The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
P. Figuera - One of the best experts on this subject based on the ideXlab platform.
-
Projectile structure effects in the collisions 6,7Li+64Zn around the Coulomb Barrier.
EPJ Web of Conferences, 2014Co-Authors: P. Figuera, A. Di Pietro, M. Fisichella, M. Lattuada, C. Maiolino, Matko Milin, A. Musumarra, V. Ostashko, M. G. Pellegriti, G. RandisiAbstract:We measured elastic scattering angular distributions and cross sections for heavy residue production for the systems 6,7 Li+ 64 Zn at different energies around the Coulomb Barrier. The elastic scattering angular distributions have been reproduced by optical model fits using a renormalized double folding potential for the real and imaginary parts. Absence of usual threshold anomaly in the optical potential was found. The excitation functions for heavy residue production were measured using an activation technique. Comparison with different calculations suggest that complete fusion is the dominant reaction mechanism above the Barrier whereas, below the Coulomb Barrier, incomplete fusion and transfer dominate.
-
Measurement of Li+Sn fusion excitation functions around the Coulomb Barrier using an improved activation technique
EPJ Web of Conferences, 2014Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, A. Musumarra, M. G. Pellegriti, A. C. Shotter, C. Marchetta, Chris Ruiz, Viviana ScuderiAbstract:Fusion excitation functions have been measured for the 6 Li+120 Sn and 7 Li+119 Sn systems at energies around the Coulomb Barrier, to investigate the effects of neutron transfer and breakup on the fusion process. At energies above the Barrier, a suppression of the complete fusion excitation function with respect to the prediction of the 1D - Barrier Penetration Model has been observed, in both cases. At energies below the Coulomb Barrier, no significant difference between the two excitation function, imputable to the different neutron transfer Q-values of the two systems has been observed.
-
Halo effects on fusion cross section in 4,6He+64Zn collision around and below the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, Matko Milin, A. Musumarra, M. G. Pellegriti, C. Marchetta, Viviana Scuderi, Natko SkukanAbstract:The structure of the halo nuclei is expected to influence the fusion mechanism at energies around and below the Coulomb Barrier. Here new data of 4He+64Zn at sub-Barrier energies are presented which cover the same energy region of previous measurements of 6He+64Zn. The fusion cross section was measured by using an activation technique where the radioactive evaporation residues produced in the reaction were identified by the X-ray emission which follows their electron capture decay. By comparing the two system, we observe an enhancement on the fusion cross section in the reaction induced by 6He, at energy below the Coulomb Barrier. It is shown that this enhancement seems to be due to static properties of halo 2n 6He nucleus.
-
Fusion Cross Section in the {sup 4,6}He+{sup 64}Zn Collisions Around the Coulomb Barrier
2011Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, Matko Milin, A. Musumarra, M. G. Pellegriti, C. Marchetta, Valentina Scuderi, Natko SkukanAbstract:New fusion data for the {sup 4}He+{sup 64}Zn system at sub-Barrier energies are measured to cover the same energy region of previous measurements for {sup 6}He+{sup 64}Zn. Aim of the experiment was to compare the fusion excitation functions for the two system to investigate on the effects of the {sup 6}He neutron-halo structure on the fusion reaction mechanism at energies around the Coulomb Barrier. The fusion cross section was measured by using an activation technique. Comparing the two systems, we observe an enhancement of the fusion cross section in the reaction induced by {sup 6}He, at and below the Coulomb Barrier.
-
Structure effects in the reactions 9,10,11Be+64Zn at the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: Viviana Scuderi, Joaquín Gómez-camacho, L. Acosta, M. J. G. Borge, P. Figuera, A. Di Pietro, M. Fisichella, F. Amorini, L.m. Fraile, H. JeppesenAbstract:Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies around the Coulomb Barrier. The elastic scattering angular distributions, measured for the three systems at the same center of mass energy, were analyzed within the Optical Model and reaction cross-sections were deduced from optical model calculations. For the 11Be induced reaction the transfer/break-up angular distribution was also extracted.
M. J. G. Borge - One of the best experts on this subject based on the ideXlab platform.
-
11Li Breakup on 208Pb at Energies Around the Coulomb Barrier
Physical review letters, 2013Co-Authors: J. P. Fernández-garcía, M. Cubero, M. Rodríguez-gallardo, L. Acosta, M. Alcorta, M. A. G. Alvarez, M. J. G. Borge, L. Buchmann, C. A. Diget, H. A. FalouAbstract:The inclusive breakup for the Li-11 + Pb-208 reaction at energies around the Coulomb Barrier has been measured for the first time. A sizable yield of Li-9 following the Li-11 dissociation has been observed, even at energies well below the Coulomb Barrier. Using the first-order semiclassical perturbation theory of Coulomb excitation it is shown that the breakup probability data measured at small angles can be used to extract effective breakup energy as well as the slope of B(E1) distribution close to the threshold. Four-body continuum-discretized coupled-channels calculations, including both nuclear and Coulomb couplings between the target and projectile to all orders, reproduce the measured inclusive breakup cross sections and support the presence of a dipole resonance in the Li-11 continuum at low excitation energy.
-
Elastic scattering of 9Li on 208Pb at energies around the Coulomb Barrier
2011Co-Authors: M. Cubero, J. P. Fernández-garcía, L. Acosta, M. Alcorta, M. A. G. Alvarez, M. J. G. Borge, L. Buchmann, J. A. Lay, D. G. Diget, B.r. FultonAbstract:We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb Barrier. This experiment was performed at ISAC‐II at TRIUMF with a world record in production of the post‐accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb Barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions.
-
Structure effects in the reactions 9,10,11Be+64Zn at the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: Viviana Scuderi, Joaquín Gómez-camacho, L. Acosta, M. J. G. Borge, P. Figuera, A. Di Pietro, M. Fisichella, F. Amorini, L.m. Fraile, H. JeppesenAbstract:Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies around the Coulomb Barrier. The elastic scattering angular distributions, measured for the three systems at the same center of mass energy, were analyzed within the Optical Model and reaction cross-sections were deduced from optical model calculations. For the 11Be induced reaction the transfer/break-up angular distribution was also extracted.
-
Structure effects in the reactions 9,10,11Be+ 64Zn at the Coulomb Barrier
2010Co-Authors: V. Scuderi, L. Acosta, M. J. G. Borge, P. Figuera, M. Fisichella, F. Amorini, L.m. Fraile, J. Gòmez-camacho, A.d. Pietro, H. JeppesenAbstract:Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies around the Coulomb Barrier. The elastic scattering angular distributions, measured for the three systems at the same center of mass energy, were analyzed within the Optical Model and reaction cross-sections were deduced from optical model calculations. For the 11Be induced reaction the transfer/break-up angular distribution was also extracted.
-
Study Of Reaction Mechanisms For {sup 9,10,11}Be+{sup 64}Zn Systems Around The Coulomb Barrier
2010Co-Authors: Valentina Scuderi, L. Acosta, M. J. G. Borge, P. Figuera, A. Di Pietro, M. Fisichella, F. Amorini, L.m. Fraile, J. Gòmez-camacho, H. B. JeppesenAbstract:The reactions 9,10,11Be+64Zn have been studied at energies around the Coulomb Barrier in order to better understand the role played by the halo features on the reaction dynamics. Preliminary results on such studies will be reported in this paper.
L. Acosta - One of the best experts on this subject based on the ideXlab platform.
-
11Li Breakup on 208Pb at Energies Around the Coulomb Barrier
Physical review letters, 2013Co-Authors: J. P. Fernández-garcía, M. Cubero, M. Rodríguez-gallardo, L. Acosta, M. Alcorta, M. A. G. Alvarez, M. J. G. Borge, L. Buchmann, C. A. Diget, H. A. FalouAbstract:The inclusive breakup for the Li-11 + Pb-208 reaction at energies around the Coulomb Barrier has been measured for the first time. A sizable yield of Li-9 following the Li-11 dissociation has been observed, even at energies well below the Coulomb Barrier. Using the first-order semiclassical perturbation theory of Coulomb excitation it is shown that the breakup probability data measured at small angles can be used to extract effective breakup energy as well as the slope of B(E1) distribution close to the threshold. Four-body continuum-discretized coupled-channels calculations, including both nuclear and Coulomb couplings between the target and projectile to all orders, reproduce the measured inclusive breakup cross sections and support the presence of a dipole resonance in the Li-11 continuum at low excitation energy.
-
Reactions of halo nuclei at energies around the Coulomb Barrier
2012Co-Authors: Ismael Martel, L. Acosta, A.m. Sánchez-benítez, Elí F. Aguilera, R. WolskiAbstract:Along the last few decades a large number of exotic nuclei have become available at low energies in a number of radioactive beam facilities. Close to the drip lines, the loosely bound valence nucleons and their extended wave functions produce new phenomena, like exotic cluster structures, pigmy dipole resonances and the formation of skins and haloes. In this paper we review present data on the scattering of 6He on heavy targets in a range of energies around the Coulomb Barrier.
-
Scattering of 8He on 208Pb at Energies Around the Coulomb Barrier
2011Co-Authors: G. Marquínez-durán, L. Acosta, M. A. G. Alvarez, A.m. Sánchez-benítez, Ismael Martel, R. Berjillos, J. Dueñas, V.v. Parkar, K. Rusek, J. Gòmez-camachoAbstract:We have measured the angular distributions of elastic scattering and 6,4He fragments produced in the collisions of an exotic beam of 8He on a 208Pb target at laboratory energies of 18 and 22 MeV, just around the Coulomb Barrier (19 MeV). The measurements were performed at the SPIRAL/GANIL facility in Caen, France. In this paper, we present preliminary data on elastic cross sections and discuss the results using optical model and coupled reaction channel calculations.
-
Elastic scattering of 9Li on 208Pb at energies around the Coulomb Barrier
2011Co-Authors: M. Cubero, J. P. Fernández-garcía, L. Acosta, M. Alcorta, M. A. G. Alvarez, M. J. G. Borge, L. Buchmann, J. A. Lay, D. G. Diget, B.r. FultonAbstract:We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb Barrier. This experiment was performed at ISAC‐II at TRIUMF with a world record in production of the post‐accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb Barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions.
-
Structure effects in the reactions 9,10,11Be+64Zn at the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: Viviana Scuderi, Joaquín Gómez-camacho, L. Acosta, M. J. G. Borge, P. Figuera, A. Di Pietro, M. Fisichella, F. Amorini, L.m. Fraile, H. JeppesenAbstract:Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies around the Coulomb Barrier. The elastic scattering angular distributions, measured for the three systems at the same center of mass energy, were analyzed within the Optical Model and reaction cross-sections were deduced from optical model calculations. For the 11Be induced reaction the transfer/break-up angular distribution was also extracted.
M. Fisichella - One of the best experts on this subject based on the ideXlab platform.
-
Projectile structure effects in the collisions 6,7Li+64Zn around the Coulomb Barrier.
EPJ Web of Conferences, 2014Co-Authors: P. Figuera, A. Di Pietro, M. Fisichella, M. Lattuada, C. Maiolino, Matko Milin, A. Musumarra, V. Ostashko, M. G. Pellegriti, G. RandisiAbstract:We measured elastic scattering angular distributions and cross sections for heavy residue production for the systems 6,7 Li+ 64 Zn at different energies around the Coulomb Barrier. The elastic scattering angular distributions have been reproduced by optical model fits using a renormalized double folding potential for the real and imaginary parts. Absence of usual threshold anomaly in the optical potential was found. The excitation functions for heavy residue production were measured using an activation technique. Comparison with different calculations suggest that complete fusion is the dominant reaction mechanism above the Barrier whereas, below the Coulomb Barrier, incomplete fusion and transfer dominate.
-
Measurement of Li+Sn fusion excitation functions around the Coulomb Barrier using an improved activation technique
EPJ Web of Conferences, 2014Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, A. Musumarra, M. G. Pellegriti, A. C. Shotter, C. Marchetta, Chris Ruiz, Viviana ScuderiAbstract:Fusion excitation functions have been measured for the 6 Li+120 Sn and 7 Li+119 Sn systems at energies around the Coulomb Barrier, to investigate the effects of neutron transfer and breakup on the fusion process. At energies above the Barrier, a suppression of the complete fusion excitation function with respect to the prediction of the 1D - Barrier Penetration Model has been observed, in both cases. At energies below the Coulomb Barrier, no significant difference between the two excitation function, imputable to the different neutron transfer Q-values of the two systems has been observed.
-
Halo effects on fusion cross section in 4,6He+64Zn collision around and below the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, Matko Milin, A. Musumarra, M. G. Pellegriti, C. Marchetta, Viviana Scuderi, Natko SkukanAbstract:The structure of the halo nuclei is expected to influence the fusion mechanism at energies around and below the Coulomb Barrier. Here new data of 4He+64Zn at sub-Barrier energies are presented which cover the same energy region of previous measurements of 6He+64Zn. The fusion cross section was measured by using an activation technique where the radioactive evaporation residues produced in the reaction were identified by the X-ray emission which follows their electron capture decay. By comparing the two system, we observe an enhancement on the fusion cross section in the reaction induced by 6He, at energy below the Coulomb Barrier. It is shown that this enhancement seems to be due to static properties of halo 2n 6He nucleus.
-
Fusion Cross Section in the {sup 4,6}He+{sup 64}Zn Collisions Around the Coulomb Barrier
2011Co-Authors: M. Fisichella, P. Figuera, A. Di Pietro, M. Lattuada, Matko Milin, A. Musumarra, M. G. Pellegriti, C. Marchetta, Valentina Scuderi, Natko SkukanAbstract:New fusion data for the {sup 4}He+{sup 64}Zn system at sub-Barrier energies are measured to cover the same energy region of previous measurements for {sup 6}He+{sup 64}Zn. Aim of the experiment was to compare the fusion excitation functions for the two system to investigate on the effects of the {sup 6}He neutron-halo structure on the fusion reaction mechanism at energies around the Coulomb Barrier. The fusion cross section was measured by using an activation technique. Comparing the two systems, we observe an enhancement of the fusion cross section in the reaction induced by {sup 6}He, at and below the Coulomb Barrier.
-
Structure effects in the reactions 9,10,11Be+64Zn at the Coulomb Barrier
Journal of Physics: Conference Series, 2011Co-Authors: Viviana Scuderi, Joaquín Gómez-camacho, L. Acosta, M. J. G. Borge, P. Figuera, A. Di Pietro, M. Fisichella, F. Amorini, L.m. Fraile, H. JeppesenAbstract:Elastic scattering and direct reactions have been studied for the collisions induced by the three Beryllium isotopes 9,10,11Be, on a medium mass 64Zn target at energies around the Coulomb Barrier. The elastic scattering angular distributions, measured for the three systems at the same center of mass energy, were analyzed within the Optical Model and reaction cross-sections were deduced from optical model calculations. For the 11Be induced reaction the transfer/break-up angular distribution was also extracted.
C. Signorini - One of the best experts on this subject based on the ideXlab platform.
-
8B + 208Pb Elastic Scattering at Coulomb Barrier Energies
Journal of Physics: Conference Series, 2018Co-Authors: M. La Commara, M. Mazzocco, A. Boiano, C. Boiano, C. Manea, C. Parascandolo, D. Pierroutsakou, C. Signorini, E. Strano, D. TorresiAbstract:The scattering process of weakly-bound nuclei at Coulomb Barrier energies provides deep insights on the reaction dynamics induced by exotic nuclei. Within this framework, we measured for the first time the scattering process of the short-lived Radioactive Ion Beam (RIB) 8B (Sp = 0.1375 MeV) from a 208Pb target at 50 MeV beam energy. The 8B RIB was produced by means of the in-flight facility CRIB (RIKEN, Japan) with an average intensity on target of 10 kHz and a purity about 25%. Elastically scattering ions were detected in the angular range θc.m. = 10°-160° by means of the detector array EXPADES. A preliminary optical model analysis indicates a total reaction cross section of about 1 b, a value, once reduced, 2-3 times larger than those obtained for the reactions induced by the stable weakly-bound projectiles 6,7Li on a 208Pb target in the energy range around the Coulomb Barrier.
-
8b 208pb elastic scattering at Coulomb Barrier energies
12th International Spring Seminar on Nuclear Physics: Current Problems and Prospects for Nuclear Structure, 2018Co-Authors: M. La Commara, M. Mazzocco, A. Boiano, C. Boiano, C. Manea, C. Parascandolo, D. Pierroutsakou, C. Signorini, E. Strano, D. TorresiAbstract:The scattering process of weakly-bound nuclei at Coulomb Barrier energies provides deep insights on the reaction dynamics induced by exotic nuclei. Within this framework, we measured for the first time the scattering process of the short-lived Radioactive Ion Beam (RIB) 8B (Sp = 0.1375 MeV) from a 208Pb target at 50 MeV beam energy. The 8B RIB was produced by means of the in-flight facility CRIB (RIKEN, Japan) with an average intensity on target of 10 kHz and a purity about 25%. Elastically scattering ions were detected in the angular range θc.m. = 10°-160° by means of the detector array EXPADES. A preliminary optical model analysis indicates a total reaction cross section of about 1 b, a value, once reduced, 2-3 times larger than those obtained for the reactions induced by the stable weakly-bound projectiles 6,7Li on a 208Pb target in the energy range around the Coulomb Barrier.
-
7Be-and 8B-reaction dynamics at Coulomb Barrier energies
EPJ Web of Conferences, 2016Co-Authors: M. Mazzocco, A. Boiano, C. Boiano, M. La Commara, C. Manea, C. Parascandolo, D. Pierroutsakou, C. Signorini, E. Strano, D. TorresiAbstract:We investigated the reaction dynamics induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at energies around the Coulomb Barrier. The two measurements are strongly interconnected, being 7 Be (Sα = 1.586 MeV) the loosely bound core of the even more exotic 8 B (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.
-
Interaction of 17F with a 208Pb target below the Coulomb Barrier
The European Physical Journal A, 2010Co-Authors: C. Signorini, M. Mazzocco, M. La Commara, D. Pierroutsakou, M. Romoli, R. Bonetti, T. Glodariu, A. Guglielmetti, B. Martin, M. SandoliAbstract:The interaction of loosely bound (Sp = 600 keV) 17F ions with a 208Pb target was studied at Elab = 86 MeV, below the Coulomb Barrier, by measuring the differential cross-section for the quasi-elastic scattering and the cross-section for the exclusive breakup process 17F \( \rightarrow\)16O + p . The small reaction and exclusive breakup cross-sections confirm the small reactivity of this system, even at low energy, and indicates that the 17F small binding energy plays a minor role in the reaction dynamics.
-
elastic scattering for the system 11be 209bi at Coulomb Barrier energies
European Physical Journal-special Topics, 2007Co-Authors: M. Mazzocco, C. Signorini, M. Romoli, R. Bonetti, A. De Francesco, A. De Rosa, M. Di Pietro, Lorenzo Fortunato, T. Glodariu, A. GuglielmettiAbstract:The elastic scattering process for 11Be ions impinging on a 209Bi target was studied in the energy range around the Coulomb Barrier. The angular distributions of the 11Be scattered particles were analyzed within the optical model framework in order to evaluate the reaction cross section, which turned out to be much larger than the fusion one, especially in the sub-Barrier region. The comparison with the system 9Be + 209Bi showed that the reaction cross section is larger for the reaction 11Be + 209Bi in the energy range around the Coulomb Barrier, while they are rather similar at higher bombarding energies. This result suggests that direct processes related to the 11Be halo structure and lower binding energy are more relevant at near-Barrier energies.
