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17 results on '"Farnea, Enrico"'

1. Spectroscopic studies of isospin mixing in 64Ge

Author

Farnea, Enrico

Subjects
539.7, GERMANIUM 64, ISOSPIN, SPIN EXCHANGE, MIXING, SPECTROSCOPY
Abstract

The high-spin states of the nucleus 64Ge have been investigated using the GASP and the EUROBALL arrays of high-purity germanium detectors. In order to achieve the required experimental sensitivity, special selecting devices were used, namely a highly efficient array of liquid scintillators to detect neutrons and the ISIS Si-ball to detect light charged particles, which has been developed in the present work. A detailed decay scheme for 64Ge has been deduced, assigning spins and parities to the levels through a Directional Correlation from Oriented states analysis, an Angular Distribution analysis and a Polarization Correlation from Oriented states analysis. The character of an intense 1665 keV transition, previously reported as a stretched electric dipole with a small multipole mixing ratio, has been established as an electric dipole with a large multipole mixing ratio. The electric dipole strength has been measured using EUROBALL coupled to an early implementation of the EUCLIDES Si-ball and with the Koln plunger device, allowing an experimental estimate of the isospin mixing probability in 64Ge.

Published
2001

2. Transition probabilities in neutron-rich 80,82Se and the role of the {\nu}g9/2 orbital

Author

Litzinger, J, Blazhev, Andrey, Dewald, Alfred, Didierjean, Francois, Duchene, G, Fransen, C., Lozeva, R, Verney, D, De Angelis, G., Bazzacco, Dino, Birkenbach, B., Bottoni, S., Bracco, Angela, Braunroth, T, Cederwall, B., Corradi, Lorenzo, Crespi, F.C.L., Désesquelles, Pierre, Eberth, Jürgen, Ellinger, E., Farnea, Enrico, Fioretto, E., Gernhauser, Roman, Goasduff, A, Görgen, Andreas, Gottardo, Andrea, Grebosz, J, Hackstein, Matthias, Hess, Herbert, Ibrahim, Fadi, Jolie, J, Jungclaus, Andrea, Kolos, K, Korten, Wolfram, Leoni, Silvia, Lunardi, Santo, Maj, Adam, Menegazzo, R., Mengoni, Daniele, Michelagnoli, Caterina, Mijatovic, T., Million, Bénédicte, Möller, O, Modamio, Victor, Montagnoli, G., Montanari, D., Morales, Ana Isabel, Napoli, D.R., Niikura, Megumi, Pietralla, Norbert A., Pollarolo, G., Pullia, A., Quintana, B., Recchia, Francesco, Reiter, Peter, Rosso, D., Sahin, Eda, Salsac, Marie Delphine, Scarlassara, F., Söderström, Pär Anders, Stefanini, AM, Stezowski, Olivier, Szilner, Suzana, Theisen, Christophe, Valiente-Dobón, Jose Javier, Vandone, V, and Vogt, A.

Abstract

Transition probabilities of intermediate-spin yrast and non-yrast excitations in 80,82Se were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the γ -ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In 80Se, the level lifetimes of the yrast (6+ 1 ) and (8+ 1 ) states and of a non-yrast band feeding the yrast 4+ 1 state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In 82Se, the level lifetimes of the yrast 6+ 1 state and the yrare 4+ 2 state and lifetime limits of the yrast (10+ 1 ) state and of the 5− 1 state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states’ wave functions are investigated and discussed with respect to the role of the neutron g9/2 orbital.

Published
2018

3. Quadrupole collectivity in 42Ca from low-energy Coulomb excitation with AGATA

Author

Hadynska-Klek, Katarzyna, Napiorkowski, Paweł Jan, Zielinska, Magdalena, Srebrny, Julian, Maj, Adam, Azaiez, Faisal, Valiente-Dobón, Jose Javier, Kicinska-Habior, M, Nowacki, Frédéric, Naïdja, Houda, Bounthong, B, Rodriguez, T.R., De Angelis, G., Abraham, T., Anil Kumar, G, Bazzacco, Dino, Bellato, Marco, Bortolato, D., Bednarczyk, P., Benzoni, Giovanna, Berti, L, Birkenbach, Benedikt, Bruyneel, B., Brambilla, S., Camera, Franco, Chavas, J, Cederwall, B., Charles, L., Ciemala, M., Cocconi, P, Coleman-Smith, P, Colombo, A, Corsi, A., Crespi, F.C.L., Cullen, Dave M., Czermak, A, Désesquelles, Pierre, Doherty, Daniel T., Dulny, B, Eberth, Jürgen, Farnea, Enrico, Fornal, B., Franchoo, Serge, Gadea, Andrés, Giaz, Agnese, Gottardo, Andrea, Grave, X, Grebosz, J., Görgen, Andreas, Gulmini, M, Habermann, T, Hess, Herbert, Isocrate, R., Iwanicki, J., Jaworski, G, Judson, DS, Jungclaus, Andrea, Karkour, N., Kmiecik, M., Karpinski, D, Kisielinski, M, Kondratyev, N, Korichi, Amel, Komorowska, M, Kowalczyk, M., Korten, Wolfram, Krzysiek, M, Lehaut, G, Leoni, Silvia, Ljungvall, Joa, Lopez-Martens, Araceli, Lunardi, Santo, Maron, G., Mazurek, K., Menegazzo, Roberto, Mengoni, Daniele, Merchan, E., Meczynski, W., Michelagnoli, Caterina, Milion, B, Myalski, S., Napoli, D.R., Niikura, Megumi, Obertelli, Alexandre, Ozmen, SF, Palacz, M, Prochniak, L., Pullia, A., Quintana, B., Rampazzo, G, Recchia, F., Redon, N, Reiter, Peter, Rosso, D., Rusek, K, Sahin, Eda, Salsac, Marie Delphine, Söderström, Pär Anders, Stefan, I., Stezowski, Olivier, Styczen, J, Theisen, Christophe, Toniolo, N, Ur, Cǎlin A., Wadsworth, R, Wasilewska, B., Wiens, Andreas, Wood, J.L., Wrzosek-Lipska, Katarzyna, and Ziblinski, M.

Abstract

A Coulomb-excitation experiment to study electromagnetic properties of 42Ca was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. γ rays from excited states in 42Ca were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in 42Ca, including the diagonal E2 matrix elements of 2+ 1 and 2+ 2 states, were determined using the least-squares code GOSIA. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 0+ 1,2 and 2+ 1,2 states, as well as triaxiality for 0+ 1,2 states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in 42Ca. The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in 42Ca.

Published
2018

4. First in-beam γ -ray study of the level structure of neutron-rich S 39

Author

Chapman, R., Wang, Z. M., Bouhelal, M., Haas, F., Liang, X., Azaiez, F., Behera, B. R., Burns, M., Caurier, E., Corradi, L., Curien, D., Deacon, A. N., Dombrádi, Z. s., Farnea, Enrico, Fioretto, E., Gadea, A., Hodsdon, A., Ibrahim, F., Jungclaus, A., Keyes, K., Kumar, V., Lunardi, S., Mǎrginean, N., Montagnoli, Giovanna, Napoli, D. R., Nowacki, F., Ollier, J., O'Donnell, D., Papenberg, A., Pollarolo, Giovanni, Salsac, M. D., Scarlassara, Fernando, Smith, J. F., Spohr, K. M., Stanoiu, M., Stefanini, A. M., Szilner, Suzana, Trotta, Marta, and Verney, David

Subjects
Nuclear and High Energy Physics
Abstract

The neutron-rich S39 nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 target. The magnetic spectrometer, PRISMA, and the γ-ray array, CLARA, were used in the measurements. Gamma-ray transitions of the following energies were observed: 339, 398, 466, 705, 1517, 1656, and 1724 keV. Five of the observed transitions have been tentatively assigned to the decay of excited states with spins up to (11/2-). The results of a state-of-the-art shell-model calculation of the level scheme of S39 using the SDPF-U effective interaction are also presented. The systematic behavior of the excitation energy of the first 11/2- states in the odd-A isotopes of sulfur and argon is discussed in relation to the excitation energy of the first excited 2+ states of the adjacent even-A isotopes. The states of S39 that have the components in their wave functions corresponding to three neutrons in the 1f7/2 orbital outside the N=20 core have also been discussed within the context of the 0 ω shell-model calculations presented here.

Published
2016
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5. Population of the 2ms+ mixed-symmetry state of Ba 140 with the α -transfer reaction

Author

Stahl, C., Leske, J., Bauer, C., Bazzacco, D., Farnea, Enrico, Gottardo, A., John, PHILIPP RUDOLF, Michelagnoli, Caterina, Pietralla, N., Reese, M., Şahin, E., Birkenbach, B., Bracco, A., Crespi, F. C. L., De Angelis, G., Désesquelles, P., Eberth, J., Gadea, A., Görgen, A., Grebosz, J., Hess, H., Jolie, J., Jungclaus, A., Korten, W., Lenzi, SILVIA MONICA, Lunardi, Santo, Menegazzo, R., Mengoni, Daniele, Modamio, V., Napoli, D. R., Pullia, A., Quintana, B., Recchia, Francesco, Reiter, P., Rosso, D., Salsac, M. D., Söderström, P. A., Stezowski, O., Theisen, C., Ur, CALIN ALEXANDRU, and VALIENTE DOBON, JOSE JAVIER

Published
2015

6. Multitude of 2+ discrete states in Sn 124 observed via the (O 17, O ′ 17 γ) reaction: Evidence for pygmy quadrupole states

Author

Pellegri, L., Bracco, A., Tsoneva, N., Avigo, R., Benzoni, G., Blasi, N., Bottoni, S., Camera, F., Ceruti, S., Crespi, F. C. L., Giaz, Agnese, Leoni, S., Lenske, H., Million, B., Morales, A. I., Nicolini, R., Wieland, O., Bazzacco, D., Bednarczyk, P., Birkenbach, B., Ciemała, M., De Angelis, G., Farnea, Enrico, Gadea, A., Görgen, A., Gottardo, A., Grebosz, J., Isocrate, R., Kmiecik, M., Krzysiek, M., Lunardi, Santo, Maj, A., Mazurek, K., Mengoni, Daniele, Michelagnoli, Caterina, Napoli, D. R., Recchia, Francesco, Siebeck, B., Siem, S., Ur, CALIN ALEXANDRU, and VALIENTE DOBON, JOSE JAVIER

Published
2015

7. Response of AGATA segmented HPGe detectors to gamma-rays up to 15.1 MeV

Author

Crespi, F. C. L, Avigo, R., Camera, Franco, Benzoni, G., Blasi, N., Bottoni, S., Bracco, Angela, Brambilla, S., Casati, P., Coniglio, F., Corsi, A., Giaz, Agnese, Leoni, Silvia, Million, B., Nicolini, R., Pellegri, L., Riboldi, S., Vandone, V., Wieland, O., Akkoyun, S., Atac, A., Bazzacco, D., Bellato, M., Bortolato, D., Calore, E., Ciemala, M., Farnea, Enrico, Gadea, A., Gottardo, Andrea, Kmiecik, M., Maj, A., Mengoni, Daniele, Michelagnoli, Caterina, Montanari, Daniele, Napoli, D. R., Nyberg, J., Recchia, Francesco, Sahin, E., Söderström, P. A., CALIN ALEXANDRU, Ur, and VALIENTE DOBON, JOSE JAVIER

Subjects
Nuclear and High Energy Physics, Radiation, Nuclear Medicine and Imaging, Radiology, Nuclear Medicine and Imaging, Radiology
Published
2012

8. Spectroscopy of odd-mass cobalt isotopes toward the N=40 subshell closure and shell-model description of spherical and deformed states

Author

Recchia, Francesco, Lenzi, Silvia M., Lunardi, Santo, Farnea, Enrico, Gadea, Andrés, Marginean, Nicolae Marius, Napoli D.R., Aydın, Sezgin, and Sabire Yazıcı Fen Edebiyat Fakültesi

Subjects
Nuclear Experiment
Abstract

The neutron-rich cobalt isotopes up to A=67 have been studied through multinucleon transfer reactions by bombarding a 238U target with a 460-MeV 70Zn beam. Unambiguous identification of prompt ? rays belonging to each nucleus has been achieved using coincidence relationships with the ions detected in a high-acceptance magnetic spectrometer. The new data are discussed in terms of the systematics of the cobalt isotopes and interpreted with large-scale shell-model calculations in the fpgd model space. In particular, very different shapes can be described in 67Co, at the edge of the island of inversion at N=40, where a low-lying highly deformed band coexists with a spherical structure. © 2012 American Physical Society.

Published
2012

9. Spectroscopy of odd-mass cobalt isotopes toward the N = 40 subshell closure and shell-model description of spherical and deformed states

Author

Recchia, Francesco, Lenzi, Silvia M., Lunardi, Santo, Farnea, Enrico, Gadea, Andrés, Mârginean, Nicolae Marius, Napoli, Daniel Ricardo, Aydın, Sezgin, and Sabire Yazıcı Fen Edebiyat Fakültesi

Abstract

Aydın, Sezgin (Aksaray, Yazar), The neutron-rich cobalt isotopes up to A=67 have been studied through multinucleon transfer reactions by bombarding a 238U target with a 460-MeV 70Zn beam. Unambiguous identification of prompt γ rays belonging to each nucleus has been achieved using coincidence relationships with the ions detected in a high-acceptance magnetic spectrometer. The new data are discussed in terms of the systematics of the cobalt isotopes and interpreted with large-scale shell-model calculations in the fpgd model space. In particular, very different shapes can be described in 67Co, at the edge of the island of inversion at N=40, where a low-lying highly deformed band coexists with a spherical structure.

Published
2012

10. Erratum: Lifetime measurements of the neutron-rich N=30 isotones Ca50 and Sc51: Orbital dependence of effective charges in the fp shell (Physical Review Letters (2009) 102 (242502))

Author

VALIENTE DOBON, JOSE JAVIER, Mengoni, Daniele, Gadea, A., Farnea, Enrico, Lenzi, SILVIA MONICA, Lunardi, Santo, Dewald, A., Pissulla, T. h., Szilner, Suzana, Broda, R., Recchia, Francesco, Algora, A., Angus, L., Bazzacco, D., Benzoni, G., Bizzeti, P. G., Bizzeti Sona, A. M., Boutachkov, P., Corradi, Laura, Crespi, F., De Angelis, G., Fioretto, E., Görgen, A., Gorska, M., Gottardo, Andrea, Grodner, E., Guiot, B., Howard, A., Królas, W., Leoni, Silvia, Mason, P., Menegazzo, R., Montanari, Daniele, Montagnoli, Giovanna, Napoli, D. R., Obertelli, A., Pawłat, T., Pollarolo, G., Rubio, B., Şahin, E., Scarlassara, Fernando, Silvestri, R., Stefanini, A. M., Smith, J. F., Steppenbeck, D., Ur, CALIN ALEXANDRU, Wady, P. T., Wrzesiński, J., Maglione, Enrico, and KURODA HAMAMOTO, Ikuko

Subjects
Physics and Astronomy (all)
Published
2009

11. Spectroscopy of Neutron-rich Nuclei in the A~60 Region

Author

Lunardi, Santo, Lenzi, SILVIA MONICA, DELLA VEDOVA, Francesca, Farnea, Enrico, Gadea, A, Marginean, N, Bazzacco, D, Beghini, S, Bracco, A, Benzoni, G, Bucurescu, D, Corradi, L, Deacon, A. N, ANGELIS G, De, Fioretto, E, Freeman, S. J, Guiot, B, Kay, B, IONESCU BUJOR, M, Iordachescu, A, Leoni, S, Mason, P, Menegazzo, R, Mengoni, Daniele, Million, B, Montagnoli, Giovanna, Napoli, D. R, Orlandi, R, Pollarolo, G, Recchia, Francesco, Scarlassara, Fernando, Silvestri, R, Smith, J. F, Stefanini, A. M, Steppenbeck, D, Szilner, Suzana, Ur, CALIN ALEXANDRU, VALIENTE DOBON, JOSE JAVIER, Varley, B. J, Wieland, O., and S.Harrisopoulos and R.Julin eds.

Subjects
Neutron-rich nuclei, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear Experiment
Abstract

Spectroscopy of Neutron-rich Nuclei in the A~60 Region

Published
2007

12. Spectroscopic studies of isospin mixing in 64 Ge

Author

Farnea, Enrico.

Abstract

The high-spin states of the nucleus 64Ge have been investigated using the GASP and the EUROBALL arrays of high-purity germanium detectors. In order to achieve the required experimental sensitivity, special selecting devices were used, namely a highly efficient array of liquid scintillators to detect neutrons and the ISIS Si-ball to detect light charged particles, which has been developed in the present work. A detailed decay scheme for 64Ge has been deduced, assigning spins and parities to the levels through a Directional Correlation from Oriented states analysis, an Angular Distribution analysis and a Polarization Correlation from Oriented states analysis. The character of an intense 1665 keV transition, previously reported as a stretched electric dipole with a small multipole mixing ratio, has been established as an electric dipole with a large multipole mixing ratio. The electric dipole strength has been measured using EUROBALL coupled to an early implementation of the EUCLIDES Si-ball and with the Koln plunger device, allowing an experimental estimate of the isospin mixing probability in 64Ge.

Published
2001

13. Interaction position resolution simulations and in-beam measurements of the AGATA HPGe detectors

Author

Söderström, Pär-Anders, Recchia, Francesco, Nyberg, Johan, Al-Adili, Ali, Ataç, Ayşe, Aydin, S., Bazzacco, Dino, Bednarczyk, P., Birkenbach, B., Bortolato, D., Boston, A. J., Boston, H. C., Bruyneel, B., Bucurescu, D., Calore, E., Colosimo, S., Crespi, F. C. L., Dosme, N., Eberth, J., Farnea, Enrico, Filmer, Fay, Gadea, Andres, Gottardo, Andrea, Grave, Xavier, Grebosz, J., Griffiths, R., Gulmini, M., Habermann, T., Hess, H., Jaworski, Grzegorz, Jones, P., Joshi, P., Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Legay, Eric, Lersch, D., Ljungvall, Joa, Lopez-Martens, A., Meczynski, W., Mengoni, D., Michelagnoli, C., Molini, P., Napoli, D. R., Orlandi, R., Pascovici, G., Pullia, A., Reiter, Peter, Sahin, Eda, Smith, J. F., Strachan, J., Tonev, D., Unsworth, Carl, Ur, C. A., Valiente-Dobón, Jose Javier, Veyssiere, C., Wiens, A., Söderström, Pär-Anders, Recchia, Francesco, Nyberg, Johan, Al-Adili, Ali, Ataç, Ayşe, Aydin, S., Bazzacco, Dino, Bednarczyk, P., Birkenbach, B., Bortolato, D., Boston, A. J., Boston, H. C., Bruyneel, B., Bucurescu, D., Calore, E., Colosimo, S., Crespi, F. C. L., Dosme, N., Eberth, J., Farnea, Enrico, Filmer, Fay, Gadea, Andres, Gottardo, Andrea, Grave, Xavier, Grebosz, J., Griffiths, R., Gulmini, M., Habermann, T., Hess, H., Jaworski, Grzegorz, Jones, P., Joshi, P., Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Legay, Eric, Lersch, D., Ljungvall, Joa, Lopez-Martens, A., Meczynski, W., Mengoni, D., Michelagnoli, C., Molini, P., Napoli, D. R., Orlandi, R., Pascovici, G., Pullia, A., Reiter, Peter, Sahin, Eda, Smith, J. F., Strachan, J., Tonev, D., Unsworth, Carl, Ur, C. A., Valiente-Dobón, Jose Javier, Veyssiere, C., and Wiens, A.

Abstract

The interaction position resolution of the segmented HPGe detectors of an AGATA triple cluster detector has been studied through Monte Carlo simulations and in an in-beam experiment. A new method based on measuring the energy resolution of Doppler-corrected γ-ray spectra at two different target to detector distances is described. This gives the two-dimensional position resolution in the plane perpendicular to the direction of the emitted γ-ray. The γ-ray tracking was used to determine the full energy of the γ-rays and the first interaction point, which is needed for the Doppler correction. Five different heavy-ion induced fusion-evaporation reactions and a reference reaction were selected for the simulations. The results of the simulations show that the method works very well and gives a systematic deviation of in the FWHM of the interaction position resolution for the γ-ray energy range from 60 keV to 5 MeV. The method was tested with real data from an in-beam measurement using a 30Si beam at 64 MeV on a thin 12C target. Pulse-shape analysis of the digitized detector waveforms and γ-ray tracking was performed to determine the position of the first interaction point, which was used for the Doppler corrections. Results of the dependency of the interaction position resolution on the γ-ray energy and on the energy, axial location and type of the first interaction point, are presented. The FWHM of the interaction position resolution varies roughly linearly as a function of γ-ray energy from 8.5 mm at 250 keV to 4 mm at 1.5 MeV, and has an approximately constant value of about 4 mm in the γ-ray energy range from 1.5 to 4 MeV.

Published
2011
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14. AGATA: Gamma-ray tracking in segmented HPGedetectors

Author

Söderström, Pär-Anders, Al-Adili, Ali, Nyberg, Johan, Recchia, Francesco, Farnea, Enrico, Gadea, Andres, Söderström, Pär-Anders, Al-Adili, Ali, Nyberg, Johan, Recchia, Francesco, Farnea, Enrico, and Gadea, Andres

Published
2009

15. First in-Beam Commissioning Experiment of AGATA

Author

Gadea, Andres, Nyberg, Johan, Recchia, Francesco, Söderström, Pär-Anders, Ataç, Ayşe, Aydin, S, Bazzacco, Dino, Bednarczyk, P, Bortolato, D, Boston, A. J., Boston, H. C., Bruyneel, B, Bucurescu, D, Calore, E, Colosimo, S, Crespi, F. C. L., Dosme, N, Farnea, Enrico, Filmer, Fay, Gottardo, Andrea, Gulmini, M, Jaworski, Grzegorz, Joshi, P, Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Mengoni, D, Michelagnoli, C, Molini, P, Napoli, D. R., Sahin, Eda, Smith, J. F., Tonev, D, Unsworth, Carl, Ur, C. A., Wiens, A, Gadea, Andres, Nyberg, Johan, Recchia, Francesco, Söderström, Pär-Anders, Ataç, Ayşe, Aydin, S, Bazzacco, Dino, Bednarczyk, P, Bortolato, D, Boston, A. J., Boston, H. C., Bruyneel, B, Bucurescu, D, Calore, E, Colosimo, S, Crespi, F. C. L., Dosme, N, Farnea, Enrico, Filmer, Fay, Gottardo, Andrea, Gulmini, M, Jaworski, Grzegorz, Joshi, P, Judson, D. S., Kempley, Ryan, Khaplanov, Anton, Mengoni, D, Michelagnoli, C, Molini, P, Napoli, D. R., Sahin, Eda, Smith, J. F., Tonev, D, Unsworth, Carl, Ur, C. A., and Wiens, A

Published
2009

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