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331 results on '"M. Lewitowicz"'

1. The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

H. Grawe, K. Straub, T. Faestermann, M. Górska, C. Hinke, R. Krücken, F. Nowacki, M. Böhmer, P. Boutachkov, H. Geissel, R. Gernhäuser, A. Gottardo, J. Grȩbosz, N. Kurz, Z. Liu, L. Maier, S. Pietri, Zs. Podolyák, K. Steiger, H. Weick, H.J. Wollersheim, P.J. Woods, N. Al-Dahan, N. Alkhomashi, A. Ataç, A. Blazhev, N. Braun, I. Čeliković, T. Davinson, I. Dillmann, C. Domingo-Pardo, P. Doornenbal, G. Farrelly, F. Farinon, G. de France, J. Gerl, N. Goel, T. Habermann, R. Hoischen, R. Janik, M. Karny, A. Kaşkaş, I. Kojouharov, Th. Kröll, M. Lewitowicz, Yu.A. Litvinov, S. Myalski, F. Nebel, S. Nishimura, C. Nociforo, J. Nyberg, A. Parikh, A. Procházka, P.H. Regan, C. Rigollet, H. Schaffner, C. Scheidenberger, S. Schwertel, P.-A. Söderström, S. Steer, A. Stolz, and P. Strmeň

Subjects
Electromagnetic transitions, Shell model, Effective charges near 100Sn, Physics, QC1-999
Abstract

In a high-energy fragmentation experiment at GSI an I=π(6+) isomer and its γ-decay are identified in 102Sn, the two-neutron neighbour of the doubly-magic 100Sn. Its half-life is measured to be T=1/2367(11) ns. The possible existence of further isomers is discussed in the framework of large-scale shell model (LSSM) calculations including up to five particle-hole excitations of the 100Sn core. From the precise B(E2; 6+→4+) strength and the recently remeasured value for B(E2; 8+→6+) in the two-proton hole neighbour 98Cd effective E2 polarization charges for protons and neutrons were inferred including LSSM corrections within the full N=4 0ħω space. The results are discussed in comparison to predicted and empirically determined effective operators.

Published
2021
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2. Neutron-rich nuclei produced at zero degrees in damped collisions induced by a beam of 18O on a 238U target

Author

I. Stefan, B. Fornal, S. Leoni, F. Azaiez, C. Portail, J.C. Thomas, A.V. Karpov, D. Ackermann, P. Bednarczyk, Y. Blumenfeld, S. Calinescu, A. Chbihi, M. Ciemala, N. Cieplicka-Oryńczak, F.C.L. Crespi, S. Franchoo, F. Hammache, Ł.W. Iskra, B. Jacquot, R.V.F. Janssens, O. Kamalou, T. Lauritsen, M. Lewitowicz, L. Olivier, S.M. Lukyanov, M. Maccormick, A. Maj, P. Marini, I. Matea, M.A. Naumenko, F. de Oliveira Santos, C. Petrone, Yu.E. Penionzhkevich, F. Rotaru, H. Savajols, O. Sorlin, M. Stanoiu, B. Szpak, O.B. Tarasov, and D. Verney

Subjects
Physics, QC1-999
Abstract

Cross sections and corresponding momentum distributions have been measured for the first time at zero degrees for the exotic nuclei obtained from a beam of 18O at 8.5 MeV/A impinging on a 1 mg/cm2 238U target. Sizable cross sections were found for the production of exotic species arising from the neutron transfer and proton removal from the projectile. Comparisons of experimental results with calculations based on deep-inelastic reaction models, taking into account the particle evaporation process, indicate that zero degree is a scattering angle at which the differential reaction cross section for production of exotic nuclei is at its maximum. This result is important in view of the new generation of zero degrees spectrometers under construction, such as the S3 separator at GANIL, for example. Keywords: Nuclear reactions, Deep-inelastic collisions, Exotic nuclei

Published
2018
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3. The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd

Author

P.J. Davies, H. Grawe, K. Moschner, A. Blazhev, R. Wadsworth, P. Boutachkov, F. Ameil, A. Yagi, H. Baba, T. Bäck, M. Dewald, P. Doornenbal, T. Faestermann, A. Gengelbach, J. Gerl, R. Gernhäeuser, S. Go, M. Górska, E. Gregor, T. Isobe, D.G. Jenkins, H. Hotaka, J. Jolie, I. Kojouharov, N. Kurz, M. Lewitowicz, G. Lorusso, L. Maier, E. Merchan, F. Naqvi, H. Nishibata, D. Nishimura, S. Nishimura, F. Nowacki, N. Pietralla, H. Schaffner, P.-A. Söderström, H.S. Jung, K. Steiger, T. Sumikama, J. Taprogge, P. Thöle, N. Warr, H. Watanabe, V. Werner, Z.Y. Xu, K. Yoshinaga, and Y. Zhu

Subjects
β-decay, βp-decay, γ-ray spectroscopy, Half-life, Shell-model, WKB, Physics, QC1-999
Abstract

The first evidence for β-delayed proton emission from the 16+ spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16+ isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in 96Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ∼5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16+ state.

Published
2017
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4. Spectroscopy of neutron-rich nitrogen isotopes with Agata+Paris+Vamos

Author

S. Ziliani, M. Ciemała, F.C.L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M.N. Harakeh, Ł.W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S.M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D.R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Ziębliński, M. Zielińska, Ziliani, S., Ciemała, M., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, Ł. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Müller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., 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), 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), Institut Laue-Langevin (ILL), 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 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), ILL, and Research unit Nuclear & Hadron Physics

Subjects
Physics, education.field_of_study, Spectrometer, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Population, Gamma ray, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, AGATA, 010306 general physics, Spectroscopy, education, Beam (structure)
Abstract

Excited states of 17N, 18N and 19N were investigated through the measurement of gamma rays, following their population via deep-inelastic reactions induced by an 18O beam (7 MeV/u) on a thick 181Ta target. The experimental setup comprised the AGATA+PARIS detection system, coupled to the VAMOS++ magnetic spectrometer. In the 17N nucleus, the analysis of gamma-ray transitions de-exciting two states around 4-5 MeV clearly pointed to discrepancies with the lifetime values reported in literature. Three new gamma rays were observed in 18N at the energies of 1662.3 (3) keV, 2073.4 (8) keV and 2300.9 (8) keV, and hints for other two new transitions around 1566 keV and 1720 keV were found. In addition, a new transition with energy of 2489.7 (8) keV was observed in 19N.

Published
2020

5. γ decay to the ground state from the excitations above the neutron threshold in the Pb208(p,p′γ) reaction at 85 MeV

Author

B. Wasilewska, M. Kmiecik, M. Ciemała, A. Maj, F. C. L. Crespi, A. Bracco, M. N. Harakeh, P. Bednarczyk, S. Bottoni, S. Brambilla, F. Camera, I. Ciepał, N. Cieplicka-Oryńczak, M. Csatlos, B. Fornal, V. Gaudilla, J. Grȩbosz, J. Isaak, Ł. W. Iskra, M. Jeżabek, A. J. Krasznahorkay, S. Kihel, M. Krzysiek, P. Lasko, S. Leoni, M. Lewitowicz, J. Łukasik, M. Matejska-Minda, K. Mazurek, P. J. Napiorkowski, W. Parol, P. Pawłowski, L. Q. Qi, M. Saxena, Ch. Schmitt, Y. Sobolev, B. Sowicki, M. Stanoiu, A. Tamii, O. Wieland, and M. Ziȩbliński

Published
2022

6. Complete set of bound negative-parity states in the neutron-rich nucleus 18N

Author

S. Ziliani, M. Ciemała, F. C. L. Crespi, S. Leoni, B. Fornal, T. Suzuki, T. Otsuka, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M. N. Harakeh, Ł. W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Ziębliński, M. Zielińska, 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 Laue-Langevin (ILL), ILL, 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Set (abstract data type), Physics, Particle physics, medicine.anatomical_structure, 010308 nuclear & particles physics, 0103 physical sciences, medicine, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Parity (mathematics), 01 natural sciences, Nucleus
Abstract

International audience; High-resolution γ-ray spectroscopy of N18 is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an O18 beam on a Ta181 target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in N18 below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 01− and 12− excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in N16 and N18, for the first time. Understanding the N18 structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

Published
2021

7. Accessing tens-to-hundreds femtoseconds nuclear state lifetimes with low-energy binary heavy-ion reactions

Author

M. Zieblinski, J. Grebosz, K. Mazurek, Simone Coelli, S. Brambilla, H. J. Li, B. Million, M. Rejmund, Bertrand Jacquot, P. Bednarczyk, N. Cieplicka-Oryńczak, M. Ciemala, M. Bast, S. Ziliani, O. Dorvaux, S. Erturk, Eric Clément, Ł. W. Iskra, C. Fransen, S. M. Lenzi, B. Fornal, P. J. Napiorkowski, C. Müller-Gatermann, M. Zielińska, B. Wasilewska, I. Matea, A. Maj, M. Kmiecik, Y. H. Kim, M. Kicińska-Habior, C. Michelagnoli, I. Stefan, M. Beckers, F. C. L. Crespi, O. Wieland, M. Lewitowicz, R. Palit, D. R. Napoli, Ch. Schmitt, A. V. Karpov, M. Stanoiu, F. Camera, Emanuele Vardaci, M. Matejska-Minda, A. Bracco, G. Benzoni, S. Bottoni, S. Leoni, V. Nanal, C. Boiano, A. Lemasson, Mohsen Harakeh, Thomas Braunroth, A. Goldkuhle, 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), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ciemala, M., Ziliani, S., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y. -H., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, C., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., H. Niewodniczanski Institute of Nuclear Physics, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Dipartimento di Fisica (Milano), Università degli Studi di Milano [Milano] (UNIMI), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Institut für Kernphysik der Universität zu Köln, Universität zu Köln, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Milano = University of Milan (UNIMI), Universität zu Köln = University of Cologne, 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)-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 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), and Nuclear Energy

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Monte Carlo method, Hadron, FOS: Physical sciences, Binary number, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Excited state, 0103 physical sciences, Nuclear fusion, AGATA, Nuclear Experiment (nucl-ex), Connection (algebraic framework), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

A novel Monte Carlo technique has been developed to determine lifetimes of excited states in the tens-to-hundreds femtoseconds range in products of low-energy heavy-ion binary reactions, with complex velocity distributions. The method is based on a detailed study of Doppler-broadened $$\gamma $$ γ -ray lineshapes. Its relevance is demonstrated in connection with the $$^{18}\text {O}(7.0\, \text {MeV/u})+\,^{181}\text {Ta}$$ 18 O ( 7.0 MeV/u ) + 181 Ta experiment, performed at GANIL with the AGATA+VAMOS+PARIS setup, to study neutron-rich O, C, N, ... nuclei. Excited states in $$^{17}\text {O}$$ 17 O and $$^{19}\text {O}$$ 19 O , with known lifetimes, are used to validate the method over the $$\sim 20{-}400\,\text {fs}$$ ∼ 20 - 400 fs lifetime-sensitivity range. Emphasis is given to the unprecedented position resolution provided by $$\gamma $$ γ -tracking arrays, which turns out to be essential for reaching the required accuracy in Doppler-shift correction. The technique is anticipated to be an important tool for lifetime investigations in exotic neutron-rich nuclei, produced with intense ISOL-type beams.

Published
2021

8. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Published
2021

9. The IFMIF-DONES fusion oriented neutron source: evolution of the design

Author

W. Królas, A. Ibarra, F. Arbeiter, F. Arranz, D. Bernardi, M. Cappelli, J. Castellanos, T. Dézsi, H. Dzitko, P. Favuzza, A. García, J. Gutiérrez, M. Lewitowicz, A. Maj, F. Martin-Fuertes, G. Micciché, A. Muñoz, F.S. Nitti, T. Pinna, I. Podadera, J. Pons, Y. Qiu, R. Román, M. Toth, A. Zsakai, 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), and 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)

Subjects
liquid metal technology, Technology, 050210 logistics & transportation, Nuclear and High Energy Physics, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], IFMIF-DONES, 05 social sciences, experiments with neutrons, Condensed Matter Physics, accelerator technology, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, fusion-like neutron source, materials irradiation, 0502 economics and business, 0103 physical sciences, ddc:600
Abstract

International audience; Abstract IFMIF-DONES is a powerful neutron irradiation facility for the study and qualification of materials planned as part of the European roadmap to fusion-generated electricity. Its main goal is to study properties of materials under severe irradiation in a neutron field similar to the one in a fusion reactor first wall. It is a key facility to prepare for the construction of the DEMO power plant envisaged to follow ITER. The decision to start the construction of IFMIF-DONES is expected imminent. In this paper we present and discuss several key technical studies and decisions to improve and optimize the engineering design of IFMIF-DONES which were carried out as part of the activities in the framework of the EUROfusion Early Neutron Source work package (2015–2020). The following topics are discussed in this paper: the new layout of the IFMIF-DONES SRF LINAC accelerator and high-energy beam transport line, 7Be impurity management approach for the lithium loop, a maintainable test cell concept, a revised layout of the access cell for the remote maintenance operations, and facilities for complementary experiments.

Published
2021

10. Spectroscopy of Cd99 and In101 from β decays of In99 and Sn101

Author

F. Browne, Zhengyu Xu, I. Kojouharov, Y. F. Fang, A. Blazhev, Jinguang Wu, D. S. Ahn, Roman Gernhäuser, P. A. Söderström, D. Kameda, B. Blank, Igor T. Čeliković, T. Isobe, Shunji Nishimura, R. Krücken, H. Schaffner, M. Górska, P. Doornenbal, Z. Wang, I. Nishizuka, Toshiyuki Kubo, Stephen Rice, D. Lubos, K. Steiger, S. Ilieva, M. M. Rajabali, Naohito Inabe, Joochun Park, Young-Ki Kim, Younghun Kwon, A. Jungclaus, Hiroshi Suzuki, Hirofumi Watanabe, Y. Shimizu, T. Faestermann, H. Grawe, N. Kurz, P. Boutachkov, Naoki Fukuda, L. Sinclair, Giuseppe Lorusso, H. Baba, N. Goel, Hiroyoshi Sakurai, Toshiyuki Sumikama, K. Moschner, J. Giovinazzo, Hiroyuki Takeda, G. D. Kim, Daichi Murai, M. Lewitowicz, and Zena Patel

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Excited state, 0103 physical sciences, SHELL model, Atomic physics, 010306 general physics, Spectroscopy, Branching (polymer chemistry), 01 natural sciences, Coincidence, Spectral line
Abstract

We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions.

Published
2020

11. Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in C16 and O20

Author

M. Ciemała, S. Ziliani, F. C. L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M. N. Harakeh, Ł. W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Zieblinski, M. Zielińska, A. Ataç, D. Barrientos, B. Birkenbach, A. J. Boston, B. Cederwall, L. Charles, J. Collado, D. M. Cullen, P. Désesquelles, C. Domingo-Pardo, J. Dudouet, J. Eberth, V. González, J. Goupil, L. J. Harkness-Brennan, H. Hess, D. S. Judson, A. Jungclaus, W. Korten, M. Labiche, A. Lefevre, R. Menegazzo, D. Mengoni, J. Nyberg, R. M. Perez-Vidal, Zs. Podolyak, A. Pullia, F. Recchia, P. Reiter, F. Saillant, M. D. Salsac, E. Sanchis, O. Stezowski, Ch. Theisen, J. J. Valiente-Dobón, J. D. Holt, J. Menéndez, A. Schwenk, and J. Simonis

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear structure, Ab initio, Neutron, State (functional analysis), Atomic physics, 010306 general physics, 7. Clean energy, 01 natural sciences, Nuclear theory
Abstract

To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2(+) state in neutron-rich O-20, tau(2(2)(+)) = 150(-30)(+80) fs, and an estimate for the lifetime of ...

Published
2020

12. Double differential neutron spectra generated by the interaction of a 12 MeV/nucleon 36S beam on a thick natCu target

Author

M. Parlog, X. Ledoux, B. Laurent, J. C. Thomas, F. Porée, Franck Delaunay, E. Dessay, N. Ménard, L Achouri, G. F. Grinyer, V. Desmezières, N.D. Trinh, M. Dupuis, J Grinyer, T. Clerc, M. Lewitowicz, A. Madeline, and M. Fadil

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Iterative method, Nuclear Theory, Monte Carlo method, 01 natural sciences, 7. Clean energy, Nuclear physics, Time of flight, 13. Climate action, Nat, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation, Beam (structure)
Abstract

Double differential neutron spectra (energy, angle) originating from a thick nat Cu target bombarded by a 12 MeV/nucleon 36 S 16 + beam were measured by the activation method and the Time-of-flight technique at the Grand Accelerateur National d’Ions Lourds (GANIL). A neutron spectrum unfolding algorithm combining the SAND-II iterative method and Monte-Carlo techniques was developed for the analysis of the activation results that cover a wide range of neutron energies. It was implemented into a graphical user interface program, called GanUnfold. The experimental neutron spectra are compared to Monte-Carlo simulations performed using the PHITS and FLUKA codes.

Published
2018

13. APPEC, ECFA, and NuPECC Tighten Their Collaboration

Author

Andreas Haungs, M. Lewitowicz, and Karl Jakobs

Subjects
Astroparticle physics, Nuclear and High Energy Physics, Engineering, business.industry, Engineering ethics, business
Abstract

The European Committee for Future Accelerators (ECFA), Nuclear Physics European Collaboration Committee (NuPECC), and AstroParticle Physics European Consortium (APPEC) are playing a major role in t...

Published
2021

14. The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

Shunji Nishimura, Yu. A. Litvinov, T. Davinson, H. J. Wollersheim, F. Nebel, K. Straub, T. Habermann, S. Schwertel, T. Faestermann, Igor T. Čeliković, P. Boutachkov, F. Farinon, C. Hinke, P. Strmeň, Hans Geissel, H. Schaffner, M. Karny, F. Nowacki, M. Lewitowicz, H. Grawe, N. Kurz, M. Górska, P. A. Söderström, G. F. Farrelly, Andreas Stolz, Zs. Podolyák, A. Atac, J. Grȩbosz, A. Prochazka, Robert Hoischen, I. Kojouharov, R. Janik, C. Scheidenberger, P. J. Woods, P. H. Regan, S. J. Steer, S. Pietri, S. Myalski, N. Braun, Roman Gernhäuser, M. Böhmer, A. Blazhev, N. Al-Dahan, Johan Nyberg, R. Krücken, A. Kaşkaş, J. Gerl, N. Alkhomashi, L. Maier, N. Goel, C. Nociforo, A. Gottardo, Zhi Liu, Catherine Rigollet, C. Domingo-Pardo, Helmut Weick, P. Doornenbal, Iris Dillmann, A. Parikh, K. Steiger, Th. Kröll, CoSee GmbH [Darmstadt], Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), 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), SUPA School of Physics and Astronomy [Edinburgh], University of Edinburgh, Polish Academy of Sciences (PAN), Department of Physics, University of Surrey, University of Surrey (UNIS), Department of Physics, Faculty of Science, Middle East Technical University, Ankara, Turkey, Department of Fusion Plasma Physics [Stockholm] (KTH), Royal Institute of Technology [Stockholm] (KTH ), University of Cologne, Vinča Institute of Nuclear Sciences, University of Belgrade [Belgrade], 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), Comenius University in Bratislava, University of Warsaw (UW), Faculty of Science Astronomy, Ankara University, Tandogan Ankara, TR-06100 Turkey, obasturk@ankara.edu.tr, Polska Akademia Nauk = Polish Academy of Sciences (PAN), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Uppsala Universitet [Uppsala], Kernfysisch Versneller Instituut (KVI), University of Groningen [Groningen], Uppsala University, Michigan State University [East Lansing], Michigan State University System, RISING, 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Blank, B., and Technische Universität München [München] (TUM)

Subjects
Sn, Nuclear and High Energy Physics, Proton, QC1-999, SHELL model, Closure (topology), Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Space (mathematics), 01 natural sciences, Subatomär fysik, Shell model, Fragmentation (mass spectrometry), Subatomic Physics, 0103 physical sciences, ddc:530, Neutron, 010306 general physics, Effective charges near Sn, Physics, 010308 nuclear & particles physics, Effective charges near, Polarization (waves), ddc, Effective charges near Sn-100, Electromagnetic transitions, Effective charges near 100Sn, Atomic physics
Abstract

Physics letters / B 820, 136591 (2021). doi:10.1016/j.physletb.2021.136591, Published by North-Holland Publ., Amsterdam

Published
2021

15. Measurement of the $\gamma$ Decay from the Energy Region of the Pygmy Dipole States Excited in the $^{208}$Pb$(p,p'\gamma )$ Reaction at CCB

Author

M. Matejska-Minda, Piotr Pawłowski, P. J. Napiorkowski, A. Bracco, M. Zieblinski, J. Grebosz, Y. Sobolev, B. Wasilewska, M. Kmiecik, S. Brambilla, P. Bednarczyk, F. C. L. Crespi, N. Cieplicka-Oryńczak, M. Krzysiek, M. Ciemala, J. Łukasik, K. Mazurek, A. Maj, K. Guguła, Izabela Ciepał, M. Lewitowicz, Ch. Schmitt, M.N. Harakeh, B. Sowicki, B. Fornal, M. Jeżabek, M. Kicińska-Habior, P. Kulessa, 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), Research unit Nuclear & Hadron Physics, 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 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)

Subjects
Physics, 010308 nuclear & particles physics, Cyclotron, Nuclear structure, Gamma ray, General Physics and Astronomy, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spectral line, law.invention, Nuclear physics, Dipole, law, Excited state, 0103 physical sciences, Nuclear Experiment
Abstract

International audience; For a few years, the medical cyclotron Proteus C-235 at the Cyclotron Centre Bronowice in Kraków, Poland has been regularly used for nuclear structure experiments. One of the ongoing studies is focused on the γ decay of collective states populated in (p, p0γ) reactions. In a recent experiment, γ decays of excited states in the energy region of the Pygmy Dipole States in 208Pb have been observed. Good efficiency and energy resolution provided by the PARIS clusters and LaBr3:Ce scintillators facilitate a comparison of the obtained energy spectra with previous measurements of pygmy states in this nucleus.

Published
2019

16. Properties of γ -decaying isomers in the Sn100 region populated in fragmentation of a Xe124 beam

Author

V. Werner, Torbjörn Bäck, Toshiyuki Sumikama, H. Grawe, K. Moschner, N. Warr, N. Kurz, T. Isobe, Giuseppe Lorusso, M. Górska, M. Dewald, P. J. Davies, F. Ameil, P. Doornenbal, A. Gengelbach, J. Gerl, Hyo Soon Jung, Shin-Ichiro Nishimura, H. Baba, F. Naqvi, E. Gregor, K. Steiger, P. A. Söderström, M. Lewitowicz, Daiki Nishimura, T. Faestermann, D. G. Jenkins, Jan Taprogge, Zhengyu Xu, H. Hotaka, P. Thöle, P. Boutachkov, Ayumi Yagi, H. Watanbe, R. Wadsworth, H. Schaffner, A. Blazhev, G. Häfner, R. Lozeva, Norbert Pietralla, J. Jolie, K. Yoshinaga, I. Kojouharov, E. Merchan, Hiroki Nishibata, Roman Gernhäuser, Shintaro Go, and Y. Zhu

Subjects
Physics, Microsecond, Ion beam, Fragmentation (mass spectrometry), 010308 nuclear & particles physics, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

A systematic study was performed of microsecond γ-decaying isomers around Sn100 produced in a fragmentation reaction of a Xe124 beam at 345 MeV/u at the Radioactive Ion Beam Factory of the RIKEN Nishina Center in Saitama, Japan. Half-lives of isomeric states in that region were remeasured allowing us to improve the currently available experimental information. Reduced transition probabilities were deduced and compared to shell-model calculations in various model spaces. The recently reported low-energy transitions in Rh92 and Ag96 were remeasured with improved precision. Additionally, experimental information on isomeric ratios, including five new ones, were extracted and compared to a previous experimental study and the sharp cutoff model of fragmentation reaction.

Published
2019

17. 30 Years of NuPECC

Author

M. Lewitowicz, 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), and 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)

Subjects
Nuclear and High Energy Physics, History, Work (electrical), Library science, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

After several years of preparatory work, the first NuPECC meeting was held on 1–2 October 1988 in Darmstadt.In Bucharest on 12–13 October 2018, NuPECC celebrated its 30th anniversary in the presenc...

Published
2019

18. Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Author

H. Baba, N. Goel, I. Kojouharov, T. Faestermann, N. Kurz, M. Górska, Young-Ki Kim, Stephen Rice, S. Ilieva, Younghun Kwon, Naoki Fukuda, P. Boutachkov, Shunji Nishimura, Z. Wang, Mustafa Rajabali, B. Blank, A. Blazhev, T. Isobe, K. Moschner, Zhi-Fang Xu, I. Nishizuka, K. Steiger, D. S. Ahn, Igor T. Čeliković, Daichi Murai, Toshiyuki Sumikama, M. Lewitowicz, Joochun Park, J. Giovinazzo, N. Warr, Hiroyuki Takeda, Y. F. Fang, A. Jungclaus, Roman Gernhäuser, Hirofumi Watanabe, Y. Shimizu, Hiroshi Suzuki, D. Kameda, Zena Patel, L. Sinclair, P. Doornenbal, Jinguang Wu, Giuseppe Lorusso, Toshiyuki Kubo, P. A. Söderström, Naohito Inabe, R. Krücken, F. Browne, Hiroyoshi Sakurai, H. Schaffner, and D. Lubos

Subjects
Physics, End point, Proton, 0103 physical sciences, Center (category theory), General Physics and Astronomy, Value (computer science), Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences, Beta decay, Energy (signal processing)
Abstract

A record number of ^{100}Sn nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of ^{100}Sn were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0^{+}→1^{+} Gamow-Teller decay was improved to B_{GT}=4.4_{-0.7}^{+0.9}. A discrimination between different model calculations was possible for the first time, and the level scheme of ^{100}In is investigated further.

Published
2019

19. New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

Author

Toshiyuki Sumikama, J. Giovinazzo, Hiroyuki Takeda, Hiroyoshi Sakurai, D. Kameda, Hidetada Baba, T. Faestermann, Stephen Rice, Y. Shimizu, Shunji Nishimura, T. Isobe, I. Kojouharov, S. Ilieva, P. Doornenbal, L. Sinclair, Young-Ki Kim, F. Browne, Y. F. Fang, Giuseppe Lorusso, Younghun Kwon, Hiroshi Watanabe, Igor T. Čeliković, Z. Wang, N. Goel, P. Boutachkov, Jinguang Wu, Joochun Park, K. Steiger, Bertram Blank, D. Lubos, Z. Patel, Naohito Inabe, A. Jungclaus, I. Nishizuka, Zhengyu Xu, Toshiyuki Kubo, Roman Gernhäuser, Mustafa Rajabali, Hiroshi Suzuki, A. Blazhev, P. A. Söderström, D. S. Ahn, G. D. Kim, Daichi Murai, M. Lewitowicz, R. Krücken, H. Schaffner, K. Moschner, H. Grawe, N. Kurz, M. Górska, and Naoki Fukuda

Subjects
Physics, Spins, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Proton emission, Nuclear Experiment, 010306 general physics, Spectroscopy, Excitation
Abstract

A decay spectroscopy experiment on proton-rich nuclei in the vicinity of the doubly magic Sn100 was carried out at RIKEN Nishina Center. More than 20 nuclei with 43≤Z≤50 and N≤51, produced by fragmentation reactions were investigated via analyses of β-decay, βp-decay, and subsequent γ-ray data. Owing to higher statistics, the precision on the half-lives of many of the ground states and isomers was improved. β-decay endpoint energies of 11 states in 8 nuclei were measured for the first time, and the corresponding QEC and excitation energies were generally consistent with various mass models. Many β-delayed proton emission branching ratios were measured either for the first time or with higher precision compared to literature values, and some of them differed by more than 2σ. Many of the large discrepancies were associated with nuclei with long-lived isomeric states, highlighting large systematic uncertainties involved in these measurements. Twenty-five new γ rays were observed, and ten new states are proposed with unambiguous excitation energies, spins, and parities. Most of the energies of the excited states were consistent within 300 keV or 20%, whichever was greater, compared to shell model predictions in the proton/neutron (p1/2,g9/2) model space assuming a Sr76 core. A signature of a new (1/2-) isomer in Cd97 with T1/2=0.73(7) s was found, in good agreement with shell model predictions.

Published
2019

20. In Memoriam: Claude Détraz (1938—2020): A Committed and Visionary Physicist of the European Science

Author

M. Lewitowicz, Alex C. Mueller, Dominique Guillem-Mueller, Sydney Gales, and Navin Alahari

Subjects
Nuclear and High Energy Physics, Research career, media_common.quotation_subject, Art history, Alumnus, Art, media_common
Abstract

Claude DetrazClaude Detraz was born 20 March 1938 in Albi (Tarn), France. An alumnus of the Ecole Normale Superieure, he started his research career at the Centre National de la Recherche Scientifi...

Published
2020

21. Testing of the Brink--Axel Hypothesis with the HECTOR+PARIS+KRATTA Set-up

Author

N. Cieplicka-Oryńczak, M. Krzysiek, S. Brambilla, M. Ciemala, P. Bednarczyk, A. Maj, A. Bracco, P. J. Napiorkowski, J. Łukasik, J. Isaak, Izabela Ciepał, B. Fornal, P. Lasko, L. Qi, M. Stanoiu, Y. Sobolev, M. Lewitowicz, S. Bottoni, M. Matejska-Minda, Ch. Schmitt, Piotr Pawłowski, B. Wasilewska, Mohsen Harakeh, K. Guguła, Wiktor Parol, Ł. W. Iskra, F. C. L. Crespi, M. Zieblinski, S. Kihel, J. Grebosz, Atsushi Tamii, M. Kmiecik, A. Szperłak, B. Sowicki, K. Mazurek, Attila Krasznahorkay, 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), 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 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), Université de Strasbourg (UNISTRA)-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 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), and 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)

Subjects
Physics, Set (abstract data type), [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, Art history, Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

International audience; A very first experiment in the field of nuclear structure at the Cyclotron Centre Bronowice (CCB) facility in Kraków, Poland has been performed recently. The medical cyclotron IBA Proteus C-235 located at CCB produces proton beams in the energy range of 70–230 MeV, that can be used for experimental purposes as well. In the reported measurement, the energy of scattered protons at the incident beam energy of 85 MeV and emitted γ rays from the excited 208Pb target were measured in coincidence. During the experiment excitations in the energy region of the Giant Quadrupole and Dipole Resonances, as well as the Pygmy Dipole States were observed. By applying different conditions on the data, spectra corresponding to γ decays of excited states to selected low-lying levels in 208Pb were obtained, allowing a look into the Brink–Axel hypothesis.

Published
2018

22. Properties of $\gamma $-decaying Isomers in the $^{100}$Sn Region Revisited

Author

Giuseppe Lorusso, M. Dewald, Hiroki Nishibata, H. Baba, E. Gregor, Shin-Ichiro Nishimura, A. Gengelbach, P. Thöle, H. Schaffner, V. Werner, T. Isobe, A. Blazhev, J. Gerl, F. Naqvi, P. J. Davies, Shintaro Go, Y. Zhu, Ayumi Yagi, K. Moschner, Toshiyuki Sumikama, Torbjörn Bäck, J. Jolie, T. Faestermann, D. G. Jenkins, P. Doornenbal, E. Merchan, M. Górska, M. Lewitowicz, N. Warr, Roman Gernhäuser, K. Steiger, Jan Taprogge, Zhengyu Xu, F. Ameil, H. Hotaka, K. Yoshinaga, I. Kojouharov, H. Grawe, N. Kurz, P. A. Söderström, Norbert Pietralla, Hirofumi Watanabe, R. Wadsworth, Daiki Nishimura, G. Haefner, P. Boutachkov, Hyo Soon Jung, 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), 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), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Federal Ministry of Education and Research (Germany), Department of Energy (US), Bonn-Cologne Graduate School of Physics and Astronomy, and SCOAP

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, Astrophysics::Instrumentation and Methods for Astrophysics, Nuclear structure, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear Experiment, 010306 general physics, 010303 astronomy & astrophysics, Nucleus
Abstract

7 pags., 4 figs. -- Presented at the Zakopane Conference on Nuclear Physics “Extremes of the Nuclear Landscape”, Zakopane, Poland, August 26–September 2, 2018. -- Open Access funded by Creative Commons Atribution Licence 4.0, The study of nuclei in the region around the N = Z doubly-magic nucleus 100Sn has been of long standing interest for the nuclear structure and nuclear astrophysics. Recently, Park et al. have reported on properties of γ-decaying isomers and isomeric ratios in the vicinity of 100Sn. That experiment was performed at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center in Japan as a part of the EURICA campaign. Neutron-deficient nuclei were produced in a fragmentation reaction of a 124Xe primary beam on a 9Be target at an energy of 345 MeV/A. Secondary ions were separated and identified in the BigRIPS fragment separator and implanted in the silicon detector array WAS3ABi. The data presented here were obtained in another experiment performed at the RIBF using the same reaction but slightly different separator settings. New results of ratios of isomeric population and half-lives of γ-decaying isomers populated in the experiment are presented., This work was carried out at the RIBF operated by the RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. The authors acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of cluster detectors. This work was partly supported by the German BMBF under contract No. 05P12PKFNE and No. 05P15PKFNA and by the U.S. DOE under grant No. DE-FG02-91ER-40609. G.H. is supported by the Bonn–Cologne Graduate School of Physics and Astronomy.

Published
2018

23. β decays of the heaviest N=Z−1 nuclei and proton instability of In97

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, Nuclear physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Beta (finance), 01 natural sciences, Instability
Published
2018

24. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2018

25. NuPECC in the Nuclear Physics Landscape

Author

Eberhard Widmann, M. Lewitowicz, 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
Nuclear physics, Nuclear and High Energy Physics, Engineering, business.industry, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Plan (drawing), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], business, ComputingMilieux_MISCELLANEOUS, Range (computer programming)
Abstract

The recent completion and publication of the 2017 NuPECC Long Range Plan (LRP) has defined a clear strategy for development of nuclear physics in Europe. We wish to acknowledge here the wonderful w...

Published
2018

26. Neutron-rich nuclei produced at zero degrees in damped collisions induced by a beam of 18O on a 238U target

Author

A. Maj, C. Portail, F. Rotaru, B. Fornal, M. A. Naumenko, L. Olivier, F. de Oliveira Santos, S. Franchoo, A. Chbihi, P. Bednarczyk, A. V. Karpov, C. Petrone, Bertrand Jacquot, Oleg B. Tarasov, Ł. W. Iskra, Yu. E. Penionzhkevich, F. Azaiez, T. Lauritsen, D. Verney, M. Stanoiu, B. Szpak, F. C. L. Crespi, M. Maccormick, O. Sorlin, O. Kamalou, H. Savajols, I. Stefan, R. V. F. Janssens, I. Matea, N. Cieplicka-Oryńczak, M. Ciemala, Dieter Ackermann, Y. Blumenfeld, S. Leoni, Paola Marini, S. Calinescu, F. Hammache, M. Lewitowicz, S. M. Lukyanov, J. C. Thomas, 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), 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), 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 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), 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 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
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, Projectile, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, lcsh:QC1-999, Momentum, Nuclear physics, Cross section (physics), Deep-inelastic collisions, 0103 physical sciences, Neutron, Nuclear reactions, 010306 general physics, Nuclear Experiment, Beam (structure), lcsh:Physics, Exotic nuclei
Abstract

Cross sections and corresponding momentum distributions have been measured for the first time at zero degrees for the exotic nuclei obtained from a beam of 18O at 8.5 MeV/A impinging on a 1 mg/cm2 238U target. Sizable cross sections were found for the production of exotic species arising from the neutron transfer and proton removal from the projectile. Comparisons of experimental results with calculations based on deep-inelastic reaction models, taking into account the particle evaporation process, indicate that zero degree is a scattering angle at which the differential reaction cross section for production of exotic nuclei is at its maximum. This result is important in view of the new generation of zero degrees spectrometers under construction, such as the S3 separator at GANIL, for example. Keywords: Nuclear reactions, Deep-inelastic collisions, Exotic nuclei

Published
2018
Full Text
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27. High precision measurement of the Ne19β -decay half-life using real-time digital acquisition

Author

C. Fontbonne, P. Ujić, F. de Oliveira Santos, X. Fléchard, F. Rotaru, N. L. Achouri, V. Girard Alcindor, B. Bastin, F. Boulay, J. B. Briand, A. M. Sánchez-Benítez, H. Bouzomita, C. Borcea, R. Borcea, B. Blank, B. Carniol, I. Čeliković, P. Delahaye, F. Delaunay, D. Etasse, G. Fremont, G. de France, J. M. Fontbonne, G. F. Grinyer, J. Harang, J. Hommet, A. Jevremović, M. Lewitowicz, I. Martel, J. Mrazek, M. Parlog, J. Poincheval, D. Ramos, C. Spitaels, M. Stanoiu, J. C. Thomas, and D. Toprek

Subjects
Event selection, Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, Half-life, Offline analysis, 010306 general physics, 01 natural sciences, Relevant information, Beta decay
Abstract

The half-life of $^{19}\mathrm{Ne}$ was measured using a real-time digital multiparametric acquisition system, providing an accurate time stamp and relevant information on the detector signals for each decay event. An exhaustive offline analysis of the data gave unique access to experimental effects potentially biasing the measurement. After establishing the influence factors impacting the measurement such as after-pulses, pile-up, gain, and baseline fluctuations, their effects were accurately estimated and the event selection optimized. The resulting half-life, $17.2569\ifmmode\pm\else\textpm\fi{}0.{0019}_{(\text{stat})}\ifmmode\pm\else\textpm\fi{}0.{0009}_{(\text{syst})}$ s, is the most precise up to now for $^{19}\mathrm{Ne}$. It is found to be in agreement with two recent precise measurements and not consistent with the most recent one [L. J. Broussard et al., Phys. Rev. Lett. 112, 212301 (2014)] by 3.0 standard deviations. The full potential of the technique for nuclei with half-lives of a few seconds is discussed.

Published
2017

28. Publisher's Note: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, Crystallography
Abstract

J. Park et al. -- 1 pag. -- Original Article: Properties of γ-decaying isomers and isomeric ratios in the 100 Sn region. Phys. Rev. C 96, 044311 (2017)

Published
2017

29. Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

Author

Joochun Park, A. Jungclaus, Hiroshi Suzuki, G. D. Kim, Daichi Murai, Igor T. Čeliković, M. Lewitowicz, F. Browne, P. A. Söderström, L. Sinclair, Naoki Fukuda, Shunji Nishimura, Y. F. Fang, Toshiyuki Kubo, A. Blazhev, Stephen Rice, R. Krücken, Roman Gernhäuser, S. Ilieva, M. M. Rajabali, M. Górska, Hidetada Baba, Toshiyuki Sumikama, Zena Patel, Zhengyu Xu, T. Isobe, D. S. Ahn, J. Giovinazzo, Hiroyuki Takeda, Young-Ki Kim, T. Faestermann, D. Kameda, H. Grawe, N. Kurz, I. Nishizuka, P. Doornenbal, K. Steiger, Bertram Blank, D. Lubos, Naohito Inabe, Hiroyoshi Sakurai, Hirofumi Watanabe, Y. Shimizu, K. Moschner, Jin Wu, H. Schaffner, P. Boutachkov, Z. Wang, N. Goel, Giuseppe Lorusso, and I. Kojouharov

Subjects
Physics, Internal conversion, Chemical research, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Center (category theory), Atomic physics, 010306 general physics, Spectroscopy, 7. Clean energy, 01 natural sciences, Energy (signal processing)
Abstract

Half-lives and energies of $\ensuremath{\gamma}$ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic $^{100}\mathrm{Sn}$ were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from a new $({4}^{+})$ isomer with ${T}_{1/2}=0.23(6)\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$ in $^{92}\mathrm{Rh}$, a 44-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from the $({15}^{+})$ isomer in $^{96}\mathrm{Ag}$, and ${T}_{1/2}({6}^{+})=13(2)$ ns in $^{98}\mathrm{Cd}$. Shell-model calculations of electromagnetic transition strengths in the $({p}_{1/2},{g}_{9/2})$ model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed $\ensuremath{\gamma}$ rays in $^{100}\mathrm{Sn}$, new constraints on the ${T}_{1/2}$, $\ensuremath{\gamma}$-ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in $^{100}\mathrm{Sn}$.

Published
2017

30. Discovery of new isotopes Mo81,82 and Ru85,86 and a determination of the particle instability of 103Sb

Author

Naoki Fukuda, Daiki Nishimura, Daniel Bazin, H. Baba, Hiroshi Suzuki, Kohji Tanaka, M. Lewitowicz, B. M. Sherrill, Sadao Momota, Kazuo Ieki, Y. Shimizu, A. Chiba, Rin Yokoyama, Eiji Ideguchi, T. Fujii, Kenichi Yoshida, Kensuke Kusaka, Oleg B. Tarasov, Daichi Murai, Y. Yanagisawa, Meiko Kurokawa, G. Defrance, Y. Ohkoda, Naohito Inabe, Masao Ohtake, Toshiyuki Kubo, Naohito Iwasa, David J. Morrissey, Igor T. Čeliković, Hiroki Nishibata, K. Steiger, H. Takeda, Shintaro Go, D. Kameda, and Hiroshi Sato

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Projectile, Nuclear Theory, Separator (oil production), Kinetic energy, 01 natural sciences, Instability, Nuclear physics, Time of flight, Rigidity (electromagnetism), 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

A search for new proton-rich isotopes using projectile fragmentation of a 345-MeV/nucleon 124Xe beam has been performed with the BigRIPS in-flight separator at the RIKEN Nishina Center RI Beam Factory. Projectile fragments were identified by measuring the time of flight, magnetic rigidity, and energy loss in the BigRIPS separator. Projectile fragments then were transported downstream of the BigRIPS separator and re-identified by measuring the time of flight and total kinetic energy. Through such particle re-identification, we have discovered four new isotopes 81,82Mo and 85,86Ru located near the proton drip line. The 76Y and 78Zr isotopes near the proton drip line also were identified, supporting the previous report on their discovery. Furthermore, we have obtained the first clear evidence for the particle instability of 103Sb. Based on the systematics of measured production yields, the upper limit values were evaluated for the half-lives of the particle-unbound isotopes 81Nb,85Tc, and 103Sb.

Published
2017

31. Experimental approach to measure thick target neutron yields induced by heavy ions for shielding

Author

Bertrand Jacquot, M. Dupuis, N. Ménard, A. Savalle, V. Morel, J. Grinyer, S. Damoy, N.D. Trinh, F. Porée, M. Michel, G. F. Grinyer, M. Lewitowicz, V. Desmezières, B. Rannou, X. Ledoux, C. Brouillard, M. Fadil, A. Madeline, E. Dessay, T. Clerc, 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 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)

Subjects
Physics, 010308 nuclear & particles physics, business.industry, 020209 energy, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], QC1-999, Cyclotron, 02 engineering and technology, 01 natural sciences, Measure (mathematics), law.invention, Ion, Nuclear physics, law, 0103 physical sciences, Electromagnetic shielding, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, Neutron, Atomic physics, Radiation protection, business, Nuclear Experiment, FOIL method
Abstract

International audience; Double differential (angular and energy) neutron distributions were measured using an activation foil technique. Reactions were induced by impinging two low-energy heavy-ion beams accelerated with the GANIL CSS1 cyclotron: (36S (12 MeV/u) and 208Pb (6.25 MeV/u)) onto thick natCu targets. Results have been compared to Monte-Carlo calculations from two codes (PHITS and FLUKA) for the purpose of benchmarking radiation protection and shielding requirements. This comparison suggests a disagreement between calculations and experiment, particularly for high-energy neutrons.

Published
2017

32. The role of core excitations in the structure and decay of the 16(+) spin-gap isomer in Cd-96

Author

K. Moschner, H. Baba, Toshiyuki Sumikama, Y. Zhu, E. Gregor, M. Lewitowicz, Torbjörn Bäck, J. Jolie, T. Faestermann, D. G. Jenkins, Frédéric Nowacki, N. Warr, Shunji Nishimura, E. Merchan, K. Yoshinaga, Roman Gernhaeuser, H. Schaffner, A. Blazhev, N. Kurz, P. Boutachkov, F. Ameil, Hiroki Nishibata, Ayumi Yagi, I. Kojouharov, Jan Taprogge, J. Gerl, L. Maier, P. Doornenbal, Shintaro Go, D. Nishimura, H. Grawe, M. Górska, K. Steiger, H. Hotaka, T. Isobe, Ziye Xu, V. Werner, P. J. Davies, P. A. Söderström, A. Gengelbach, F. Naqvi, Hiroshi Watanabe, H. S. Jung, P. Thöle, Giuseppe Lorusso, M. Dewald, Norbert Pietralla, R. Wadsworth, 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)-Centre National de la Recherche Scientifique (CNRS), Federal Ministry of Education and Research (Germany), SCOAP, Department of Energy (US), Science and Technology Facilities Council (UK), 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), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Nuclear and High Energy Physics, Proton decay, Nuclear Theory, βp-decay, γ -ray spectroscopy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Shell-model, 01 natural sciences, 7. Clean energy, WKB approximation, Nuclear physics, Subatomär fysik, 0103 physical sciences, Subatomic Physics, ddc:530, Proton emission, 010306 general physics, Wave function, Nuclear Experiment, Physics, WKB, Spectrometer, Isotope, 010308 nuclear & particles physics, β-decay, Half-life, βp-decayγ-ray spectroscopy, beta p-decay, lcsh:QC1-999, β -decay, 3. Good health, gamma-ray spectroscopy, 13. Climate action, γ-ray spectroscopy, Physics::Accelerator Physics, Atomic physics, Ground state, βp -decay, lcsh:Physics, beta-decay
Abstract

P. J. Davies et al. -- 6 pags., 4 figs., 3 tabs.-- Open Access funded by Creative Commons Atribution Licence 4.0, The first evidence for β-delayed proton emission from the 16 spin gap isomer in Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16 isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ∼5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16 state., This work was partially supported by the German BMBF grant 05P12PKFNE, the UK Science and Technology Facilities Council(STFC) grants ST/J000124/1 and ST/L005727/1, and the U.S. DOE grant DE-FG02-91ER40609.

Published
2017

33. New Isotopes and Proton Emitters–Crossing the Drip Line in the Vicinity ofSn100

Author

I. Čeliković, M. Lewitowicz, R. Gernhäuser, R. Krücken, S. Nishimura, H. Sakurai, D.S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, Y.-K. Kim, Y. K. Kwon, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, D. Lubos, K. Moschner, D. Murai, I. Nishizuka, J. Park, Z. Patel, M. Rajabali, S. Rice, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Xu

Subjects
Physics, Range (particle radiation), Isotope, Proton, 010308 nuclear & particles physics, Center (category theory), General Physics and Astronomy, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics, Line (formation)
Abstract

Several new isotopes, ^{96}In, ^{94}Cd, ^{92}Ag, and ^{90}Pd, have been identified at the RIKEN Nishina Center. The study of proton drip-line nuclei in the vicinity of ^{100}Sn led to the discovery of new proton emitters ^{93}Ag and ^{89}Rh with half-lives in the submicrosecond range. The systematics of the half-lives of odd-Z nuclei with T_{z}=-1/2 toward ^{99}Sn shows a stabilizing effect of the Z=50 shell closure. Production cross sections for nuclei in the vicinity of ^{100}Sn measured at different energies and target thicknesses were compared to the cross sections calculated by epax taking into account contributions of secondary reactions in the primary target.

Published
2016

34. The SPIRAL 2 Project

Author

M. Lewitowicz, 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), Arnould M., Lewitowicz M., Emling H., Akimune H., Ohta M., Utsunomiya H., Wada T., Yamagata T., SPIRAL2, I. Boztosun, and A.B. Balantekin

Subjects
Radioactive ion beams, 25.60, t. 29.17.+w, 29.27.eg, 25.85.-w, Nuclear and High Energy Physics, Nuclear engineering, SHELL model, charge particle detectors, mass separators, heavy-ion induced fusion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Linear particle accelerator, Radioactive nuclear beams, Nuclear physics, neutron-induced reactions, fission, heavy-ion induced fission, Aerospace engineering, Spiral, linear accelerators, Physics, business.industry, High intensity, gamma arrays, charged particle detectors, nuclear reaction dynamics, Charged particle detectors, nuclear structure, 25.60.-t, 29.17.+w, 29.27.Eg, Physics::Accelerator Physics, Spiral (railway), business
Abstract

International audience; The project of an important new extension of the GANIL facility – SPIRAL 2 which entered in the construction phase in 2005 is shortly presented. The physics case of the facility is based on the use of high intensity stable and radioactive beams. Expected performances and main technical parameters of the facility as well as planned new experimental areas and detectors are introduced described.

Published
2008

35. The decay of proton-rich nuclei in the mass region

Author

S. Czajkowski, A. Bey, A. J. Boston, F. Becker, M. Caamaño, F. de Oliveira Santos, Robert Grzywacz, S. Grévy, P. Mayet, Margareta Hellström, C. Dossat, F. Aksouh, Marielle Chartier, V. A. Maslov, C. Moore, M. Stanoiu, Georgi P. Georgiev, D. Cortina, A Fleury, J. Giovinazzo, M. Pfützner, J. C. Thomas, C. Mazzocchi, M. J. Lopez Jimenez, B. Blank, D. Karamanis, I. Matea, C. Borcea, Michio Honma, Z. Janas, J. Kurcewicz, M. Lewitowicz, G. Canchel, N. Adimi, I. Stefan, R. Borcea, and M.S. Pravikoff

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Half-life, 01 natural sciences, 7. Clean energy, Mass formula, Nuclear physics, 0103 physical sciences, Isobaric process, Atomic physics, Proton emission, Nuclear Experiment, 010306 general physics, Multiplet
Abstract

In a series of experiments at the SISSI/LISE3 facility of GANIL conducted between 1999 and 2004, we have collected decay information for proton-rich nuclei between {sup 36}Ca and {sup 56}Zn. The data allowed us to study the decay properties of 26 nuclei. The main experimental information obtained for all nuclei is their {beta}-decay half-life and their total {beta}-delayed proton emission branching ratio. For many nuclei, individual proton groups and {gamma} rays were identified and allowed us to establish first partial decay schemes for some of the nuclei studied. In addition, mass-excess values have been determined for some of the nuclei by means of the isobaric multiplet mass equation. For {sup 50}Ni, the decay via {beta}-delayed two-proton emission could be tentatively identified. The decay of {sup 49}Ni allowed for the first time to identify the first 2{sup +} state in {sup 48}Fe. The experimental data are confronted to model predictions for the half-life and the mass-excess values.

Published
2007

36. ENSAR, a Nuclear Science Project for European Research Area

Author

M. Lewitowicz, Ketel Turzó, Muhsin N. Harakeh, Research unit Nuclear & Hadron Physics, 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), KVI-CART, University of Groningen, and University of Groningen [Groningen]

Subjects
Nuclear physics, Nuclear and High Energy Physics, Political science, Nuclear astrophysics, Library science, European Research Area, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear science
Abstract

Editorial; International audience; During the period from September 2010 to December 2014, the European project European Nuclear Science and Applications Research (ENSAR) coordinated research activities of the Nuclear Physics community performing research in three major subfields: Nuclear Structure, Nuclear Astrophysics, and Nuclear Applications.

Published
2015

37. Nuclear structure studies of $^{24}$F

Author

Jason D. Holt, Zs. Fueloep, J. C. Thomas, J. Mrazek, B. Bastin, G. F. Grinyer, F. Azaiez, M. Stanoiu, S. Grévy, C. N. Timis, D. Guillemaud-Mueller, Dóra Sohler, G. Sletten, F. Negoita, M. G. Saint-Laurent, Heiko Hergert, M. Lewitowicz, H. Savajols, L. Gaudefroy, Achim Schwenk, János Timár, Marie-Geneviève Porquet, F. Rotaru, Zs. Dombrádi, Zs. Podolyák, C. Borcea, A. Lepailleur, F. De Oliveira, R. Borcea, L. Caceres, Andras Kerek, S. M. Lukyanov, Ch. Bourgeois, B. A. Brown, A. Krasznahorkay, O. Sorlin, Zs. Vajta, Z. Elekes, P. Roussel-Chomaz, Scott Bogner, F. Ibrahim, Yu. E. Penionzhkevich, 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 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), National Institut for Nuclear Physics and Engineering (IFIN HH), National Institut for Nuclear Physics and Engineering, National Superconducting Cyclotron Laboratory (NSCL), Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), TRIUMF [Vancouver], 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), 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), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), Joint Institute for Nuclear Research (JINR), University of Surrey (UNIS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Niels Bohr Institute [Copenhagen] (NBI), Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), GANILEXP, 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 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), and University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)

Subjects
Nuclear and High Energy Physics, Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, FOS: Physical sciences, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), Fragmentation (mass spectrometry), Természettudományok, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Nuclear theory, Physics, 21.60.Cs, 23.20.Lv, 27.40.+z, 010308 nuclear & particles physics, Nuclear structure, Beta decay, medicine.anatomical_structure, Atomic physics, Nucleus
Abstract

The structure of the $^{24}$F nucleus has been studied at GANIL using the $\beta$ decay of $^{24}$O and the in-beam $\gamma$-ray spectroscopy from the fragmentation of projectile nuclei. Combining these complementary experimental techniques, the level scheme of $^{24}$F has been constructed up to 3.6 Mev by means of particle-$\gamma$ and particle-$\gamma\gamma$ coincidence relations. Experimental results are compared to shell-model calculations using the standard USDA and USDB interactions as well as ab-initio valence-space Hamiltonians calculated from the in-medium similarity renormalization group based on chiral two- and three-nucleon forces. Both methods reproduce the measured level spacings well, and this close agreement allows unidentified spins and parities to be consistently assigned., Comment: 5 figures, 2 tables

Published
2015
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38. The β-decay of 22Al

Author

B. Blank, C. Longour, Alison Laird, J. Giovinazzo, S. Czajkowski, Ari Jokinen, K. Peräjärvi, F. de Oliveira Santos, M. Lewitowicz, Peter Dendooven, Juha Äystö, N. L. Achouri, A. Emsallem, G. Canchel, J. C. Thomas, M. Stanoiu, N. Guillet, and N. Smirnova

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Branching fraction, Half-life, Alpha particle, 01 natural sciences, Beta decay, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Radioactive decay
Abstract

In an experiment performed at the LISE3 facility of GANIL, we studied the decay of 22Al produced by the fragmentation of a 36Ar primary beam. A β-decay half-life of T1/2 = 91.1±0.5ms was measured. The β-delayed one- and two-proton emission as well as β-α and β-delayed γ-decays were measured and allowed us to establish a partial decay scheme for this nucleus. New levels were determined in the daughter nucleus 22Mg. The comparison with model calculations strongly favours a spin-parity of Iπ = 4+ for the ground state of 22Al.

Published
2006

39. Physics opportunities with SPIRAL and SPIRAL 2

Author

M. Lewitowicz, 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 Elsevier

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Physics::Accelerator Physics, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Aerospace engineering, Nuclear Experiment, business, Astrophysics::Galaxy Astrophysics, Spiral
Abstract

International audience; A few examples of recent studies of nuclei far from stability obtained with radioactive beams delivered by the SPIRAL facility are presented. Future plans of GANIL related to the SPIRAL 2 project are briefly described.

Published
2004

40. Observation of bound excited states in 15B

Author

S. M. Lukyanov, J. C. Angélique, H. Savajols, M. J. Lopez-Jimenez, Y. Sobolev, M. Lewitowicz, D. Guillemaud-Mueller, M. Stanoiu, W. Mittig, C. Stodel, C. Bourgeois, Josette Duprat, F. Pougheon, Marie-Geneviève Porquet, B. A. Brown, Yu. E. Penionzhkevich, F. De Oliveira-Santos, C. Donzaud, O. Sorlin, F. Azaiez, P. Roussel-Chomaz, József Tímár, N. L. Achouri, D. Sohler, S. Grévy, Z. Dlouhy, M. Belleguic, C. Borcea, S. Leenhardt, Zs. Dombrádi, M. G. Saint-Laurent, J. M. Daugas, 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), 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 corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Time of flight, Projectile and target fragmentation, Excited state, 0103 physical sciences, Bound state, Nuclear fusion, Neutron, 25.70.Mn, 23.20.Lv, 27.20.+n, 21.60.Cs, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, gamma transitions and level energies
Abstract

The structure of the A/Z = 3 nucleus 15B has been investigated using the in-beam $\gamma$ -spectroscopy technique with a fragmentation reaction of a 36S beam on a 9Be target at 77.5 ${\rm MeV}\cdot A$ . The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph. $\gamma$ -ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the $\gamma\gamma$ -coincidence relationships a level scheme is proposed for 15B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in the psd valence space. Effects of the weakly bound nature of the valence neutrons have been observed.

Published
2004

41. Spectroscopy at the N=20 shell closure: the β-decay of32Mg

Author

G. Walter, D. Guillemaud Mueller, S. Gre´vy, Jean Péter, L. Achouri, W. N. Catford, F. Negoita, C. Borcea, A. Knipper, S. Courtin, P. Baumann, C. N. Timis, Oleg B. Tarasov, J.L. Lecouey, E. Poirier, P. Dessagne, J. M. Daugas, J.C. Ange´lique, M. Stanoiu, N. A. Orr, E. Lie´nard, R. Hadeler, A. Buta, J. Mrazek, S. Pietri, François-René Lecolley, M. Lewitowicz, F. de Oliveira, Ch. Miehé, Y. E. Penionzhkevich, Z. Dlouhy, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Island of inversion, Nuclear Theory, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron spectroscopy, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Nucleon, Isotopes of magnesium, ComputingMilieux_MISCELLANEOUS, Radioactive decay
Abstract

The shell closure N=20 has been studied by β-decay spectroscopy experiment performed at the GANIL facility. The experimental setup is described and first results on the beta-decay of 32 Mg are presented. The extracted level scheme of 32 Al is compared to Shell Model calculations and discussed in the light of the structural changes observed for the nuclei of the so-called island of inversion. Finally, neutron time-of-flight spectrum from the β-delayed neutron decay of 32 Mg is presented.

Published
2004

42. Fragmentation of 95 MeV/u 12C and 75 MeV/u 13C. Application to secondary-beam production

Author

P. Roussel-Chomaz, F. Clapier, M. Mirea, J. E. Sauvestre, T. Ethvignot, M. Lewitowicz, C. Cabot, Yang Yong Feng, R. Anne, M. G. Saint-Laurent, G. Fares, R. Bimbot, P. Delbourgo-Salvador, A. Lefebvre, S. Hachem, J. L. Sida, T. Benfoughal, 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), 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), 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), and 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)

Subjects
25.70.Mn, 29.90.+ r, Nuclear and High Energy Physics, Silicon, Gaussian, Nuclear Theory, Hadron, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Other topics in elementary-particle and nuclear physics experimental methods and instrumentation, 01 natural sciences, 7. Clean energy, law.invention, Telescope, Nuclear physics, symbols.namesake, law, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Physics, Spectrometer, 010308 nuclear & particles physics, Exponential function, chemistry, Projectile and target fragmentation, symbols, Atomic physics
Abstract

The fragmentation of 95 MeV/u 12C and 75 MeV/u 13C projectiles, interacting with natural targets of different elements (9Be, $^{\rm nat}$ Cu and 197Au for 12C, and 9Be, $^{\rm nat}$ Ni, and 181Ta for 13C) and of various thicknesses has been investigated at GANIL, using the doubly achromatic magnetic spectrometer LISE. The projectile-like fragments transmitted at 0 $^\circ$ have been analysed using a silicon $\Delta E$ -E telescope and the $\Delta E$ -time-of-flight method. The results obtained with the thinnest targets are discussed in the scope of radioactive nuclear beam production. The fragment momentum distributions can be fitted by Gaussian peaks associated with exponential tails towards low momentum values. The experimental production yields are compared with the results of the simulation code LISE. It appears that this code reproduces satisfactorily the yields of nuclei close to the stability line, but strongly overestimates the production of very neutron-deficient nuclei.

Published
2004

43. Two-proton decay of 45Fe: a new type of radioactivity

Author

M. Lewitowicz, B. Blank, C. Borcea, F. de Oliveira Santos, M.S. Pravikoff, V. A. Maslov, A. Fleury, M. Pfützner, J. Giovinazzo, S. Czajkowski, M. J. Lopez Jimenez, Robert Grzywacz, J. C. Thomas, Marielle Chartier, M. Stanoiu, and B. A. Brown

Subjects
Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Detector, Coincidence, Nuclear physics, Decay energy, Beta particle, Physics::Accelerator Physics, High Energy Physics::Experiment, Proton emission, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip-line nucleus Fe45 has been studied after projectile fragmentation of a Ni58 primary beam at 75 MeV/nucleon impinging on a natural nickel target. Fragment-implantation events have been correlated with radioactive decay events in a 16x16 pixel silicon strip detector on an event-by-event basis. The decay-energy spectrum of Fe45 implants shows a distinct peak at (1.06+/-0.04)MeV with a half-life of T1/2 = (4.7+3.4-1.4)ms. None of the events in this peak is in coincidence with beta particles which were searched for in a detector next to the implantation detector. For a longer correlation interval, daughter decays of the two-proton daughter Cr43 can be observed after Fe45 implantation. The decay energy for Fe45 agrees nicely with several theoretical predictions for two-proton emission. Barrier-penetration calculations slightly favour a di-proton emission picture over an emission of two individual protons and point thus to a He2 emission mode.

Published
2003

44. Coupling of valence particles/holes to 68,70Ni studied via measurements of the B(E2) strength in 67,69,70Ni and 71Cu

Author

Bo Cederwall, Z. Dlouhy, M. Lewitowicz, H. Grawe, M. Stanoiu, Wlodzimierz Klamra, Birger Fogelberg, M. Pf▵zner, Henryk Mach, Robert Grzywacz, Yu. E. Penionzhkevich, M. Sawicka, J. Mrazek, F. Becker, S. M. Lukyanov, Milena Mineva, M.J.G. Berge, E. Ramström, R. Boutami, G. Georgiev, J. Blomqvist, L. M. Fraile, F. de Oliveir Santos, Gerda Neyens, and P.I. Johansson

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), Atomic physics
Abstract

Coupling of valence particles/holes to 68,70Ni studied via measurements of the B(E2) strength in 67,69,70Ni and 71Cu.

Published
2003

45. New region of deformation in the neutron-rich 60 24Cr36 and 62 24Cr38

Author

F. de Oliveira Santos, J. C. Angélique, B. Pfeiffer, Yu. E. Penionzhkevich, F. Ibrahim, S. Grévy, D. Guillemaud-Mueller, F. Nowacki, J. Mrasek, Karl Kratz, M. Lewitowicz, C. Donzaud, F. Azaiez, Z. Dlouhy, V. Chiste, F. Pougheon, M. Stanoiu, Alfredo Poves, S. M. Lukyanov, M. G. Saint-Laurent, O. Sorlin, C. Bourgeois, 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 de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Atomic orbital, 0103 physical sciences, medicine, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Random phase approximation, Spectroscopy, Nucleus
Abstract

The neutron-rich nuclei 23 60-63V have been produced at GANIL via interactions of a 61.8A·MeV 76Ge beam with a 58Ni target. Beta-decay to 24 60-63Cr has been investigated using combined β- and γ-ray spectroscopy. Half-lives of the 60-63V nuclei have been determined, and the existence of a beta-decay isomer in the 60V nucleus is strongly supported. The observation of low-energy 2+ states in 60Cr (646keV) and 62Cr (446keV) suggests that these isotopes are strongly deformed with β2 ∼ 0.3. This is confirmed by shell model calculations which show the dominant influence of the intruder g and d orbitals to obtain low 2+ energies in the neutron-rich Cr isotopes.

Published
2003

46. Experimental approach towards shell structure at 100Sn and 78Ni

Author

K. P. Rykaczewski, M. Sawicka, Robert Grzywacz, S. Leenhardt, M. Palacz, E. Caurier, F. Nowacki, J. M. Daugas, F. Azaiez, O. Sorlin, M. Lewitowicz, Claes Fahlander, H. Grawe, M. Górska, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-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 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 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), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Shell (structure), Conclusive evidence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Polarization (waves), 01 natural sciences, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Excitation
Abstract

The status of experimental approach to Sn-100 and Ni-78 is reviewed. Revised single particle energies for neutrons are deduced for the N=Z=50 shell closure and evidence for low lying I-pi=2(+) and 3(-) states is presented. Moderate E2 polarization charges of 0.1 e and 0.6 e are found to reproduce the experimental data when core excitation of Sn-100 is properly accounted for in the shell model. For the neutron rich Ni region no conclusive evidence for an N=40 subshell is found, whereas firm evidence for the persistence of the N=50 shell at Ni-78 is inferred from the existence of seniority isomers. The disappearance of this isomerism in the mid nug(9/2) shell is discussed.

Published
2002

47. g-factors of isomers around N≈40, Z≈28 from time-dependent Larmor precession on spin-aligned projectile-like fragments

Author

C. Borcea, Yu. E. Penionzkevich, Robert Grzywacz, Stéphanie Teughels, M. Pfützner, M. Lewitowicz, K. P. Rykaczewski, M. Sawicka, G. Georgiev, Yu. Sobolev, I. Macovei, Zsolt Podolyak, Katrien Vyvey, G. Goldring, R. D. Page, Romain Coussement, Henryk Mach, C. R. Bingham, N. A. Smirnova, C.D. O'Leary, F. de Oliveira Santos, Nico Coulier, D. L. Balabanski, J. M. Daugas, M. Górska, Gerda Neyens, H. Grawe, P. H. Regan, G. Defrance, and Michael Hass

Subjects
Physics, Larmor precession, Nuclear and High Energy Physics, Future studies, Fragmentation (mass spectrometry), Projectile, Time windows, Gyromagnetic ratio, Nuclear structure, Atomic physics, Ion
Abstract

First and preliminary results of an experiment aimed at measuring g -factors of isomeric states in neutron-rich nuclei in the vicinity of 68 Ni are reported. Isomers near the predicted N =40 sub-shell closure in 69 Cu, 67 Ni and 66 Co have been populated in the fragmentation of a 76 Ge, 61.4 MeV/u beam onto a 145 mg/cm 2 9 Be target at GANIL. Here we report the results for the 357(2) ns, I π =13/2 + isomer in 69 Cu for which a preliminary gyromagnetic ratio of | g |=0.195(9) was derived. The Larmor precession of the spin-oriented isomeric ensemble was measured by recording γ –ion correlations in a 20 μs time window. This pioneering experiment has indicated interesting nuclear structure information and shows promising possibilities for future studies of this kind.

Published
2002

48. Probing nuclear forces beyond the drip-line using the mirror nuclei N16 and F16

Author

M. Lenhardt, Thomas Davinson, Vincent Tatischeff, I. Stefan, S. Grévy, F. de Grancey, J. C. Thomas, Marek Ploszajczak, J. Mrazek, M. Stanoiu, R. Borcea, C. Stodel, J. C. Angelique, M. G. Pellegriti, M. G. Saint Laurent, I. Ray, O. Roig, M. Lewitowicz, F. de Oliveira Santos, J. M. Daugas, M. Fadil, G. Dumitru, M. Angélique, Jürgen Kiener, A. Lefebvre-Schuhl, C. Borcea, A. Buta, D. Pantelica, F. Negoita, L. Perrot, E. Berthoumieux, and O. Sorlin

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Nuclear Theory, Nuclear force, Neutron, Symmetry breaking, Mirror nuclei, Atomic physics, Nuclear Experiment
Abstract

Radioactive beams of $^{14}\mathrm{O}$ and $^{15}\mathrm{O}$ were used to populate the resonant states ${1/2}^{+}$, ${5/2}^{+}$ and ${0}^{\ensuremath{-}},{1}^{\ensuremath{-}},{2}^{\ensuremath{-}}$ in the unbound $^{15}\mathrm{F}$ and $^{16}\mathrm{F}$ nuclei, respectively, by means of proton elastic scattering reactions in inverse kinematics. Based on their large proton spectroscopic factor values, the resonant states in $^{16}\mathrm{F}$ can be viewed as a core of $^{14}\mathrm{O}$ plus a proton in the $2{s}_{1/2}$ or $1{d}_{5/2}$ shell and a neutron in $1{p}_{1/2}$. Experimental energies were used to derive the strength of the $2{s}_{1/2}$-$1{p}_{1/2}$ and $1{d}_{5/2}$-$1{p}_{1/2}$ proton-neutron interactions. It is found that the former changes by 40% compared with the mirror nucleus $^{16}\mathrm{N}$, and the latter changes by 10%. This apparent symmetry breaking of the nuclear force between mirror nuclei finds explanation in the role of the large coupling to the continuum for the states built on an $\ensuremath{\ell}=0$ proton configuration.

Published
2014

49. Status of the EURICA Project After One Year at RIKEN

Author

Plamen Boutachkov, Eiji Ideguchi, T. Isobe, Oliver Roberts, Pär-Anders Söderström, Rin Yokoyama, L. Sinclair, Roman Gernhäuser, Z Vajta, Y. F. Fang, Shunji Nishimura, Hidetada Baba, Chang-Bum Moon, Zhengyu Xu, Gi Dong Kim, A. Jungclaus, Atsuko Odahara, Yong-Kyun Kim, Young Kwan Kwon, Kevin Mochner, R. Wadsworth, Daniel Lubos, Jin Wu, Ivan Kojouharov, Jan Taprogge, Giovanna Benzoni, Ayumi Yagi, Zhong Liu, Kenta Yoshinaga, Guillaume Gey, Pieter Doornenbal, Radomira Lozeva, M. Lewitowicz, Frank Browne, Henning Schaffner, Hiroyoshi Sakurai, Nikolaus Kurz, R. Daido, Andrey Blazhev, Megumi Niikura, Gary Simpson, Christopher Townsley, Simon Rice, Alison Bruce, P. H. Regan, Z. Patel, Hyo-Soon Jung, Toshiyuki Sumikama, Giuseppe Lorusso, Zsolt Podolyak, Hiroshi Watanabe, and Zhihuan Li

Subjects
Physics
Published
2014

50. Shell structure of nuclei far from stability

Author

M. Lewitowicz, H. Grawe, Grand Accélérateur National d'Ions Lourds (GANIL), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Proton, Isotope, Nuclear Theory, SHELL model, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, Nuclear Experiment, Molecular physics, Line (formation)
Abstract

The experimental status of shell structure studies in medium-heavy nuclei far off the line of β -stability is reviewed. Experimental techniques, signatures for shell closure and expectations for future investigations are discussed for the key regions around 48,56 Ni, 100 Sn for proton rich nuclei and the neutron-rich N=20 isotones, Ca, Ni and Sn isotopes.

Published
2001

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