Evidence for oscillating two-neutron transfer probabilities at large radial separation in heavy-ion reactions

Wu, C. Y.; Xt, Liu; Kernan, W.J.; Cline, D.; Czosnyka, T.; Guidry, Mike; Kavka, A.E.; Kincaid, R.W.; Kotliński, B.; Sp, Sorensen; Vogt, E.G.

doi:10.1103/physrevc.39.298

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…In some cases the integrated cross sections were not indicated by the authors and had to be obtained using the published angular distributions and extrapolating the latter where necessary. This was done using transfer probability plots, a much practised exercise in the recent literature; for recent examples, see [46,57,58]. The symbols in the figure distinguish whether the light partner nucleus is the donor or the acceptor.…”

Section: Quasielastic Transfer Channels: Reflection From a Barrier Inmentioning

confidence: 99%

Competition between binary reactions and fusion in heavy-ion collisions at the Coulomb barrier

Reisdorf¹,

Kratz

Bellwied

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Mass and charge distributions for binary reaction channels have been measured for the reactions 86Kr with 76Ge, I~ and 13~ at the Coulomb barrier using chemical separations and 7-ray spectroscopy. These systems span the region where dynamical hindrance to complete fusion sets in. The binary reactions can be subdivided into two components associated with i) reflection from the outer potential barrier (quasielastic), and ii) reseparation after passing the barrier (complex reactions). The sum of complex-reaction channels and evaporation residues from complete fusion can be reproduced by a barrier passing calculation. The fraction of the barrier passing flux leading to reseparation increases from 26 +_ 10% for the lightest system to more than 90% for the heaviest system. The data indicate that fusion hindrance is primarily caused by reseparation shortly after passage of the barrier before Swiatecki's conditional saddlepoint is overcome, resulting in partitions close to the entrance channel configuration. In addition, for the heaviest system, a quasifission component representing somewhat less than 20% of the barrier-passing flux was observed. From the missing masses of fragment pairs we can deduce that the reseparating complex-reaction products have kinetic energies well below the fusion barrier and share the excitation energy in a way similar to the sawtooth-like curve known from low-energy fission. The quasielastic, predominantly one-and two-nucleon transfer channels, have strongly varying cross sections for the three systems despite similar effective Q-values. A systematics of one-neutron transfer cross sections at the Coulomb barrier is established and shown to differ considerably from the smooth behaviour observed at energies 20-30% above the barri- er. The connection to nuclear polarization phenomena and orbit matching is pointed out.

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Section: Quasielastic Transfer Channels: Reflection From a Barrier Inmentioning

confidence: 99%

Competition between binary reactions and fusion in heavy-ion collisions at the Coulomb barrier

Reisdorf¹,

Kratz

Bellwied

et al. 1992

Z. Physik A - Hadrons and Nuclei

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“…In more recent studies of lighter systems, in which reactions of 58Ni and 116Sn projectiles with Dy targets [3,4] were investigated, similar small radial slopes of the transfer probability were observed. According to those authors the observed behavior in their systems is due to a critical dependence of the slope on the angular momentum to the states excited in the transfer process, rather than to intrinsic excitations of the reaction fragments.…”

Section: Introductionmentioning

confidence: 57%

“…In [3,4] the measured slope was explained by a critical dependence on the angular momenta of the states excited in the transfer process, rather than intrinsic excitations of the collision partners.…”

Section: Comparison With a Barrier Penetration Model With Sharp Potenmentioning

confidence: 81%

Inelastic scattering and nucleon transfer in the system232Th+206Pb near the Coulomb barrier

Eckert

Stelzer

Nelson

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Nucleon transfer accompanied by Coulomb excitation was studied in the system 2~ at EL~b=6.4 MeV/u. Particle-particle-gamma coincidence techniques were used to identify excited states of reaction products populated through inelastic scattering and nucleon transfer reactions. The mean excitation energy was measured by means of a y-ray energy and multiplicity filter consisting of 6 NaI detectors. Large cross sections for one-neutron and two-neutron pick-up from 232Th are observed. The impact-parameter dependence of the neutron transfer is analyzed in terms of semiclassical barrier penetration models. Using realistic neutron potentials with a diffuse surface, the experimental data are in accordance with the assumption of a "cold" transfer to states near the yrast line.

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A kinematic-coincidence detector system for sub-barrier heavy-ion reaction studies

Devlin

Cline

et al. 1995

Nuclear Instruments and Methods in Physics Research Section A:

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Evidence for oscillating two-neutron transfer probabilities at large radial separation in heavy-ion reactions

Cited by 13 publications

References 11 publications

Competition between binary reactions and fusion in heavy-ion collisions at the Coulomb barrier

Competition between binary reactions and fusion in heavy-ion collisions at the Coulomb barrier

Inelastic scattering and nucleon transfer in the system232Th+206Pb near the Coulomb barrier

A kinematic-coincidence detector system for sub-barrier heavy-ion reaction studies

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