Evolution of fusion hindrance for asymmetric systems at deep sub-barrier energies

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• 作者：A. Shrivastava^a ; ^b ; ^{aradhana@barc.gov.in" class="auth_mail" title="E-mail the corresponding author} ; K. Mahata^a ; ^b ; S.K. Pandit^a ; ^b ; V. Nanal^c ; T. Ichikawa^d ; K. Hagino^e ; A. Navin^f ; C.S. Palshetkar^a ; V.V. Parkar^a ; K. Ramachandran^a ; ^b ; P.C. Rout^a ; ^b ; Abhinav Kumar^a ; A. Chatterjee^a ; S. Kailas^a
• 关键词：Fusion cross sections ; Deep sub-barrier energies ; Coupled channels calculations ; Adiabatic model
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 April 2016
• 年：2016
• 卷：755
• 期：Complete
• 页码：332-336
• 全文大小：397 K

文摘

Measurements of fusion cross-sections of ⁷Li and ¹²C with ¹⁹⁸Pt at deep sub-barrier energies are reported to unravel the role of the entrance channel in the occurrence of fusion hindrance. The onset of fusion hindrance has been clearly observed in ${}^{12}\mathrm{C}+{}^{198}\mathrm{Pt}$ system but not in ${}^7\mathrm{Li}+{}^{198}\mathrm{Pt}$ system, within the measured energy range. Emergence of the hindrance, moving from lighter (^6,7Li) to heavier (¹²C, ¹⁶O) projectiles is explained employing a model that considers a gradual transition from a sudden to adiabatic regime at low energies. The model calculation reveals a weak effect of the damping of coupling to collective motion for the present systems as compared to that obtained for systems with heavier projectiles.