Doppler Shift Study of Gamma-Rays from the Reaction 82(se Li,xny)

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Addis Ababa University


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



Doppler Shift Study