Quantum entanglement in nuclear Cooper pair tunneling with $\gamma$-rays

Abstract

While Josephson-like junctions, transiently established in heavy ion collisions (${\tau }_{coll}\approx 10^{-21}$ s) between superfluid nuclei --through which Cooper pair tunneling ($Q$-value $Q_{2n}$) proceeds mainly in terms of successive transfer of entangled nucleons-- is deprived from the macroscopic aspects of a supercurrent, it displays many of the special effects associated with spontaneous symmetry breaking in gauge space (BCS condensation), which can be studied in terms of individual quantum states and of tunneling of single Cooper pairs. From the results of studies of one- and two- neutron transfer reactions carried out at energies below the Coulomb barrier we estimate the value of the mean square radius (correlation length) of the nuclear Cooper pair. A quantity related to the largest distance of closest approach for which the absolute two-nucleon tunneling cross section is of the order of the single-particle one. Furthermore, emission of $\gamma$-rays of (Josephson) frequency ${\nu }_J=Q_{2n}/h$ distributed over an energy range $\hslash /{\tau }_{coll}$ is predicted.

References in corpus (2)

• Neutron spectroscopic factors of Ni isotopes from transfer reactions
• From bare to renormalized order parameter in gauge space: structure and reactions

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• Material matters in superconducting qubits
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• Six-$\alpha$ cluster Bose-Einstein condensation and supersolid ${}^{12}$C($0_2^{+})$+${}^{12}$C($0_2^{+})$ molecular structure in ${}^{24}$Mg
• Probable observation of the nuclear Cooper pair mean square radius in superfluid nuclei