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11 results on '"Borcea, Ruxandra"'

2. Measurement of the Radiative-Decay Probability of the Hoyle State.

Author

Sakanashi, Kosuke, Kawabata, Takahiro, Furuno, Tatsuya, Tamii, Atsushi, Niina, Rei, Okamoto, Shintaro, Ito, Masatoshi, Adachi, Satoshi, Akimune, Hidetoshi, Matsuda, Yohei, Kubono, Shigeru, Aogaki, Soichiro, Soöderstroöm, Pär-Anders, Teodora, Madgearu, Pai, Haridas, Cuciuc, Mihai, Tescov, Dmitry, Borcea, Ruxandra, Turturica, Andrei, and Mihai, Constantin

Subjects
RADIOACTIVE decay, CARBON isotopes, PARTICLES (Nuclear physics), PROBABILITY theory, SCATTERING (Physics)
Abstract

The radiative-decay probability of the Hoyle state is actually controversial because new data which contradicts the currently adopted value has been recently reported. In this work, we performed the new reliable measurement of the radiative-decay probability of the Hoyle state. We successfully obtained 40 triplecoincidence events of scattered α particles, recoil 12C, and emitted γ rays for the first time. Further analysis will determine the radiative-decay probability, and puzzle over the radiative-decay probability. [ABSTRACT FROM AUTHOR]

Published
2024
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3. A γ-Ray Detector Based on a 3” LaBr3:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction

Author

Agnolin, Marco, primary, Di Vita, Davide, additional, Borghi, Giacomo, additional, Carminati, Marco, additional, Camera, Franco, additional, Wieland, Oliver, additional, Million, Bénédicte, additional, Giaz, Agnese, additional, Mihai, Constantin, additional, Turturica, Andrei, additional, Costache, Cristian, additional, Borcea, Ruxandra, additional, Söderström, Pär-Anders, additional, Ban, Rebeca Sara, additional, and Fiorini, Carlo, additional

Published
2023
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4. Nuclear Structure Investigations in Yb isotopes

Author

Zyriliou, Aikaterini, primary, Mertzimekis, Theo J., additional, Chalil, Achment, additional, Vasileiou, Polytimos, additional, Pelonis, Stefanos, additional, Efstathiou, Margarita, additional, Stan, Lucian, additional, Turturica, Andrei, additional, Costache, Cristian, additional, Mihai, Radu, additional, Borcea, Ruxandra, additional, Ujeniuc, Sorin, additional, Toma, Sebastian, additional, Clisu, Cristina, additional, Oprea, Andreea, additional, Ionescu, Alina, additional, Gheorghe, Ioana, additional, Boromiza, Marian, additional, Mihai, Constantin, additional, Sotty, Christophe, additional, Nita, Christina, additional, Marginean, Nicolae, additional, Marginean, Raluca, additional, Florea, Nicoleta, additional, Dinescu, Irina, additional, Bucurescu, Dorel, additional, Filipescu, Dan, additional, Lica, Razvan, additional, Stroe, Lucian, additional, and Suvaila, Rares, additional

Published
2022
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5. A γ-Ray Detector Based on a 3” LaBr3:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction

Author

Agnolin, Marco, Di Vita, Davide, Borghi, Giacomo, Carminati, Marco, Camera, Franco, Wieland, Oliver, Million, Benedicte, Giaz, Agnese, Mihai, Constantin, Turturica, Andrei, Costache, Cristian, Borcea, Ruxandra, Soderstrom, Par-Anders, Ban, Rebeca Sara, and Fiorini, Carlo

Abstract

We report the validation in an extended energy range (80 keV– $\simeq 16$ MeV) of the GAMMA detector, a high-dynamic range, high-resolution, gamma-ray spectrometer for nuclear physics applications based on a 3 co-doped lanthanum bromide (LaBr3:Ce:Sr) crystal (73 ph/keV conversion efficiency, 25 ns decay time) coupled to 144 NUV-HD silicon photomultipliers (SiPMs). The detector shows state-of-the-art energy resolution along the entire range thanks to the automatic gain switching feature [adaptive gain control (AGC)] of the custom application-specific integrated circuits (ASICs) employed in the system. To the best of our knowledge, this is the first time that SiPMs have been used to measure such high energy together with a wide dynamic range and excellent energy resolution (2.7% at 662 keV). In addition, the pixelated nature of the SiPMs detectors, combined with machine learning (ML) algorithms, can be exploited to reconstruct the position of the first interaction of the gamma rays inside the scintillation crystal. Previous measurements with a 137Cs collimated source have achieved a spatial resolution better than 2 cm. This performance in position sensitivity has been used to compensate for the relativistic Doppler broadening effects of gamma rays at 15.110(3) MeV emitted by a carbon nucleus moving at relativistic speed (v/c $\simeq ~0.05$ ) resulting from a boron-on-deuterium reaction, improving the FWHM resolution of the peak by 15%, which is in agreement with the theoretical expectation.

Published
2023
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6. Gamma spectroscopy of even even Ytterbium isotopes.pdf

Author

Efstathiou, Margarita, Karadimas, Angelos, Zyriliou, Aikaterini, Vasileiou, Polytimos, Mertzimekis, Theo J., Khaliel, Ahmed, Pelonis, Stefanos, Stan, Lucian, Turturica, Andrei, Costache, Christian, Radu, Mihai, Borcea, Ruxandra, Ujeniuc, Sorin, Toma, Sebastian, Clisu, Christina, Oprea, Andreea, Ionescu, Alina, Gheorghe, Ioana, Boromizav, M., Mihai, Constantin, Nita, Cristina, Marginean, Nicolae, Marginean, R., Florea, N., Dinescu, Irina, Bucurescu, D., Filipescu, Dan, Lica, R., Stroe, L., and Suvaila, R.

Abstract

30th Symposium of the Hellenic Nuclear Physics Society (HNPS-2022), 7-8 October 2022, Ioannina, Greece

Published
2022
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7. High precision measurement of the Ne-19 beta-decay half-life using real-time digital acquisition

Author

Fontbonne, C., Ujić, Predrag, de Oliveira Santos, F., Flechard, Xavier, Rotaru, Florin, Achouri, Lynda N., Girard Alcindor, V., Bastin, Beyhan, Boulay, Francois, Briand, J. B., Sanchez-Benitez, Angel Miguel, Bouzomita, H., Borcea, Catalin, Borcea, Ruxandra, Blank, Bertram B., Carniol, Benjamin, Čeliković, Igor T., Delahaye, Pierre, Delaunay, F., Etasse, David, Fremont, Georges, de France, Gilles, Fontbonne, Jean Marc, Grinyer, G. F., Harang, J., Hommet, Jean, Jevremović, Aleksandar M., Lewitowicz, Marek, Martel, Ismael, Mrazek, Jaromir, Parlog, Marian, Poincheval, J., Ramos, Diego, Spitaels, C., Stanoiu, Mihai, Thomas, Jean-Charles, and Toprek, Dragan

Abstract

The half-life of Ne-19 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 +/- 0.0019((stat)) +/- 0.0009((syst)) s, is the most precise up to now for Ne-19. 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

9. An above-barrier narrow resonance in F-15

Author

de Grancey, F., Mercenne, Alexis, Santos, F. de Oliveira, Davinson, Thomas, Sorlin, Olivier, Angelique, Jean-Claude, Assie, Marlène, Berthoumieux, Eric, Borcea, Ruxandra, Buta, Anna, Čeliković, Igor T., Chudoba, V., Daugas, Jean Michel, Dumitru, G., Fadil, Manssour, Grèvy, Stéphane, Kiener, Jürgen K., Lefebvre-Schuhl, A., Michel, Nicolas, Mrazek, Jaromir, Negoita, Florin, Okolowicz, Jacek, Pantelica, Dan, Pellegriti, Maria Grazia, Perrot, L., Ploszajczak, M., Randisi, G., Ray, I., Roig, O., Rotaru, F., Saint Laurent, M. G., Smirnova, N., Stanoiu, M., Stefan, I., Stodel, C., Subotić, Krunoslav M., Tatischeff, V., Thomas, J. C., Ujić, Predrag, Wolski, R., de Grancey, F., Mercenne, Alexis, Santos, F. de Oliveira, Davinson, Thomas, Sorlin, Olivier, Angelique, Jean-Claude, Assie, Marlène, Berthoumieux, Eric, Borcea, Ruxandra, Buta, Anna, Čeliković, Igor T., Chudoba, V., Daugas, Jean Michel, Dumitru, G., Fadil, Manssour, Grèvy, Stéphane, Kiener, Jürgen K., Lefebvre-Schuhl, A., Michel, Nicolas, Mrazek, Jaromir, Negoita, Florin, Okolowicz, Jacek, Pantelica, Dan, Pellegriti, Maria Grazia, Perrot, L., Ploszajczak, M., Randisi, G., Ray, I., Roig, O., Rotaru, F., Saint Laurent, M. G., Smirnova, N., Stanoiu, M., Stefan, I., Stodel, C., Subotić, Krunoslav M., Tatischeff, V., Thomas, J. C., Ujić, Predrag, and Wolski, R.

Abstract

Intense and purified radioactive beam of post-accelerated O-14 was used to study the low-lying states in the unbound F-15 nucleus. Exploiting resonant elastic scattering in inverse kinematics with a thick target, the second excited state, a resonance at E-R = 4.757(6)(10) MeV with a width of Gamma = 36(5)(14) keV was measured for the first time with high precision. The structure of this narrow above-barrier state in a nucleus located two neutrons beyond the proton drip line was investigated using the Gamow Shell Model in the coupled channel representation with a C-12 core and three valence protons. It is found that it is an almost pure wave function of two quasi-bound protons in the 2s(1/2) shell. (C) 2016 The Authors. Published by Elsevier B.V.

Published
2016

10. Spectroscopy of Na-18: Bridging the two-proton radioactivity of Mg-19

Author

Assie, Marlène, Santos, F. de Oliveira, Davinson, Thomas, de Grancey, F., Achouri, Lynda N., Alcantara-Nunez, J., Al Kalanee, T., Angelique, J-C, Borcea, Catalin, Borcea, Ruxandra, Caceres, L., Čeliković, Igor T., Chudoba, V., Pang, D. Y., Ducoin, C., Fallot, M., Kamalou, O., Kiener, Jürgen K., Lam, Y., Lefebvre-Schuhl, A., Lotay, G., Mrazek, Jaromir, Perrot, L., Sanchez-Benitez, Angel Miguel, Rotaru, Florin, Saint-Laurent, M-G, Sobolev, Yu, Smirnova, N., Stanoiu, Mihai, Stefan, I., Subotić, Krunoslav M., Ujić, Predrag, Wolski, R., and Woods, P. J.

Subjects
Ne-17, Physics::Accelerator Physics, (19)mg, Two-proton radioactivity, Nuclear Experiment, Resonant elastic scattering, Na-18
Abstract

The unbound nucleus Na-18, the intermediate nucleus in the two-proton radioactivity of Mg-19, was studied by the measurement of the resonant elastic scattering reaction H(Ne-17,p)Ne-17 performed at 4 A.MeV using a radioactive beam from the SPIRAL Facility. Spectroscopic properties of the low-lying states were obtained in an R-matrix analysis of the excitation function. (C) 2012 Elsevier B.V. All rights reserved. Preprint available at: [https://arxiv.org/pdf/1110.1236.pdf]

Published
2012

11. Search for Superscreening Effects in a Superconductor

Author

Ujić, Predrag, Santos, F. de Oliveira, Lewitowicz, Marek, Achouri, Lynda N., Assie, Marlène, Bastin, B., Borcea, C., Borcea, Ruxandra, Buta, Anna, Coc, A., de France, Gilles, Kamalou, O., Kiener, Jürgen K., Lepailleur, A., Meot, V., Pautrat, A., Saint Laurent, M. G., Sorlin, Olivier, Stanoiu, M., Tatischeff, V., Ujić, Predrag, Santos, F. de Oliveira, Lewitowicz, Marek, Achouri, Lynda N., Assie, Marlène, Bastin, B., Borcea, C., Borcea, Ruxandra, Buta, Anna, Coc, A., de France, Gilles, Kamalou, O., Kiener, Jürgen K., Lepailleur, A., Meot, V., Pautrat, A., Saint Laurent, M. G., Sorlin, Olivier, Stanoiu, M., and Tatischeff, V.

Abstract

The decay of O-19(beta(-)) and Ne-19(beta(+)) implanted in niobium in its superconducting and metallic phases was measured using purified radioactive beams produced by the SPIRAL GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within a 1 sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in a superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for Ne-19 and 400(320) eV for O-19. Precise determinations of the half-lives were obtained for O-19, 26.476(9) s, and for Ne-19, 17.254(5) s.

Published
2013

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