Mirror Symmetry Up to the Band Termination in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>49</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Mn</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>49</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Cr</mml:mi></mml:math>

High-spin states have been investigated in the mirror pair nuclei ${}^{49}\mathrm{Cr}$ ( $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}24$, $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}25$) and ${}^{49}\mathrm{Mn}$ $(Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}25,N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}24)$. Mirror symmetry up to the band termination at about 10.7 MeV has been established. A comparison of the corresponding energy levels of the pair shows, for the first time, that the Coulomb energy difference approaches zero as the band termination is approached. This is explained intuitively in terms of a pure ${f}_{\frac{7}{2}}$ shell framework. For ${}^{49}\mathrm{Cr}$, excellent agreement is found between the data and recent full $\mathrm{pf}$-shell calculations.

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