Systematic behavior of one- and two-nucleon transfer reactions induced by medium-weight projectiles

Rehm, K. E.; Beck, Christian; Berg, A. van den; Kovar, D. G.; Lee, L.L.; Ma, W.C.; Videbæk, F.; Wang, T.F.

doi:10.1103/physrevc.42.2497

Cited by 29 publications

(26 citation statements)

References 31 publications

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“…As shown in Fig. 7, this agrees reasonably well with the 'sum of spectroscopic factors' obtained recently by Rehm and coworkers [18]. Such a dependence is rather weak, if one leaves out the lightest masses (A < 10).…”

Section: Complex Reaction Channels: Excitation Energy Sharingsupporting

confidence: 88%

“…This will be discussed in detail later. For quasi-elastic transfer, Qgg is known to be an important parameter [16][17][18]. Also, for dissipative multi-nucleon transfer reactions, the role of the potential energy surface which depends on Qgg has been demonstrated [19], most clearly at bombarding energies close to the barrier.…”

Section: N(g--n)mentioning

confidence: 98%

“…What comes to mind is either a nuclear structure effect associated with the single-particle orbits that carry most of the spectroscopic strength, or a dynamic influence connected with the necessity to match in-and out-going orbits in such one-step reactions [45]. Recent compilations [17,18] of one-neutron transfer cross sections measured in heavy ion reactions induced some 20 to 30% above the barrier energy fit surprisingly well into a smooth systematics if care is taken to remove the influence of the available Qvalue window and of the neutron binding energy (i. e. the tailing of the single-particle wavefunctions). Following [17] we have plotted in Fig.…”

Section: Quasielastic Transfer Channels: Reflection From a Barrier Inmentioning

confidence: 99%

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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: Complex Reaction Channels: Excitation Energy Sharingsupporting

confidence: 88%

Section: N(g--n)mentioning

confidence: 98%

Section: Quasielastic Transfer Channels: Reflection From a Barrier Inmentioning

confidence: 99%

See 1 more Smart Citation

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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“…The scaling factors that are used are motivated by the systematics of transfer reactions that was observed in Ref. [18]. The basic observation was that the Q value distribution for transfer reactions is a Gaussian that is centered at the optimum Q value, which is of the order of +1 MeV.…”

Section: Coupled-channels Calculationsmentioning

confidence: 99%

Revised analysis ofCa40+Zr96fusion reactions

2016

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Fusion data for 40 Ca+ 96 Zr are analyzed by coupled-channels calculations that are based on a standard Woods-Saxon potential and include couplings to multiphonon excitations and transfer channels. The couplings to multiphonon excitations are the same as used in a previous work. The transfer couplings are calibrated to reproduce the measured neutron transfer data. This type of calculation gives a poor fit to the fusion data. However, by multiplying the transfer couplings with a √ 2 one obtains an excellent fit. The scaling of the transfer strengths is supposed to simulate the combined effect of neutron and proton transfer, and the calculated one-and two-nucleon transfer cross sections are indeed in reasonable agreement with the measured cross sections.

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“…For a quantitative estimate of fission yields from the 232 Th( 15 C, 14 C) (Q=3.57 MeV) reaction we have used the systematics of neutron transfer obtained from reactions with stable beams in nearby systems [28,29]. The location and the width of the Q-window was calculated with the DWBA program PTOLEMY [30].…”

Section: Transfer-induced Fissionmentioning

confidence: 99%

Fusion reactions with the one-neutron halo nucleus¹⁵C

Alcorta

Rehm

Back

et al. 2011

EPJ Web of Conferences

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Systematic behavior of one- and two-nucleon transfer reactions induced by medium-weight projectiles

Cited by 29 publications

References 31 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

Revised analysis ofCa40+Zr96fusion reactions

Fusion reactions with the one-neutron halo nucleus¹⁵C

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Systematic behavior of one- and two-nucleon transfer reactions induced by medium-weight projectiles

Cited by 29 publications

References 31 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

Revised analysis ofCa40+Zr96fusion reactions

Fusion reactions with the one-neutron halo nucleus15C

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Product

Resources

About

Fusion reactions with the one-neutron halo nucleus¹⁵C