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Project List » Synthesis and stability of superheavy nuclei

Synthesis and stability of superheavy nuclei
proiecte.nipne.ro/pn2/42-projects.html


Acronym: SINS
Contracting Authority: Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI)
Number / Date of the contract: 160 / 14.09.2007
Idei
Project Manager: Radu Alexandru Gherghescu
Partners:
Starting date / finishing date: 2007-10-01 / 2010-09-30
Project value: 1000000 RON
Abstract: THE MAIN GOAL OF THE PROJECT IS THE DEVELOPMENT OF A THEORETICAL METHOD ABLE TO CHARACTERIZE THE NUCLEAR FUSION AND FISSION PHENOMENA AND APPLICABLE TO THE SYNTHESIS AND DECAY OF SUPERHEAVY NUCLEI. THE TOPIC IS ONE OF THE HOTEST IN THE NUCLEAR RESEARCH LABORATORIES BOTH THEORETICAL AND EXPERIMENTAL. RECENTLY THE NEWLY SYNTHESIZED SUPERHEAVY NUCLEUS Z=110 WAS NAMED DARMSTADTIUM (DS), AND NEW SEARCHES ARE UNDERWAY FOR THE EXTENSION OF THIS NUCLEAR REGION. IN ORDER TO EXPLAIN THE STABILITY OF SUPERHEAVY NUCLEI AS WELL AS TO FIND THE MOST FAVORABLE FUSION CHANNELS, A SPECIALIZED MODEL IS COMPULSORY CAPABLE TO DESCRIBE THE BINARY PHENOMENA OF SYNTHESIS AND DECAY FOR THESE SYSTEMS. THE PROPOSED PROJECT STARTS FROM THE MOST COMPLEX TWO CENTER SHELL MODEL, DEVELOPED BY THE AUTHORS OF THIS PROPOSAL. ONE AIMS TO STUDY THE STATICS AND DYNAMICS OF THE SYNTHESIS AND DECAY PROCESSES BY APPLYTING A TARGETED BINARY MACROSCOPIC-MICROSCOPIC METHOD. THE DEFORMED TWO-CENTER SHELL MODEL SHALL GENERATE THE PROTONIC AND NEUTRONIC SINGLE PARTICLE LEVELS NECESSARY TO CALCULATE THE SHELL AND PAIRING CORRECTIONS. THE MACROSCOPIC PART WILL BE OBTAINED BY THE LIQUID DROP MODEL WITHIN THE YUKAWA+EXPONENTIAL POTENTIALS. THE DYNAMICS OF THE PROCESS WILL BE SETTLED BY INTRODUCING THE TENSOR OF INERTIA WITHIN THE BINARY CRANKING METHOD, WHICH SHALL BE DEVELOPED IN THIS PROJECT USING FOR THE FIRST TIME THE TWO-CENTER MICROSCOPIC POTENTIAL AND THE ADAPTED BCS THEORY FOR THE PAIRING EFFECTS. THE MULTIDIMENSIONAL MINIMIZATION OF THE ACTION INTEGRAL WILL PRIVIDE THE OPTIMAL FUSION AND FISSION TRAJECTORY FOR ALL POSSIBLE TARGET-PROJECTILE PAIRS TOWARDS THE SYNTHESIS OF A GIVEN SUPERHEAVY NUCLEUS. THE ALGORITHM WILL BE REPEATED FOR A LARGE RANGE OF ATOMIC NUMBERS BETWEEN Z=108 AND 130. THE CALCULATED PAIRS PROVIDING THE LARGEST PENETRABILITY VALUES SHALL BE SUGGESTED TO EXPERIMENTALISTS FOR THE BEST SYNTHESIS REACTION CHANNELS.

Objectives:

THE STAGES OF THE PROJECT AND DELIVERY DATES
1. Macroscopic deformation energy for binary fusion shapes (2007-02-15)
2. Level schemes, charge density variation and total deformation energy in target-projectile configuration (2008-10-31)
3. Inertia tensor, action integral minimization, penetrabilities and fusion cross sections. (2009-12-15)
4. Necking microscopic potential, action integral for fission and lifetimes for superheavy nuclei. (2010-09-15)
RESULTS
PUBLISHED ARTICLES
RESEARCH TEAM


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