Investigation of beta beta decay in (150)Nd and (148) Nd to the excited states of daughter nuclei
Investigation of beta beta decay in (150)Nd and (148) Nd to the excited states of daughter nuclei
复制标题
(150)Nd 和 (148)Nd 的 β β 衰变到子核激发态的研究
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
V. Umatov
中科院分区：
文献类型：
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作者：
A. Barabash;P. Hubert;A. Nachab;V. Umatov
用400 cm 3低本底HPGe探测器和3046 g天然Nd 2 O3粉末组成的外源研究了150 Nd和148 Nd到子核激发态的双β衰变。测得150 Nd到150 Sm激发态0 + 1的双中微子双β衰变半衰期为T1/2 = [1.33 +0.36 <$0.23（stat）+0.27 <$0.13（syst）] × 1020年。对于150 Sm的其它（0 v +2 v）跃迁到2 + 1，2 + 2，2 + 3和0 + 2能级，极限在150 Sm（2―8）× 10 20 yr能级。在148 Nd的情况下，只得到了148 Sm的（0 v +2 v）跃迁到2 + 1，0 + 1和2 + 2激发态的极限，其能级为~（4―8）× 1020 yr.
Double beta decay of 150 Nd and 148 Nd to the excited states of daughter nuclei have been studied using a 400 cm 3 low-background HPGe detector and an external source consisting of 3046 g of natural Nd 2 O 3 powder. The half-life for the two-neutrino double beta decay of 150 Nd to the excited 0 + 1 state in 150 Sm is measured to be T 1/2 = [1.33 +0.36 ―0.23 (stat) +0.27 ―0.13 (syst)] × 10 20 yr. For other (0v + 2v) transitions to the 2 + 1 , 2 + 2 , 2 + 3 , and 0 + 2 levels in 150 Sm, limits are obtained at the level of ∼(2―8) x 10 20 yr. In the case of 148 Nd only limits for the (0v + 2v) transitions to the 2 + 1 , 0 + 1 , and 2 + 2 excited states in 148 Sm were obtained and are at the level of ∼(4―8) × 10 20 yr.