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

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• 作者：K. Asakura^a ; A. Gando^a ; ^{azusa@awa.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Y. Gando^a ; T. Hachiya^a ; S. Hayashida^a ; H. Ikeda^a ; K. Inoue^a ; ^b ; K. Ishidoshiro^a ; T. Ishikawa^a ; S. Ishio^a ; M. Koga^a ; ^b ; S. Matsuda^a ; T. Mitsui^a ; D. Motoki^a ; K. Nakamura^a ; ^b ; S. Obara^a ; M. Otani^a ; ¹ ; T. Oura^a ; I. Shimizu^a ; Y. Shirahata^a ; J. Shirai^a ; A. Suzuki^a ; H. Tachibana^a ; K. Tamae^a ; K. Ueshima^a ; H. Watanabe^a ; B.D. Xu^a ; ² ; H. Yoshida^a ; ³ ; A. Kozlov^b ; Y. Takemoto^b ; S. Yoshida^c ; K. Fushimi^d ; T.I. Banks^e ; B.E. Berger^e ; ^b ; B.K. Fujikawa^e ; ^b ; T. O'Donnell^e ; L.A. Winslow^f ; Y. Efremenko^g ; ^h ; ^b ; H.J. Karwowskiⁱ ; D.M. Markoffⁱ ; W. Tornowⁱ ; ^b ; J.A. Detwiler^j ; ^b ; S. Enomoto^j ; ^b ; M.P. Decowski^k ; ^b
• 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 ¹³⁶Xe to excited states of ¹³⁶Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si1.gif">thContainer hidden">thCode">th altimg="si1.gif" overflow="scroll">01+th>, thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si2.gif">thContainer hidden">thCode">th altimg="si2.gif" overflow="scroll">21+th> and thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si3.gif">thContainer hidden">thCode">th altimg="si3.gif" overflow="scroll">22+th> transitions of thmlsrc">thImg" 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">0νββthContainer hidden">thCode">th altimg="si4.gif" overflow="scroll">0νββth> decay were evaluated in an exposure of thmlsrc">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">th="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">thContainer hidden">thCode">th altimg="si30.gif" overflow="scroll">89.5 kgth="0.2em">⋅th="0.2em">yrth> of ¹³⁶Xe, while the same transitions of thmlsrc">thImg" 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">2νββthContainer hidden">thCode">th altimg="si6.gif" overflow="scroll">2νββth> decay were evaluated in an exposure of thmlsrc">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">th="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">thContainer hidden">thCode">th altimg="si7.gif" overflow="scroll">61.8 kgth="0.2em">⋅th="0.2em">yrth>. No excess over background was found for all decay modes. The lower half-life limits of the thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si2.gif">thContainer hidden">thCode">th altimg="si2.gif" overflow="scroll">21+th> state transitions of thmlsrc">thImg" 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">0νββthContainer hidden">thCode">th altimg="si4.gif" overflow="scroll">0νββth> and thmlsrc">thImg" 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">2νββthContainer hidden">thCode">th altimg="si6.gif" overflow="scroll">2νββth> decay were improved to thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si8.gif">thContainer hidden">thCode">th altimg="si8.gif" overflow="scroll">T1/20ν(0+→21+)>2.6×1025 yrth> and thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si9.gif">thContainer hidden">thCode">th altimg="si9.gif" overflow="scroll">T1/22ν(0+→21+)>4.6×1023 yrth> (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si1.gif">thContainer hidden">thCode">th altimg="si1.gif" overflow="scroll">01+th> state of ¹³⁶Xe for thmlsrc">thImg" 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">0νββthContainer hidden">thCode">th altimg="si4.gif" overflow="scroll">0νββth> and thmlsrc">thImg" 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">2νββthContainer hidden">thCode">th altimg="si6.gif" overflow="scroll">2νββth> decay. They are thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si10.gif">thContainer hidden">thCode">th altimg="si10.gif" overflow="scroll">T1/20ν(0+→01+)>2.4×1025 yrth> and thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si11.gif">thContainer hidden">thCode">th altimg="si11.gif" overflow="scroll">T1/22ν(0+→01+)>8.3×1023 yrth> (90% C.L.). The transitions to the thmlsrc">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">th="20" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si3.gif">thContainer hidden">thCode">th altimg="si3.gif" overflow="scroll">22+th> states are also evaluated for the first time to be thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si12.gif">thContainer hidden">thCode">th altimg="si12.gif" overflow="scroll">T1/20ν(0+→22+)>2.6×1025 yrth> and thmlsrc">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">th="207" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037594741500278X-si13.gif">thContainer hidden">thCode">th altimg="si13.gif" overflow="scroll">T1/22ν(0+→22+)>9.0×1023 yrth> (90% C.L.). These results are compared to recent theoretical predictions.