Doppler Shift Study of Gamma-Rays from the Reaction 82(se Li,xny)
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Date
1995-06
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Addis Ababa University
Abstract
If hea\y ions react with nuclei, they can be excited to high spin states. This excitation then
usual\~' is followed by an emission of a few nucleons and ganuna-ravs. The gamma-lines
Ii'om this hea\.y-ion nuclear reaction undergo Doppler shiH because the nuclei produced in
the reaction experience a recoil which is capable of incurring a shift on the lines. To study
this reature of gamma lines, which is often done in hea\·y-ion gatmna-ray works. especially
in lltctime measurements of nuclear excited states. an analysis of ganuna-spectra hom the
readion SlSe ( - Li ,xn'{ ) measured at 35'" 31', 90°, I·n° and 1450 with respect to the beam
( , ( '{ "( ( [ , ( ,
direction has been done. The energy or t\1e, "I.i :ion :b('dill uSIOd, w .. ", 3.5' Me\(. ,Hoth the
("c, ( '" ({ '-:: '" '''' ;". ''''. '
analysis energies and intensities of the' gan·,mi\-lraHsiti')n~ '.i!'eobtaiiied; TIie' 90° spc<,trum
\\hieh has no Doppler shift to the [U'st order of ap'pi'oXirildtioa 'if, lls,ed:a~'a r"terence t~ lind
out the shifted lines. \!any lines "hich Ita", ;I shift in'au'intw;al Lelween: Ike'" anl! ~.5
ke" are found. A re"lew of literature on related topics such as the application of Doppkr
shift in lif'Ctime measurement and the de,Cliption of single particle shell model and collective
llIodel to describe nudear transition probabilities are included
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Keywords
Doppler Shift Study