On the interpretation of evaporation residue mass distributions in heavy-ion induced fusion reactions

Pühlhofer, F.

doi:10.1016/0375-9474(77)90308-6

Cited by 1,025 publications

(319 citation statements)

References 26 publications

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“…Typically, particle transmission coefficients are not discussed in great detail in the compiled works. The level-density models are either the Pühlhofer model [39] (the default in the statistical-model code CASCADE [39]) or the Reisdorf model [40]. The Pühlhofer model relies on the local Dilg et al parameterization [41] for excitation energies up to and slightly above the nucleon separation energy, while it interpolates then to a regime where the level-density parameter a becomes proportional to the nuclear mass number A.…”

Section: Statistical-model Calculations and Comparison To Experimentamentioning

confidence: 99%

Compilation of giant electric dipole resonances built on excited states

Schiller

Thoennessen

2007

Atomic Data and Nuclear Data Tables

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Section: Statistical-model Calculations and Comparison To Experimentamentioning

confidence: 99%

Compilation of giant electric dipole resonances built on excited states

Schiller

Thoennessen

2007

Atomic Data and Nuclear Data Tables

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“…Several publications have focused on the production of neutron-deficient compound nuclei (CN) with Z = 83-87 [1][2][3][4][5] and comparisons of the experimental data with model calculations. Various models [6][7][8][9][10][11][12][13] have been proposed to reproduce EvR cross sections by adjusting parameters such as the fission barrier height or including phenomena such as collective enhancements [14] and fission dissipation [15]; however, there is still no consensus on how to best reproduce the experimental data. Andreyev et al produced neutron-deficient isotopes of Bi [1], Po [1], and At [2] and observed significant contributions from pxn evaporation channels that competed effectively with the xn channels.…”

Section: Introductionmentioning

confidence: 99%

Hot fusion-evaporation cross sections ofSc45-induced reactions with lanthanide targets

et al. 2015

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Background: 45 Sc has rarely been studied as a projectile in fusion-evaporation reactions. The synthesis of new superheavy elements with Z > 118 will require projectiles with Z > 20, and 45 Sc could potentially be used for this purpose.Purpose: Cross sections were measured for the xn and pxn exit channels in the reactions of 45 Sc with lanthanide targets for comparison to previous measurements of 48 Ca reacting with similar targets. These data provide insight on the survival of spherical, shell-stabilized nuclei against fission, and could have implications for the discovery of new superheavy elements. Methods:Beams of 45 Sc 6+ were delivered from the K500 superconducting cyclotron at Texas A&M University with an energy of ≈5 MeV/nucleon. Products were purified using the Momentum Achromat Recoil Spectrometer, and excitation functions were measured for reactions of 160 Gd, 159 Tb, and 162 Dy at five or more energies each. Evaporation residues were identified by their characteristic α-decay energies. Experimental data were compared to a simple theoretical model to study each step in the fusion-evaporation process. 2.4 + − , and 1.8 ± 0.6 μb, respectively. Proton emission competes effectively with neutron emission from the excited compound nucleus in most cases. The α, αn, and α2n products were also observed in the 45 Sc + 162 Dy reaction.Conclusions: Excitation functions were reported for 45 Sc-induced reactions on lanthanide targets for the first time, and these cross sections are much smaller than for 48 Ca-induced reactions on the same targets. The relative neutron-deficiency of the compound nuclei leads to significantly increased fissility and large reductions in the survival probability. Little evidence for improved production cross sections due to shell-stabilization was observed. PACS number(s): 25.70.Gh, 25.70.Jj

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“…in each case. The codes that will be considered here are PACE2 [3], LILITA [20,21] and CASCADE [6,22]. (It is worth mentioning that two mistakes were discovered and corrected in the neutron optical-model potential parameters appearing in the PACE2 source code: a).-The coefficient of the E 2 term in V was 0.0018, corrected to 0.00118 (see [23], [24]).…”

Section: Absolute Normalization Of Datamentioning

confidence: 99%

“…[2]), evaporation alpha particles rather than protons were measured and fusion cross sections were deduced using the evaporation code CASCADE ( [6]). The multiplicity issue that was favourable for the 8 B + 58 Ni system becomes a liability in this case because the respective alpha-particle multiplicity is low (M α ∼ 0.5).…”

Section: Introductionmentioning

confidence: 99%

Above-barrier fusion enhancement of proton-halo systems

et al. 2016

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Previously reported data for fusion of the 8 B + ( 58 Ni, 28 Si) systems are critically reviewed. New α particle data from the fusion of 8 B + 58 Ni also are reported, but the paper is mostly based on using realistic calculations of well established codes to reanalyze the previous data. The influence of breakup protons on the evaporation proton measurements for the heavier system is found to be small at all energies except for the lowest one measured, and corrections are made for this process. Possible model dependencies in the deduced fusion cross sections are investigated using three different evaporation codes. The data sets for the 58 Ni and 28 Si targets are shown to be consistent with each other and with fusion enhancement up to energies that are greater than the Coulomb barrier V b (E c.m. < ∼ V b + 1.5×hω). This limit corresponds to 6.2 MeV above the barrier for the 58 Ni target. An important difference with the behaviour of neutron-halo systems is thus confirmed.PACS numbers: 25.60. Pj ,

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On the interpretation of evaporation residue mass distributions in heavy-ion induced fusion reactions

Cited by 1,025 publications

References 26 publications

Compilation of giant electric dipole resonances built on excited states

Compilation of giant electric dipole resonances built on excited states

Hot fusion-evaporation cross sections ofSc45-induced reactions with lanthanide targets

Above-barrier fusion enhancement of proton-halo systems

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