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Title: Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies

Abstract

The recent discovery of hindrance in heavy-ion induced fusion reactions at extreme sub-barrier energies represents a challenge for theoretical models. Previously, it has been shown that in medium-heavy systems, the onset of fusion hindrance depends strongly on the ''stiffness'' of the nuclei in the entrance channel. In this work, we explore its dependence on the total mass and the Q-value of the fusing systems and find that the fusion hindrance depends in a systematic way on the entrance channel properties over a wide range of systems.

Authors:
; ; ; ;  [1]
  1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20771210
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.73.014613; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; FLEXIBILITY; HEAVY ION FUSION REACTIONS; HEAVY NUCLEI; MASS; Q-VALUE

Citation Formats

Jiang, C.L., Back, B.B., Esbensen, H., Janssens, R.V.F., and Rehm, K.E. Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.014613.
Jiang, C.L., Back, B.B., Esbensen, H., Janssens, R.V.F., & Rehm, K.E. Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies. United States. doi:10.1103/PhysRevC.73.014613.
Jiang, C.L., Back, B.B., Esbensen, H., Janssens, R.V.F., and Rehm, K.E. Sun . "Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies". United States. doi:10.1103/PhysRevC.73.014613.
@article{osti_20771210,
title = {Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies},
author = {Jiang, C.L. and Back, B.B. and Esbensen, H. and Janssens, R.V.F. and Rehm, K.E.},
abstractNote = {The recent discovery of hindrance in heavy-ion induced fusion reactions at extreme sub-barrier energies represents a challenge for theoretical models. Previously, it has been shown that in medium-heavy systems, the onset of fusion hindrance depends strongly on the ''stiffness'' of the nuclei in the entrance channel. In this work, we explore its dependence on the total mass and the Q-value of the fusing systems and find that the fusion hindrance depends in a systematic way on the entrance channel properties over a wide range of systems.},
doi = {10.1103/PhysRevC.73.014613},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
  • The recent discovery of hindrance in heavy-ion induced fusion reactions at extreme sub-barrier energies represents a challenge for theoretical models. Previously, it has been shown that in medium-heavy systems, the onset of fusion hindrance depends strongly on the 'stiffness' of the nuclei in the entrance channel. In this work, we explore its dependence on the total mass and the Q-value of the fusing systems and find that the fusion hindrance depends in a systematic way on the entrance channel properties over a wide range of systems.
  • The excitation function for the fusion-evaporation reaction {sup 64}Ni+{sup 100}Mo has been measured down to a cross section of {approx}5 nb. Extensive coupled-channels calculations have been performed, which cannot reproduce the steep falloff of the excitation function at extreme sub-barrier energies. Thus, this system exhibits a hindrance for fusion, a phenomenon that has been discovered only recently. In the S-factor representation introduced to quantify the hindrance, a maximum is observed at E{sub s}=120.6 MeV, which corresponds to 90% of the reference energy E{sub s}{sup ref}, a value expected from systematics of closed-shell systems. A systematic analysis of Ni-induced fusion reactionsmore » leading to compound nuclei with mass A=100-200 is presented in order to explore a possible dependence of fusion hindrance on nuclear structure.« less
  • There are many new results in the study of the heavy-ion fusion hindrance phenomenon at extreme sub-barrier energies since Fusion03. Some of them have been published. Presented are some new results, including the first evidence in fusion hindrance for a system with small negative Q-value, 28Si + 64Ni, and the impact of fusion hindrance on reactions of interest to astrophysics.
  • There are many new results in the study of the heavy-ion fusion hindrance phenomenon at extreme sub-barrier energies since Fusion03. Some of them have been published. Presented are some new results, including the first evidence in fusion hindrance for a system with small negative Q-value, {sup 28}Si + {sup 64}Ni, and the impact of fusion hindrance on reactions of interest to astrophysics.
  • No abstract prepared.