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Project List » FUSION REACTIONS AT EXTREM SUB_BARRIER ENERGIES

FUSION REACTIONS AT EXTREM SUB_BARRIER ENERGIES
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Acronym: FUSBAR
Contracting Authority: Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI)
Number / Date of the contract: ID-049 / 28.09.2007
Idei
Project Manager: Serban Misicu
Partners:
Starting date / finishing date: 2007-09-15 / 2010-06-01
Project value: 1000000 RON
Abstract: HEAVY-ION FUSION IS CLASSICAL FORBIDDEN UNDER THE COULOMB BARRIER. HOWEVER, DUE TO QUANTUM TUNNELING THIS PROCESS CAN TAKE PLACE WITH FINITE PROBABILITY. THIS PHENOMENON DEPENDS ON THE COLLIDING ENERGY OF THE PROJECTILE-TARGET SYSTEM, THE NUCLEAR MATTER DISTRIBUTION IS ESSENTIAL IN DETERMINING THE SHAPE OF THE POTENTIAL AND OF THE CAPTURE RATES. A GOOD UNDERSTANDING OF THE MECHANISM UNDERLYING THIS QUANTUM PHENOMENON IS ALSO IMPORTANT IN THE CASE OF NUCLEAR REACTIONS TAKING PLACE IN EXOTIC CONDITIONS SUCH AS FUSION OF C AND O IN STELLAR BURNING PROCESSES TAKING PLACE AT ENERGIES DEEP UNDER THE BARRIER OR THE SYNTHESIS PROCESS OF SUPERHEAVY NUCLEI THAT CAN BE FAVORED AT LOW EXCITATION ENERGIES. THUS, THE FUSION PROCESSES UNDER THE COULOMB BARRIER ARE VERY IMPORTANT IN EXPLAINING SOME MODERN PROBLEMS OF LOW-ENERGY NUCLEAR PHYSICS AND CONSEQURNTLY WE INTEND TO FOCCUS ON THE FOLLOWING TOPICS: 1. INVESTIGATION OF THE HEAVY-ION POTENTIAL SHAPE INSIDE THE COULOMB BARRIER, AN ESSENTIAL ASPECT IN NUCLEAR REACTIONS THAT INVOLVES QUANTUM TUNNELING , THE SHAPE OF NUCLEAR MATTER DISTRIBUTION IN THE NEIGHBORHOOD OF THE NUCLEAR SURFACE AND RELATED TO THAT THE PROBING OF THE EQUATION OF STATE FOR SYMMETRIC AND ASYMMETRIC NUCLEAR MATTER. 2.ANALYSE OF THE FUSION EXCITATION FUNCTION UNDER THE COULOMB BARRIER WITHIN THE FRAME OF THE COUPLED-CHANNELS METHOD AND INCLUDING THE ROTATIONAL AND VIBRATIONAL COLLECTIVE EXCITATION AND THE NEUTRON TRANSFERWITH APPLICATIONS TO THE FUSION OF LIGHT SPHERICAL NUCLEI SUCH AS 16O WITH HEAVY NUCLEI. 3. SYNTHESIS OF HEAVY AND SUPERHEAVY NUCLEI WITH EXOTIC NUCLEI. 4. INFLUENCE OF THE SUB-BARRIER FUSION OF THE LIGHT NUCLEI 12C AND 16O ON THE EVOLUTION PROCESS OF MASSIVE STARS.

Objectives:

THE STAGES OF THE PROJECT AND DELIVERY DATES
1. Investigation of Extreme Sub-Barrier Fusion with Medium-Heavy Spherical Nuclei  (2007-12-20)
2. Calculation of the Nuclear Potential in the case of Sub-Barrier Fusion . Density dependent effective n-n forces and improved treatment of the exchange term. Treatment of the rearrangement term based on nuclear matter calculations. (2008-11-30)
3. Extreme sub-barrier fusion of 12C and 16O for energies in the astrophysical range. Resonant structures in cross-section for sub-barrier energies nuclear reactions of astrophysical interest (2009-06-01)
4. Analysis of extreme sub-barrier fusion with light and halo projectiles on heavy targets and the synthesis of heavy and superheavy nuclei (2009-11-01)
5. Influence of the sub-barrier fusion hindrance on the stellar burning processes nuclosynthesis (2010-05-01)
RESULTS
PUBLISHED ARTICLES
RESEARCH TEAM


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