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1. Detailed $\alpha$-decay study of $^{180}\mathrm{Tl}$

Author

Andel, B., Andreyev, A.N., Antalic, S., Barzakh, A., Bree, N., Cocolios, T.E., Comas, V.F., Diriken, J., Elseviers, J., Fedorov, D.V., Fedosseev, V.N., Franchoo, S., Ghys, L., Heredia, J.A., Huyse, M., Ivanov, O., Köster, U., Liberati, V., Marsh, B.A., Nishio, K., Page, R.D., Patronis, N., Seliverstov, M.D., Tsekhanovich, I., Van Den Bergh, P., Van De Walle, J., Van Duppen, P., Venhart, M., Vermote, S., Veselský, M., Wagemans, C., 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), Institut Laue-Langevin (ILL), ILL, 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), and 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)

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

International audience; A detailed $\alpha$-decay spectroscopy study of $^{180}\mathrm{Tl}$ has been performed at ISOLDE (CERN). $Z$-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of $^{180}\mathrm{Tl}$. Fine-structure $\alpha$ decays to excited levels in the daughter $^{176}\mathrm{Au}$ were identified and an $\alpha$-decay scheme of $^{180}\mathrm{Tl}$ was constructed based on an analysis of $\alpha$-$\gamma$ and $\alpha$-$\gamma$-$\gamma$ coincidences. Multipolarities of several $\gamma$-ray transitions deexciting levels in $^{176}\mathrm{Au}$ were determined. Based on the analysis of reduced $\alpha$-decay widths, it was found that all $\alpha$ decays are hindered, which signifies a change of configuration between the parent and all daughter states.

Published
2017
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2. Low-energy Coulomb excitation of $^{96,98}$Sr beams

Author

Clément, E., Zielinska, M., Péru, S., Goutte, H., Hilaire, S., Görgen, A., Korten, W., Doherty, D., Bastin, B., Bauer, C., Blazhev, A., Bree, N., Bruyneel, B., Butler, A., Butterworth, J., Cederkäll, J., Delahaye, P., Dijon, A., Ekström, A., Fitzpatrick, C., Fransen, C., Georgiev, G., Gernhäuser, R., Hess, H., Iwanicki, J., Jenkins, D., Larsen, A., Ljungvall, J., Lutter, R., Marley, P., Moschner, K., Napiorkowski, J., Pakarinen, J., Petts, A., Reiter, P., Renstrøm, T., Seidlitz, M., Siebeck, B., Siem, S., Sotty, C., Srebrny, J., Stefanescu, I., Tveten, M., Van De Walle, J., Vermeulen, M., Voulot, D., Warr, N., Wenander, F., Wiens, A., De Witte, H., Wrzosek-Lipska, K., 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), REX-ISOLDE, 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), and 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)

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

International audience; The structure of neutron-rich 96,98Sr nuclei was investigated by low-energy safe Coulomb excitation ofradioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set oftransitional and diagonal E2 matrix elements, including those for non-yrast structures, has been extractedfrom the differential Coulomb-excitation cross sections. The results support the scenario of a shape transition atN = 60, giving rise to the coexistence of a highly deformed prolate and a spherical configuration in 98Sr, andare compared to predictions from several theoretical calculations. The experimental data suggest a significantcontribution of the triaxal degree of freedom in the ground state of both isotopes. In addition, experimentalinformation on low-lying states in 98Rb has been obtained.

Published
2016
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3. Spectroscopic Quadrupole Moments in $^{96;98}$Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N = 60

Author

Clément, E., Zielińska, M., Görgen, A., Korten, W., Péru, S., Libert, J., Goutte, H., Hilaire, S., Bastin, B., Bauer, C., Blazhev, A., Bree, N., Bruyneel, B., Butler, P. A., Butterworth, J., Delahaye, P., Dijon, A., Doherty, D. T., Ekström, A., Fitzpatrick, C., Fransen, C., Georgiev, G., Gernhäuser, R., Hess, H., Iwanicki, J., Jenkins, D.G., Larsen, A.C., Ljungvall, J., Lutter, R., Marley, P., Moschner, K., Napiorkowski, P. J., Pakarinen, J., Petts, A., Reiter, P., Renstrøm, T., Seidlitz, M., Siebeck, B., Siem, S., Sotty, C., Srebrny, J., Stefanescu, I., Tveten, G.M., Walle, J. Van De, Vermeulen, M., Voulot, D., Warr, N., Wenander, F., Wiens, A., Witte, H. De, Wrzosek-Lipska, K., 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), 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, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud

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

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.; International audience; Neutron-rich $^{96,98}$Sr isotopes have been investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross sections. These results allow, for the first time, the drawing of definite conclusions about the shape coexistence of highly deformed prolate and spherical configurations. In particular, a very small mixing between the coexisting states is observed, contrary to other mass regions where strong mixing is present. Experimental results have been compared to beyond-mean-field calculations using the Gogny D1S interaction in a five-dimensional collective Hamiltonian formalism, which reproduce the shape change at N=60.

Published
2016
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4. Rb379760: The Cornerstone of the Region of Deformation around A∼100

Author

Sotty, C., Zielińska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, Rémy, Das Gupta, S., Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadyńska-Klȩk, K., Kondev, F. G., Konki, J., Kröll, T., Morel, Pierre, Napiorkowski, P., Pakarinen, J., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Törnqvist, H., Warr, N., Wenander, F., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; Excited states of the neutron-rich nuclei Rb97,99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb97 as being built on the πg9/2 [431] 3/2+ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of Rb97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015
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5. β-delayed fission of 180Tl

Author

Elseviers, J., Andreyev, A. N., Fedorov, D., Fedosseev, V. N., Franchoo, S., Ghys, L., Heredia, J. A., Ivanov, O., Köster, U., Marsh, B. A., Nishio, K., Page, R. D., Huyse, M., Patronis, N., Seliverstov, M. D., Tsekhanovich, I., Van den Bergh, P., Van De Walle, J., Venhart, M., Vermote, S., Veselský, M., Wagemans, C., Van Duppen, P., Antalic, S., Barzakh, A., Bree, N., Cocolios, T. E., Comas, V. F., Diriken, J., 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), Institut Laue-Langevin (ILL), ILL, Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Aval du cycle et Energie Nucléaire (ACEN), 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)-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), and European Organization for Nuclear Research (CERN)

Subjects
Isolde, SURFACE-BARRIER DETECTORS, Physics and Astronomy, fission, ddc:530, fission fragment mass distribution, NUCLEAR-FISSION, MASS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, FRAGMENTS, HEAVY-IONS
Abstract

The detailed analysis of the beta-delayed fission data of Tl-180 is presented. The experiment was performed by producing a pure beam of Tl-180 by means of highly selective resonance laser ionization followed by mass separation with the ISOLDE (CERN, Geneva) isotope separator. A surprising asymmetric mass distribution of fission fragments from Hg-180, the daughter of Tl-180 beta decays, was observed. Here, the energy calibration of the silicon detectors, which is crucial for a proper determination of the fission fragments' energy and mass split, is presented and the total kinetic energy and its dependence on the mass split ratio is discussed. A more precise beta-delayed fission probability P-beta DF(Tl-180) = 3.2(2) x 10(-3)% was deduced.

Published
2013
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6. α-decay spectroscopy of the chain 179Tlg→175Aug→171Irg→167Rem

Author

N. Andreyev, A., Liberati, V., Antalic, S., Ackermann, D., Barzakh, A., Bree, N., E. Cocolios, T., Diriken, J., Elseviers, J., Fedorov, D., N. Fedosseev, V., Fink, D., Franchoo, S., Heinz, S., P. Heßberger, F., Hofmann, S., Huyse, M., Ivanov, O., Khuyagbaatar, J., Kindler, B., Köster, U., F. W. Lane, J., Lommel, B., Mann, R., Marsh, B., Molkanov, P., Nishio, K., D. Page, R., Patronis, N., Pauwels, D., Radulov, D., Seliverstov, M., Sjödin, M., Tsekhanovich, I., Van Den Bergh, P., Van Duppen, P., Venhart, M., Veselský, M., 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

Detailed α-decay studies of 179Tlg and its daughter products 175Aug and 171Irg were carried out in two complementary experiments at the mass separator ISOLDE (CERN) and velocity filter SHIP (GSI). First unambiguous determination of the α-decay properties of 175Aug was performed as follows: Eα = 6433(4) keV, T1/2 = 207(7) ms, and α-decay branching ratio 90(7)%. First determination of the α-decay branching ratios for 179Tlg and 171Irg was also made: bα(179Tlg) = 60(2)% and bα(171Irg) = 15(2)%. The spins of the ground states in 175Au and 171Ir are established as 1/2+.

Published
2013
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7. Coulomb excitation of odd-A neutron-rich Rb isotopes at REX-ISOLDE. Nuclear structure studies at the r-process path

Author

Georgiev, G., Sotty, C., Geibel, K., Hadynska-Klek, K., Kröll, T., Lannoo, B., Morel, Pierre, Napiorkowski, P., Pakarinen, J., Scheck, M., Simpson, G., Siebeck, B., Stuchbery, A.E., Warr, N., Wenander, F., Zielinska, M., Daugas, J.-M., Blazhev, A., Bree, N., Chevrier, Rémy, Das Gupta, S., Diriken, J., Gaffney, L., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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), 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), 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), and Vernay, Emmanuelle

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2011

8. Combined in-beam electron and gamma-ray spectroscopy of Hg-184,Hg-186

Author

Scheck, M., A. Butler, P., P. Gaffney, L., Bree, N., J. Carrol, R., Cox, D., Grahn, T., T. Greenlees, P., Hauschild, K., Herzan, A., Huyse, M., Jakobsson, U., Jones, P., T. Joss, D., Julin, R., Juutinen, S., Ketelhut, S., Herzberg, R.-D., Kowalczyk, M., C. Larsen, A., Leino, M., Lopez-Martens, A., Nieminen, P., D. Page, R., Pakarinen, J., Papadakis, P., Peura, P., Rahkila, P., Rinta-Antila, S., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Srebrny, J., Van Duppen, P., V. Watkins, H., Uusitalo, J., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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
COEXISTENCE, NUCLEI, ISOTOPES, MERCURY, HG-184, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], HG, PB, TRANSITION, INTRUDER STATES, PB-186
Abstract

By exploiting the SAGE spectrometer a simultaneous measurement of conversion electrons and gamma rays emitted in the de-excitation of excited levels in the neutron-deficient nuclei Hg-184,Hg-186 was performed. The light Hg isotopes under investigation were produced using the 4n channels of the fusion-evaporation reactions of Ar-40 and Sm-148,Sm-150. The measured K- and L-conversion electron ratios confirmed the stretched E2 nature of several transitions of the yrast bands in Hg-184,Hg-186. Additional information on the E0 component of the 2(2)(+) -> 2(1)(+) transition in Hg-186 was obtained.

Published
2011
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9. Coulomb excitation of the 3(-) isomer in (70)Cu

Author

Rapisarda, E., Stefanescu, I., L. Balabanski, D., Bastin, B., Blazhev, A., Bree, N., Danchev, M., Bruyneel, B., Davinson, T., Delahaye, P., Diriken, J., Eberth, J., Georgiev, G., Fedorov, D., N. Fedosseev, V., Fiori, E., Franchoo, S., Fransen, C., Geibel, K., Gladnishki, K., Hadynska, K., Hess, H., Heyde, K., Huyse, M., Ivanov, O., Iwanicki, J., Jolie, J., Kalkuehler, M., Kroll, T., Krucken, R., Koster, U., Lo Bianco, G., Lozeva, Radomira, A. Marsh, B., Nardelli, S., Nowacki, F., Patronis, N., Reiter, P., Seidlitz, M., Sieja, K., Smirnova, N., Srebrny, J., Van De Walle, J., Van Duppen, P., Warr, N., Wenander, F., Wimmer, K., Wrzosek, K., Zemlyanoi, S., Zielinska, M., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 de Physique Nucléaire d'Orsay (IPNO), 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), Physique théorique (THEORIE), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)-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)

Subjects
separation, detector, cu-66, SEPARATION, CU-66, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], DETECTOR
Abstract

Post-accelerated isomerically purified radioactive beams, available at the CERN On-Line Isotope Mass Separator facility using the resonant ionization laser technique, have been used to study the Coulomb excitation of the I(pi) = 3(-) state in (70)Cu (Z = 29, N = 41). While first results using a I(pi) = 6(-) beam were reported previously, the present complementary experiment allows us to complete the study of the multiplet of states (3(-), 4(-), 5(-), 6(-)) arising from the pi 2p(3)/(2)nu 1g(9/2) configuration. Besides the known gamma-ray transition deexciting the 4(-) state, a ground-state. ray of 511(3) keV was observed for the first time and was unambiguously associated with the 5(-) state deexcitation. This observation fixes the energy, spin, and parity of this state, completing the low-energy level scheme of (70)Cu. B(E2) values for all possible E2 transitions within the multiplet were determined. A comparison with large-scale shell model calculations using different interactions and valence spaces shows the importance of proton excitation across the Z = 28 shell gap and the role of the 2d(5/2) neutron orbital. Physical Review C

Published
2011
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10. Single particle character around $^{68}$Ni: the study of $^{66}$Ni(d,p)$^{67}$Ni at REX-ISOLDE

Author

Patronis, N., Bildstein, V., Bree, N., Diriken, J., Gernhâuser, R., Huyse, M., Kröll, T., Krücken, R., Mahgoup, M., Maierbeck, P., Raabe, R., van de Walle, J., van Duppen, P., 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), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2008

11. Interplay between Single-Particle and Collective Effects in the Odd-A Cu Isotopes beyond N=40

Author

Stefanescu, I., Georgiev, G., Balabanski, D. L., Blasi, N., Blazhev, A., Bree, N., Cederk?ll, J., Cocolios, T. E., Davinson, T., Diriken, J., Eberth, J., Ekstr?m, A., Fedorov, D., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Gladnishki, K., Huyse, M., Ivanov, O., Ivanov, V., Iwanicki, J., Jolie, J., Konstantinopoulos, T., Kr?ll, Th, Kr?cken, R., K?ster, U., Lagoyannis, A., Lo Bianco, G., Maierbeck, P., Marsh, B. A., Napiorkowski, P., Patronis, N., Pauwels, D., Rainovski, G., Reiter, P., Riisager, K., Seliverstov, M., Sletten, G., Van de Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., Wrzosek, K., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.70.De, 21.10.Ky, 21.60.Cs, 27.50.+e
Abstract

Collective properties of the low-lying levels in the odd-A 67-73Cu were investigated by Coulomb excitation with radioactive beams. The beams were produced at ISOLDE and postaccelerated by REX-ISOLDE up to 2.99 MeV/u. In 67,69Cu, low-lying 1/2(-), 5/2(-), and 7/2(-) states were populated. In 71,73Cu, besides the known transitions deexciting the single-particle-like 5/2(-) and core-coupled 7/2(-) levels, gamma rays of 454 and 135 keV, respectively, were observed for the first time. Based on a reanalysis of beta-decay work and comparison with the systematics, a spin 1/2(-) is suggested for these excited states. Three B(E2) values were determined in each of the four isotopes. The results indicate a significant change in the structure of the odd-A Cu isotopes beyond N=40 where single-particle-like and collective levels are suggested to coexist at very low excitation energies.

Published
2008
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12. Coulomb excitation of $^{68}$Ni at safe energies

Author

Bree, N., Stefanescu, I., Butler, P. A., Cederkäll, J., Davinson, T., Delahaye, P., Eberth, J., Fedorov, D., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Georgiev, G., Gladnishki, K., Huyse, M., Ivanov, O., Iwanicki, J., Jolie, J., Köster, U., Kröll, Th., Krücken, R., Marsh, B. A., Niedermaier, O., Reiter, P., Scheit, H., Schwalm, D., Sieber, T., Van de Walle, J., Van Duppen, P., Warr, N., Weisshaar, D., Wenander, F., Zemlyanoy, S., 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), 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)

Subjects
FOS: Physical sciences, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The $B(E2;0^+\to2^+)$ value in $^{68}$Ni has been measured using Coulomb excitation at safe energies. The $^{68}$Ni radioactive beam was post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted $\gamma$ rays were detected by the MINIBALL detector array. A kinematic particle reconstruction was performed in order to increase the measured c.m. angular range of the excitation cross section. The obtained value of 2.8$^{+1.2}_{-1.0}$ 10$^2$ e$^2$fm$^4$ is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low $0^+\to2^+$ transition probability., Comment: 4 pages, 5 figures

Published
2008
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13. Coulomb excitation of 2868Ni40 at 'safe' energies

Author

Bree, N., Stefanescu, I., A. Butler, P., Cederkäll, J., Davinson, T., Delahaye, P., Eberth, J., Fedorov, D., N. Fedosseev, V., M. Fraile, L., Franchoo, S., Georgiev, G., Gladnishki, K., Huyse, M., Ivanov, O., Iwanicki, J., Jolie, J., Köster, U., Kröll, Th., Krücken, R., A. Marsh, B., Niedermaier, O., Reiter, P., Scheit, H., Schwalm, D., Sieber, T., Van De Walle, J., Van Duppen, P., Warr, N., Weisshaar, D., Wenander, F., Zemlyanoy, S., Institut de Physique Nucléaire d'Orsay (IPNO), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 Laue-Langevin (ILL), and ILL

Subjects
Astrophysics::High Energy Astrophysical Phenomena, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Nuclear Experiment
Abstract

The B(E2;0+-->2+) value in 68Ni has been measured using Coulomb excitation at safe energies. The 68Ni radioactive beam was postaccelerated at the CERN on-line isotope mass separator (ISOLDE) facility to 2.9 MeV/u and directed to a 108Pd target. The emitted gamma rays were detected by the MINIBALL detector array. Not only directly registered but also indirectly deduced information on the nucleus emitting the gamma ray was used to perform the Doppler correction, leading to a larger center-of-mass angular range to infer the excitation cross section. The obtained value of 2.8-1.0+1.2×102e2 fm4 is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low 0+-->2+ transition probability.

Published
2008
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