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Project List » FUNDAMENTAL PHENOMENA FROM NUCLEAR ASTRO-PHYSICS,STUDIED WITH CAPTURE REACTION AND LIFETIMES,WITH ALPHA PARTICLES OF LOW ENERGIES INTERPRETED BY CALCULATIONS WITH OPTICAL MODEL AND COUPLED CHANNEL |
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FUNDAMENTAL PHENOMENA FROM NUCLEAR ASTRO-PHYSICS,STUDIED WITH CAPTURE REACTION AND LIFETIMES,WITH ALPHA PARTICLES OF LOW ENERGIES INTERPRETED BY CALCULATIONS WITH OPTICAL MODEL AND COUPLED CHANNEL
www.nipne.ro/proiecte/pn2/48-projects.html
Acronym: ID_362
Contracting Authority: Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI)
Number / Date of the contract: 48 / 28.09.2007
Idei
Project Manager: IRINA CATA-DANIL
Partners:
Starting date / finishing date: 2007-09-28 / 2010-09-15
Project value: 1000000 RON
Abstract: THE PROJECT AIMS TO OBTAIN ORIGINAL THEORETICAL AND EXPERIMETAL INFORMATION IN A VERY ACTUAL FIELD OF STUDY. THE TWO MECANISMS THAT LEAD TO FORMATION OF MOST STABLE NUCLEI HEAVIER THAN IRON ARE GENERALLY DESCRIBED BY TWO PROCESSES: CAPTURE OF SLOW NETRONS(S-PROCESS) AND CAPTURE OF FAST NEUTRONS(R-PROCESS). A THIRD PROCESS, P-PROCESS IS INVOLVED IN THE CREATION OF THE 35 PROTON-REACH STABLE NUCLEI. THE ABOUNDANCES OF THESE NUCLEI IS TIPICALLY ONLY A FRACTION OF THE TOTAL ISOTOPIC ABUNDACE. THESE P-NUCLEI, BETWEEN SE AND HG, ARE SUROUNDED BY STABLE NUCLEI FORMED BY S AND R PROCESSES. HUNDREDS OR EVEN THOUNSADS OF REACTION CROSS-SECTIONS,INVOLVING BOTH STABLE AND PROTON-RICH UNSBLE NUCLEI, ARE NEEDED FOR A PRECISE DESCRIPTION OF THE NUCLEOSINTHESIS OF P-TYPE NUCLEI, BUT NO SYSTEMATIC EFORT IN THIS FIELD WAS PREVIOUSLY ATTEMPTED. MOST OF THE NEEDED CROSS-SECTIONS INVOLVE VERY DIFFICULT DIRECT MEASUREMENTS OF GAMA INDUCED REACTIONS. A MORE FEASIBLE APPROACH IS TO MEASURE THE CROSS-SECTIONS OF THE NUCLEI PRODUCED IN INVERSE PARTICLE INDUCED REACTIONS, AND THEN OBTAIN THE PHOTODESINTEGRATION CROSS-SECTUION BY APPLYING THE DETAILED EQUILIBRIUM PRINCIPLE, ASSUMING THAT ALL THE INVOLVED NUCLEI ARE IN THERMODYNAMIC EQUILIBRIUM. THE PURPOSE OF THIS PROJECT IS TO MEASURE THE CAPTURE CROSS-SECTIONS 115SN(ALPHA,GAMMA)119TE AND 117SN(ALPHA,GAMMA)121TE REACTIONS USING AN ACTIVATION TECHNIQUE. THE ENERGY RANGE CONSIDERED FOR THESE MEASUREMENTS IS BETWEEN 9MEV AND 16MEV. THE ACTIVATION TECHNIQUE IMPLIES THE BOMBARDING OF A TARGET WITH THE PURPOSE OF CREATING A SUFICIENTLY LONG LIVED NUCLEUS THAT CAN BE MEASURED AFTER THE IRADIATION END.
Objectives:
THE STAGES OF THE PROJECT AND DELIVERY DATES
1. (2007-11-30)
2. (2008-05-30)
3. (2008-11-30)
4. (2009-05-30)
5. (2009-11-30)
6. (2010-09-15)
RESULTS
PUBLISHED ARTICLES
RESEARCH TEAM
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