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1. 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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2. Coulomb and nuclear excitations of Zn70 and Ni68 at intermediate energy

Author

G. de Angelis, J. Mrazek, L. Perrot, R. Borcea, R. Astabatyan, F. Carstoiu, H. Guerin, M. Stanoiu, T. Roger, S. Grévy, L. Stuhl, C. Petrone, Zs. Podolyák, M. N. Harakeh, A. Lepailleur, J. C. Thomas, L. Cáceres, D. D. Dao, I. Stefan, F. Negoita, M. Krzysiek, A. Gottardo, V. Maslov, S. Bagchi, C. Borcea, Dóra Sohler, I. Matea, O. Wieland, Z. Vajta, F. Nowacki, M. Vandebrouck, P. Morfouace, F. Rotaru, S. Lukyanov, I. Kuti, O. Sorlin, Megumi Niikura, S. Franchoo, A. Krasznahorkay, K. Mazurek, Y. Penionzhkevich, M. Ciemála, A. Maj, Zsolt Dombrádi, C. Rigollet, M. Kmiecik, I. M. Harca, Eric Clément, O. Kamalou, S. Calinescu, and L. Olivier

Subjects
Physics, Proton, 010308 nuclear & particles physics, Prolate spheroid, 01 natural sciences, Spectral line, Intermediate energy, 0103 physical sciences, Oblate spheroid, Coulomb, Atomic physics, 010306 general physics, Beam energy, Excitation
Abstract

The reduced transition probabilities B ( E 2 ; 0 g.s. + → 2 1 + , 2 2 + ) in Zn 70 and the full B ( E 2 ; 0 g.s. + → 2 + ) strength up to S n = 7.79 MeV in Ni 68 have been determined at the LISE/GANIL facility using the Coulomb-excitation technique at intermediate beam energy on a Pb 208 target. The γ rays emitted in-flight were detected with an array of 46 BaF 2 crystals. The angles of the deflected nuclei were determined in order to disentangle and extract the Coulomb and nuclear contributions to the excitation of the 2 + states. The measured B ( E 2 ; 0 g.s. + → 2 1 + ) of 1432(124) e 2 fm 4 for Zn 70 falls in the lower part of the published values which clustered either around 1600 or above 2000 e 2 fm 4 , while the B ( E 2 ; 0 g.s. + → 2 2 + ) of 53(7) e 2 fm 4 agrees very well with the two published values. The relatively low B ( E 2 ; 0 g.s. + → 2 1 + ) of 301(38) e 2 fm 4 for Ni 68 agrees with previous studies and confirms a local magicity at Z = 28 , N = 40 . Combining the results of the low-energy spectra of Ni 68 and Zn 70 and their shell-model interpretations, it is interesting to notice that four different shapes (spherical, oblate, prolate, and triaxial) are present. Finally, a summed E 2 strength of only about 150 e 2 fm 4 has been found experimentally at high excitation energy, likely due to proton excitations across the Z = 28 gap. The experimental distribution of this high-energy E 2 excitation agrees with shell-model calculations, but its strength is about two times weaker.

Published
2021
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3. Break-up reactions of 6Li, 7Be and 8B

Author

T. Issatayev, S.M. Lukyanov, Yu.M. Sereda, A.G. Artukh, D. Aznabayev, C. Borcea, S. Calinescu, B. Erdemchimeg, B.M. Hue, A.M. Kabyshev, S.A. Klygin, G.A. Kononenko, K.A. Kuterbekov, K. Mendibayev, V.V. Ostashko, Yu.E. Penionzhkevich, F. Rotaru, T.D. Thiep, and A.N. Vorontsov

Subjects
Nuclear and High Energy Physics, Radiation, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, proton halo, Materials Science (miscellaneous), Physics::Accelerator Physics, breakup, Condensed Matter Physics, Nuclear Experiment, FWHM, lcsh:Physics, lcsh:QC1-999
Abstract

Secondary beams ( 6 Li, 7 Be, 8 B) were obtained by the separation of fragmentation products of a 15 N ion beam (50 MeV/A) impinging on a Be target using the COMBAS spectrometer. The secondary products were detected by a telescope consisting of five Si-detectors (dE) and a stop CsI(Tl) detector. The telescope allowed us to achieve unambiguous particle identification of fragments originating from incident secondary beams as well as their reaction products resulting from interaction with the Si detectors, chosen as a secondary target. This way, break-up reactions of 6 Li, 7 Be and 8 B have been studied in this experiment, in particular the longitudinal momentum distributions of 7 Be fragments in the break-up of 8 B on a Si have been measured at 30 MeV/A.

Published
2019

4. Coulomb and nuclear excitations of Zn 70 and Ni 68 at intermediate energy

Author

S. Calinescu, O. Sorlin, I. Matea, F. Carstoiu, D. D. Dao, F. Nowacki, G. de Angelis, R. Astabatyan, S. Bagchi, C. Borcea, R. Borcea, L. Cáceres, M. Ciemála, E. Clément, Z. Dombrádi, S. Franchoo, A. Gottardo, S. Grévy, H. Guerin, M. N. Harakeh, I. M. Harca, O. Kamalou, M. Kmiecik, A. Krasznahorkay, M. Krzysiek, I. Kuti, A. Lepailleur, S. Lukyanov, A. Maj, V. Maslov, K. Mazurek, P. Morfouace

Published
2021
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5. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

C. Petrone, C. Borcea, A. Maj, K. V. Novikov, G. N. Knyazheva, Emanuele Vardaci, V. V. Kirakosyan, A. Bracco, S. Brambilla, G. Sposito, D. Verney, I. M. Harca, D. Quero, K. Saveleva, John W. Wilson, A. Pulcini, S. Calinescu, I. V. Kolesov, M. Ciemala, O. Dorvaux, E. M. Kozulin, F. Camera, I. M. Itkis, O. Stezowski, M. Ashaduzzaman, B. de Canditiis, C. Schmitt, D. Pierroutsakou, A. Di Nitto, P. K. Rath, G. La Rana, C. Parascandolo, N. I. Kozulina, I. Matea, 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 Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics, Nuclear reaction, Angular momentum, Photon, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Spectrometer, Mass distribution, 010308 nuclear & particles physics, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, 0103 physical sciences, Nuclear Reactions, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasifission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The approach proposed here relies on the fact that fusion-fission and quasifission are characterized by different timescales. Within this framework, we performed a detailed study to find out how timescales can be probed via angular momentum transfer as measured via γ-ray multiplicities. The proof of principle was carried out by measuring the γ rays in coincidence with fusion-fission and quasielastic binary fragments in the reaction S32 + Au197 at beam energy near the Coulomb barrier. The experiment was performed at the Accélérateur Linéaire Tandem à Orsay (ALTO) facility at the Institut De Physique Nucléaire (IPN) in Orsay (France) using a detection setup consisting of ORGAM (ORsay GAMma) and PARIS (Photon Array Radioactive Ion Stable beams) γ-detectors arrays coupled with the CORSET (CORrelation SETup) time-of-flight spectrometer. Results of the sensitivity of this method to distinguish reaction channels with different dynamics are discussed.

Published
2020
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6. Features of the Fission Fragments Formed in the Heavy Ion induced $^{32}\hbox {S}$+$^{197}\hbox {Au}$ reaction near the interaction barrier

Author

G. N. Knyazheva, Emanuele Vardaci, O. Dorvaux, P.K. Rath, D. Verney, E. M. Kozulin, B. Decanditiis, S. Brambilla, E. Saveleva, D. Quero, G. La Rana, J. N. Wilson, S. Calinescu, N. I. Kozulina, C. Schmitt, I. M. Itkis, F. Camera, A. Bracco, K. V. Novikov, W. H. Trzaska, O. Stezowski, I. Matea, A. Pulcini, I. M. Harca, A. Di Nitto, M. Ciemala, V. V. Kirakosyan, C. Petrone, M. Ashaduzzaman, I. V. Kolesov, C. Borcea, A. Maj, 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), SPS, PARIS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Harca, I. M., Vardaci, E., Matea, I., Maj, A., Itkis, I., Knyazheva, G., Novikov, K., Dorvaux, O., Ciemala, M., Brambilla, S., Kozulina, N., Kolesov, I. V., Saveleva, E., Kirakosyan, V. V., Schmitt, C., Borcea, C., Calinescu, S., Petrone, C., Ashaduzzaman, M., Decanditiis, B., Pulcini, A., Quero, D., Rath, P., di Nitto, A., La Rana, G., Bracco, A., Camera, F., Stezowski, O., Wilson, J., Verney, D., and Trzaska, W. H.

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Semi-empirical mass formula, Yield (chemistry), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

International audience; The features of fission fragments formed in the near barrier reaction $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ ($E^\mathrm{lab}_\mathrm{beam}=166\,\hbox {MeV}$) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The $\gamma $-rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model.

Published
2020
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7. Break-Up Reactions of 6Li, 7Be and 8B

Author

Yu. M. Sereda, D. T. Aznabayev, Yu. E. Penionzhkevich, V. V. Ostashko, V. A. Maslov, C. Borcea, F. Saillant, A. G. Artukh, B. M. Hue, S. Calinescu, S. M. Lukyanov, A. N. Vorontsov, B. Erdemchimeg, Kairat Kuterbekov, F. Rotaru, S. A. Klygin, G. A. Kononenko, T. Issatayev, A. M. Kabyshev, Yu. G. Sobolev, M. A. Naumenko, T. D. Thiep, K. Mendibayev, Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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
Materials science, Spectrometer, Physics::Instrumentation and Detectors, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Particle identification, law.invention, Telescope, Fragmentation (mass spectrometry), Experiment-Nucl, law, Theory-Nucl, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract

International audience; Secondary beams (6Li,7Be,8B) obtained by separation of fragmentation products of 15N beam (50 A MeV) impinging on a Be target using COMBAS spectrometer. The secondary products will be detected by a telescope consisting of five Si-detectors (dE) and CsI(Tl) detector (Er). By the dE-E method, the telescope allowed us to achieve unambiguous particle identification originating from incident secondary beams as well as theirs reaction products resulting from reactions with one of Si detectors chosen as the target. Accordingly, break-up reactions of 6Li, 7Be and 8B were studied in this experiment.

Published
2019
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8. Normal and intruder configurations in Si34 populated in the β− decay of Mg34 and Al34

Author

Ph. Dessagne, Alin Titus Serban, J. Mrazek, J. Pakarinen, V. F. E. Pucknell, O. Sorlin, F. Negoita, P. Morfouace, Carmen Gheorghe, P. Rahkila, E. Rapisarda, C. Sotty, J. Konki, C. Borcea, Olof Tengblad, S. Franchoo, A. N. Andreyev, Ph Morel, A. Turturica, Paul Greenlees, H. M. Lazarus, F. Nowacki, S. Kisyov, A. Poves, M. Stanoiu, R. Mărginean, S. Grévy, R. E. Mihai, L. M. Fraile, Cosmin Teodor Mihai, J. M. Daugas, Thierry Stora, A. Ionescu, A. Negret, M. J. G. Borge, N. Marginean, L. Stan, S. Calinescu, R. Lica, R. Borcea, C. Costache, H. De Witte, István Kuti, Marc Huyse, D. M. Filipescu, R. D. Page, M. Madurga, P. Van Duppen, N. Warr, and F. Rotaru

Subjects
Physics, 010308 nuclear & particles physics, Neutron emission, 0103 physical sciences, SHELL model, Nuclear structure, Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The structure of $^{34}$Si was studied through $\gamma$ spectroscopy separately in the $\beta^-$ decays of $^{34}$Mg and $^{34}$Al at the ISOLDE facility of CERN. Different configurations in $^{34}$Si were populated independently from the two recently identified $\beta$-decaying states in $^{34}$Al having spin-parity assignments $J^\pi = 4^-$ dominated by the normal configuration $\pi (d_{5/2})^{-1} \otimes \nu (f_{7/2})$ and $J^\pi = 1^+$ by the intruder configuration $\pi (d_{5/2})^{-1} \otimes \nu (d_{3/2})^{-1}(f_{7/2})^{2}$. The paper reports on spectroscopic properties of $^{34}$Si such as an extended level scheme, spin and parity assignments based on log($ft$) values and $\gamma$-ray branching ratios, absolute $\beta$ feeding intensities and neutron emission probabilities. A total of 11 newly identified levels and 26 transitions were added to the previously known level scheme of $^{34}$Si. Large scale shell-model calculations using the {\sc sdpf-u-mix} interaction, able to treat higher order intruder configurations, are compared with the new results and conclusions are drawn concerning the predictive power of {\sc sdpf-u-mix}, the $N=20$ shell gap, the level of mixing between normal and intruder configurations for the 0$_1^+$, 0$_2^+$ and 2$_1^+$ states and the absence of triaxial deformation in $^{34}$Si.

Published
2019
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10. Fission and Quasi-Fission Dynamics Near the Coulomb Barrier: $\gamma$ Rays as Probe for their Timescale

Author

I. M. Itkis, C. Petrone, I. M. Harca, N. I. Kozulina, J. Wilson, P. K. Rath, A. Pulcini, B. de Canditiis, G. Sposito, O. Dorvaux, E. M. Kozulin, D. Quero, O. Stezowski, Wladyslaw Henryk Trzaska, C. Schmitt, I. V. Kolesov, A. Di Nitto, S. Calinescu, G. La Rana, F. Davide, S. Brambilla, E. Saveleva, F. Camera, M. Ashaduzzaman, V. V. Kirakosyan, A. Bracco, M. Ciemala, G. N. Knyazheva, S. N. Dmitriev, K. V. Novikov, Emanuele Vardaci, I. Matea, C. Borcea, A. Maj, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland, 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 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), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Penionzhkevich, Yu E, Yu G Sobolev, Pulcini, A., Vardaci, E., Kozulin, E. M., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., Davide, F., de Canditiis, B., Di Nitto, A., Dmitriev, S., Dorvaux, O., Harca, I. M., Itkis, I. M., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P. K., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., 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), 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 Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission, Experiment-Nucl, Dynamics (mechanics), Theory-Nucl, Coulomb barrier, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasi-fission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The method proposed here relies on the fact that fusion-fission and quasifission are characterized by a different timescale. Within this framework we performed a detailed study to find out if timescales can be probed via angular momentum as measured via γ rays multiplicity. The proof of principle was carried out by measuring the γ rays in coincidence with two fragments in the reaction 32S + 197Au at beam energy near the Coulomb barrier. The experiment has been performed at the Tandem ALTO facility at IPN Orsay using a detection setup consisting of ORGAM and PARIS γ detector arrays coupled with the CORSET time-of-flight spectrometer. Preliminary results on the sensitivity of this method to distinguish reaction channels with different dynamics are discusses.

Published
2018
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11. Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier

Author

A. Bracco, E. M. Kozulin, B. de Canditiis, Wladyslaw Henryk Trzaska, I. M. Itkis, C. Petrone, Emanuele Vardaci, V. V. Kirakosyan, P. K. Rath, I. M. Harca, I. Matea, G. Sposito, S. Calinescu, O. Stezowski, C. Schmitt, A. Pulcini, D. Quero, James R. Wilson, N. I. Kozulina, G. La Rana, E. Saveleva, G. N. Knyazheva, K. V. Novikov, S. Brambilla, F. Camera, I. V. Kolesov, M. Ciemala, M. Ashaduzzaman, O. Dorvaux, C. Borcea, A. Maj, Giuseppe Mandaglio, Antonio Trifirò, Marina Trimarchi, Pulcini, A., Vardaci, E., Kozulin, E., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., De Canditiis, Bartolomeo, Dorvaux, O., Harca, I. M., Itkis, I., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., 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), 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 de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Mandaglio, Giuseppe, Trifirò, Antonio, and Trimarchi, Marina

Subjects
Physics, History, Angular momentum, Spectrometer, 010308 nuclear & particles physics, Fission, Detector, gamma radiation, Gamma ray, Coulomb barrier, gammasäteily, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Computer Science Applications, Education, Nuclear physics, nuclear fission, fissio, nuclear physics, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, ydinfysiikka, Nuclear Experiment
Abstract

International audience; Compound nucleus fission and quasi-fission are both binary decay channels whose common properties make the experimental separation between them difficult. A way to achieve this separation could be to probe the angular momentum of the binary fragments. This can be done detecting gamma rays in coincidence with the two fragments. As a case study, the reaction 32S + 197Au near the Coulomb barrier has been performed at the Tandem ALTO facility at IPN ORSAY. ORGAM and PARIS, two different gamma detectors arrays, are coupled with the CORSET detector, a two-arm time-of-flight spectrometer. TOF-TOF data were analyzed to reconstruct the mass-energy distribution of the primary fragments coupled with gamma multiplicity and spectroscopic analysis. Preliminary results of will be shown.

Published
2018
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12. 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
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13. Multifaceted Quadruplet of Low-Lying Spin-Zero States in Ni66 : Emergence of Shape Isomerism in Light Nuclei

Author

A. Negreţ, C. Mihai, N. Florea, S. Leoni, S. Pascu, A. Mitu, Yusuke Tsunoda, L. Stroe, C. R. Niţă, S. Calinescu, I. Stiru, Ł. W. Iskra, C. Petrone, G Porzio, P. Petkov, B. Fornal, Rares Suvaila, Alin Titus Serban, N. Cieplicka-Oryǹczak, A. Olacel, Takaharu Otsuka, A. Turturica, G. Bocchi, S. Aydin, L. Stan, M. Boromiza, T. Glodariu, S. Ujeniuc, C. Sotty, A. Ionescu, Michele Sferrazza, R.E. Mihai, N. Marginean, C. A. Ur, M. Krzysiek, D. Bucurescu, F. C. L. Crespi, A. Bracco, S. Toma, C. Costache, A. Oprea, D. Ghiţă, and R. Marginean

Subjects
Physics, Light nucleus, 010308 nuclear & particles physics, SHELL model, Zero (complex analysis), General Physics and Astronomy, State (functional analysis), Prolate spheroid, 01 natural sciences, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Spin (physics), Energy (signal processing)
Abstract

A search for shape isomers in the ^{66}Ni nucleus was performed, following old suggestions of various mean-field models and recent ones, based on state-of-the-art Monte Carlo shell model (MCSM), all considering ^{66}Ni as the lightest nuclear system with shape isomerism. By employing the two-neutron transfer reaction induced by an ^{18}O beam on a ^{64}Ni target, at the sub-Coulomb barrier energy of 39 MeV, all three lowest-excited 0^{+} states in ^{66}Ni were populated and their γ decay was observed by γ-coincidence technique. The 0^{+} states lifetimes were assessed with the plunger method, yielding for the 0_{2}^{+}, 0_{3}^{+}, and 0_{4}^{+} decay to the 2_{1}^{+} state the B(E2) values of 4.3, 0.1, and 0.2 Weisskopf units (W.u.), respectively. MCSM calculations correctly predict the existence of all three excited 0^{+} states, pointing to the oblate, spherical, and prolate nature of the consecutive excitations. In addition, they account for the hindrance of the E2 decay from the prolate 0_{4}^{+} to the spherical 2_{1}^{+} state, although overestimating its value. This result makes ^{66}Ni a unique nuclear system, apart from ^{236,238}U, in which a retarded γ transition from a 0^{+} deformed state to a spherical configuration is observed, resembling a shape-isomerlike behavior.

Published
2017
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14. The reaction $^{32}$S + $^{197}$Au near the interaction barrier

Author

P. K. Rath, W. H. Trzaska, M. Ciemala, I. Matea, A. Pulcini, S. Brambilla, G. N. Knyazheva, G. Sposito, Emanuele Vardaci, E. M. Kozulin, G. La Rana, D. Quero, I. V. Kolesov, F. Camera, C. Borcea, A. Maj, N. I. Kozulina, John W. Wilson, B. Decanditiis, O. Stezowski, V. V. Kirakosyan, M. Ashaduzzaman, C. Schmitt, K. V. Novikov, O. Dorvaux, E. Saveleva, I. M. Harca, A. Bracco, I. M. Itkis, S. Calinescu, C. Petrone, 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), 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 de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), PARIS, 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), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Range (particle radiation), Calorimeter (particle physics), ta114, Fission, Transactinide element, Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, Ion, Nuclear physics, fissio, fuusio, ydinreaktiot, prompt y-rays, quasifission, Nuclear reactions, Atomic physics, fysiikka, Nuclear Experiment, physics, fussion-fission
Abstract

International audience; The path to the synthesis of super heavy elements is strongly hindered by the competition between fusion and quasi-fission in heavy ions reactions at near barrier energies. We report on a recent experimental investigation performed at the ALTO facility of IPN Orsay, France on the heavy-ion collision around the Coulomb barrier of 32S+197Au. The fission-fragment mass and total kinetic energy were measured by the double arm mass spectrometer for binary fragments CORSET, using the double time of flight approach. The asymmetric structure on top of the predominant symmetric one may suggests the contribution from either quasi-fission or pre-equilibrium fission or might be driven by shell effects in the compound nucleus fission. To get further insight on such puzzling cases situated at the crossroads of the various opened channels, we extended the measurement to coincident prompt γ -rays, of low and high energy. For this purpose, the prompt γ-rays following fission were detected by the coupled high efficiency ORGAM array consisting of 10 Compton suppressed Germanium detectors (BGO shielded), located at backward angles and the first cluster of the future PARIS calorimeter consisting of 9 close packed phoswich detectors and another single phoswich, together covering a wide angular and energy range.

Published
2016
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15. FUSION AND BREAKUP FUSION OF $^6$Li WITH $^{194}$Pt AT ENERGIES AROUND COULOMB BARRIER

Author

Ph. Dessagne, C. Petrone, R. Margineanu, F. Rotaru, C. Borcea, Yu. E. Penionzhkevich, S. M. Lukyanov, G. Suliman, M. P. Ivanov, M. Stanoiu, Yu. G. Sobolev, A. Negret, M. Kerveno, R. Borcea, N. K. Skobelev, A. Buta, A. Olacel, S. Calinescu, 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), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear physics, Fusion, Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, Fusion and breakup fusion, 7. Clean energy
Abstract

International audience; Results for fusion and breakup fusion reaction 6Li+194Pt are presented and compared with other experimental data and model calculations. A strong isotopic effect is observed when comparing our data with results from 6Li+198Pt.

Published
2016
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16. Challenging fission dynamics around the barrier: The case of $^{34}$S + $^{186}$W

Author

F. Hanappe, S. Calinescu, A. Gottardo, F. Azaiez, I. M. Harca, K. V. Novikov, E. M. Kozulin, I. M. Itkis, O. Dorvaux, Wladyslaw Henryk Trzaska, D. Verney, T. Loktev, Emanuele Vardaci, J. Piot, G. N. Knyazheva, C. Schmitt, I. Matea, A. A. Bogachev, C. Borcea, G. G. Chubarian, S. N. Dmitriev, C. Petrone, 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Vardaci, Emanuele, Harca, I. M., Schmitt, C., Itkis, I., Knyazheva, G., Novikov, K., Bogachev, A., Dmitriev, S., Loktev, T., Azaiez, F., Matea, I., Verney, D., Gottardo, A., Dorvaux, O., Piot, J., Chubarian, G., Trzaska, W. H., Hanappe, F., Borcea, C., Calinescu, S., and Petrone, C.

Subjects
Physics, Nuclear and High Energy Physics, Field (physics), 010308 nuclear & particles physics, Fission, Hadron, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collision, Kinetic energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract

The current status of fission dynamics studies in heavy-ion collisions around the Coulomb barrier is illustrated with the 34S + 186W reaction. The fission-fragment mass and total kinetic energy were measured at the ALTO facility at IPN Orsay, France, with a dedicated set-up using the (v, E) approach. The measurement reveals the presence of an asymmetric fission component on top of a predominantly symmetric distribution. The asymmetric structure, pointed out for the first time, is discussed along with results of previous experiments studying the same reaction. While these analyses suggested the contribution from either quasi-fission or pre-equilibrium fission, we offer an alternative interpretation, in terms of shell-driven compound-nucleus fission. The present measurement demonstrates the critical influence of resolution when addressing puzzling cases, situated at the crossroads of the various channels opened in a heavy-ion collision. Current status in the field clearly calls for innovative measurements involving manifold correlations and new observables. The outcome of the attempt done in this work in this direction, based on the coincident measurement of prompt \( \gamma\)-rays is reported, and encouraging perspectives are discussed.

Published
2016
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17. Nearly degenerate isomeric states ofCu75

Author

M. Stanoiu, L. Gaudefroy, R. Borcea, O. Sorlin, O. Kamalou, C. Plaisir, S. Calinescu, F. Rotaru, C. Petrone, C. Borcea, T. Faul, G. Gey, J. C. Thomas, G. S. Simpson, L. Caceres, R. Chevrier, J. M. Daugas, F. Negoita, and G. Georgiev

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, 0103 physical sciences, Degenerate energy levels, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The decays of two isomeric states in the neutron-rich nucleus $^{75}\mathrm{Cu}$ have been studied via delayed $\ensuremath{\gamma}$-ray spectroscopy. These states were populated by the fragmentation of a $60.4\phantom{\rule{4pt}{0ex}}A\phantom{\rule{0.16em}{0ex}}\mathrm{MeV} ^{86}\mathrm{Kr}$ primary beam, which impinged on a Be target at the LISE2k spectrometer of GANIL. Isomeric half-lives and branching ratios were measured, and a $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence analysis performed. These have allowed a revised level scheme of $^{75}\mathrm{Cu}$ to be proposed. A comparison with large-scale shell-model calculations using different effective interactions and valence spaces shows the importance of proton excitations across the $Z=28$ shell gap for reproducing the energy spacing between the isomeric states. The coexisting collective and single-particle properties of the $(1/{2}^{\ensuremath{-}})$ and $(3/{2}^{\ensuremath{-}})$ states, respectively, are similar to those of the same states in the neighboring $^{69,71,73}\mathrm{Cu}$. The small energy spacings between the $(1/{2}^{\ensuremath{-}}), (3/{2}^{\ensuremath{-}})$, and $5/{2}^{\ensuremath{-}}$ states are responsible for the isomerism.

Published
2016
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18. Coulomb excitation ofCa44andAr46

Author

E. Wilson, P. Morfouace, István Kuti, S. Franchoo, T. Roger, Zsolt Dombrádi, J. Mrazek, Megumi Niikura, C. Petrone, W. N. Catford, Zs. Podolyák, O. Sorlin, I. Stefan, S. Calinescu, S. M. Lukyanov, R. Garcia, L. Perrot, M. Bowry, V. A. Maslov, R. A. Astabatyan, Dóra Sohler, Emyr Clement, F. Negoita, S. Grévy, Yu. Penionzhkevich, I. H. Guerin, Zs. Vajta, R. Borcea, C. Borcea, J. C. Thomas, M. Stanoiu, A. Lepailleur, R. Gillibert, F. Rotaru, and L. Caceres

Subjects
Physics, Intermediate energy, 010308 nuclear & particles physics, Drop (liquid), 0103 physical sciences, SHELL model, Coulomb excitation, Atomic physics, 010306 general physics, 01 natural sciences
Abstract

The reduced transition probabilities B(E2; 0+ g.s. → 2+ 1 ) of the 46Ar and 44Ca nuclei were studied using the Coulomb excitation technique at intermediate energy at the LISE/GANIL facility. The in-flight γ rays, emitted after the Coulomb excitation of their first 2+ states, were detected in an array of 64 BaF2 crystals. The present B(E2 ↑) value for 44Ca, 475(36) e2fm4 , agrees well with the value of 495(35) e2fm4 obtained by averaging results of previous experiments. Consistent B(E2; 0+ g.s. → 2+ 1 ) values of 225(29) e2fm4 and 234(19) e2fm4 have been obtained for 46Ar from an absolute and a relative measurement, normalized to the 44Ca value. Both results agree with the ones obtained with the same experimental technique at the NSCL facility but are a factor of 2 smaller than the shell model predictions. The drop in B(E2; 0+ g.s. → 2+ 1 ) in the Ar chain at N = 28, confirmed in this experiment, shows that 46Ar is sensitive to the N = 28 shell closure.

Published
2016
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19. Properties of Intruder States in 34Al and 34Si

Author

J. M. Daugas, F. Rotaru, F. Negoita, Ph. Dessagne, J. Mrazek, A. Negret, S. Toma, D. M. Filipescu, Thierry Stora, L. M. Fraille, T. Sava, István Kuti, Ioana Gheorghe, M. Stanoiu, D. Pietreanu, D. Sohler, P. Morfouace, R. Mărginean, S. Calinescu, S. Franchoo, N. Marginean, I. Stefan, C. Borcea, Cosmin Teodor Mihai, Ph Morel, R. Suvaila, R. Lica, R. Borcea, and S. Grévy

Subjects
Physics, Database, computer.software_genre, computer
Published
2015
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20. Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

Author

R. Lica, R. Borcea, Thierry Stora, F. Negoita, R. Mărginean, D. Pietreanu, Ph. Desagne, A. Negret, I. Stefan, C. Mihai, S. Calinescu, D. Ghita, D. M. Filipescu, T. Sava, C. Borcea, L. M. Fraile, I. Kuti, S. Grévy, S. Franchoo, P. Morel, C. A. Ur, R. Suvaila, M. Stanoiu, F. Rotaru, S. Toma, J. Mrazek, J. M. Daugas, N. Marginean, Ioana Gheorghe, D. Sohler, and P. Mourface

Subjects
Island of inversion, Chemistry, Excited state, Gamma spectroscopy, Isotopes of silicon, Atomic physics, Spectroscopy, Beta decay, Isotopes of magnesium, Radioactive decay
Abstract

The results of the IS530 experiment at ISOLDE revealed new information concerning several nuclei close to the N ≈ 20 'Island of Inversion' - 34Mg, 34Al, 34Si. The half-life of 34Mg was found to be three times larger than the adopted value (63(1) ms instead of 20(10) ms). The beta-gamma spectroscopy of 34Mg performed for the first time in this experiment, led to the first experimental level scheme for 34Al, also showing that the full beta strength goes through the predicted 1+ isomer in 34Al [1] and/or excited states that deexcite to it. The subsequent beta-decay of the 1+ isomer in 34Al allowed the observation of new gamma lines in 34Si, (tentatively) associated with low-spin high-energy excited states previously unobserved.

Published
2015
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21. Study of the neutron-rich isotope $^{46}$Ar through intermediate energy Coulomb excitation

Author

E. Wilson, J. C. Thomas, C. Borcea, J. Mrazek, O. Sorlin, Zsolt Podolyak, Y. E. Penionzhkevich, R. Garcia, R. Gillibert, Dóra Sohler, S. M. Lukyanov, L. Perrot, Zs. Vajta, Zsolt Dombrádi, István Kuti, W. N. Catford, F. Negoita, V. A. Maslov, S. Grévy, I. Stefan, P. Morfouace, R. Borcea, M. Bowry, S. Calinescu, S. Franchoo, F. Rotaru, R. A. Astabatyan, M. Stanoiu, A. Lepailleur, Emyr Clement, M. Niikura, H. Guerin, C. Petrone, L. Caceres, T. Roger, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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)-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), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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, 27.40.+z, 25.70.De, Isotope, 010308 nuclear & particles physics, General Physics and Astronomy, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Fragmentation (mass spectrometry), Intermediate energy, 0103 physical sciences, medicine, Neutron, Atomic physics, 010306 general physics, Nucleus
Abstract

Expérience GANIL/LISE3/CATS; International audience; The preliminary value of the reduced transition probability B(E2; 0+ ! 2+1 ) in 46Ar has been determined using the Coulomb excitation technique at intermediate energy. The 46Ar was produced in the fragmentation of a 48Ca beam at GANIL. The -rays following the Coulomb excitation of the 2+1 were emitted in-flight and detected by the 64 BaF2 detectors of the Château de Cristal array. The relatively low B(E2) value of 46Ar reported in this article supports the semi-magic character of this nucleus due to the persistence of the N = 28 shell closure at Z = 18.

Published
2013
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23. Study of the neutron rich sulfure isotope 43S through intermediate energy Coulomb excitation

Author

István Kuti, L. Caceres, Zsolt Podolyak, C. Petrone, J. C. Thomas, S. Franchoo, S. M. Lukyanov, D. Sohler, R. Gillibert, E. Wilson, T. Roger, Megumi Niikura, J. Mrazek, I. Stefan, Zsolt Dombrádi, Y. E. Penionzhkevich, F. Rotaru, S. Grévy, Zs. Vajta, S. Calinescu, M. Bowry, O. Sorlin, W. N. Catford, F. Negoita, M. Stanoiu, A. Lepailleur, R. Borcea, and C. Borcea

Subjects
History, Spectrometer, Isotope, Chemistry, SHELL model, Fizikai tudományok, Coulomb excitation, Computer Science Applications, Education, medicine.anatomical_structure, Intermediate energy, Fragmentation (mass spectrometry), Természettudományok, medicine, Neutron, Atomic physics, Nuclear Experiment, Nucleus
Abstract

The reduced transition probability B(E2: 3/2→7/2 ) has been measured in S using Coulomb excitation at intermediate energy. The nucleus of interest was produced by fragmentation of a Ca beam at GANIL. The reaction products were separated in the LISE spectrometer. After Coulomb-excitation of S in a Pb target, the γ rays emitted inflight were detected by 64 BaF detectors of the Chteau de Cristal array. The preliminary value deduced for the reduced transition probability B(E2: 3/2 →7/2 ) is in agreement with the predictions of the shell model calculations and supports a prolate-spherical shape coexistence in the S nucleus.

Published
2013

24. Unveiling the Intruder Deformed02+State inSi34

Author

A. Buta, R. Borcea, C. Petrone, L. Caceres, D. Lebhertz, S. Calinescu, O. Sorlin, J. C. Thomas, S. Grévy, Alfredo Poves, J. Mrazek, R. Chevrier, J. M. Daugas, S. M. Lukyanov, M. Stanoiu, F. Rotaru, D. Sohler, Frédéric Nowacki, Y. E. Penionzhkevich, C. Borcea, Zs. Dombrádi, and F. Negoita

Subjects
Czech, 010308 nuclear & particles physics, Romanian, Foundation (engineering), General Physics and Astronomy, State (functional analysis), 01 natural sciences, language.human_language, Political science, Double beta decay, 0103 physical sciences, language, 010306 general physics, Humanities
Abstract

This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support

Published
2012
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25. Shape coexistence at N=20 and N=28 : study of 0+2 states in $^{34}$Si and $^{44}$S

Author

F. Azaiez, F. de Oliveira, R. Chevrier, B. Bastin, J. M. Daugas, F. Rotaru, O. Sorlin, J. C. Angélique, D. Lebhertz, I. Stefan, Zs. Dombrádi, S. M. Lukyanov, R. Borcea, L. Caceres, A. Buta, L. Gaudefroy, C. Stodel, F. Negoita, N. L. Achouri, S. Grévy, C. Force, Y. E. Penionzhkevich, S. Calinescu, Dóra Sohler, C. Petrone, J. C. Thomas, Alfredo Poves, J. Mrazek, C. Borcea, F. Nowacki, M. Stanoiu, 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), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut 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 de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique 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), Sivaramakrishnan Muralithar, 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), 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 Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Condensed matter physics, Island of inversion, Chemistry, Magic (programming), Nuclear structure, Theoretical models, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 23.35.+g, 23.40.-s, 23.20.Lv, 25.70.Mn, 27.30.+t, 27.40.+z, 29.30.Kv, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, Ground state, Spectroscopy
Abstract

Expérience GANIL/LISE3/EXOGAM; International audience; It is well known that the nuclear shell structure changes for the most exotic nuclei. One of the consequences ofthis phenomenon is the modification of the "classical" magic numbers, as experimentally observed at N = 20 and N = 28.Nevertheless, the mechanisms responsible for such changes are still under discussion and more experimental information isneeded to better constrain the theoretical models. In these proceedings, we report on the discovery and the experimental studyby precise spectroscopy experiments of the 0+2 state in 34Si and 44S. The 34Si is located between the magic spherical 36S andthe deformed 32Mg, member of the so-called island of inversion, whereas 44S is located between the magic spherical 48Caand the deformed 42Si. Therefore, the structure of these nuclei, and in particular the phenomenon of shape coexistence, isof crucial importance to understand how the intruder configurations progressively dominate the ground state structure of themost exotic nuclei at both N = 20 and N = 28.

Published
2012
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26. Unveiling the intruder deformed 02+ state in 34Si

Author

F, Rotaru, F, Negoita, S, Grévy, J, Mrazek, S, Lukyanov, F, Nowacki, A, Poves, O, Sorlin, C, Borcea, R, Borcea, A, Buta, L, Cáceres, S, Calinescu, R, Chevrier, Zs, Dombrádi, J M, Daugas, D, Lebhertz, Y, Penionzhkevich, C, Petrone, D, Sohler, M, Stanoiu, J C, Thomas, and UAM. Departamento de Física Teórica

Subjects
Simultaneous detection, Física, Large deformations, Electric monopole strength, Shell gap, Shell models, Weak-mixing
Abstract

The 02+ state in Si34 has been populated at the GANIL-LISE3 facility through the β decay of a newly discovered 1 + isomer in Al34 of 26(1) ms half-life. The simultaneous detection of e +e - pairs allowed the determination of the excitation energy E(02+)=2719(3)keV and the half-life T 1/2=19.4(7)ns, from which an electric monopole strength of ρ2(E0)=13.0(0.9)×10 -3 was deduced. The 21+ state is observed to decay both to the 01+ ground state and to the newly observed 02+ state [via a 607(2) keV transition] with a ratio R(21+→01+/21+→02+)=1380(717). Gathering all information, a weak mixing with the 01+ and a large deformation parameter of β=0.29(4) are found for the 02+ state, in good agreement with shell model calculations using a new sdpf-u-mix interaction allowing np-nh excitations across the N=20 shell gap, This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support

Published
2012

27. Low energy isomeric levels of nuclei near N=40

Author

G. Georgiev, L. Gaudefroy, L. Caceres, G. S. Simpson, R. Chevrier, C. Plaisir, J. M. Daugas, G. Gey, S. Calinescu, F. Negoita, J. C. Thomas, C. Borcea, C. Petrone, F. Rotaru, O. Sorlin, R. Borcea, and M. Stanoiu

Subjects
Physics, Nuclear physics, History, Low energy, Fragmentation (mass spectrometry), Nuclear Theory, Neutron, Parity (physics), Atomic physics, Nuclear Experiment, Excitation, Computer Science Applications, Education
Abstract

We present the results of an experiment in which the structure of neutron-rich nuclei located in the vicinity of N=40 was studied. The importance of our results comes from the fact that knowing the behaviour of the neutron g9/2 orbital with increasing number of neutrons is one of the key points in defining the structure of these nuclei at low excitation energy. The nuclei of interest were produced by fragmentation of a 86Kr beam at 60MeV/u on a thick Be target at GANIL (France). Preliminary results on 75Cu and 78Ga isomers will be presented together with tentative spin and parity assignments.

Published
2013
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28. Gamma Spectroscopy of Low-energy Isomeric States in Neutron-rich Nuclei: 75Cu

Author

Georgi P. Georgiev, G. S. Simpson, F. Negoita, C. Petrone, R. Borcea, L. Gaudefroy, O. Sorlin, L. Caceres, R. Chevrier, C. Plaisir, O. Kamalou, Guillaume Gey, J. M. Daugas, S. Calinescu, M. Stanoiu, C. Borcea, F. Rotaru, and J. C. Thomas

Subjects
Nuclear physics, Physics, Low energy, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, Gamma spectroscopy, Neutron, 010306 general physics, 01 natural sciences
Published
2013
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29. L'effet de la nisine comparativement à celui du perhydrol sur la prévention du gonflement butyrique et sur la valeur nutritive du fromage Edam

Author

E. Mavromati, Z. Barduta, C. Toma, S. Calinescu, E. Moldovan, I. Gontzea, and Revues Inra, Import

Subjects
[SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, [SDV.IDA] Life Sciences [q-bio]/Food engineering, Food Science
Abstract

L'utilisation des fourrages mal ensiles et des divers sous-produits vegetaux dans l'alimentation des vaches laitieres, modifie le nombre des germes dans le lait, et surtout l'espece de la flore microbienne, en faisant augmenter l'incidence des bacteries anaerobies sporulees (Cl. butyricum, Cl. Tyrobutyricum, Cl. sporogenes, etc.). En etant capables de transformer l'acide lactique et l'acide acetique en acide butyrique et en gaz (C02, H2) ces bacteries provoquent beaucoup de difficultes aux fabriques de fromages a pâte cuite et demi-cuite (Emmental, Gouda, Edam, etc.) a cause de l'apparition de proprietes organoleptiques (odeur, gout), fort desagreables, accompagnees du gonflement de ces produits, ce qui les rend impropres a la consommation. Dans les echantillons d'Emmental, prepare a partir de lait obtenu d'animaux fourrages exclusivement au foin, on a trouve de nombreuses bacteries butyriques sans en constater le gonflement ou la modification des qualites sensorielles. Certains chercheurs en ont deduit que les fourrages ensiles, contiennent un facteur inconnu, ou bien une biocenose speciale qui favorise l'alteration alors que d'autres considerent que celle-ci est provoquee seulement par la presence du Cl. tyrobutyricum, les bacteries butyriques habituelles n'etant pas nuisibles ou incomparablement moins nocives [7, 29, 48].

Published
1973

31. Break-up reactions of6Li,7Be and8B

Author

T. .. Issatayev, S. M. Lukyanov, Yu. M. Sereda, A. G. Artukh, D. .. Aznabayev, C. .. Borcea, S. .. Calinescu, B. .. Erdemchimeg, B. M. Hue, A. M. Kabyshev, S. A. Klygin, G. A. Kononenko, K. A. Kuterbekov, K. .. Mendibayev, V. V. Ostashko, Yu. E. Penionzhkevich, F. .. Rotaru, T. D. Thiep, and A. N. Vorontsov

Subjects
breakup, proton halo, fwhm, Physics, QC1-999
Abstract

Secondary beams (6Li,7Be,8B) were obtained by the separation of fragmentation products of a15N ion beam (50 MeV/A) impinging on a Be target using the COMBAS spectrometer. The secondary products were detected by a telescope consisting of five Si-detectors (dE) and a stop CsI(Tl) detector. The telescope allowed us to achieve unambiguous particle identification of fragments originating from incident secondary beams as well as their reaction products resulting from interaction with the Sidetectors, chosen as a secondary target. This way, break-up reactions of6Li,7Be and8B have been studied in this experiment, in particular the longitudinal momentum distributions of7Be fragments in the break-up of8B on a Si have been measured at 30 MeV/A.

Published
2021
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32. Fusion and breakup fusion of6Li with194Pt at energies around coulomb barrier

Author

C. .. Petrone, S. .. Calinescu, C. .. Borcea, A. .. Buta, R. .. Borcea, R. .. Margineanu, A. .. Negret, A. .. Olacel, F. .. Rotaru, M. .. Stanoiu, G. .. Suliman, Yu. E. Penionzhkevich, Yu. G. Sobolev, S. M. Lukyanov, N. K. Skobelev, M. P. Ivanov, Ph. .. Dessagne, and M. .. Kerveno

Subjects
Physics, QC1-999
Abstract

Results for fusion and breakup fusion reaction ( 6 Li+ 194 Pt) are presented and compared with other experimental data and model calculations. A strong isotopic effect is observed when comparing our data with results from ( 6 Li+ 198 Pt)

Published
2021
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33. Unveiling the intruder deformed 02(+) state in 34Si.

Author

Rotaru F, Negoita F, Grévy S, Mrazek J, Lukyanov S, Nowacki F, Poves A, Sorlin O, Borcea C, Borcea R, Buta A, Cáceres L, Calinescu S, Chevrier R, Dombrádi Z, Daugas JM, Lebhertz D, Penionzhkevich Y, Petrone C, Sohler D, Stanoiu M, and Thomas JC

Abstract

The 02(+) state in 34Si has been populated at the GANIL-LISE3 facility through the β decay of a newly discovered 1(+) isomer in 34Al of 26(1) ms half-life. The simultaneous detection of e(+)e(-) pairs allowed the determination of the excitation energy E(02(+))=2719(3)  keV and the half-life T(1/2)=19.4(7) ns, from which an electric monopole strength of ρ(2)(E0)=13.0(0.9)×10(-3) was deduced. The 2(1)(+) state is observed to decay both to the 0(1)(+) ground state and to the newly observed 0(2)(+) state [via a 607(2) keV transition] with a ratio R(2(1)(+)→0(1)(+)/2(1)(+)→0(2)(+))=1380(717). Gathering all information, a weak mixing with the 0(1)(+) and a large deformation parameter of β=0.29(4) are found for the 0(2)(+) state, in good agreement with shell model calculations using a new SDPF-U-MIX interaction allowing np-nh excitations across the N=20 shell gap.

Published
2012
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