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  von Oertzen, W.; Peter, I.; Thummerer, S.; Bohlen, H.G.; Gebauer, B.; Gerl, J.; Kaspar, M.; Kozhoukharov, I.; Kröll, T.; Rejmund, M.; Wollersheim, H.J.: Selection of cold transfer and enhanced neutron-pair transfer in the ²⁰⁶Pb+¹¹⁸Sn reaction. European Physical Journal A 20 (2004), p. 153-156

10.1140/epja/i2002-10342-y

Abstract:
The neutron transfer in a very heavy asymmetric nuclear system, in ²⁰⁶Pb+¹¹⁸Sn has been measured using Particle-γ coincidence techniques with position sensitive detectors, 5 Euroball-Cluster detectors (EB) and the Heidelberg-Darmstadt NaI-Crystal Ball (CB). The fragments are identified via the known γ-decays of the lowest excited states using the high resolution of EB. Using the unique feature of the set-up with the CB, transfer to well defined final channels with known quantum numbers are selected using the high efficiency multiplicity filter of the CB with {\it no} second γ-ray, i.e. without feeding. The enhancement in the two-neutron transfer is deduced, for population of the low lying super-fluid 2⁺ states in ¹²⁰Sn and ¹¹⁶Sn while the 2n-transition remains in the ground state for the recoiling ^20XPb-nuclei. Large enhancements up to EF~eq10³ are observed. This is the first observation of neutron pair-transfer enhancement for a heavy nuclear binary system with super-fluid properties with experimentally separated levels.