<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>β</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mi>At</mml:mi> <mml

The energy states and electromagnetic transitions of even-even <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mmultiscripts> <a:mi>Po</a:mi> <a:mprescripts/> <a:none/> <a:mrow> <a:mn>202</a:mn> <a:mo>−</a:mo> <a:mn>206</a:mn> </a:mrow> </a:mmultiscripts> </a:math> and odd-mass <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> <b:mmultiscripts> <b:mi>Po</b:mi> <b:mprescripts/> <b:none/> <b:mrow> <b:mn>203</b:mn> <b:mo>,</b:mo> <b:mn>205</b:mn> </b:mrow> </b:mmultiscripts> </b:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mmultiscripts> <c:mi>At</c:mi> <c:mprescripts/> <c:none/> <c:mrow> <c:mn>203</c:mn> <c:mo>,</c:mo> <c:mn>205</c:mn> </c:mrow> </c:mmultiscripts> </c:math> isotopes within the framework of the proton-neutron interacting boson model (IBM-2) and its extension (IBFM-2) are calculated. For odd- <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"> <d:mi>A</d:mi> </d:math> nuclei, the <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"> <e:mrow> <e:mn>0</e:mn> <e:msub> <e:mi>h</e:mi> <e:mrow> <e:mn>9</e:mn> <e:mo>/</e:mo> <e:mn>2</e:mn> </e:mrow> </e:msub> <e:mo>,</e:mo> <e:mn>1</e:mn> <e:msub> <e:mi>f</e:mi> <e:mrow> <e:mn>7</e:mn> <e:mo>/</e:mo> <e:mn>2</e:mn> </e:mrow> </e:msub> <e:mo>,</e:mo> <e:mn>1</e:mn> <e:msub> <e:mi>f</e:mi> <e:mrow> <e:mn>5</e:mn> <e:mo>/</e:mo> <e:mn>2</e:mn> </e:mrow> </e:msub> <e:mo>,</e:mo> <e:mn>2</e:mn> <e:msub> <e:mi>p</e:mi> <e:mrow> <e:mn>3</e:mn> <e:mo>/</e:mo> <e:mn>2</e:mn> </e:mrow> </e:msub> <e:mo>,</e:mo> <e:mn>2</e:mn> <e:msub> <e:mi>p</e:mi> <e:mrow> <e:mn>1</e:mn> <e:mo>/</e:mo> <e:mn>2</e:mn> </e:mrow> </e:msub> </e:mrow> </e:math> and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"> <f:mrow> <f:mn>0</f:mn> <f:msub> <f:mi>i</f:mi> <f:mrow> <f:mn>13</f:mn> <f:mo>/</f:mo> <f:mn>2</f:mn> </f:mrow> </f:msub> </f:mrow> </f:math> single-particle orbits are considered as model space. The obtained results are used to assign spins to some uncertain spin states. The <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"> <g:mrow> <g:mi>log</g:mi> <g:mi>f</g:mi> <g:mi>t</g:mi> </g:mrow> </g:math> values of the allowed <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"> <h:mi>β</h:mi> </h:math> decay are calculated using the model wave function and compared with available experimental values.