Pair neutron transfer in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mtext>Ni</mml:mtext><mml:mprescripts /><mml:none /><mml:mn>60</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mspace width="0.16em" /><mml:mmultiscripts><mml:mtext>Sn</mml:mtext><mml:mprescripts /><mml:none /><mml:mn>116</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>probed via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-particle coincidences

Montanari, D.; Corradi, L.; Szilner, S.; Pollarolo, G.; Goasduff, A.; Mijatović, T.; Bazzacco, D.; Birkenbach, B.; Bracco, A.; Charles, L.; Courtin, S.; Désesquelles, P.; Fioretto, E.; Gadea, A.; Görgen, A.; Gottardo, A.; Grȩbosz, J.; Haas, F.; Hess, H.; Malenica, D. Jelavić; Jungclaus, A.; Karolak, M.; Leoni, S.; Maj, A.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Montagnoli, G.; Napoli, D. R.; Pullia, A.; Recchia, F.; Reiter, P.; Rosso, D.; Salsac, M. D.; Scarlassara, F.; Söderström, P.-A.; Soić, N.; Stefanini, A. M.; Stézowski, O.; Theisen, Ch.; Ur, C. A.; Valiente-Dobón, J. J.; Pajtler, Maja Varga

doi:10.1103/physrevc.93.054623

Cited by 27 publications

(33 citation statements)

References 24 publications

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“…Indeed, for small values of the coupling, P xn is proportional to (v 0 ) x which is consistent with the scaling deduced from the first non-zero term appearing in time-dependent perturbation theory (see appendix A). It is finally worth mentioning that the observed probability dependence with v 0 /g looks very much the same as the observed evolution of transfer probabilities below the Coulomb barrier when plotted as a function of the minimal distance of approach [9][10][11][12]. This underlines that the perturbative regime is certainly the most relevant for these experiments.…”

Section: A Exact Solutionsupporting

confidence: 77%

“…In the future, it would be interesting to compare the different approaches to describe multiple pair transfer to high-precision experiments. In recent years, several experiments have been performed for energies well below the Coulomb barrier [9][10][11][12] where the perturbative regime is relevant. However, these experiments involve targets different from the projectile where many effects other than pairing play a role in the transfer.…”

Section: Discussionmentioning

confidence: 99%

“…Such hierarchy is typically observed in reactions below the Coulomb barrier [9][10][11][12], which establishes an interesting range of applications.…”

Section: The Phase-space Combinatorial Technique (Psc)mentioning

confidence: 99%

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Microscopic description of pair transfer between two superfluid Fermi systems: Combining phase-space averaging and combinatorial techniques

et al. 2018

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In a mean-field description of superfluidity, particle number and gauge angle are treated as quasiclassical conjugated variables. This level of description was recently used to describe nuclear reactions around the Coulomb barrier. Important effects of the relative gauge angle between two identical superfluid nuclei (symmetric collisions) on transfer probabilities and fusion barrier have been uncovered. A theory making contact with experiments should at least average over different initial relative gauge-angles. In the present work, we propose a new approach to obtain the multiple pair transfer probabilities between superfluid systems. This method, called Phase-Space combinatorial (PSC) technique, relies both on phase-space averaging and combinatorial arguments to infer the full pair transfer probability distribution at the cost of multiple mean-field calculations only. After benchmarking this approach in a schematic model, we apply it to the collision 20 O+ 20 O at various energies below the Coulomb barrier. The predictions for one pair transfer are similar to results obtained with an approximated projection method whereas significant differences are found for two pairs transfer. Finally, we investigated the applicability of the PSC method to the contact between non-identical superfluid systems. A generalization of the method is proposed and applied to the schematic model showing that the pair transfer probabilities are reasonably reproduced. The applicability of the PSC method to asymmetric nuclear collisions is investigated for the 14 O+ 20 O collision and it turns out that unrealistically small single-and multiple-pair transfer probabilities are obtained. This is explained by the fact that relative gauge angle play in this case a minor role in the particle transfer process compared to other mechanisms such as equilibration of the charge/mass ratio. We conclude that the best ground for probing gauge-angle effects in nuclear reaction and/or for applying the proposed PSC approach on pair transfer is the collisions of identical open-shell spherical nuclei.

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Section: A Exact Solutionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

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Microscopic description of pair transfer between two superfluid Fermi systems: Combining phase-space averaging and combinatorial techniques

et al. 2018

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“…One of the topics of current interest that would benefit from such a machinery is the question of the role played by the nuclear superfluidity in the transfer and fusion channels of heavy-ion collisions at sub-Coulomb barrier energies. Recently, a number of experimental investigations have been made to study the competition between deep sub-barrier fusion and transfer channels [8][9][10][11]. These experimental investigations are made in parallel with numerous theoretical works (see for instance the recent review of Ref.…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of pair transfer between two superfluid Fermi systems. II. Quantum mixing of time-dependent Hartree-Fock-Bogolyubov trajectories

Regnier

Lacroix

2019

Phys. Rev. C

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While superfluidity is accurately grasped with a state that explicitly breaks the particle number symmetry, a precise description of phenomena like the particle transfer during heavy-ion reactions can only be achieved by considering systems with good particle numbers. We investigate the possibility to restore particle number in many-body dynamical problems by mixing-up several Time-Dependent Hartree-Fock Bogolyubov (TDHFB) trajectories. In our approach, each trajectory is independent from the others and the quantum mixing between trajectories is deduced from a variational principle. The associated theory can be seen as a simplified version of the Multi-Configuration TDHFB (MC-TDHFB) theory. Its accuracy to tackle the problem of symmetry restoration in dynamical problems is illustrated for the case of two superfluid systems that exchange particles during a short time. In Ref. [Phys. Rev. C 97, 034627 (2018)], using a schematic model where two systems initially described by a pairing Hamiltonians are coupled during a short contact time, it was demonstrated that statistical mixing of TDHFB trajectories can only qualitatively describe the transfer process and that a fully quantum treatment is mandatory. We show here that the present MC-TDHFB approach gives an excellent agreement with the exact solution when the two superfluids are the same (symmetric case) or different (asymmetric case) and from weak to strong interaction strength. Finally, we discuss the benefits and bottleneck of this method in view of its application to realistic systems.

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“…Recent experiments have supported this hypothesis, delivering hints that two colliding nuclei could be described as a Josephson junction in which entangled neutron pairs play the role of Cooper pairs ( Fig. 1) [2,3]. Now, Gregory Potel from Lawrence Livermore National Laboratory in California and colleagues have put these ideas on firmer ground [4].…”

mentioning

confidence: 99%