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213 results on '"Stefanini C."'

1. 7Be and 8B reaction dynamics at Coulomb barrier energies

Author

Strano E., Mazzocco M., Boiano A., Boiano C., La Commara M., Manea C., Parascandolo C., Pierroutsakou D., Signorini C., Torresi D., Yamaguchi H., Kahl D., Acosta L., Di Meo P., Fernandez-Garcia J.P., Glodariu T., Grebosz J., Guglielmetti A., Imai N., Hirayama Y., Ishiyama H., Iwasa N., Jeong S.C., Jia H.M., Keeley N., Kim Y.H., Kimura S., Kubono S., Lay J.A., Lin C.J., Marquinez-Duran G., Marte I., Miyatake H., Mukai M., Nakao T., Nicoletto M., Pakou A., Rusek K., Sakaguchi Y., Sanchez-Benitez A.M., Sava T., Sgouros O., Stefanini C., Soramel F., Soukeras V., Stiliaris E., Stroe L., Teranishi T., Toniolo N., Wakabayashi Y., Watanabe Y.X., Yang L., and Yang Y.Y.

Subjects
Physics, QC1-999
Abstract

We investigated the reaction dynamics induced by the 7Be,8B+208Pb collisions at energies around the Coulomb barrier. Charged particles originated by both the col- lisions were detected by means of 6 ΔE-Eres telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the 6,7Li+208Pb colli-sion data. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.

Published
2018
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2. Sub-barrier fusion of Si+Si systems

Author

Colucci G., Montagnoli G., Stefanini A. M., Bourgin D., Čolović P., Corradi L., Courtin S., Faggian M., Fioretto E., Galtarossa F., Goasduff A., Haas F., Mazzocco M., Scarlassara F., Stefanini C., Strano E., Urbani M., Szilner S., and Zhang G. L.

Subjects
Physics, QC1-999
Abstract

The near- and sub-barrier fusion excitation function has been measured for the system 30Si+30Si at the Laboratori Nazionali di Legnaro of INFN, using the 30Si beam of the XTU Tandem accelerator in the energy range 47 - 90 MeV. A set-up based on a beam electrostatic deflector was used for detecting fusion evaporation residues. The measured cross sections have been compared to previous data on 28Si+28Si and Coupled Channels (CC) calculations have been performed using M3Y+repulsion and Woods-Saxon potentials, where the lowlying 2+ and 3− excitations have been included. A weak imaginary potential was found to be necessary to reproduce the low energy 28Si+28Si data. This probably simulates the effect of the oblate deformation of this nucleus. On the contrary, 30Si is a spherical nucleus, 30Si+30Si is nicely fit by CC calculations and no imaginary potential is needed. For this system, no maximum shows up for the astrophysical S-factor so that we have no evidence for hindrance, as confirmed by the comparison with CC calculations. The logarithmic derivative of the two symmetric systems highlights their different low energy trend. A difference can also be noted in the two barrier distributions, where the high-energy peak present in 28Si+28Si is not observed for 30Si+30Si, probably due to the weaker couplings in last case.

Published
2017
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3. 7Be- and 8B-reaction dynamics at Coulomb barrier energies

Author

Mazzocco M., Boiano A., Boiano C., La Commara M., Manea C., Parascandolo C., Pierroutsakou D., Signorini C., Strano E., Torresi D., Yamaguchi H., Kahl D., Acosta L., Di Meo P., Fernandez-Garcia J.P., Glodariu T., Grebosz J., Guglielmetti A., Imai N., Hirayama Y., Ishiyama H., Iwasa N., Jeong S.C., Jia H.M., Keeley N., Kim Y.H., Kimura S., Kubono S., Lay J.A., Lin C.J., Marquinez-Duran G., Martel I., Miyatake H., Mukai M., Nakao T., Nicoletto M., Pakou A., Rusek K., Sakaguchi Y., Sánchez-Benítez A.M., Sava T., Sgouros O., Stefanini C., Soramel F., Soukeras V., Stiliaris E., Stroe L., Teranishi T., Toniolo N., Wakabayashi Y., Watanabe Y.X., Yang L., and Yang Y.Y.

Subjects
Physics, QC1-999
Abstract

We investigated the reaction dynamics induced by the Radioactive Ion Beams 7Be and 8B on a 208Pb target at energies around the Coulomb barrier. The two measurements are strongly interconnected, being 7Be (Sα = 1.586 MeV) the loosely bound core of the even more exotic 8B (Sp = 0.1375 MeV) nucleus. Here we summarize the present status of the data analysis for the measurement of the elastic scattering process for both reactions and the preliminary results for the optical model analysis of the collected data.

Published
2016
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18. Evidence for O-15 + alpha resonance structures in Ne-19 via direct measurement

Author

Torresi, D., Wheldon, C., Kokalova, T.z., Bailey, S., Boiano, A., Boiano, C., Fisichella, M., Mazzocco, M., Parascandolo, C., Pierroutsakou, D., Strano, E., Zadro, M., Cavallaro, M., Cherubini, S., Curtis, N., Di Pietro, A., Fernández Garcia, J. P., Figuera, P., Glodariu, T., Grbosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mengoni, D., Pizzone, R. G., Signorini, C., Stefanini, C., Stroe, L., Spitaleri, C., Torresi, D., Wheldon, C., Kokalova, T. z., Bailey, S., Boiano, A., Boiano, C., Fisichella, M., Mazzocco, M., Parascandolo, C., Pierroutsakou, D., Strano, E., Zadro, M., Cavallaro, M., Cherubini, S., Curtis, N., Di Pietro, A., Fernández Garcia, J. P., Figuera, P., Glodariu, T., Grbosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mengoni, D., Pizzone, R. G., Signorini, C., Stefanini, C., Stroe, L., and Spitaleri, C.

Subjects
Nuclear and High Energy Physics
Abstract

States in the astrophysically important Ne-19 nucleus have been populated directly using the O-15(alpha, alpha) O-15 reaction with a radioactive O-15 beam. Due to the challenges involved, this represents the first such O-15 measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the O-15 radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in He-4 to reduce systematic uncertainties. The results show evidence for O-15 + alpha cluster structure which could explain earlier results pointing to the increased alpha branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

Published
2017

19. Oxygen-15+alpha resonant elastic scattering to study cluster states in Ne-19

Author

Torresi, D., Wheldon, C., Kokalova, T.z., Bailey, S., Boiano, A., Boiano, C., Cavallaro, M., Cherubini, S., Di Pietro, A., Fernandez Garcia, J. P., Fisichella, M., Glodariu, T. R., Grebosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mazzocco, M., Mengoni, D., Parascandolo, C., Pierroutsakou, D., Pizzone, G., Signorini, C., Stefanini, C., Stroe, L., Spitaleri, C., Strano, E., Zadro, M., Torresi, D., Wheldon, C., Kokalova, T. z., Bailey, S., Boiano, A., Boiano, C., Cavallaro, M., Cherubini, S., Di Pietro, A., Fernandez Garcia, J. P., Fisichella, M., Glodariu, T. R., Grebosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mazzocco, M., Mengoni, D., Parascandolo, C., Pierroutsakou, D., Pizzone, G., Signorini, C., Stefanini, C., Stroe, L., Spitaleri, C., Strano, E., and Zadro, M.

Subjects
Physics and Astronomy (all)
Abstract

The elastic scattering excitation function for O-15 on He-4 was measured - for the first time - by using the Inverse Kinematic Thick Target scattering method. The obtained spectrum was analysed in an R-matrix framework providing spectroscopic information for several states in the excitation energy of the nucleus Ne-19 from 4.8 to 9 MeV. Eight of them are newly observed states. The set-up and the experimental technique will be described in detail and the results will be shown and discussed.

Published
2017

20. Be-7 and B-8 reaction dynamics at Coulomb barrier energies

Author

Strano, E. Mazzocco, M. Boiano, A. Boiano, C. La Commara, M. Manea, C. Parascandolo, C. Pierroutsakou, D. and Signorini, C. Torresi, D. Yamaguchi, H. Kahl, D. Acosta, L. Di Meo, P. Fernandez-Garcia, J. P. Glodariu, T. and Grebosz, J. Guglielmetti, A. Imai, N. Hirayama, Y. and Ishiyama, H. Iwasa, N. Jeong, S. C. Jia, H. M. Keeley, N. Kim, Y. H. Kimura, S. Kubono, S. Lay, J. A. Lin, C. J. Marquinez-Duran, G. Martel, I. Miyatake, H. Mukai, M. Nakao, T. Nicoletto, M. Pakou, A. Rusek, K. and Sakaguchi, Y. Sanchez-Benitez, A. M. Sava, T. Sgouros, O. and Stefanini, C. Soramel, F. Soukeras, V. Stiliaris, E. and Stroe, L. Teranishi, T. Toniolo, N. Wakabayashi, Y. and Watanabe, Y. X. Yang, L. Yang, Y. Y.

Abstract

We investigated the reaction dynamics induced by the Be-7, B-8+Pb-208 collisions at energies around the Coulomb barrier. Charged particles originated by both the collisions were detected by means of 6 Delta E-E-res telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the Li-6,Li-7+Pb-208 collision data. According to the preliminary results, Be-7 nucleus reactivity is rather similar to the Li-7 one whereas the B-8+Pb-208 total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.

Published
2018

23. α and He 3 production in the Be 7 + Si 28 reaction at near-barrier energies: Direct versus compound-nucleus mechanisms

Author

Sgouros, O., Pakou, A, Pierroutsakou, D., Mazzocco, Marco, Acosta, L., Aslanoglou, X., Betsou, C. h., Boiano, A., Boiano, C., Carbone, D., Cavallaro, M., Grebosz, J., Keeley, N., La Commara, M., Manea, C., Marquinez Duran, G., Martel, I., Nicolis, N. G., Parascandolo, Concetta, Rusek, K., Sánchez Benítez, A. M., Signorini, Cosimo, Soramel, Francesca, Soukeras, V., Stefanini, C., Stiliaris, E., Strano, Emanuele, Strojek, I., Torresi, DOMENICO MARIO, Sgouros, O., Pakou, A, Pierroutsakou, D., Mazzocco, M., Acosta, L., Aslanoglou, X., Betsou, C. h., Boiano, A., Boiano, C., Carbone, D., Cavallaro, M., Grebosz, J., Keeley, N., LA COMMARA, Marco, Manea, C., Marquinez Duran, G., Martel, I., Nicolis, N. G., Parascandolo, C., Rusek, K., Sánchez Benítez, A. M., Signorini, C., Soramel, F., Soukeras, V., Stefanini, C., Stiliaris, E., Strano, E., Strojek, I., and Torresi, D.

Subjects
Nuclear and High Energy Physics
Published
2016

24. Elastic scattering of Be 7 + Si 28 at near-barrier energies

Author

Sgouros, O. Pakou, A. Pierroutsakou, D. Mazzocco, M. Acosta, L. Aslanoglou, X. Betsou, C. Boiano, A. Boiano, C. Carbone, D. Cavallaro, M. Grebosz, J. Keeley, N. La Commara, M. Manea, C. Marquínez-Durán, G. Martel, I. Nicolis, N.G. Parascandolo, C. Rusek, K. Sánchez-Benítez, A.M. Signorini, C. Soramel, F. Soukeras, V. Stefanini, C. Stiliaris, E. Strano, E. Strojek, I. Torresi, D.

Abstract

The elastic scattering of the radioactive nucleus Be7 from a Si28 target was studied at four near-barrier energies: 13.2, 17.2, 19.8, and 22.0 MeV (E/VC=1.14, 1.48, 1.71, and 1.90). Angular distribution measurements were performed at each energy with the multidetector array EXPADES in conjunction with two Parallel-Plate Avalanche Counters (PPAC) to enable beam ray reconstruction of the events. The data are analyzed in a double-folding framework and the energy evolution of the optical potential as well as the total reaction cross sections are deduced and discussed. © 2017 American Physical Society.

Published
2017

25. Evidence for O 15 +α resonance structures in Ne 19 via direct measurement

Author

Torresi, D., Wheldon, C., Kokalova, T. z., Bailey, S., Boiano, A., Boiano, C., Fisichella, M., Mazzocco, M., Parascandolo, C., Pierroutsakou, D., Strano, E., Zadro, M., Cavallaro, M., Cherubini, S., Curtis, N., Di Pietro, A., Fernández Garcia, J. P., Figuera, P., Glodariu, T., Grbosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mengoni, D., Pizzone, R. G., Signorini, C., Stefanini, C., Stroe, L., and Spitaleri, C.

Subjects
Nuclear and High Energy Physics
Published
2017

26. Evidence for 15O+α resonance structures in 19Ne via direct measurement

Author

Torresi, D., Wheldon, C., Kokalova, Tz., Bailey, S., Boiano, A., Boiano, C., Fisichella, M., Mazzocco, M., Parascandolo, C., Pierroutsakou, D., Strano, E., Zadro, Mile, Cavallaro, M., Cherubini, S., Curtis, N., Di Pietro, A., Garcia Fernandez J.P., Figuera, P., Glodariu, T., Grebosz, J., La Cognata, M., La Commara, M., Lattuada, M., Mengoni, D., Pizzone, R.G., Signorini, C., Stefanini, C., Stroe, L., and Spitaleri, C.

Subjects
15O, readiactive beam, resonant scattering, 19Ne, cluster structure
Abstract

States in the astrophysically important 19Ne nucleus have been populated directly using the 15O(α, α)15O reaction with a radioactive 15O beam. Due to the challenges involved, this represents the first such 15O measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the 15O radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in 4He to reduce systematic uncertainties. The results show evidence for 15O+α cluster structure which could explain earlier results pointing to the increased α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

Published
2017

27. Be-7- and B-8-reaction dynamics at Coulomb barrier energies

Author

Mazzocco, M. Boiano, A. Boiano, C. La Commara, M. Manea, C. Parascandolo, C. Pierroutsakou, D. Signorini, C. and Strano, E. Torresi, D. Yamaguchi, H. Kahl, D. Acosta, L. and Di Meo, P. Fernandez-Garcia, J. P. Glodariu, T. Grebosz, J. Guglielmetti, A. Imai, N. Hirayama, Y. Ishiyama, H. and Iwasa, N. Jeong, S. C. Jia, H. M. Keeley, N. Kim, Y. H. Kimura, S. Kubono, S. Lay, J. A. Lin, C. J. and Marquinez-Duran, G. Martel, I. Miyatake, H. Mukai, M. and Nakao, T. Nicoletto, M. Pakou, A. Rusek, K. Sakaguchi, Y. Sanchez-Benitez, A. M. Sava, T. Sgouros, O. and Stefanini, C. Soramel, F. Soukeras, V. Stiliaris, E. and Stroe, L. Teranishi, T. Toniolo, N. Wakabayashi, Y. and Watanabe, Y. X. Yang, L. Yang, Y. Y.

Abstract

We investigated the reaction dynamics induced by the Radioactive Ion Beams Be-7 and B-8 on a Pb-208 target at energies around the Coulomb barrier. The two measurements are strongly interconnected, being Be-7 (S-alpha = 1.586 MeV) the loosely bound core of the even more exotic B-8 (S-p = 0.1375 MeV) nucleus. Here we summarize the present status of the data analysis for the measurement of the elastic scattering process for both reactions and the preliminary results for the optical model analysis of the collected data.

Published
2016

28. α and He 3 production in the Be 7 + Si 28 reaction at near-barrier energies: Direct versus compound-nucleus mechanisms

Author

Sgouros, O. Pakou, A. Pierroutsakou, D. Mazzocco, M. Acosta, L. Aslanoglou, X. Betsou, Ch. Boiano, A. Boiano, C. Carbone, D. Cavallaro, M. Grebosz, J. Keeley, N. La Commara, M. Manea, C. Marquinez-Duran, G. Martel, I. Nicolis, N.G. Parascandolo, C. Rusek, K. Sánchez-Benítez, A.M. Signorini, C. Soramel, F. Soukeras, V. Stefanini, C. Stiliaris, E. Strano, E. Strojek, I. Torresi, D.

Abstract

The production of α and He3 particles, the cluster constituents of Be7, in the Be7+Si28 reaction was studied at three near-barrier energies, namely 13, 20, and 22 MeV. Angular distribution measurements were performed at each energy, and the data were analyzed in both statistical model and Distorted-Wave Born Approximation (DWBA) frameworks in order to disentangle the degree of competition between direct and compound channels. The energy evolution of the ratio of direct to total reaction cross section was mapped in comparison with similar data for Li6 and Li7 projectiles on a Si28 target. The results indicate larger transfer contributions for collisions involving the mirror nuclei Be7 and Li7 than in the Li6 case. Fusion cross sections were deduced, taking into account the α-particle cross sections due to compound-nucleus formation and particle multiplicities deduced from our statistical model framework. It was found that fusion is compatible with systematics and single-barrier penetration cross sections to within an uncertainty band of 10% to 20%. Indications of fusion hindrance for Li7 and Be7 compared to Li6, starting from the barrier and below it, are given. This hindrance is attributed to the existence of large transfer channels. Furthermore, the experimental results, analyzed in the DWBA framework, suggest He3 and He4 transfer as the dominant direct reaction mechanism. © 2016 American Physical Society.

Published
2016

30. Reaction Dynamics Induced By The Radioactive Ion Beam Be-7 on Medium-Mass and Heavy Targets

Author

Mazzocco, M. Boiano, A. Boiano, C. La Commara, M. Manea, C. Parascandolo, C. Pierroutsakou, D. Stefanini, C. and Strano, E. Torresi, D. Acosta, L. Di Meo, P. and Fernandez-Garcia, J. P. Glodariu, T. Grebosz, J. and Guglielmetti, A. Keeley, N. Lay, J. A. Marquinez-Duran, G. and Martel, I. Mazzocchi, C. Molini, P. Nicoletto, M. and Pakou, A. Parkar, V. V. Rusek, K. Sanchez-Benitez, A. M. and Sandoli, M. Sava, T. Sgouros, O. Signorini, C. and Silvestri, R. Soramel, F. Soukeras, V. Stiliaris, E. and Stroe, L. Toniolo, N. Zerva, K.

Subjects
Physics::Accelerator Physics, Nuclear Experiment
Abstract

We studied the reaction dynamics induced at Coulomb barrier energies by the weakly-bound Radioactive Ion Beam Be-7 (S-alpha = 1.586 MeV) on medium-mass (Ni-58) and heavy (Pb-208) targets. The experiments were performed at INFN-LNL (Italy), where a 2-3x10(5) pps Be-7 secondary beam was produced with the RIB in-flight facility EXOTIC. Charged reaction products were detected by means of high-granularity silicon detectors in rather wide angular ranges. The contribution presents an up-to-date status of the data analysis and theoretical interpretation for both systems.

Published
2015

35. Preformed homologous cortical bone prostheses for ossiculoplasty: Preliminary clinical results in eighteen patients

Author

Berrettini, S, Danti, S, De Vito, A, D’Alessandro, D, Forli, F, Mancini, I, Stefanini, C, and Bruschini, L

Subjects
Adult, Bioprosthesis, Male, Cholesteatoma, Middle Ear, Tympanic Membrane Perforation, Middle Aged, Prosthesis Design, Otitis Media, Suppurative, Ossicular Prosthesis, Otitis Media, Postoperative Complications, Prosthesis Fitting, Audiometry, Pure-Tone, Humans, Female, Bone Banks, Bone Conduction, Aged, Follow-Up Studies
Published
2012

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