2012年5月
First result from KamLAND-Zen : Double beta decay with 136-Xe
ARISF
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- 開始ページ
- 359
- 終了ページ
- 364
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- 記事・総説・解説・論説等（国際会議プロシーディングズ）
We present the first result of the KamLAND-Zen experiment, measurement of<br />
136-Xe double-beta decay. In an exposure of 77.6 days with 129 kg of 136-Xe,<br />
two-neutrino double-beta decay half-life is measured precisely to be<br />
T_{1/2}^{2\nu} = 2.38 +/- 0.02(stat) +/- 0.14(syst) x 10^{21} yr. This value is<br />
consistent with the measurement by EXO-200 and significantly below the lower<br />
limit obtained by previous experiment. For the neutrinoless double-beta decay<br />
half-life, improved lower limit is set to T_{1/2}^{0\nu} > 5.7 x 10^{24} yr at<br />
90% C.L. and corresponding upper limit of the effective neutrino mass is ranged<br />
to 0.3-0.6 eV depending on the adopted nuclear matrix elements.
136-Xe double-beta decay. In an exposure of 77.6 days with 129 kg of 136-Xe,<br />
two-neutrino double-beta decay half-life is measured precisely to be<br />
T_{1/2}^{2\nu} = 2.38 +/- 0.02(stat) +/- 0.14(syst) x 10^{21} yr. This value is<br />
consistent with the measurement by EXO-200 and significantly below the lower<br />
limit obtained by previous experiment. For the neutrinoless double-beta decay<br />
half-life, improved lower limit is set to T_{1/2}^{0\nu} > 5.7 x 10^{24} yr at<br />
90% C.L. and corresponding upper limit of the effective neutrino mass is ranged<br />
to 0.3-0.6 eV depending on the adopted nuclear matrix elements.
- ID情報
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- arXiv ID : arXiv:1205.6130