Experimental investigation of 16O + 12C nuclear burning at stellar energies

Patterson, J. R.; Nagorcka, B.N.; Symons, G.D.; Zuk, W.M.

doi:10.1016/0375-9474(71)90469-6

Cited by 83 publications

(22 citation statements)

References 17 publications

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“…The data show a rise in the S-factor at the lowest energies, which might indicate the existence of a broad resonance in the entrance channel, possibly related to an intermediate state in the compound nucleus [22]. Similar broad resonances in the S-factor at energies below the barrier have been also inferred from the 12 C+ 16 O total cross sections [23]. Thus, the S-factor is a quantity that magnifies structures in the excitation function at energies below the barrier, and it is also an instrument for exploring the inner part of the barrier in low-energy, heavy-ion fusion reactions.…”

Section: Representations Of Low-energy Cross Sectionssupporting

confidence: 72%

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Signature of shallow potentials in deep sub-barrier fusion reactions

2007

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We extend a recent study that explained the steep falloff in the fusion cross section at energies far below the Coulomb barrier for the symmetric dinuclear system 64 Ni+ 64 Ni to another symmetric system, 58 Ni+ 58 Ni, and the asymmetric system 64 Ni+ 100 Mo. In this scheme the very sensitive dependence of the internal part of the nuclear potential on the nuclear equation of state determines a reduction of the classically allowed region for overlapping configurations and consequently a decrease in the fusion cross sections at bombarding energies far below the barrier. Within the coupled-channels method, including couplings to the low-lying 2 + and 3 − states in both target and projectile as well as mutual and two-phonon excitations of these states, we calculate and compare with the experimental fusion cross sections, S-factors, and logarithmic derivatives for the above mentioned systems and find good agreement with the data even at the lowest energies. We predict, in particular, a distinct double peaking in the S-factor for the far subbarrier fusion of 58 Ni+ 58 Ni which should be tested experimentally.

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Section: Representations Of Low-energy Cross Sectionssupporting

confidence: 72%

“…As shown in Ref. [23], the S-factor exhibits a sequence of quasi-molecular resonances, sandwiched between a limiting interior threshold and the Coulomb barrier. In the present case we obtain a maximum that is too broad to be assigned to a resonance, the curvature in the S-factor being explained by the shallow pocket in the potential.…”

Section: Ni+ 58 Nimentioning

confidence: 74%

Signature of shallow potentials in deep sub-barrier fusion reactions

2007

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“…At this point one should recall the experience gained in the sixties on molecular resonances. As shown in [33] the S factor exhibits a sequence of quasimolecular resonances for lighter systems. The curve with small dashes is the Winther-Akyüz potential used in [1][2][3][4][5].…”

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confidence: 87%

Hindrance of Heavy-Ion Fusion due to Nuclear Incompressibility

2006

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We propose a new mechanism to explain the unexpected steep falloff of fusion cross sections at energies far below the Coulomb barrier. The saturation properties of nuclear matter are causing a hindrance to large overlap of the reacting nuclei and consequently a sensitive change of the nuclear potential inside the barrier. We report in this Letter a good agreement with the data of coupled-channels calculation for the 64Ni + 64Ni combination using the double-folding potential with Michigan-3-Yukawa-Reid effective N - N forces supplemented with a repulsive core that reproduces the nuclear incompressibility for total overlap.

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“…Focusing on the C+C systems, it becomes clear that the resonance structure appears only in the 12 C+ 12 C case; the systems 12 C+ 13 C and 13 C+ 13 C The data for systems in (a) -(d) are taken from references [3][4][5][6][7], [17,18], [19,20] and [16,21,22], respectively.…”

Section: C+mentioning

confidence: 99%