Oscillations above the barrier in the fusion of 28 Si + 28 Si

Montagnoli, G.; Stefanini, A. M.; Esbensen, H.; Corradi, L.; Courtin, S.; Fioretto, E.; Grebosz, J.; Haas, F.; Jia, H. M.; Jiang, C. L.; Mazzocco, M.; Michelagnoli, C.; Mijatović, T.; Montanari, D.; Parascandolo, C.; Scarlassara, F.; Strano, E.; Szilner, S.; Torresi, D.

doi:10.1016/j.physletb.2015.05.021

Title: Oscillations above the barrier in the fusion of 28 Si + 28 Si

Journal Article · Mon Jun 01 00:00:00 EDT 2015 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2015.05.021· OSTI ID:1392415

Montagnoli, G.; Stefanini, A. M.; Esbensen, H.; Corradi, L.; Courtin, S.; Fioretto, E.; Grebosz, J.; Haas, F.; Jia, H. M.; Jiang, C. L.; Mazzocco, M.; Michelagnoli, C.; Mijatović, T.; Montanari, D.; Parascandolo, C.; Scarlassara, F.; Strano, E.; Szilner, S.; Torresi, D.

Fusion cross sections of Si-28 + Si-28 have been measured in a range above the barrier with a very small energy step (Delta E-lab = 0.5 MeV). Regular oscillations have been observed, best evidenced in the first derivative of the energy-weighted excitation function. For the first time, quite different behaviors (the appearance of oscillations and the trend of sub-barrier cross sections) have been reproduced within the same theoretical frame, i.e., the coupled-channel model using the shallow M3Y + repulsion potential. The calculations suggest that channel couplings play an important role in the appearance of the oscillations, and that the simple relation between a peak in the derivative of the energy-weighted cross section and the height of a centrifugal barrier is lost, and so is the interpretation of the second derivative of the excitation function as a barrier distribution for this system, at energies above the Coulomb barrier.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Croatian Science Foundation; USDOE Office of Science - Office of Nuclear Physics; European Commission - Community Research and Development Information Service (CORDIS) - Seventh Framework Programme (FP7)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392415

Journal Information:: Physics Letters B, Vol. 746, Issue C; ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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Systematic investigations of deep sub-barrier fusion reactions using an adiabatic approach Ichikawa, Takatoshi Physical Review C, Vol. 92, Issue 6 https://doi.org/10.1103/physrevc.92.064604	journal	December 2015
Association of molecular resonances with the oscillatory structures in nucleus–nucleus fusion cross section and its energy-weighted derivatives Sahu, Basudeb Journal of Physics G: Nuclear and Particle Physics, Vol. 46, Issue 11 https://doi.org/10.1088/1361-6471/ab4101	journal	October 2019
Recent experimental results in sub- and near-barrier heavy-ion fusion reactions Montagnoli, Giovanna; Stefanini, Alberto M. The European Physical Journal A, Vol. 53, Issue 8 https://doi.org/10.1140/epja/i2017-12350-2	journal	August 2017
Systematic investigations of deep sub-barrier fusion reactions using an adiabatic approach Ichikawa, Takatoshi arXiv https://doi.org/10.48550/arxiv.1510.00806	text	January 2015

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