, Czech Republic -- [Townsley, C.] Univ Sussex, Sch Sci & Technol, Brighton BN1 9QJ, E Sussex, England -- [Tuerler, A.] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland -- [Krticka, M. -- Valenta, S.] Prague Charles Univ, Fac Math & Phys, Ke Karlovu 5, Prague 12116, Czech Republic -- [Vanhoy, J.] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 USA, 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Instrumentation for neutron sources, Spectrometers, Physics::Instrumentation and Detectors, Gamma detectors (scintillators, CZT, HPG, HgI etc), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

WOS: 000414625700003, In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., U.S. DOE grant [DE-FG02-91ER40609]; NUPNET; German BMBF [O5P12PKNUF, 05P15RDFN1, 05P12RDNUP]; German DFG contract [KR 1796/2-1]; Polish National Science Centre [DEC-2013/09/B/ST2/03485], This work has been partly supported by the Polish National Science Centre under contract DEC-2013/09/B/ST2/03485, the U.S. DOE grant No. DE-FG02-91ER40609, the NUPNET and the German BMBF under contracts O5P12PKNUF, 05P15RDFN1 and 05P12RDNUP and the German DFG contract KR 1796/2-1.

Published
2017
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30. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni-78 Region : A Hint from Lifetime Measurements

Author

Delafosse, C., Verney, D., Marevic, P., Gottardo, A., Michelagnoli, C., Lemasson, A., Goasduff, A., Ljungvall, J., Clement, E., Korichi, A., De Angelis, G., Andreoiu, C., Babo, M., Boso, A., Didierjean, F., Dudouet, J., Franchoo, S., Gadea, A., Georgiev, G., Ibrahim, F., Jacquot, B., Konstantinopoulos, T., Lenzi, S. M., Maquart, G., Matea, I, Mengoni, D., Napoli, D. R., Niksic, T., Olivier, L., Perez-Vidal, R. M., Portail, C., Recchia, F., Redon, N., Siciliano, M., Stefan, I, Stezowski, O., Vretenar, D., Zielinska, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Charles, L., Ciemala, M., Collado, J., Cullen, D. M., Desesquelles, P., de France, G., Domingo-Pardo, C., Eberth, J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Lefevre, A., Legruel, F., Menegazzo, R., Million, B., Nyberg, Johan, Quintana, B., Ralet, D., Reiter, P., Saillant, F., Sanchis, E., Theisen, Ch, and Dobon, J. J. Valiente

Subjects
Subatomär fysik, Subatomic Physics, pseudospin symmetry, nuclear energy density functionals
Abstract

Lifetime measurements of excited states of the light N = 52 isotones Kr-88, Se-86, and Ge-84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2; 2(+)-> 0(+)) and B(E2; 4(+)-> 2(+)) were obtained for the first time for the hard-to-reach 84Ge. While the B(E2; 2(+)-> 0(+) ) values of Kr-88, Se-86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g(7/2), 1h(11/2)) space of an inert Ni-78 core, the value obtained for Ge-84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N less than or similar to 49, extend beyond N = 50. The onset of collectivity at Z = 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector rho field in shell-structure evolution.

Published
2018

31. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni 78 Region:A Hint from Lifetime Measurements

Author

Delafosse, C., Verney, D., Marević, P., Gottardo, A., Michelagnoli, C., Lemasson, A., Goasduff, A., Ljungvall, J., Clément, E., Korichi, A., De Angelis, G., Andreoiu, C., Babo, M., Boso, A., Didierjean, F., Dudouet, J., Franchoo, S., Gadea, A., Georgiev, G., Ibrahim, F., Jacquot, B., Konstantinopoulos, T., Lenzi, S. M., Maquart, G., Matea, I., Mengoni, D., Napoli, D. R., Nikšić, T., Olivier, L., Pérez-Vidal, R. M., Portail, C., Recchia, F., Redon, N., Siciliano, M., Stefan, I., Stezowski, O., Vretenar, D., Zielinska, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Charles, L., Ciemala, M., Collado, J., Cullen, D. M., Désesquelles, P., and De France, G.

Abstract

Lifetime measurements of excited states of the light N=52 isotones Kr88, Se86, and Ge84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2+→0+) and B(E2;4+→2+) were obtained for the first time for the hard-to-reach Ge84. While the B(E2;2+→0+) values of Kr88, Se86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g7/2, 1h11/2) space of an inert Ni78 core, the value obtained for Ge84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N''49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.

Published
2018
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32. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Türler, Andreas, Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, 540 Chemistry, 570 Life sciences, biology
Abstract

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 n s−1cm−2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 105 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,γ)28Al and 35Cl(n,γ)36Cl in the energy range from 30 keV up to 10 MeV.

Published
2017
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33. Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, Wilton, De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadyńska-Klęk, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zsolt, Porta, A., Regan, Patrick, Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, Robert, Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

Fast-neutron-induced fission of 238U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency γ-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via γ−γ coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fast-neutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.

Published
2017

34. Kr 3696 60 -Low- Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., Lemasson, A., Duchêne, G., Rejmund, M., {Clément}, E, {Michelagnoli}, C, Didierjean, F., {Korichi}, A, Maquart, G., {Stezowski}, O, Lizarazo, C., Pérez-Vidal, R. M., Andreoiu, C, {de Angelis}, G, {Astier}, A, Delafosse, C., Deloncle, I., Dombradi, Z., {de France}, G, Gadea, A, {Gottardo}, A, {Jacquot}, B, Jones, P., {Konstantinopoulos}, T, Kuti, I., Le Blanc, F., {Lenzi}, S M, Li, G., Lozeva, R, Million, B., {Napoli}, D R, Navin, A., {Petrache}, C M, Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., {Sohler}, D, Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., Collado-Vides, Julio, Cullen, D. M., Désesquelles, P., Domingo-Pardo, C, González, V., Harkness-Brennan, L., Hess, H., Judson, D. S., Karolak, M., {Korten}, W, Labiche, M, Ljungvall, J., {Menegazzo}, R, Mengoni, D., {Pullia}, A, {Recchia}, F, Reiter, P., {Salsac}, M -D, Sanchis, E., Theisen, Ch, {Valiente-Dobón}, J J, and Zielińska, M.

Subjects
Nuclear Experiment
Abstract

Prompt γ-ray spectroscopy of the neutron-rich Kr96, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to Jπ=4+, is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R4/2=E(4+)/E(2+)=2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N=60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z=36, of similar amplitude to that observed at N=60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g9/2, d5/2, and s1/2 orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R4/2 as a function of the neutron number up to N=60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N=60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N=60 and Z=36.

Published
2017
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35. $^{96}_{36}$Kr$_{60}$–Low-Z Boundary of the Island of Deformation at N =60

Author

Dudouet, J., Lemasson, A., Duchêne, G., Rejmund, M., Clément, E., Michelagnoli, C., Didierjean, F., Korichi, A., Maquart, G., Stezowski, O., Lizarazo, C., Pérez-Vidal, R.M., Andreoiu, C., Angelis, G. De, Astier, A., Delafosse, C., Deloncle, I., Dombradi, Z., De France, G., Gadea, A., Gottardo, A., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Blanc, F. Le, Lenzi, S.M., Li, G., Lozeva, Radomira, Million, B., Napoli, D.R., Navin, A., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., Collado, J., Cullen, D.M., Désesquelles, P., Pardo, C. Domingo, González, V., Harkness-Brennan, L., Hess, H., Judson, D.S., Karolak, M., Korten, W., Labiche, M., Ljungvall, J., Menegazzo, R., Mengoni, D., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Theisen, Ch., Valiente-Dobon, J.J., Zielinska, M., Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, The support from the EuropeanUnion Seventh Framework Programme through ENSAR, Contract No. 262010., AGATA, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Expérience GANIL/AGATA/VAMOS++ Spectrometer; International audience; Prompt γ-ray spectroscopy of the neutron-rich $^{96}$Kr, produced in transfer- and fusion-induced fissionreactions, has been performed using the combination of the Advanced Gamma Tracking Array and theVAMOS++ spectrometer. A second excited state, assigned to $J^π$ = $4^+$, is observed for the first time, anda previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratioR4/2 = E($4^+$)/E($2^+$) = 2.12(1) indicates that this nucleus does not show a well-developed collectivitycontrary to that seen in heavier N = 60 isotones. This new measurement highlights an abrupt transition ofthe degree of collectivity as a function of the proton number at Z = 36, of similar amplitude to thatobserved at N = 60 at higher Z values. A possible reason for this abrupt transition could be related to theinsufficient proton excitations in the g9/2, d5/2, and s1/2 orbitals to generate strong quadrupole correlationsor to the coexistence of competing different shapes. An unexpected continuous decrease of R4/2 as a function of the neutron number up to N = 60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N = 60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N = 60 and Z = 36.

Published
2017
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36. Measurement of lifetimes in $^{62,64}$Fe, $^{61,63}$Co, and $^{59}$Mn

Author

Klintefjord, M., Ljungvall, J., Görgen, A., Lenzi, M., Bello Garrote, F., Blazhev, A., Clément, E., De France, G., Delaroche, P., Dewald, A., Doherty, D., Fransen, C., Gengelbach, A., Georgiev, G., Girod, M., Goasduff, A., Gottardo, A., Hadyńska-Klȩk, K., Jacquot, B., Désesquelles, P., Konstantinopoulos, T., Korichi, A., Lemasson, A., Libert, J., Lopez-Martens, A., Michelagnoli, C., Navin, A., Nyberg, J., Pérez-Vidal, R., Roccia, S., Sahin, E., Stefan, I., Stuchbery, E., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, A., Charles, L., Ciemala, M., Dudouet, J., Eberth, J., Gadea, A., González, V., Harkness-Brennan, L., Hess, H., Jungclaus, A., Korten, W., Menegazzo, R., Mengoni, D., Million, B., Pullia, A., Ralet, D., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente Dobon, J. J., 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AGATA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Expérience GANIL/AGATA/VAMOS++; International audience; Lifetimes of the 41+ states in 62,64Fe and the 11/21− states in 61,63Co and 59Mn were measured at the Grand Accélérateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U238 beam impinging on a Ni64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. The data show an increase of collectivity in the iron isotopes approaching N=40. The reduction of the subshell gap between the ν2p1/2 and ν1g9/2 orbitals leads to an increased population of the quasi-SU(3) pair (ν1g9/2,ν2d5/2), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes with N

Published
2017
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37. Lifetime Measurements Using RDDS Method in the Vicinity of $^{78}$Ni

Author

Delafosse, C., primary, Verney, D., additional, Gottardo, A., additional, Ibrahim, F., additional, Franchoo, S., additional, Matea, I., additional, Olivier, L., additional, Portail, C., additional, Clément, E., additional, Lemasson, A., additional, Michelagnoli, C., additional, Babo, M., additional, Jacquot, B., additional, Goasduff, A., additional, Napoli, D.R., additional, Ljungvall, J., additional, Korichi, A., additional, Georgiev, G., additional, Konstantinopoulos, T., additional, Lenzi, S.M., additional, Boso, A., additional, Mengoni, D., additional, Recchia, F., additional, Andreoiu, C., additional, Didierjean, F., additional, Dudouet, J., additional, Maquart, G., additional, Redon, N., additional, Stezowski, O., additional, Gadea, A., additional, Pérez-Vidal, R.M., additional, and Zielińska, M., additional

Published
2019
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38. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Author

Delafosse, C., primary, Verney, D., additional, Marević, P., additional, Gottardo, A., additional, Michelagnoli, C., additional, Lemasson, A., additional, Goasduff, A., additional, Ljungvall, J., additional, Clément, E., additional, Korichi, A., additional, De Angelis, G., additional, Andreoiu, C., additional, Babo, M., additional, Boso, A., additional, Didierjean, F., additional, Dudouet, J., additional, Franchoo, S., additional, Gadea, A., additional, Georgiev, G., additional, Ibrahim, F., additional, Jacquot, B., additional, Konstantinopoulos, T., additional, Lenzi, S. M., additional, Maquart, G., additional, Matea, I., additional, Mengoni, D., additional, Napoli, D. R., additional, Nikšić, T., additional, Olivier, L., additional, Pérez-Vidal, R. M., additional, Portail, C., additional, Recchia, F., additional, Redon, N., additional, Siciliano, M., additional, Stefan, I., additional, Stezowski, O., additional, Vretenar, D., additional, Zielinska, M., additional, Barrientos, D., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Cederwall, B., additional, Charles, L., additional, Ciemala, M., additional, Collado, J., additional, Cullen, D. M., additional, Désesquelles, P., additional, de France, G., additional, Domingo-Pardo, C., additional, Eberth, J., additional, González, V., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Korten, W., additional, Lefevre, A., additional, Legruel, F., additional, Menegazzo, R., additional, Million, B., additional, Nyberg, J., additional, Quintana, B., additional, Ralet, D., additional, Reiter, P., additional, Saillant, F., additional, Sanchis, E., additional, Theisen, Ch., additional, and Valiente Dobon, J. J., additional

Published
2018
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39. Measurement of lifetimes in Fe-62,Fe-64, Co-61,Co-63, and Mn-59

Author

Klintefjord, M., Ljungvall, J., Gorgen, A., Lenzi, S. M., Garrote, F. L. Bello, Blazhev, A., Clement, E., de France, G., Delaroche, J. -P, Desesquelles, P., Dewald, A., Doherty, D. T., Fransen, C., Gengelbach, Aila, Georgiev, G., Girod, M., Goasduff, A., Gottardo, A., Hadynska-Klek, K., Jacquot, B., Konstantinopoulos, T., Korichi, A., Lemasson, A., Libert, J., Lopez-Martens, A., Michelagnoli, C., Navin, A., Nyberg, Johan, Perez-Vidal, R. M., Roccia, S., Sahin, E., Stefan, I., Stuchbery, A. E., Zielinska, M., Barrientos, D., Birkenbach, B., Boston, A., Charles, L., Ciemala, M., Dudouet, J., Eberth, J., Gadea, A., Gonzalez, V., Harkness-Brennan, L., Hess, H., Jungclaus, A., Korten, W., Menegazzo, R., Mengoni, D., Million, B., Pullia, A., Ralet, D., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, Ch., and Dobon, J. J. Valiente

Subjects
Atom and Molecular Physics and Optics, Atom- och molekylfysik och optik
Abstract

Lifetimes of the 4(1)(+) states in Fe-62,Fe-64 and the 11/2(1)(-) states in Co-61,Co-63 and Mn-59 were measured at the Grand Accelerateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U-238 beam impinging on a Ni-64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. The data show an increase of collectivity in the iron isotopes approaching N = 40. The reduction of the subshell gap between the nu 2p(1/2) and nu 1g(9/2) orbitals leads to an increased population of the quasi-SU(3) pair (nu 1g(9/2), nu 2d(5/2)), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes withN < 40 for which the neutron subshell gap is larger due to the repulsive monopole component of the tensor nucleon-nucleon interaction. The extracted experimental B(E2) values are compared with large-scale shell-model calculations and with beyond-mean-field calculations with the Gogny D1S interaction. A good agreement between calculations and experimental values is found, and the results demonstrate in particular the spectroscopic quality of the Lenzi, Nowacki, Poves, and Sieja (LNPS) shell-model interaction.

Published
2017

40. EXILL - a high efficiency, high resolution setup for γ-spectroscopy at an intense cold neutron beam

Author

Jentschel, M., Blanca, A., France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astieri, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka, N., Clement, E., Cooper, N., Crespic, F., Csatlos, M., Czerwinski, M., Danu, L., Davies, A., Didierjean, F., Drouet, F., Duchene, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B., John, R., Jolie, J., Kisyov, S., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kutiu, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Magron, C., Mancuso, C., Ruiz Martinez, E., Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsacq, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timaru, J., Toml, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
235U, Ge detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, neutron-induced fission, multiple-γ coincidences, (n,γ)-reactions, 241Pu, angular correlations
Abstract

In the EXILL campaign a highly efficient array of HPGe detectors was operated at the cold neutron beam instrument PF1B of the Institut Laue-Langevin to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 s-1 cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two smaller clover detectors. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The trigger-less acquisition system allowed an event collection rate of up to 6 × 105 Hz. From triggerless collected data it was possible to construct decay schemes and in combination with the FATIMA array of LaBr3 detectors to analyze half-lives of excited levels in the pico- to micro-second range. Precise energy and efficiency calibrations of EXILL were performed using 27Al(n,γ)28Al and 35Cl(n,γ)36Cl reactions in the energy range from 30 keV up to 10 MeV.

Published
2017

41. Lifetime measurements in Ru 100

Author

Konstantinopoulos, T. Petkov, P. Goasduff, A. Arici, T. Astier, A. Atanasova, L. Axiotis, M. Bonatsos, D. Detistov, P. Dewald, A. Eller, M.J. Foteinou, V. Gargano, A. Georgiev, G. Gladnishki, K. Gottardo, A. Harissopulos, S. Hess, H. Kaim, S. Kocheva, D. Kusoglu, A. Lagoyannis, A. Ljungvall, J. Lutter, R. Matea, I. Melon, B. Mertzimekis, T.J. Nannini, A. Petrache, C.M. Petrovici, A. Provatas, G. Reiter, P. Rocchini, M. Roccia, S. Seidlitz, M. Siebeck, B. Suzuki, D. Warr, N. De Witte, H. Zerrouki, T.

Abstract

The nucleus Ru100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2+, 4+, and 8+ states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations. © 2017 American Physical Society.

Published
2017

42. Measurement of lifetimes in Fe62,64,Co61,63, and Mn59

Author

Klintefjord, M., Ljungvall, J., Görgen, A., Lenzi, SILVIA MONICA, Bello Garrote, F. L., Blazhev, A., Clément, E., de France, G., Delaroche, J. P., Désesquelles, P., Dewald, A., Doherty, D. T., Fransen, C., Gengelbach, A., Georgiev, G., Girod, M., Goasduff, Alain, Gottardo, Andrea, Hadyńska Klȩk, K., Jacquot, B., Konstantinopoulos, T., Korichi, A., Lemasson, A., Libert, J., Lopez Martens, A., Michelagnoli, Caterina, Navin, A., Nyberg, J., Pérez Vidal, R. M., Roccia, S., Sahin, E., Stefan, I., Stuchbery, A. E., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, A., Charles, L., Ciemala, M., Dudouet, J., Eberth, J., Gadea, A., González, V., Harkness Brennan, L., Hess, H., Jungclaus, A., Korten, W., Menegazzo, R., Mengoni, Daniele, Million, B., Pullia, A., Ralet, D., Recchia, Francesco, Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, C. h., and Valiente Dobon, J. J.

Published
2017

43. 96Kr-Low-Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J, Lemasson, A, Duchêne, G, Rejmund, M, Clément, E, Michelagnoli, Caterina, Didierjean, F, Korichi, A, Maquart, G, Stezowski, O, Lizarazo, C, Pérez Vidal, R. M, Andreoiu, C, de Angelis, G, Astier, A, Delafosse, C, Deloncle, I, Dombradi, Z, de France, G, Gadea, A, Gottardo, Andrea, Jacquot, B, Jones, P, Konstantinopoulos, T, Kuti, I, Le Blanc, F, Lenzi, SILVIA MONICA, Li, G, Lozeva, R, Million, B, Napoli, D. R, Navin, A, Petrache, C. M, Pietralla, N, Ralet, D, Ramdhane, M, Redon, N, Schmitt, C, Sohler, D, Verney, D, Barrientos, D, Birkenbach, B, Burrows, I, Charles, L, Collado, J, Cullen, D. M, Désesquelles, P, Domingo Pardo, C, González, V, Harkness Brennan, L, Hess, H, Judson, D. S, Karolak, M, Korten, W, Labiche, M, Ljungvall, J, Menegazzo, R, Mengoni, Daniele, Pullia, A, Recchia, Francesco, Reiter, P, Salsac, M. D, Sanchis, E, Theisen, Ch, Valiente Dobón, J. J, and Zielińska, M.

Published
2017

44. Lifetime measurements in $^{100}$Ru

Author

Konstantinopoulos, T., Petkov, P., Goasduff, A., Arici, T., Astier, A., Atanasova, L., Axiotis, M., Bonatsos, D., Detistov, P., Dewald, A., Eller, M.J., Foteinou, V., Gargano, A., Georgiev, G., Gladnishki, K., Gottardo, A., Harissopulos, S., Hess, H., Kaim, S., Kocheva, D., Kusoglu, A., Lagoyannis, A., Ljungvall, J., Lutter, R., Matea, I., Melon, B., Mertzimekis, T.J., Nannini, A., Petrache, C.M., Petrovici, A., Provatas, G., Reiter, P., Rocchini, M., Roccia, S., Seidlitz, M., Siebeck, B., Suzuki, D., Warr, N., De Witte, H., Zerrouki, T., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The nucleus Ru100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2+, 4+, and 8+ states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations.

Published
2017
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45. STUDY OF OCTUPOLE COLLECTIVITY IN Nd-146 AND Sm-148 USING THE NEW COULOMB EXCITATION SET-UP AT ALTO

Author

Komorowska, M, Zielinska, M, Napiorkowski, P, Doherty, T, Wrzosek-Lipska, Kasia, Butler, PA, Prochniak, L, Korten, W, Briselet, R, De Witte, Hilde, Gaffney, Liam, Georgiev, G, Goasduff, A, Gorgen, A, Gottardo, A, Gregor, ET, Hadynska-Klek, K, Hess, H, Klintefjord, M, Konstantinopoulos, T, Ljungvall, J, Lutter, R, Matea, I, Matuszczak, P, O'Neill, GG, Piatek, W, Reiter, P, Rosiak, D, Scheck, M, Seidlitz, M, Siebeck, B, Thuerauf, M, and Warr, N

Subjects
Nuclear Theory
Abstract

For certain combinations of protons and neutrons in atomic nuclei, a rise of a reflection asymmetry is expected. Experimental E3 strengths, which as a function of the neutron number peak at around N ≈ 88 and N ≈ 134, indicate enhanced octupole correlations as predicted by theory. Low-energy Coulomb excitation is a highly successful method for establishing the evolution of nuclear shapes, through the measurement of cross sections, to populate excited states that can be directly related to the static and dynamic moments of the charge distribution of the nucleus. A Coulomb excitation experiment at the ALTO facility, Orsay was performed recently to study collective properties of 146Nd and 148Sm. In particular, the strengths of the ⟨3−||E3||0+⟩ and ⟨1−||E3||4+⟩ matrix elements will provide a clear distinction between octupole vibration and rigid deformation. ispartof: Acta Physica Polonica B vol:47 issue:3 pages:923-928 status: published

Published
2016

46. Lifetime measurements in Pd-102: Searching for empirical proof of the E(5) critical-point symmetry in nuclear structure

Author

Konstantinopoulos, T., Ashley, S. F., Axiotis, M., Spyrou, A., Harissopulos, S., Dewald, A., Litzinger, J., Möller, O., Müller Gatterman, C., Petkov, P., Napoli, D. R., Marginean, N., De Angelis, G., C. A., Ur, Bazzacco, D., Farnea, E., Lenzi, SILVIA MONICA, Vlastou, R., Balabanski, D., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Institute of Nuclear and Particle Physics, NCRS Demokritos, and National Centre for Scientific Research 'Demokritos'

Subjects
[PHYS]Physics [physics], Nuclear and High Energy Physics, STATES, DECAY CURVE METHOD, EVEN-EVEN NUCLEI, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LIMIT
Abstract

International audience; Lifetimes of yrast and nonyrast states of Pd-102 populated via the Zr-92(C-13, 3n) reaction are measured by means of the recoil distance Doppler-shift technique with a Cologne plunger coupled to a GASP spectrometer. The event-by-event data accumulated at 24 plunger distances in the range of 0.1 mu m to 9 mm are analyzed using the differential decay curve method. The resulting B(E2) values of the gamma transitions depopulating yrast-band members up to the I-pi = 8(+) state are found to deviate significantly from the corresponding predictions of the E(5) critical-point symmetry.

Published
2016
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47. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., primary, Blanc, A., additional, de France, G., additional, Köster, U., additional, Leoni, S., additional, Mutti, P., additional, Simpson, G., additional, Soldner, T., additional, Ur, C., additional, Urban, W., additional, Ahmed, S., additional, Astier, A., additional, Augey, L., additional, Back, T., additional, Ba̧czyk, P., additional, Bajoga, A., additional, Balabanski, D., additional, Belgya, T., additional, Benzoni, G., additional, Bernards, C., additional, Biswas, D.C., additional, Bocchi, G., additional, Bottoni, S., additional, Britton, R., additional, Bruyneel, B., additional, Burnett, J., additional, Cakirli, R.B., additional, Carroll, R., additional, Catford, W., additional, Cederwall, B., additional, Celikovic, I., additional, Cieplicka-Oryńczak, N., additional, Clement, E., additional, Cooper, N., additional, Crespi, F., additional, Csatlos, M., additional, Curien, D., additional, Czerwiński, M., additional, Danu, L.S., additional, Davies, A., additional, Didierjean, F., additional, Drouet, F., additional, Duchêne, G., additional, Ducoin, C., additional, Eberhardt, K., additional, Erturk, S., additional, Fraile, L.M., additional, Gottardo, A., additional, Grente, L., additional, Grocutt, L., additional, Guerrero, C., additional, Guinet, D., additional, Hartig, A.-L., additional, Henrich, C., additional, Ignatov, A., additional, Ilieva, S., additional, Ivanova, D., additional, John, B.V., additional, John, R., additional, Jolie, J., additional, Kisyov, S., additional, Krticka, M., additional, Konstantinopoulos, T., additional, Korgul, A., additional, Krasznahorkay, A., additional, Kröll, T., additional, Kurpeta, J., additional, Kuti, I., additional, Lalkovski, S., additional, Larijani, C., additional, Leguillon, R., additional, Lica, R., additional, Litaize, O., additional, Lozeva, R., additional, Magron, C., additional, Mancuso, C., additional, Martinez, E. Ruiz, additional, Massarczyk, R., additional, Mazzocchi, C., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Mokry, C., additional, Mukhopadhyay, S., additional, Mulholland, K., additional, Nannini, A., additional, Napoli, D.R., additional, Olaizola, B., additional, Orlandi, R., additional, Patel, Z., additional, Paziy, V., additional, Petrache, C., additional, Pfeiffer, M., additional, Pietralla, N., additional, Podolyak, Z., additional, Ramdhane, M., additional, Redon, N., additional, Regan, P., additional, Regis, J.M., additional, Regnier, D., additional, Oliver, R. J., additional, Rudigier, M., additional, Runke, J., additional, Rza̧ca-Urban, T., additional, Saed-Samii, N., additional, Salsac, M.D., additional, Scheck, M., additional, Schwengner, R., additional, Sengele, L., additional, Singh, P., additional, Smith, J., additional, Stezowski, O., additional, Szpak, B., additional, Thomas, T., additional, Thürauf, M., additional, Timar, J., additional, Tom, A., additional, Tomandl, I., additional, Tornyi, T., additional, Townsley, C., additional, Tuerler, A., additional, Valenta, S., additional, Vancraeyenest, A., additional, Vandone, V., additional, Vanhoy, J., additional, Vedia, V., additional, Warr, N., additional, Werner, V., additional, Wilmsen, D., additional, Wilson, E., additional, Zerrouki, T., additional, and Zielinska, M., additional

Published
2017
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48. Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Author

Wilson, J. N., primary, Lebois, M., additional, Qi, L., additional, Amador-Celdran, P., additional, Bleuel, D., additional, Briz, J. A., additional, Carroll, R., additional, Catford, W., additional, De Witte, H., additional, Doherty, D. T., additional, Eloirdi, R., additional, Georgiev, G., additional, Gottardo, A., additional, Goasduff, A., additional, Hadyńska-Klęk, K., additional, Hauschild, K., additional, Hess, H., additional, Ingeberg, V., additional, Konstantinopoulos, T., additional, Ljungvall, J., additional, Lopez-Martens, A., additional, Lorusso, G., additional, Lozeva, R., additional, Lutter, R., additional, Marini, P., additional, Matea, I., additional, Materna, T., additional, Mathieu, L., additional, Oberstedt, A., additional, Oberstedt, S., additional, Panebianco, S., additional, Podolyák, Zs., additional, Porta, A., additional, Regan, P. H., additional, Reiter, P., additional, Rezynkina, K., additional, Rose, S. J., additional, Sahin, E., additional, Seidlitz, M., additional, Serot, O., additional, Shearman, R., additional, Siebeck, B., additional, Siem, S., additional, Smith, A. G., additional, Tveten, G. M., additional, Verney, D., additional, Warr, N., additional, Zeiser, F., additional, and Zielinska, M., additional

Published
2017
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49. Toward lifetime andgfactor measurements of short-lived states in the vicinity of208Pb

Author

Ralet, D, primary, Georgiev, G, additional, Stuchbery, A E, additional, Clément, E, additional, Lemasson, A, additional, Michelagnoli, C, additional, Rejmund, M, additional, Atanasova, L, additional, Balabanski, D L, additional, Bocchi, G, additional, Carroll, R, additional, Dewald, A, additional, Dudouet, J, additional, Fornal, B, additional, France, G de, additional, Franchoo, S, additional, Fransen, C, additional, Müller-Gatermann, C, additional, Goasduff, A, additional, Gadea, A, additional, Jacquot, B, additional, John, P R, additional, Kocheva, D, additional, Konstantinopoulos, T, additional, Korichi, A, additional, Kusoglu, A, additional, Lenzi, S M, additional, Leoni, S, additional, Ljungvall, J, additional, Lozeva, R, additional, Maj, A, additional, Navin, A, additional, Perez, R, additional, Pietralla, N, additional, Shand, C, additional, Stezowski, O, additional, and Yordanov, D, additional

Published
2017
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50. Kr369660 –Low- Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., primary, Lemasson, A., additional, Duchêne, G., additional, Rejmund, M., additional, Clément, E., additional, Michelagnoli, C., additional, Didierjean, F., additional, Korichi, A., additional, Maquart, G., additional, Stezowski, O., additional, Lizarazo, C., additional, Pérez-Vidal, R. M., additional, Andreoiu, C., additional, de Angelis, G., additional, Astier, A., additional, Delafosse, C., additional, Deloncle, I., additional, Dombradi, Z., additional, de France, G., additional, Gadea, A., additional, Gottardo, A., additional, Jacquot, B., additional, Jones, P., additional, Konstantinopoulos, T., additional, Kuti, I., additional, Le Blanc, F., additional, Lenzi, S. M., additional, Li, G., additional, Lozeva, R., additional, Million, B., additional, Napoli, D. R., additional, Navin, A., additional, Petrache, C. M., additional, Pietralla, N., additional, Ralet, D., additional, Ramdhane, M., additional, Redon, N., additional, Schmitt, C., additional, Sohler, D., additional, Verney, D., additional, Barrientos, D., additional, Birkenbach, B., additional, Burrows, I., additional, Charles, L., additional, Collado, J., additional, Cullen, D. M., additional, Désesquelles, P., additional, Domingo Pardo, C., additional, González, V., additional, Harkness-Brennan, L., additional, Hess, H., additional, Judson, D. S., additional, Karolak, M., additional, Korten, W., additional, Labiche, M., additional, Ljungvall, J., additional, Menegazzo, R., additional, Mengoni, D., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Salsac, M. D., additional, Sanchis, E., additional, Theisen, Ch., additional, Valiente-Dobón, J. J., additional, and Zielińska, M., additional

Published
2017
Full Text
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