Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
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A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The an id="mmlsi1" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si1.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=3e8d6adf32ae6893e5a1f420ed8ca958">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si1.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">01+ath>an>an>an>, an id="mmlsi2" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si2.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=5b97f0f3fafd4b39f6e23bbc7130e681">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si2.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">21+ath>an>an>an> and an id="mmlsi3" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si3.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=6a73bef336671d668075caec9f321760">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si3.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si3.gif" overflow="scroll">22+ath>an>an>an> transitions of an id="mmlsi4" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si4.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=c34b03801f7ec0e33a08a1f178821773" title="Click to view the MathML source">0νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">0νββath>an>an>an> decay were evaluated in an exposure of an id="mmlsi30" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si30.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=5c1df6e57827ed2dd26b0eb128d9b4a8">ass="imgLazyJSB inlineImage" height="15" width="73" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si30.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si30.gif" overflow="scroll">89.5ext> ext>ext>kgext>ace width="0.2em">ace>&sdot;ace width="0.2em">ace>ext>yrext>ath>an>an>an> of 136Xe, while the same transitions of an id="mmlsi6" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si6.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=8574a6a94c3e4ca037946834f4fa28bc" title="Click to view the MathML source">2νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si6.gif" overflow="scroll">2νββath>an>an>an> decay were evaluated in an exposure of an id="mmlsi7" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si7.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=0e05e261d4e72ae276048dd21e7785bc">ass="imgLazyJSB inlineImage" height="14" width="73" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si7.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si7.gif" overflow="scroll">61.8ext> ext>ext>kgext>ace width="0.2em">ace>&sdot;ace width="0.2em">ace>ext>yrext>ath>an>an>an>. No excess over background was found for all decay modes. The lower half-life limits of the an id="mmlsi2" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si2.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=5b97f0f3fafd4b39f6e23bbc7130e681">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si2.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">21+ath>an>an>an> state transitions of an id="mmlsi4" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si4.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=c34b03801f7ec0e33a08a1f178821773" title="Click to view the MathML source">0νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">0νββath>an>an>an> and an id="mmlsi6" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si6.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=8574a6a94c3e4ca037946834f4fa28bc" title="Click to view the MathML source">2νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si6.gif" overflow="scroll">2νββath>an>an>an> decay were improved to an id="mmlsi8" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si8.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=b4628e9c36c110e1d9be96e29619f686">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si8.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si8.gif" overflow="scroll">T1etchy="false">/20νetchy="false">(0+etchy="false">&rarr;21+etchy="false">)>2.6&times;1025ext> ext>ext>yrext>ath>an>an>an> and an id="mmlsi9" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si9.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=541315f08115814b9a20f573d91a9a21">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si9.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si9.gif" overflow="scroll">T1etchy="false">/22νetchy="false">(0+etchy="false">&rarr;21+etchy="false">)>4.6&times;1023ext> ext>ext>yrext>ath>an>an>an> (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the an id="mmlsi1" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si1.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=3e8d6adf32ae6893e5a1f420ed8ca958">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si1.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">01+ath>an>an>an> state of 136Xe for an id="mmlsi4" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si4.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=c34b03801f7ec0e33a08a1f178821773" title="Click to view the MathML source">0νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">0νββath>an>an>an> and an id="mmlsi6" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si6.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=8574a6a94c3e4ca037946834f4fa28bc" title="Click to view the MathML source">2νββan>an class="mathContainer hidden">an class="mathCode">ath altimg="si6.gif" overflow="scroll">2νββath>an>an>an> decay. They are an id="mmlsi10" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si10.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=efcf6db719ddb553bb9b9bf3dd9da351">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si10.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si10.gif" overflow="scroll">T1etchy="false">/20νetchy="false">(0+etchy="false">&rarr;01+etchy="false">)>2.4&times;1025ext> ext>ext>yrext>ath>an>an>an> and an id="mmlsi11" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si11.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=1fbdfb4dc5e17b92608c9c4257c54408">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si11.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si11.gif" overflow="scroll">T1etchy="false">/22νetchy="false">(0+etchy="false">&rarr;01+etchy="false">)>8.3&times;1023ext> ext>ext>yrext>ath>an>an>an> (90% C.L.). The transitions to the an id="mmlsi3" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si3.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=6a73bef336671d668075caec9f321760">ass="imgLazyJSB inlineImage" height="19" width="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si3.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si3.gif" overflow="scroll">22+ath>an>an>an> states are also evaluated for the first time to be an id="mmlsi12" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si12.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=a9ff1e7c94aed29982a846cb279bcc0d">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si12.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si12.gif" overflow="scroll">T1etchy="false">/20νetchy="false">(0+etchy="false">&rarr;22+etchy="false">)>2.6&times;1025ext> ext>ext>yrext>ath>an>an>an> and an id="mmlsi13" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037594741500278X&_mathId=si13.gif&_user=111111111&_pii=S037594741500278X&_rdoc=1&_issn=03759474&md5=c5eaebf4982e5ae29f08c69c415c182d">ass="imgLazyJSB inlineImage" height="23" width="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si13.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si13.gif" overflow="scroll">T1etchy="false">/22νetchy="false">(0+etchy="false">&rarr;22+etchy="false">)>9.0&times;1023ext> ext>ext>yrext>ath>an>an>an> (90% C.L.). These results are compared to recent theoretical predictions.

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