Fusion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mtext>40</mml:mtext></mml:msup><mml:mtext>Ca</mml:mtext><mml:mo>+</mml:mo><mml:msup><mml:mrow /><mml:mtext>40</mml:mtext></mml:msup><mml:mtext>Ca</mml:mtext></mml:mrow></mml:math>and other<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Ca</mml:mtext><mml:mo>+</mml:mo><mml:mtext>Ca</mml:mtext></mml:mrow></mml:math>systems near and below the ba

Montagnoli, G.; Stefanini, A. M.; Jiang, C. L.; Esbensen, H.; Corradi, L.; Courtin, S.; Fioretto, E.; Goasduff, A.; Haas, F.; Kifle, A. F.; Michelagnoli, C.; Montanari, D.; Mijatović, T.; Rehm, K. E.; Silvestri, Riccardo; Singh, Pushpendra P.; Scarlassara, F.; Szilner, S.; Tang, Xiaodong; Ur, C. A.

doi:10.1103/physrevc.85.024607

Cited by 117 publications

(117 citation statements)

References 27 publications

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“…This is illustrated in Fig. 4 which compares the DCFHF potentials for the three 40,48 Ca+ 40,48 Ca systems. At touching distance, additional neutrons increase the barrier radius (due to the neutron skin) and thus decrease its height.…”

mentioning

confidence: 99%

“…Note also that, once dynamics is included, fusion in these systems may behave differently and static effects on the bare potential could be washed out by the dynamics [33]. In particular, fusion in the 40 Ca+ 48 Ca system is expected to be strongly affected by transfer channels [40,46], a feature which has only recently been studied in microscopic approach [47].…”

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confidence: 99%

“…1(a-c) for 40 Ca+ 40 Ca, 48 Ca+ 48 Ca, and 16 O+ 208 Pb systems, respectively. We observe that the Pauli exclusion principle (present only in DCFHF) induces a repulsion at short distance in the three systems.…”

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How the Pauli exclusion principle affects fusion of atomic nuclei

et al. 2017

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The Pauli exclusion principle induces a repulsion between composite systems of identical fermions such as colliding atomic nuclei. Our goal is to study how heavy-ion fusion is impacted by this "Pauli repulsion". We propose a new microscopic approach, the density-constrained frozen Hartree-Fock method, to compute the bare potential including the Pauli exclusion principle exactly. Pauli repulsion is shown to be important inside the barrier radius and increases with the charge product of the nuclei. Its main effect is to reduce tunnelling probability. Pauli repulsion is part of the solution to the long-standing deep sub-barrier fusion hindrance problem.Comment: 5 pages, 1 figur

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How the Pauli exclusion principle affects fusion of atomic nuclei

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“…The targets were 50µg/cm 2 evaporations of 28 Si onto 15µg/cm 2 carbon backings. The fusion-evaporation residues (ER) were separated from the beam by using the set-up based on an electrostatic deflector (see [10] and Refs. therein), which was systematically employed for sub-and near-barrier fusion measurements at LNL.…”

Section: Oscillations Above the Barriermentioning

confidence: 99%

Fusion of²⁸Si +²⁸Si: oscillations above the barrier and the behavior down to 1μb

Stefanini

Montagnoli

Corradi

et al. 2014

EPJ Web of Conferences

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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 28 Si + 28 Si, by measuring fusion cross sections (σ) in an energy range of 15 MeV above the barrier, with a small ∆E lab = 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.

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“…The influence of transfer on fusion was noticed in systems having a positive Q-value for neutron transfer channels [3][4][5][6][7][8][9]. However, in few recent work, in spite of positive Q-values, no effect of the transfer channel on fusion enhancement was observed [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of neutron transfer channels on fusion enhancement in sub-barrier region

et al. 2017

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Abstract. Fusion cross-section measurements were performed for system 40 Ca + 70 Zn around the Coulomb barrier energies using Heavy Ion Reaction Analyzer (HIRA). The observed enhancement in experimental fusion cross-sections was investigated via coupled-channels formalism. The coupling of inelastic excitations alone could not reproduce the experimental data, however, the effect of octupole state of the projectile was observed to be significant. The multi-neutron positive Q-value transfer channels were also included in the calculations using semi-classical model. It was observed that two neutrons pick-up channel gave a major contribution to the fusion enhancement and successfully reproduce the experimental data at above as well as below barrier energies. The coupling of more than two neutrons transfer could not give any significant enhancement to subbarrier fusion.

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Fusion of40Ca+40Caand otherCa+Casystems near and below the ba

Abstract: The fusion excitation function of 40 Ca + 40 Ca has been measured from well above the Coulomb barrier, down to low energies where the cross section is as small as ≃20 µb, and the astrophysical S factor possibly reaches a maximum vs. energy.

Cited by 117 publications

References 27 publications

How the Pauli exclusion principle affects fusion of atomic nuclei

How the Pauli exclusion principle affects fusion of atomic nuclei

Fusion of²⁸Si +²⁸Si: oscillations above the barrier and the behavior down to 1μb

Influence of neutron transfer channels on fusion enhancement in sub-barrier region

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Fusion of40Ca+40Caand otherCa+Casystems near and below the ba

Abstract: The fusion excitation function of 40 Ca + 40 Ca has been measured from well above the Coulomb barrier, down to low energies where the cross section is as small as ≃20 µb, and the astrophysical S factor possibly reaches a maximum vs. energy.

Cited by 117 publications

References 27 publications

How the Pauli exclusion principle affects fusion of atomic nuclei

How the Pauli exclusion principle affects fusion of atomic nuclei

Fusion of28Si +28Si: oscillations above the barrier and the behavior down to 1μb

Influence of neutron transfer channels on fusion enhancement in sub-barrier region

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Fusion of²⁸Si +²⁸Si: oscillations above the barrier and the behavior down to 1μb