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The <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0013.gif" overflow="scroll"><mml:mi mathvariant="normal">β</mml:mi><mml:mi mathvariant="normal">-</mml:mi><mml:mi>decay</mml:mi></mml:math> Paul trap: A radiofrequency-quadrupole ion trap for precision <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0014.gif" overflow="scroll"><mml:mi mathvariant="normal">β</mml:mi><mml:mi mathvariant="normal">-</mml:mi><mml:mi>decay</mml:mi></mml:math> studies