Dominance of collective over proton transfer couplings in the fusion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>32</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>34</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:math>w

Mukherjee, A.; Dasgupta, M.; Hinde, David; Hagino, K.; Leigh, J.R.; Mein, J. C.; Morton, Clyde; Newton, J.O.; Timmers, H.

doi:10.1103/physrevc.66.034607

Cited by 49 publications

(41 citation statements)

References 26 publications

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“…We assume that the involved nuclei are prolate except for 12 C (β 0 = −0.32 from the multi-dimensionally constrained relativistic mean field model [105][106][107]), 27 Al, and 28 Si. In order to achieve a better agreement with the experiment, the ground state quadrupole deformation parameters of 194,198 Pt are taken from Ref. [108] and for 35 Cl, β 0 = 0.1 is used.…”

Section: Resultsmentioning

confidence: 99%

Systematics of capture and fusion dynamics in heavy-ion collisions

Wang

Wen

Zhao

et al. 2017

Atomic Data and Nuclear Data Tables

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We perform a systematic study of capture excitation functions by using an empirical coupled-channel model. In this model, a barrier distribution is used to take effectively into account the effects of couplings between the relative motion and intrinsic degrees of freedom. The shape of the barrier distribution is of an asymmetric Gaussian form. The effect of neutron transfer channels is also included in the barrier distribution. Based on the interaction potential between the projectile and the target, empirical formulas are proposed to determine the parameters of the barrier distribution.Theoretical estimates for barrier distributions and calculated capture cross sections together with experimental cross sections of 220 reaction systems with 182 Z P Z T 1640 are tabulated. The results show that our empirical formulas work quite well in the energy region around the Coulomb barrier. This model can provide prediction of capture cross sections for the synthesis of superheavy nuclei as well as valuable information on capture and fusion dynamics.

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Section: Resultsmentioning

confidence: 99%

Systematics of capture and fusion dynamics in heavy-ion collisions

Wang

Wen

Zhao

et al. 2017

Atomic Data and Nuclear Data Tables

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“…This reaction was chosen because it not only has a well-known fusion cross section measured previously, but there are also existing, reliable direct measurements of the angular distribution. These measurements, made by Mukherjee et al [1], were made possible by scanning in angle using a velocity filter, as detailed by Wei et al [16]. While more direct, measuring the angular distribution in this way is far more time-consuming, taking a number of days to collect enough counts for satistfactory statistics at all angles.…”

Section: Iterative Procedures To Deduce Angular Distributionmentioning

confidence: 99%

“…We have developed a method to deduce the angular distribution of the evaporation residues from the laboratory-frame velocity distribution σ exp (v l ) of the evaporation residues measured after the solenoid. The method will be discussed, focussing on the example of 34 S+ 89 Y, where the angular distribution has been independently measured using a velocity filter [1]. The establishment of this method now allows the novel solenoidal separator to be used to obtain the most reliable, precision fusion cross-sections.…”

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confidence: 99%

Determination of Precision Fusion Cross Sections Using a High Efficiency Superconducting Solenoidal Separator

et al. 2017

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Abstract. A novel fusion product separator based on a gas-filled superconducting solenoid has been developed at the Australian National University. Though the transmission efficiency of the solenoid is very high, precision cross sections measurements require this efficiency to be estimated accurately. A Monte Carlo simulation for the efficiency can be performed, but in turn requires knowledge of the angular distribution of the evaporation residues. We have developed a method to deduce the angular distribution of the evaporation residues from the laboratory-frame velocity distribution σ exp (v l ) of the evaporation residues measured after the solenoid. The method will be discussed, focussing on the example of 34 S+ 89 Y, where the angular distribution has been independently measured using a velocity filter [1]. The establishment of this method now allows the novel solenoidal separator to be used to obtain the most reliable, precision fusion cross-sections.

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“…It is apparent from The experimental results for the two lead systems are consistent with those reported from fusion measurements for the two reactions 32,36 S + 110 Pd [14], where additional barrier strength at low energies was also found for the lighter projectile 32 S. While the new data support an important role of positive Q-value neutron transfer channels in the fusion of 32 S + 208 Pb, such an interpretation is only unique, if the properties of the collective states in 32 S and 34 S are identical, or at least can be assumed to be very similar. Recent results for the fusion of the sulphur nuclei 32,34 S with 89 Y [15] show that in that case the different collectivity of their quadrupole excitations (Table 2) results in a broader fusion barrier distribution for 32 S than for 34 S. Thus the differences observed in this work between the barrier distributions for 32 S + 208 Pb and 34 S + 208 Pb may not be solely due to coupling to the positive Q-value neutron pick-up channels. Measurements for the heavier system 36 S + 208 Pb may shed additional light on the fusion mechanism.…”

Section: Discussion Of the Experimental Datamentioning

confidence: 99%

Investigation of the role of neutron transfer in the fusion of 32,34S with 197Au, 208Pb using quasi-elastic scattering

2002

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Excitation functions for quasi-elastic scattering have been measured at backward angles for the systems 32,34 S + 197 Au and 32,34 S + 208 Pb for energies spanning the Coulomb barrier. Representative distributions, sensitive to the low energy part of the fusion barrier distribution, have been extracted from the data. For the fusion reactions of 32,34 S with 197 Au couplings related to the nuclear structure of 197 Au appear to be dominant in shaping the low energy part of the barrier distribution. For the system 32 S + 208 Pb the barrier distribution is broader and extends further to lower energies, than in the case of 34 S + 208 Pb. This is consistent with the interpretation that the neutron pick-up channels are energetically more favoured in the 32 S induced reaction and therefore couple more strongly to the relative motion. It may also be due to the increased collectivity of 32 S, when compared with 34 S.

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Dominance of collective over proton transfer couplings in the fusion of32Sand34Sw

Cited by 49 publications

References 26 publications

Systematics of capture and fusion dynamics in heavy-ion collisions

Systematics of capture and fusion dynamics in heavy-ion collisions

Determination of Precision Fusion Cross Sections Using a High Efficiency Superconducting Solenoidal Separator

Investigation of the role of neutron transfer in the fusion of 32,34S with 197Au, 208Pb using quasi-elastic scattering

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