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  1. Article ; Online: Fusion hindrance for a positive-q-value system (24)Mg+(30)Si.

    Jiang, C L / Stefanini, A M / Esbensen, H / Rehm, K E / Almaraz-Calderon, S / Back, B B / Corradi, L / Fioretto, E / Montagnoli, G / Scarlassara, F / Montanari, D / Courtin, S / Bourgin, D / Haas, F / Goasduff, A / Szilner, S / Mijatovic, T

    Physical review letters

    2014  Volume 113, Issue 2, Page(s) 22701

    Abstract: Measurements of the excitation function for the fusion of (24)Mg+(30)Si (Q=17.89  MeV)have been extended toward lower energies with respect to previous experimental data. The S-factor maximum observed in this large, positive-Q-value system is the most ... ...

    Abstract Measurements of the excitation function for the fusion of (24)Mg+(30)Si (Q=17.89  MeV)have been extended toward lower energies with respect to previous experimental data. The S-factor maximum observed in this large, positive-Q-value system is the most pronounced among such systems studied thus far. The significance and the systematics of an S-factor maximum in systems with positive fusion Q values are discussed. This result would strongly impact the extrapolated cross sections and reaction rates in the carbon and oxygen burnings and, thus, the study of the history of stellar evolution.
    Language English
    Publishing date 2014-07-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.113.022701
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Neutron pair transfer in (60)Ni+(116)Sn far below the Coulomb barrier.

    Montanari, D / Corradi, L / Szilner, S / Pollarolo, G / Fioretto, E / Montagnoli, G / Scarlassara, F / Stefanini, A M / Courtin, S / Goasduff, A / Haas, F / Jelavić Malenica, D / Michelagnoli, C / Mijatović, T / Soić, N / Ur, C A / Varga Pajtler, M

    Physical review letters

    2014  Volume 113, Issue 5, Page(s) 52501

    Abstract: An excitation function of one- and two-neutron transfer channels for the ^{60}Ni+^{116}Sn system has been measured with the magnetic spectrometer PRISMA in a wide energy range, from the Coulomb barrier to far below it. The experimental transfer ... ...

    Abstract An excitation function of one- and two-neutron transfer channels for the ^{60}Ni+^{116}Sn system has been measured with the magnetic spectrometer PRISMA in a wide energy range, from the Coulomb barrier to far below it. The experimental transfer probabilities are well reproduced, for the first time with heavy ions, in absolute values and in slope by microscopic calculations which incorporate nucleon-nucleon pairing correlations.
    Language English
    Publishing date 2014-08-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.113.052501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Fusion Hindrance and Quadrupole Collectivity in Collisions of A≃50 Nuclei

    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. / Torresi D.

    EPJ Web of Conferences, Vol 86, p

    The Case of 48Ti + 58Fe

    2015  Volume 00057

    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 ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Transfer couplings and hindrance far below the barrier for 40Ca + 96Zr

    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. /
    Torresi D.

    EPJ Web of Conferences, Vol 86, p

    2015  Volume 00056

    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 ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Subject code 530
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Exploring the influence of transfer channels on fusion reactions

    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. / Mijatović T.

    EPJ Web of Conferences, Vol 86, p

    the case of 40Ca + 58,64Ni

    2015  Volume 00005

    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 ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Transfer probability measurements in the superfluid 116Sn+60Ni system

    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. / Soić N.

    EPJ Web of Conferences, Vol 66, p

    2014  Volume 03063

    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 ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Fusion of 28Si + 28Si

    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. / Ur C.A.

    EPJ Web of Conferences, Vol 66, p

    oscillations above the barrier and the behavior down to 1μb

    2014  Volume 03082

    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 ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Subject code 541
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Heavy-ion transfer reactions at large internuclear distances using the PRISMA magnetic spectrometer

    Montanari D. J. / 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. / Soić N.

    EPJ Web of Conferences, Vol 63, p

    2013  Volume 02006

    Abstract: We measured excitation functions for the main transfer channels in the 116Sn+60Ni reaction at different bombarding energies from above to well below the Coulomb barrier. The experiment has been performed in inverse kinematics, detecting the lighter ( ... ...

    Abstract We measured excitation functions for the main transfer channels in the 116Sn+60Ni reaction at different bombarding energies 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. Good mass, nuclear charge and kinetic energy resolutions have been achieved. 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.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2013-12-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Pair transfer processes probed at deep sub barrier energies

    Scarlassara F. / Montanari D. / Montagnoli G. / Michelagnoli C. / Mărginean N. / Jelavić-Malenica D. / Gadea A. / Haas F. / Fioretto E. / Farnea E. / Mason P. / Szilner S. / Pollarolo G. / Corradi L. / Soić N. / Stefanini A.M. / Ur C.A. / Valiente-Dobón J.J.

    EPJ Web of Conferences, Vol 17, p

    2011  Volume 08004

    Abstract: Multinucleon transfer cross sections in the system 40Ca+96Zr have been measured at bombarding energies ranging from the Coulomb barrier to ~ 25% below. Target-like (lighter) recoils in inverse kinematics have been completely identif ed in A,Z and Q-value ...

    Abstract Multinucleon transfer cross sections in the system 40Ca+96Zr have been measured at bombarding energies ranging from the Coulomb barrier to ~ 25% below. Target-like (lighter) recoils in inverse kinematics have been completely identif ed in A,Z and Q-value with the large solid angle magnetic spectrometer PRISMA. The experimental slopes of the neutron transfer probabilities at large internuclear separation are consistent with the values derived from the binding energies. A phenomenological interpretation of the transfer probabilities indicates the presence of enhanced values for the even number of neutron transfers.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2011-10-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Spin distribution measurement for 64Ni + 100Mo at near and above barrier energies

    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. / Ur C.

    EPJ Web of Conferences, Vol 86, p

    2015  Volume 00053

    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- ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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