Precision mass measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Zn</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>61</mml:mn> </mml:mmultiscripts> </mml:math> and updated <mml:math xmlns:mml="http:

We report a high-precision mass measurement of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mmultiscripts> <a:mi>Zn</a:mi> <a:mprescripts/> <a:none/> <a:mn>61</a:mn> </a:mmultiscripts> </a:math> , performed with the ISOLTRAP mass spectrometer at ISOLDE, CERN. Our result agrees with a recent measurement from the LEBIT Penning trap at FRIB and reduces the mass uncertainty by a factor of four. Combined with recent measurements of the mirror nuclide <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> <b:mmultiscripts> <b:mi>Ga</b:mi> <b:mprescripts/> <b:none/> <b:mn>61</b:mn> </b:mmultiscripts> </b:math> performed by TITAN at TRIUMF and CSRe at HIRFL, we obtain a more accurate <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mi>Q</c:mi> </c:math> value. This new value slightly improves the determination of the corresponding <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"> <d:mrow> <d:mi mathvariant="script">F</d:mi> <d:mi>t</d:mi> </d:mrow> </d:math> value in the <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"> <f:mrow> <f:msub> <f:mi>T</f:mi> <f:mi>z</f:mi> </f:msub> <f:mo>=</f:mo> <f:mn>1</f:mn> <f:mo>/</f:mo> <f:mn>2</f:mn> </f:mrow> </f:math> mirror beta decays used to test the conserved vector current hypothesis in the standard model.