Neutron Pair Transfer inNi60+Sn116Far below the Coulom

Abstract

An excitation function of one- and two-neutron transfer channels for the ^{60}Ni+^{116}Sn system has been measured with the magnetic spectrometer PRISMA in a wide energy range, from the Coulomb barrier to far below it. The experimental transfer probabilities are well reproduced, for the first time with heavy ions, in absolute values and in slope by microscopic calculations which incorporate nucleon-nucleon pairing correlations.

Selective properties of neutron transfer reactions in the 90Zr + 208Pb system for the population of excited states in zirconium isotopes

“…The excitation of the intrinsic degrees of freedom is obtained by employing the well-known form factors for the collective surface vibrations and one-particle transfer channels. The experimental constant drop of neutron pick-up channels, suggesting an independent particle transfer mechanism, has been well reproduced by calculations (see also [1,[18][19][20][21]). This good agreement between theory and experiment corroborate the fact that the included degrees of freedom describe well the reaction.…”

“…The segmentation of the anode into 40 rectangular sub-anodes allows to optimize the gas pressure in order to get the best nuclear charge resolution. The described detector system gives all the necessary information for the complete ion identification, which is performed via an event-by-event reconstruction of the trajectory inside the magnetic elements [16,22]. In this reconstruction, the ion trajectories after the quadrupole are assumed to be planar, as a consequence of the fact that the longitudinal dimension of PRISMA is much larger then the transversal one.…”

Multinucleon transfer reactions in the Ar40+Pb208 system

“…In the quasi-elastic regime the mass and charge distributions of transfer products are governed by optimum Q-value considerations and transfer form factors. For nuclei close to the stability line, these optimum Q-value arguments favor the neutron pick-up and the proton stripping channels (pick-up and stripping are referring to the lighter reaction fragment) [5][6][7][8][9]. This is the reason why multinucleon transfer reactions have recently been used as a competitive tool for the production of neutron-rich nuclei in the vicinity of the light partner (see for example Refs.…”

Strong Neutron Pairing in core+4n Nuclei

“…Pairing correlations also imply a smoothing of the level occupancy around the Fermi energy surface and an enhancement of pair transfer probabilities (see, e.g., Refs. [2,3]), as well as a superfluid behavior in nuclear rotation [4] and vibration [5]. When moving from the interior to the surface of the neutron-rich nuclei 11 Li [6], 8 He and…”