First structure information on the exotic 149 La from the \(\beta^-\)-decay of 149 Ba
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The \(\beta^-\)-decay of 149Ba to 149La has been investigated by means of \(\gamma\)- and X-ray spectroscopy, and a partial level scheme of 149La has been constructed for the first time. It includes thirteen \(\gamma\)-rays and ten excited states. The exotic 149La is the heaviest lanthanum for which spectroscopic information is now available. We have applied the shell correction approach with the axially deformed Woods-Saxon potential in order to calculate the deformation energy for the 149La ground state. The deformed ground state was found at \(\beta_2 \simeq\) 0.23, \(\beta_3 \simeq\) 0 and \(\beta_4 \simeq\) 0.12.
KeywordsSpectroscopy Excited State Lanthanum Structure Information Level Scheme
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