Solitonic excitations in collisions of superfluid nuclei a qualitatively new phenomenon distinct from the Josephson effect

Kazuyuki Sekizawa,Piotr Magierski,Gabriel Wlazłowski,E.C Simpson,C Simenel,K.J Cook,I.P Carter

doi:10.1051/epjconf/201716300051

Kazuyuki Sekizawa, Piotr Magierski + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201716300051

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Abstract

Recently, we have reported a novel role of pairing in low-energy heavy ion reactions at energies above the Coulomb barrier, which may have a detectable impact on reaction outcomes, such as the kinetic energy of fragments and the fusion cross section [arXiv:1611.10261, arXiv:1702.00069]. The phenomenon mimics the one studied experimentally with ultracold atomic gases, where two clouds of fermionic superfluids with different phases of the pairing fields are forced to merge, inducing various excitation modes of the pairing field. Although it originates from the phase difference of the pairing fields, the physics behind it is markedly different from the so-called Josephson effect. In this short contribution, we will briefly outline the results discussed in our recent papers and explain relations with the field of ultracold atomic gases.

Highlights

Almost 60 years have passed after the seminal work by A
In our recent papers [24, 25], we have extended the application of TDSLDA to low-energy heavy ion reactions, employing FaNDF0 nuclear functional [26, 27] without spin-orbit coupling, and found a qualitatively new phenomenon associated with the pairing field dynamics in collisions of two superfluid nuclei
In our recent papers [24, 25], we have reported a qualitatively new phenomenon in low-energy heavy ion reactions at energies above the Coulomb barrier, which is associated with relative phase difference of the pairing fields of colliding superfluid nuclei

Summary

Introduction

Almost 60 years have passed after the seminal work by A. In our recent papers [24, 25], we have extended the application of TDSLDA to low-energy heavy ion reactions, employing FaNDF0 nuclear functional [26, 27] without spin-orbit coupling, and found a qualitatively new phenomenon associated with the pairing field dynamics in collisions of two superfluid nuclei. It has been shown that the solitonic structure is relatively long-lived object that stays until the composite system splits Because of this fact, the solitonic excitation effectively hinders energy dissipation from translational motion to internal degrees of freedom as well as the neck formation, resulting in dramatic changes of the reaction dynamics As we feel that it would be useful to clarify the distinct character of the effect we studied, as compared to the Josephson effect, we explain this point in detail

Solitonic excitation vs Josephson effect

Summary