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150 results on '"Szilner, S"'

3. Conceptual design of the AGATA 2[formula omitted] array at LNL

Author

Valiente-Dobón, J.J., Menegazzo, R., Goasduff, A., Agguiaro, D., Aguilera, P., Angelini, F., Balogh, M., Bazzacco, D., Benito, J., Benzoni, G., Bez, N., Bolognesi, M., Bottoni, S., Brugnara, D., Carollo, S., Cocconi, P., Cogo, A., Collado, J., Crespi, F.C.L., Ertoprak, A., Escudeiro, R., Galtarossa, F., Gamba, E.R., Gambalonga, A., Servín, B. Góngora, Gottardo, A., Gozzelino, A., Gulmini, M., Huang, Z., Marchi, T., Mengoni, D., Modanese, P., Napoli, D.R., Pellumaj, J., Pérez-Vidal, R.M., Pigliapoco, S., Pilotto, E., Ramina, L., Rampazzo, M., Raniero, W., Rebeschini, M., Rezynkina, K., Rosso, D., Scarcioffolo, M., Scarpa, D., Sedlák, M., Smith, R., Toniolo, N., Veronese, F., Volpe, V., Zago, L., Zanon, I., Zhang, G., Abels, R., Allegrini, M.L., Aufranc, C., Baulieu, G., Belkhiria, C., Benettoni, M., Benini, D., Bentley, M., Biasotto, M., Blaizot, M., Miquel, J. Blasco, Boiano, C., Boston, A., Boston, H., Boujrad, A., Bourgault, P., Bracco, A., Brambilla, S., Burrows, I., Camera, F., Capra, S., Capsoni, A., Cash, R., Civera, J.V., Clément, E., Coelli, S., Cordwell, M., Corradi, L., Coudert, S., De Angelis, G., De Ruvo, L., Debras, G., Del Fabbro, M., Diklić, J., Dosme, N., Duchene, G., Duclos, B., Dudouet, J., Eberth, J., Elloumi, S., Everett, C., Fantinel, S., Fillinger, M., Fioretto, E., Fransen, C., Gadea, A., Gibelin, L., González, V., Goupil, J., Görgen, C., Grant, A., Green, K., Ha, J., Hartnett, T., Henseler, K., Hess, H., Hirsch, R., Houarner, C., Jacob, J., Joannem, T., Judson, D.S., Karkour, N., Karolak, M., Kebbiri, M., Kieffer, J., Labiche, M., Lafay, X., Le Jeannic, P., Lefevre, A., Legay, E., Legruel, F., Lenzi, S., Leoni, S., Linget, D., Liptrot, M., López-Martens, A., Lotodé, A., Manara, L., Ménager, L., Mijatović, T., Million, B., Minarello, A., Montagnoli, G., Morrall, P., Mullacrane, I., Nyberg, J., Philippon, G., Polettini, M., Popieul, F., Pullia, A., Recchia, F., Reiter, P., Richardt, G., Rocchini, M., Roger, A., Saillant, F., Sanchis, E., Laskar, Md.S.R., Secci, G., Sigward, M.-H., Simpson, J., Solenne, N., Spee, F., Stefanini, A.M., Stézowski, O., Szilner, S., Templeton, N., Theisen, Ch., Thiel, S., Tomasi, F., Tzvetkov, S., Vigano, D., Viscione, E., Wieland, O., Wimmer, K., Wittwer, G., and Zielińska, M.

Published
2023
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6. Lifetime measurements using a plunger device and the EUCLIDES Si array at the GALILEO [formula omitted]-ray spectrometer

Author

Bradbury, J., Testov, D., Bakes, S., Goasduff, A., Mengoni, D., Valiente-Dobón, J.J., de Angelis, G., Bazzacco, D., Boiano, C., Boso, A., Cederwall, B., Cicerchia, M., Colucci, G., Čolović, P., Didierjean, F., Doncel, M., Dueñas, J.A., Galtarossa, F., Gozzelino, A., Hadyńska-Klȩk, K., Jaworski, G., John, P.R., Liu, H., Lenzi, S., Lunardi, S., Menegazzo, R., Mentana, A., Müller-Gatermann, C., Napoli, D.R., Pasqualato, G., Recchia, F., Rocchini, M., Riccetto, S., Saygi, B., Siciliano, M., Sobolev, Yu., and Szilner, S.

Published
2020
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8. The 35→ααHe+35→ααHe35→αα35→αα+35→αα reaction below the Coulomb barrier via the Trojan Horse Method

Author

Spitaleri, C., Typel, S., Bertulani, C. A., Mukhamedzhanov, A. M., Kajino, T., Lattuada, M., Cvetinović, A., Messina, S., Guardo, G. L., Soić, N., Milin, M., Perrotta, S. S., Li, Chengbo, Čolović, P., D’Agata, G., Dell’Aquila, D., Fatuzzo, C. G., Gulino, M., Hou, S. Q., Cognata, M. La, Lattuada, D., Nurkić, D., Popočovski, R., Skukan, N., Szilner, S., Trippella, O., Uroić, M., and Vukman, N.

Published
2021
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9. Study of the quasi-free 3He+9Be→3α reaction for the Trojan Horse Method

Author

Spitaleri, C., Lattuada, M., Cvetinović, A., Soić, N., Milin, M., Čolović, P., D’Agata, G., Dell’Aquila, D., Guardo, G. L., Gulino, M., Trippella, O., La Cognata, M., Lamia, L., Lattuada, D., Li, Chengbo, Messina, S., Nurkić, D., Perrotta, S. S., Pizzone, R. G., Popočonski, R., Romano, S., Skukan, N., Spartá, R., Szilner, S., Uroić, M., and Vukman, N.

Published
2020
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10. Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

Author

Torres, D. A., Chapman, R., Kumar, V., Hadinia, B., Hodsdon, A., Labiche, M., Liang, X., O’Donnell, D., Ollier, J., Orlandi, R., Smith, J. F., Spohr, K. -M., Wady, P., Wang, Z. M., Corradi, L., Fioretto, E., Gadea, A., de Angelis, G., Mărginean, N., Napoli, D. R., Sahin, E., Stefanini, A. M., Valiente-Dobón, J. J., Vedova, F. D., Axiotis, M., Martinez, T., Szilner, S., Bazzacco, D., Beghini, S., Farnea, E., Mărginean, R., Mengoni, D., Montagnoli, G., Recchia, F., Scarlassara, F., Ur, C. A., Lenzi, S. M., Lunardi, S., Kröll, T., Haas, F., Faul, T., Hjorth-Jensen, M., Carlsson, B. G., Freeman, S. J., Smith, A. G., Jones, G., Thompson, N., Pollarolo, G., and Simpson, G. S.

Published
2019
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12. Stretched configuration of states as inferred from γ -ray angular distributions in 40Ar + 208Pb neutron transfer reactions

Author

Čolović, P., Szilner, S., Corradi, L., Mijatović, T., Pollarolo, G., Goasduff, A., Montanari, D., Chapman, R., Fioretto, E., Gadea, A., Haas, F., Jelavić Malenica, D., Mărginean, N., Mengoni, D., Milin, M., Montagnoli, G., Scarlassara, F., Smith, J. F., Soić, N., Stefanini, A. M., Ur, C. A., and Valiente-Dobón, J. J.

Published
2017
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16. Study of collisions of the radioactive 24Ne beam at 7.9 MeV/u on 208Pb

Author

Benzoni, G., Azaiez, F., Stefan, G. I., Franchoo, S., Battacharyya, S., Borcea, R., Bracco, A., Corradi, L., Curien, D., De France, G., Dombradi, Zs., Fioretto, E., Grevy, S., Ibrahim, F., Leoni, S., Montanari, D., Mukherjee, G., Pollarolo, G., Redon, N., Regan, P. H., Schmitt, C., Sletten, G., Sohler, D., Stanoiu, M., Szilner, S., and Verney, D.

Published
2010
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17. Study of the population of neutron-rich heavy nuclei in the A~200 mass region via multinucleon transfer reactions

Author

Fioretto E., Corradi L., Galtarossa F., Szilner S., Montanari D., Mijatović T., Pollarolo G., Jia H.M., Ackermann D., Bourgin D., Colucci G., Courtin S., Fruet G., Goasduff A., Grebosz J., Haas F., Jelavić Malenica D., Jeong S.C., John P.R., Milin M., Montagnoli G., Skukan N., Scarlassara F., Soić N., Stefanini A.M., Strano E., Tokić V., Ur C.A, Valiente-Dobón J.J., and Watanabe Y.X.

Subjects
Physics, QC1-999
Abstract

Multineutron and multiproton transfer channels, populated in the inverse kinematics reaction 197Au+130Te at Elab=1.07 GeV, were measured at Laboratori Nazionali di Legnaro using the presently heaviest ion beam delivered by the PIAVE-ALPI accelerator complex and detecting both projectile-like and targetlike ions. To this end the large solid angle magnetic spectrometer PRISMA was coupled to a second arm for the detection of the heavy fragments in kinematic coincidence with the light ones selected and identified with the spectrometer. The data analysis is still in progress and will allow to compare the yields of both light and heavy partner with theoretical predictions performed with the GRAZING code to get quantitative information on transfer channels and the effect of evaporation and fission on the production rate of primary fragments. The mass integrated Z distribution, extracted from the experimental data, evidenced the population of proton pickup channels that, in conjunction with the neutron stripping ones from the 130Te, open the path for the production of neutron-rich heavy nuclei. In the following, we will present some preliminary results as well as details on the experimental configuration and perspectives for future investigations in the neutron-rich heavy region.

Published
2017
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18. Fusion hindrance for the positive Q-value system 12C+30Si

Author

Galtarossa F., Stefanini A. M., Montagnoli G., Jiang C. L., Colucci G., Bottoni S., Broggini C., Caciolli A., Colović P., Corradi L., Courtin S., Depalo R., Fioretto E., Fruet G., Gal A., Goasduff A., Heine M., Hu S. P., Kaur M., Mijatović T., Montanari D., Scarlassara F., Strano E., Szilner S., and Zhang G. X.

Subjects
Physics, QC1-999
Abstract

The fusion excitation function for the positive-Q-value system 12C+30Si (Qfus = +14.1 MeV) has been measured in inverse kinematics down to the μb level and compared with standard coupled-channel calculations. The appearance of the fusion hindrance phenomenon and the evidence of a S-factor maximum have been observed. This result can be significant to extrapolate the behavior of lighter astrophysical relevant systems at deep sub-barrier energies, where existing experimental data are still contradicting and affected by large errors.

Published
2017
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19. 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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20. Nucleon-nucleon correlations probed at far sub-Coulomb energies

Author

Szilner S., Corradi L., Montanari D., Mijatović T., Pollarolo G., Fioretto E., Goasduff A., Jelavić Malenica D., Mengoni D., Montagnoli G., Scarlassara F., Soić N., Stefanini A. M., and Valiente-Dobón J. J.

Subjects
Physics, QC1-999
Abstract

Excitation functions of one- and two-neutron transfer channels have been measured for the closed shell 40Ca+96Zr and superfluid 60Ni+116Sn systems from the Coulomb barrier energy to energies far below. By using the unique PRISMA performance in terms of resolution and efficiency, measurements at very low bombarding energies have been performed. In the case of the 60Ni+116Sn system, a complementary particle-γ coincident measurements provide the ground and excited state populations. The experimental transfer probabilities have been compared with semiclasical microscopic calculations that incorporate nucleon-nucleon correlations, together with known structure information of entrance and exit channels nuclei and reaction dynamics. These calculations well reproduce, in the whole energy range, one- and two-neutron transfer channels in shape and magnitude.

Published
2017
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21. Fusion of 12 C + 24 Mg at extreme sub-barrier energies.

Author

Montagnoli, G, Stefanini, A M, Jiang, C L, Hagino, K, Niola, F, Brugnara, D, Čolović, P, Colucci, G, Corradi, L, Depalo, R, Fioretto, E, Goasduff, A, Pasqualato, G, Scarlassara, F, Szilner, S, and Zanon, I

Subjects
THRESHOLD energy, WORK measurement, ENERGY function
Abstract

A recent experiment on 12C + 24Mg sub-barrier fusion was performed. Standard coupled-channels calculations clearly over-estimated the low energy cross sections and there was indication of a maximum of the astrophysical S factor vs energy. In the present work further measurements have been performed on the same system, and we extended the excitation function to lower energies down to σ ≃ 4 ÎĽ b, confirming the existence of the hindrance phenomenon. Additional energy points near the barrier were added as well. In agreement with the result of previous experiment, the hindrance energy threshold is observed to correspond to a remarkably large cross section. The present new data allow to better define the S -factor maximum, that is well fitted using two parametrizations of either the hindrance or the adiabatic model. We also performed coupled-channels calculations using a Woodsâ€"Saxon potential. Far below the barrier we observe that the coupling strengths decrease and tend to vanish, indeed one-dimensional tunnelling calculations well reproduce the excitation function. Further precise cross section measurements at slightly lower energies are needed to discriminate between the adiabatic and hindrance models. This would give a reliable guidance for the extrapolation to the systems of astrophysical interest, like 12C + 12C and 16O + 16O. [ABSTRACT FROM AUTHOR]

Published
2022
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22. In-beam γ spectroscopy using DIC with a radioactive Ne beam

Author

Benzoni, G., Azaiez, F., Leoni, S., Battacharyya, S., Borcea, R., Bracco, A., Corradi, L., Curien, D., De France, G., Dombrádi, Zs., Fioretto, E., Franchoo, S., Grevy, S., Ibrahim, F., Iulian, S., Mukherjee, G., Navin, A., Pollarolo, G., Redon, N., Regan, P. H., Rejmund, M., Schmitt, C., Sletten, G., Sohler, D., Stanoiu, M., Szilner, S., and Verney, D.

Published
2007
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23. Erratum to: Nuclear structure advancements with multi-nucleon transfer reactions.

Author

Pérez-Vidal, R. M., Galtarossa, F., Mijatović, T., Szilner, S., Zanon, I., Brugnara, D., Pellumaj, J., Ciemala, M., Valiente-Dobón, J. J., Corradi, L., Clément, E., Leoni, S., Fornal, B., Siciliano, M., and Gadea, A.

Subjects
PROTON transfer reactions, NUCLEAR structure, VELOCITY
Abstract

7Example of different TKEL conditions for 92 Mo using the shortest target-to-degrader distance. a Doppler-corrected spectrum without a TKEL condition. b Condition on the low part of the TKEL. c More restrictive condition on the low part of the TKEL. d Condition on the high part of the TKEL. 10Simulated Doppler corrected -ray spectra using the velocity from PRISMA (after the degrader) for 50 Ca showing the DSAM and RDDS techniques. The original article can be found online at https://doi.org/10.1140/epja/s10050-023-01027-2. [Extracted from the article]

Published
2023
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24. Fusion hindrance and quasi-fission in 48Ca induced reactions: Implications for super-heavy element production

Author

Trotta, M., Stefanini, A. M., Beghini, S., Behera, B. R., Chizhov, A. Yu., Corradi, L., Courtin, S., Fioretto, E., Gadea, A., Gomes, P. R. S., Haas, F., Itkis, I. M., Itkis, M. G., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Latina, A., Montagnoli, G., Pokrovsky, I. V., Rowley, N., Sagaidak, R. N., Scarlassara, F., Szanto de Toledo, A., Szilner, S., Voskressensky, V. M., and Wu, Y. W.

Published
2005
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25. Fusion-evaporation cross-sections for 48Ca + 154Sm near the Coulomb barrier: Evidence for fusion enhancement and hindrance

Author

Stefanini, A. M., Trotta, M., Behera, B. R., Corradi, L., Fioretto, E., Gadea, A., Latina, A., Szilner, S., Wu, Y. W., Beghini, S., Montagnoli, G., Scarlassara, F., Chizhov, A. Yu., Itkis, I. M., Kondratiev, N. A., Pokrovskiy, I. V., Sagaidak, R. N., Kniajeva, G. N., Kozulin, E. M., Voskressensky, V. M., Courtin, S., Haas, F., and Rowley, N.

Published
2005
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27. Shell effects in fusion-fission of heavy and superheavy nuclei

Author

Itkis, M. G., Beghini, S., Bogatchev, A. A., Corradi, L., Dorvaux, O., Hanappe, F., Gadea, A., Giardina, G., Itkis, I. M., Jandel, M., Kliman, J., Kniajeya, G. N., Kondratiev, N. A., Korzyukov, I. V., Kozulin, E. M., Krupa, L., Latina, L., Materna, T., Montagnoli, G., Oganessian, Yu. Ts., Pokrovsky, I. V., Prokhorova, E. V., Rowley, N., Rusanov, A. Ya., Scarlassara, F., Stefanini, A. M., Stuttgé, L., Szilner, S., Trotta, M., and Voskressenski, V. M.

Published
2004
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28. Fusion-fission of heavy and superheavy nuclei

Author

Itkis, M. G., Beghini, S., Bogatchev, A. A., Corradi, L., Dorvaux, O., Gadea, A., Giardina, G., Goverdovski, A. A., Hanappe, F., Itkis, I. M., Jandel, M., Kliman, J., Kniajeva, G. N., Kondratiev, N. A., Korzyukov, I. V., Kozulin, E. M., Krupa, L., Latina, L., Materna, T., Montagnoli, G., Moody, K. J., Oganessian, Yu. Ts., Pokrovsky, I. V., Ponomarenko, V. A., Prokhorova, E. V., Rowley, N., Rusanov, A. Ya., Scarlassara, F., Stefanini, A. M., Stuttgé, L., Szilner, S., Trotta, M., Vinodkumar, A. M., and Voskressensky, V. M.

Published
2003
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29. Search for cluster emission and extremely deformed shapes using charged-particle spectroscopy

Author

Beck, C., Rousseau, M., Papka, P., Sànchez i Zafra, A., Bhattacharya, C., Rauch, V., Bednarczyk, P., Courtin, S., Dorvaux, O., Haas, F., Nourreddine, A., Piqueras, I., Robin, J., El Bakali, L., Enaux, C., Galmar, E., Szilner, S., Stezowski, O., Prévost, A., Thummerer, S., von Oertzen, W., Hachem, A., Martin, E., Fahli, A., Morsad, A., Szanto de Toledo, A., and Sanders, S. J.

Published
2003
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30. Coupling a CLOVER detector array with the PRISMA magnetic spectrometer: Investigation of moderately neutron-rich nuclei populated by multinucleon transfer and deep inelastic collisions

Author

Gadea, A., Napoli, D. R., de Angelis, G., Menegazzo, R., Stefanini, A. M., Corradi, L., Axiotis, M., Berti, L., Fioretto, E., Kroell, T., Latina, A., Marginean, N., Maron, G., Martinez, T., Rosso, D., Rusu, C., Toniolo, N., Szilner, S., Trotta, M., Bazzacco, D., Beghini, S., Bellato, M., Brandolini, F., Farnea, E., Isocrate, R., Lenzi, S. M., Lunardi, S., Montagnoli, G., Pavan, P., Rossi Alvarez, C., Scarlassara, F., Ur, C., Blasi, N., Bracco, A., Camera, F., Leoni, S., Million, B., Pignanelli, M., Pollarolo, G., DeRosa, A., Inglima, G., La Commara, M., La Rana, G., Pierroutsakou, D., Romoli, M., Sandoli, M., Bizzeti, P. G., Bizzeti-Sona, A. M., Lo Bianco, G., Petrache, C. M., Zucchiatti, A., Cocconi, P., Quintana, B., Beck, Ch, Curien, D., Duchene, G., Haas, F., Medina, P., Papka, P., Durell, J., Freeman, S. J., Smith, A., Varley, B., Fayz, K., Pucknell, V., Simpson, J., Gelletly, W., Regan, P., The EUROBALL, and PRISMA-2 Collaboration

Published
2003
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31. Fusion reactions of 58,64Ni+124Sn

Author

Galtarossa F., Jiang C.L., Stefanini A.M., Esbensen H., Rehm K.E., Almaraz Calderon S., Avila M.L., Back B.B., Bourgin D., Corradi L., Courtin S., Fioretto E., Goasduff A., Haas F., Mazzocco M., Montanari D., Montagnoli G., Mijiatovic T., Sagaidak R., Santiago-Gonzalez D., Scarlassara F., Strano E., and Szilner S.

Subjects
Physics, QC1-999
Abstract

In order to better understand the influence of transfer in sub-barrier nuclear reactions, cross sections for the system 58,64Ni+124Sn have been measured down to 0.5-1 µb and compared to detailed coupledchannel calculations. In agreement with a phenomenological Q-value systematics, calculations show the importance of including the coupling to the transfer channel for these heavy systems. No clear evidence of fusion hindrance is observed, probably due to the fact that the cross sections measured in this experiment are not low enough for the appearance of that phenomenon.

Published
2016
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32. Probing nucleon-nucleon correlations in heavy-ion transfer reactions

Author

Szilner S.

Subjects
Physics, QC1-999
Abstract

The γ-particle coincident measurements, performed by coupling of the PRISMA spectrometer to the large γ arrays (CLARA and AGATA), demonstrate a strong interplay between single-particle and collective degrees of freedom that is pertinent to the reaction dynamics. By using the unique PRISMA performance in terms of both resolution and efficiency, measurements at very low bombarding energies have been performed. Via transfer of nucleon pairs, valuable information on the component responsible for particle correlations has been derived.

Published
2016
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33. Sub-barrier fusion and transfers in the 40Ca + 58,64Ni systems

Author

Bourgin D., Courtin S., Haas F., Goasduff A., Stefanini A.M., Montagnoli G., Montanari D., Corradi L., Huiming J., Scarlassara F., Fioretto E., Simenel C., Rowley N., Szilner S., and Mijatović T.

Subjects
Physics, QC1-999
Abstract

Fusion cross sections have been measured in the 40Ca + 58Ni and 40Ca + 64Ni systems at energies around and below the Coulomb barrier. The 40Ca beam was delivered by the XTU Tandem accelerator of the Laboratori Nazionali di Legnaro and evaporation residues were measured at very forward angles with the LNL electrostatic beam deflector. Coupled-channels calculations were performed which highlight possible strong effects of neutron transfers on the fusion below the barrier in the 40Ca + 64Ni system. Microscopic time-dependent Hartree-Fock calculations have also been performed for both systems. Preliminary results are shown.

Published
2016
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34. Recent experiments in inverse kinematics with the magnetic spectrometer PRISMA

Author

Fioretto E., Corradi L., Montanari D., Szilner S., Pollarolo G., Galtarossa F., Ackermann D., Montagnoli G., Scarlassara F., Stefanini A.M., Courtin S., Goasduff A., Haas F., Jelavić-Malenica D., Michelagnoli C., Mijatović T., Soić N., Ur C., and Valiente-Dobon J.J.

Subjects
Physics, QC1-999
Abstract

In the last period, two classes of experiments have been carried out with the large acceptance magnetic spectrometer PRISMA. In particular, the one- and two-neutron transfer processes at energies ranging from the Coulomb barrier to deep below it and the population of exotic neutron rich nuclei in the A~130 and A~200 mass regions have been studied. Both kinds of experiments have been performed in inverse kinematics identifying in A, Z and velocity the light target-like recoils with PRISMA placed at very forward angles in order to have, at the same time, high efficiency and good energy and mass resolutions.

Published
2016
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37. The heavy-ion magnetic spectrometer PRISMA

Author

Mason, P., Marginean, N., Montagnoli, G., Beghini, S., Scarlassara, F., Farnea, E., Ur, C. A., Meroni, A., Stefanini, A. M., Corradi, L., Fioretto, E., Pokrovskiy, I. V., Guiot, B., Gadea, A., Valiente-Dobón, J. J., Della Vedova, F., Orlandi, R., Sahin, E., Napoli, D. R., Berti, L., Toniolo, N., Szilner, S., Trotta, M., Romoli, M., La Commara, M., Pierroutsakou, D., Sandoli, M., Pollarolo, G., and Benzoni, G.

Published
2007
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40. Fusion Hindrance and Quadrupole Collectivity in Collisions of A≃50 Nuclei: The Case of 48Ti + 58Fe

Author

Stefanini A. M., Montagnoli G., Corradi L., Courtin S., Bourgin D., Fioretto E., Goasduff A., Grebosz J., Haas F., Mazzocco M., Mijatović T., Montanari D., Parascandolo C., Scarlassara F., Strano E., Szilner S., Toniolo N., and Torresi D.

Subjects
Physics, QC1-999
Abstract

The fusion excitation function of 48Ti + 58Fe has been measured in a wide energy range around the Coulomb barrier, covering 6 orders of magnitude of the cross sections. We present here the preliminary results of this experiment, and a full comparison with the near-by system 58Ni + 54Fe where evidence of fusion hindrance shows up at relatively high cross sections. The sub-barrier cross sections of 48Ti + 58Fe are much larger than those of 58Ni + 54Fe. Significant differences are also observed in the logarithmic derivatives, astro-physical S-factors and fusion barrier distributions. The influence of low-energy nuclear structure on all these trends is pointed out and commented. Coupled-channels calculations using a Woods-Saxon potential are able to reproduce the experimental results for 48Ti + 58Fe. The logarithmic derivative of the excitation function is very nicely fit, and no evidence of hindrance is observed down to around 1 μb. The fusion barrier distribution is rather wide, flat and structureless. It is only in qualitative agreement with the calculated distribution.

Published
2015
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41. Probing nucleon-nucleon correlations via heavy ion transfer reactions

Author

Szilner S.

Subjects
Physics, QC1-999
Abstract

The revival of transfer reaction studies benefited from the construction of the new generation large solid angle spectrometers, coupled to large γ arrays. The recent results of γ-particle coincident measurements demonstrate a strong interplay between single-particle and collective degrees of freedom that is pertinent to the reaction dynamics. By studies of transfer of pairs, valuable information on the component responsible for particle correlations has been derived.

Published
2015
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42. Transfer couplings and hindrance far below the barrier for 40Ca + 96Zr

Author

Stefanini A.M., Montagnoli G., Esbensen H., Corradi L., Courtin S., Fioretto E., Goasduff A., Grebosz J., Haas F., Mazzocco M., Michelagnoli C., Mijatović T., Montanari D., Pasqualato G., Parascandolo C., Scarlassara F., Strano E., Szilner S., Toniolo N., and Torresi D.

Subjects
Physics, QC1-999
Abstract

The sub-barrier fusion excitation function of 40Ca + 96Zr has been measured down to cross sections ≃2.4µb, i.e. two orders of magnitude smaller than obtained in the previous experiment, where the sub-barrier fusion of this system was found to be greatly enhanced with respect to 40Ca + 90Zr, and the need of coupling to transfer channels was suggested. The purpose of this work was to investigate the behavior of 40Ca + 96Zr fusion far below the barrier. The smooth trend of the excitation function has been found to continue, and the logarithmic slope increases very slowly. No indication of hindrance shows up, and a comparison with 48Ca + 96Zr is very useful in this respect. A new CC analysis of the complete excitation function has been performed, including explicitly one- and two-nucleon Q >0 transfer channels. Such transfer couplings bring significant cross section enhancements, even at the level of a few µb. Locating the hindrance threshold, if any, in 40Ca + 96Zr would require challenging measurements of cross sections in the sub-µb range.

Published
2015
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43. Exploring the influence of transfer channels on fusion reactions: the case of 40Ca + 58,64Ni

Author

Bourgin D., Courtin S., Haas F., Goasduff A., Stefanini A.M., Montagnoli G., Montanari D., Corradi L., Huiming J., Scarlassara F., Fioretto E., Simenel C., Rowley N., Jiang C.L., Szilner S., and Mijatović T.

Subjects
Physics, QC1-999
Abstract

Fusion cross sections have been measured in the 40Ca + 58Ni and 40Ca + 64Ni systems at beam energies ranging from Elab = 104.75 MeV to 153.5 MeV using the Laboratori Nazionali di Legnaro electrostatic deflector. Distributions of barriers have been extracted from the experimental data. Preliminary coupled channel calculations were performed and hints of effects of neutron transfers on the fusion below the barrier in the 40Ca + 64Ni are discussed.

Published
2015
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44. Spin distribution measurement for 64Ni + 100Mo at near and above barrier energies

Author

Singh Varinderjit, Ackermann D., Antalic S., Axiotis M., Bazzacco D., Corradi L., De Angelis G., Farnea E., Gadea A., Heßberger F.P., Itkis M.G., Kniajeva G.N., Kozulin E.M., Martinez T., Marginean N., Menegazzo R., Montagnoli G., Napoli D.R., Oganessian Yu. Ts., Ruan M., Sagaidak R.N., Scarlassara F., Stefanini A.M., Szilner S., and Ur C.

Subjects
Physics, QC1-999
Abstract

Spin distribution measurements were performed for the reaction 64Ni + 100Mo at three beam energies ranging from 230 to 260 MeV. Compound nucleus (CN) spin distributions were obtained channel selective for each evaporation residue populated by the de-excitation cascade. A comparison of the spin distribution at different beam energies indicates that its slope becomes steeper and steeper with increasing beam energy. This change in slope of the spin distribution is mainly due to the onset of fission competition with particle evaporation at higher beam energies.

Published
2015
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45. Transfer probability measurements in the superfluid 116Sn+60Ni system

Author

Montanari D., Corradi L., Szilner S., Pollarolo G., Fioretto E., Stefanini A.M., Farnea E., Michelagnoli C., Montagnoli G., Scarlassara F., Ur C.A., Courtin S., Goasduff A., Haas F., Mijatović T., and Soić N.

Subjects
Physics, QC1-999
Abstract

We measured excitation functions for the main transfer channels in the 116Sn+60Ni reaction from above to well below the Coulomb barrier. The experiment has been performed in inverse kinematics, detecting the lighter (target-like) ions with the magnetic spectrometer PRISMA at very forward angles. The comparison between the data and microscopic calculations for the present case and for the previously measured 96Zr+40Ca system, namely superfluid and near closed shells nuclei, should significantly improve our understanding of nucleon-nucleon correlation properties in multinucleon transfer processes.

Published
2014
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46. Study of shape transition in the neutron-rich Os isotopes

Author

John P.R., Modamio V., Valiente-Dobón J.J., Mengoni D., Gottardo A., Bazzacco D., Lunardi S., Alexander T., Angelis G. de, Ashwood N., Barr M., Bizzeti P.G., Bizzeti-Sona A.M., Bottoni S., Bowry M., Bracco A., Browne F., Bunce M., Gadea A., Camera F., Corradi L., Crespi F.C.L., Farnea E., Fioretto E., Kokalova Tz., Korten W., Kuşoğlu A., Lenzi S., Leoni S., Michelagnoli C., Mijatović T., Montagnoli G., Montanari D., Napoli D.R., Podolyák Zs., Pollarolo G., Recchia F., Roberts O.J., Şahin E., Salsac M.-D., Scarlassara F., Stefanini A.M., Szilner S., Ur C.A., Walshe J., and Wheldon C.

Subjects
Physics, QC1-999
Abstract

The neutron-rich isotopes of tungsten, osmium and platinum have different shapes in their ground states and present also shape transitions phenomena. Spectroscopic information for these nuclei is scarce and often limited to the gamma rays from the decay of isomeric states. For the neutron-rich even-even osmium isotopes 194Os and 198Os, a shape transition between a slightly prolate deformed to an oblate deformed ground state was deduced from the observed level schemes. For the even-even nucleus lying in between, 196Os, no gamma ray transition is known. In order to elucidate the shape transition and to test the nuclear models describing it, this region was investigated through gamma-ray spectroscopy using the AGATA demonstrator and the large acceptance heavy-ion spectrometer PRISMA at LNL, Italy. A two-nucleon transfer from a 198Pt target to a stable 82Se beam was utilized to populate medium-high spin states of 196Os. The analysis method and preliminary results, including the first life-time measurement of isomeric states with AGATA, are presented.

Published
2014
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47. Fusion of 28Si + 28Si: oscillations above the barrier and the behavior down to 1μb

Author

Stefanini A.M., Montagnoli G., Corradi L., Courtin S., Fioretto E., Grebosz J., Haas F., Jia H.M., Mazzocco M., Michelagnoli C., Mijatović T., Montanari D., Parascandolo C., Scarlassara F., Strano E., Szilner S., Torresi D., and Ur C.A.

Subjects
Physics, QC1-999
Abstract

Fusion excitation functions of light heavy-ion systems show oscillatory structures above the Coulomb barrier, caused by resonances or due to the penetration of successive centrifugal barriers well separated in energy. In heavier systems, the amplitude of oscillations decreases and the peaks get nearer to each other. This makes the measurements very challenging. We have performed a first experiment for 28Si + 28Si, by measuring fusion cross sections (σ) in an energy range of ≃15 MeV above the barrier, with a small ΔElab = 0.5 MeV step. Three regular oscillations are clearly observed, which are best revealed by plotting the energy-weighted derivative of the excitation function. The excitation function has been recently measured down to cross sections ≤1μb with larger energy steps. Coupled-channel (CC) calculations based on a shallow potential in the entrance channel are able to reproduce the oscillations. A further analysis will provide a stringent test for the calculations, in particular for the choice of the ion-ion potential, because the subbarrier excitation function has to be reproduced as well. Coupled-channel (CC) calculations based on a shallow potential in the entrance channel are able to reproduce the oscillations. A further analysis will provide a stringent test for the calculations, in particular for the choice of the ion-ion potential, because the subbarrier excitation function has to be reproduced as well.

Published
2014
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48. Reaction dynamics and nuclear structure of moderately neutron-rich Ne isotopes by heavy ion reactions

Author

Bottoni S., Benzoni G., Leoni S., Montanari D., Bracco A., Vigezzi E., Azaiez F., Corradi L., Bazzacco D., Farnea E., Gadea A., Szilner S., and Pollarolo G.

Subjects
Physics, QC1-999
Abstract

The heavy ion reaction 22Ne+208Pb at 128 MeV of bombarding energy has been studied using the PRISMA-CLARA experimental setup at Legnaro National Laboratories. Elastic, inelastic and one nucleon transfer cross sections have been measured. The experimental results are presented in parallel with the analysis on existing data for the unstable 24Ne nucleus, from the reaction 24Ne+208Pb at 182 MeV (measured at SPIRAL with the VAMOS-EXOGAM setup). The β2C charge deformation parameter for both 22Ne and 24Ne has been determined by a DWBA analysis of the experimental angular dis- tributions, showing a strong reduction for 24Ne.

Published
2014
Full Text
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49. Probing nucleon-nucleon correlations via heavy ion transfer reactions

Author

Szilner S.

Subjects
Physics, QC1-999
Abstract

The revival of transfer reaction studies benefited from the construction of the new generation large solid angle spectrometers, coupled to large γ arrays. The recent results of γ-particle coincident measurements demonstrate a strong interplay between single-particle and collective degrees of freedom that is pertinent to the reaction dynamics. Via transfer of pairs, valuable information on the component responsible for particle correlations has been derived.

Published
2014
Full Text
View/download PDF

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