Oscillations above the barrier in the fusion of 28Si + 28Si
Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (ΔElab=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 behavior...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2015-06-01
|
| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315003585 |
| _version_ | 1818188444927524864 |
|---|---|
| author | G. Montagnoli A.M. Stefanini H. Esbensen L. Corradi S. Courtin E. Fioretto J. Grebosz F. Haas H.M. Jia C.L. Jiang M. Mazzocco C. Michelagnoli T. Mijatović D. Montanari C. Parascandolo F. Scarlassara E. Strano S. Szilner D. Torresi |
| author_facet | G. Montagnoli A.M. Stefanini H. Esbensen L. Corradi S. Courtin E. Fioretto J. Grebosz F. Haas H.M. Jia C.L. Jiang M. Mazzocco C. Michelagnoli T. Mijatović D. Montanari C. Parascandolo F. Scarlassara E. Strano S. Szilner D. Torresi |
| author_sort | G. Montagnoli |
| collection | DOAJ |
| description | Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (ΔElab=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. Keywords: Heavy-ion fusion, Sub-barrier cross sections, Coupled-channels model |
| first_indexed | 2024-12-11T23:27:02Z |
| format | Article |
| id | doaj.art-94cf894e3da34971bdca7a621b2e11f7 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-11T23:27:02Z |
| publishDate | 2015-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-94cf894e3da34971bdca7a621b2e11f72022-12-22T00:46:09ZengElsevierPhysics Letters B0370-26932015-06-01746300304Oscillations above the barrier in the fusion of 28Si + 28SiG. Montagnoli0A.M. Stefanini1H. Esbensen2L. Corradi3S. Courtin4E. Fioretto5J. Grebosz6F. Haas7H.M. Jia8C.L. Jiang9M. Mazzocco10C. Michelagnoli11T. Mijatović12D. Montanari13C. Parascandolo14F. Scarlassara15E. Strano16S. Szilner17D. Torresi18Dipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, Italy; Corresponding author.INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), ItalyPhysics Division, Argonne National Laboratory, Argonne, IL 60439, USAINFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), ItalyIPHC, CNRS-IN2P3, Université de Strasbourg, F-67037 Strasbourg Cedex 2, FranceINFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), ItalyInstitute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Cracow, PolandIPHC, CNRS-IN2P3, Université de Strasbourg, F-67037 Strasbourg Cedex 2, FranceINFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), ItalyPhysics Division, Argonne National Laboratory, Argonne, IL 60439, USADipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyRuđer Bošković Institute, HR-10002 Zagreb, CroatiaDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyRuđer Bošković Institute, HR-10002 Zagreb, CroatiaDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131 Padova, ItalyFusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (ΔElab=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. Keywords: Heavy-ion fusion, Sub-barrier cross sections, Coupled-channels modelhttp://www.sciencedirect.com/science/article/pii/S0370269315003585 |
| spellingShingle | G. Montagnoli A.M. Stefanini H. Esbensen L. Corradi S. Courtin E. Fioretto J. Grebosz F. Haas H.M. Jia C.L. Jiang M. Mazzocco C. Michelagnoli T. Mijatović D. Montanari C. Parascandolo F. Scarlassara E. Strano S. Szilner D. Torresi Oscillations above the barrier in the fusion of 28Si + 28Si Physics Letters B |
| title | Oscillations above the barrier in the fusion of 28Si + 28Si |
| title_full | Oscillations above the barrier in the fusion of 28Si + 28Si |
| title_fullStr | Oscillations above the barrier in the fusion of 28Si + 28Si |
| title_full_unstemmed | Oscillations above the barrier in the fusion of 28Si + 28Si |
| title_short | Oscillations above the barrier in the fusion of 28Si + 28Si |
| title_sort | oscillations above the barrier in the fusion of 28si 28si |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315003585 |
| work_keys_str_mv | AT gmontagnoli oscillationsabovethebarrierinthefusionof28si28si AT amstefanini oscillationsabovethebarrierinthefusionof28si28si AT hesbensen oscillationsabovethebarrierinthefusionof28si28si AT lcorradi oscillationsabovethebarrierinthefusionof28si28si AT scourtin oscillationsabovethebarrierinthefusionof28si28si AT efioretto oscillationsabovethebarrierinthefusionof28si28si AT jgrebosz oscillationsabovethebarrierinthefusionof28si28si AT fhaas oscillationsabovethebarrierinthefusionof28si28si AT hmjia oscillationsabovethebarrierinthefusionof28si28si AT cljiang oscillationsabovethebarrierinthefusionof28si28si AT mmazzocco oscillationsabovethebarrierinthefusionof28si28si AT cmichelagnoli oscillationsabovethebarrierinthefusionof28si28si AT tmijatovic oscillationsabovethebarrierinthefusionof28si28si AT dmontanari oscillationsabovethebarrierinthefusionof28si28si AT cparascandolo oscillationsabovethebarrierinthefusionof28si28si AT fscarlassara oscillationsabovethebarrierinthefusionof28si28si AT estrano oscillationsabovethebarrierinthefusionof28si28si AT sszilner oscillationsabovethebarrierinthefusionof28si28si AT dtorresi oscillationsabovethebarrierinthefusionof28si28si |