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- W2725704462 abstract "Background: Near- and sub-barrier fusion of various Ca + Zr isotopic combinations have been widely investigated. A recent analysis of $^{40}mathrm{Ca}+^{96}mathrm{Zr}$ data has highlighted the importance of couplings to multiphonon excitations and to both neutron and proton transfer channels. Analogous studies of $^{40}mathrm{Ca}+^{90}mathrm{Zr}$ tend to exclude any role of transfer couplings. However, the lowest measured cross section for this system is rather high ($840phantom{rule{4pt}{0ex}}ensuremath{mu}mathrm{b}$). A rather complete data set is available for $^{40}mathrm{Ca}+^{94}mathrm{Zr}$, while no measurement of $^{40}mathrm{Ca}+^{92}mathrm{Zr}$ fusion has been performed in the past.Purpose: Our aim is to measure the full excitation function of $^{40}mathrm{Ca}+^{92}mathrm{Zr}$ near the barrier and to extend downward the existing data on $^{40}mathrm{Ca}+^{90}mathrm{Zr}$, in order to estimate the transfer couplings that should be used in coupled-channels calculations of the fusion of these two systems and of $^{40}mathrm{Ca}+^{94}mathrm{Zr}$.Methods: $^{40}mathrm{Ca}$ beams from the XTU Tandem accelerator of INFN--Laboratori Nazionali di Legnaro were used, bombarding thin metallic $^{90}mathrm{Zr}$ ($50phantom{rule{4pt}{0ex}}ensuremath{mu}mathrm{g}/{mathrm{cm}}^{2}$) and ${^{92}mathrm{ZrO}}_{2}$ targets (same thickness) enriched to $99.36%$ and $98.06%$ in masses 90 and 92, respectively. An electrostatic beam deflector allowed the detection of fusion evaporation residues (ER) at very forward angles, and angular distributions of ER were measured.Results: The excitation function of $^{40}mathrm{Ca}+^{92}mathrm{Zr}$ has been measured down to the level of $ensuremath{simeq}60phantom{rule{4pt}{0ex}}ensuremath{mu}mathrm{b}$. Coupled-channels (CC) calculations using a standard Woods-Saxon (WS) potential and following the line of a previous analysis of $^{40}mathrm{Ca}+^{96}mathrm{Zr}$ fusion data give a good account of the new data, as well as of the existing data for $^{40}mathrm{Ca}+^{94}mathrm{Zr}$. The previous excitation function of $^{40}mathrm{Ca}+^{90}mathrm{Zr}$ has been extended down to $40phantom{rule{4pt}{0ex}}ensuremath{mu}mathrm{b}$.Conclusions: Transfer couplings play an important role in explaining the fusion data for $^{40}mathrm{Ca}+^{92}mathrm{Zr}$ and $^{40}mathrm{Ca}+^{94}mathrm{Zr}$. The strength of the pair-transfer coupling is deduced by applying a simple recipe based on the value obtained for $^{40}mathrm{Ca}+^{96}mathrm{Zr}$. The logarithmic slopes and the $S$ factors for fusion are reproduced fairly well for all three systems by the CC calculations, and there are no indications of a fusion hindrance at the lowest energies. In contrast, the new data for $^{40}mathrm{Ca}+^{90}mathrm{Zr}$ indicate the onset of a fusion hindrance at the lowest energies." @default.
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- W2725704462 date "2017-07-07" @default.
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- W2725704462 title "New results in low-energy fusion of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mmultiscripts><mml:mi mathvariant=bold>Ca</mml:mi><mml:mprescripts /><mml:none /><mml:mn>40</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant=bold>Zr</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>90</mml:mn><mml:mo>,</mml:mo><mml:mn>92</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>" @default.
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- W2725704462 doi "https://doi.org/10.1103/physrevc.96.014603" @default.
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