Search for double-beta decay of <sup>136sup>Xe to excited states of <sup>136sup>Ba with the KamLAND-Zen experiment

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• 作者：K. Asakura<sup>asup> ; A. Gando<sup>asup><sup> ; sup><sup>azusa@awa.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding authorsup> ; Y. Gando<sup>asup> ; T. Hachiya<sup>asup> ; S. Hayashida<sup>asup> ; H. Ikeda<sup>asup> ; K. Inoue<sup>asup><sup> ; sup><sup>bsup> ; K. Ishidoshiro<sup>asup> ; T. Ishikawa<sup>asup> ; S. Ishio<sup>asup> ; M. Koga<sup>asup><sup> ; sup><sup>bsup> ; S. Matsuda<sup>asup> ; T. Mitsui<sup>asup> ; D. Motoki<sup>asup> ; K. Nakamura<sup>asup><sup> ; sup><sup>bsup> ; S. Obara<sup>asup> ; M. Otani<sup>asup><sup> ; sup><sup>1sup> ; T. Oura<sup>asup> ; I. Shimizu<sup>asup> ; Y. Shirahata<sup>asup> ; J. Shirai<sup>asup> ; A. Suzuki<sup>asup> ; H. Tachibana<sup>asup> ; K. Tamae<sup>asup> ; K. Ueshima<sup>asup> ; H. Watanabe<sup>asup> ; B.D. Xu<sup>asup><sup> ; sup><sup>2sup> ; H. Yoshida<sup>asup><sup> ; sup><sup>3sup> ; A. Kozlov<sup>bsup> ; Y. Takemoto<sup>bsup> ; S. Yoshida<sup>csup> ; K. Fushimi<sup>dsup> ; T.I. Banks<sup>esup> ; B.E. Berger<sup>esup><sup> ; sup><sup>bsup> ; B.K. Fujikawa<sup>esup><sup> ; sup><sup>bsup> ; T. O'Donnell<sup>esup> ; L.A. Winslow<sup>fsup> ; Y. Efremenko<sup>gsup><sup> ; sup><sup>hsup><sup> ; sup><sup>bsup> ; H.J. Karwowski<sup>isup> ; D.M. Markoff<sup>isup> ; W. Tornow<sup>isup><sup> ; sup><sup>bsup> ; J.A. Detwiler<sup>jsup><sup> ; sup><sup>bsup> ; S. Enomoto<sup>jsup><sup> ; sup><sup>bsup> ; M.P. Decowski<sup>ksup><sup> ; sup><sup>bsup>
• 关键词：Double-beta decay ; 136Xe ; Excited state
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：946
• 期：Complete
• 页码：171-181
• 全文大小：618 K

文摘

A search for double-beta decays of <sup>136sup>Xe to excited states of <sup>136sup>Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The <span id="mmlsi1" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si1.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>01+subsup>span>span>span>, <span id="mmlsi2" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si2.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>21+subsup>span>span>span> and <span id="mmlsi3" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si3.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>22+subsup>span>span>span> transitions of <span id="mmlsi4" class="mathmlsrc"><span 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">0νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">0νββspan>span>span> decay were evaluated in an exposure of <span id="mmlsi30" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="73" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si30.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">89.5 kgspace width="0.2em">space>&sdot;space width="0.2em">space>yrspan>span>span> of <sup>136sup>Xe, while the same transitions of <span id="mmlsi6" class="mathmlsrc"><span 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">2νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">2νββspan>span>span> decay were evaluated in an exposure of <span id="mmlsi7" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="73" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si7.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">61.8 kgspace width="0.2em">space>&sdot;space width="0.2em">space>yrspan>span>span>. No excess over background was found for all decay modes. The lower half-life limits of the <span id="mmlsi2" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si2.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>21+subsup>span>span>span> state transitions of <span id="mmlsi4" class="mathmlsrc"><span 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">0νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">0νββspan>span>span> and <span id="mmlsi6" class="mathmlsrc"><span 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">2νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">2νββspan>span>span> decay were improved to <span id="mmlsi8" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si8.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/20νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>21+subsup>stretchy="false">)>2.6&times;sup>1025sup> yrspan>span>span> and <span id="mmlsi9" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si9.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/22νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>21+subsup>stretchy="false">)>4.6&times;sup>1023sup> yrspan>span>span> (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the <span id="mmlsi1" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si1.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>01+subsup>span>span>span> state of <sup>136sup>Xe for <span id="mmlsi4" class="mathmlsrc"><span 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">0νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">0νββspan>span>span> and <span id="mmlsi6" class="mathmlsrc"><span 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">2νββspan><span class="mathContainer hidden"><span class="mathCode">scroll">2νββspan>span>span> decay. They are <span id="mmlsi10" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si10.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/20νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>01+subsup>stretchy="false">)>2.4&times;sup>1025sup> yrspan>span>span> and <span id="mmlsi11" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si11.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/22νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>01+subsup>stretchy="false">)>8.3&times;sup>1023sup> yrspan>span>span> (90% C.L.). The transitions to the <span id="mmlsi3" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="20" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si3.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>22+subsup>span>span>span> states are also evaluated for the first time to be <span id="mmlsi12" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si12.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/20νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>22+subsup>stretchy="false">)>2.6&times;sup>1025sup> yrspan>span>span> and <span id="mmlsi13" class="mathmlsrc">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">ss="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">script>style="vertical-align:bottom" width="207" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S037594741500278X-si13.gif">script><span class="mathContainer hidden"><span class="mathCode">scroll">subsup>T1stretchy="false">/22νsubsup>stretchy="false">(sup>0+sup>stretchy="false">→subsup>22+subsup>stretchy="false">)>9.0&times;sup>1023sup> yrspan>span>span> (90% C.L.). These results are compared to recent theoretical predictions.