transfer- and fragmentation reactions near fermi-energy production of exotic nuclei

TRANSFER- AND FRAGMENTATION REACTIONS NEAR FERMI-ENERGY

Production of Exotic nucleiProduction of Exotic nuclei

Supervisors

A.G. Artyukh

B. Erdemchimeg

Presented By

S.P. Bvumbi

H.W. Groenewald

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The who, what and where…The who, what and where…

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MotivationMotivation

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• Reaction mechanism – Transfer and Fragmentation reactions through deep inelastic scattering

• Production of radioactive beams

• Can be applied to heavier nuclei to maybe reach island of stability

MotivationMotivation

1111BB2727AlAl

88LiLi

3030P (?)P (?)

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• A projectile nucleus traveling with energy near Fermi-energy has same velocity as nucleons moving inside target nucleus

• “Cold” fragments – All products have a small excitation energy

• Initial and final velocity of projectile / beam will be approximately equal

• Fermi-energy ≈ 37 MeV

Why near Fermi-energy?Why near Fermi-energy?

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КОМплекс Быстродействующего Анализатора Спектрометра

COMBAS / КОМБАСCOMBAS / КОМБАС

COMplex (B)High-speed Analysing Spectrometer

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COMBAS / КОМБАСCOMBAS / КОМБАС

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COMBAS / КОМБАСCOMBAS / КОМБАС

thin targetprimary beam

E ~ a few MeV/A

E ~ a few MeV/A

TOF – Time Of Flight

B - magnetic rigidityB – vector of magnetic field - radius of particle trajectory

degrader dE – energy losses

start stopdetectors

BB11 < B< B22<< BB33

BB11

BB22

BB33

B - magnetic rigidityB =M/q

if const then B ~ M/q

because M=A, q=Z B ~ A/Z

if v = constthen A/Z (6He) = A/Z (9Li) = 3

the same trajectory for the same B !!

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Data AnalysisData Analysis

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Data Analysis – Lise++Data Analysis – Lise++

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Data Analysis – Lise++Data Analysis – Lise++

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Data AnalysisData Analysis

66LiLi

77LiLi

88LiLi

99BeBe

1010BeBe

44HeHe

66HeHe

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Data AnalysisData Analysis

66LiLi2+2+

88LiLi2+2+77LiLi3+3+

77LiLi2+2+66LiLi3+3+

88LiLi3+3+

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Data AnalysisData Analysis

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ResultsResults

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ResultsResults

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• COMBAS successful in separating isotopes with identical Bρ

• Isotope identification was successful due to LISE++ simulations (For higher values of Bρ)

• Estimations of Relative Yields for the isotopes were calculated

• Can be applied in the use of exotic radioactive beams

• Creation of nuclei in Island of Stability may be possible!

ConclusionsConclusions

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