Beta decays of /sup 18/Ne and /sup 19/Ne and their relation to parity mixing in /sup 18/F and /sup 19/F
Beta decays of /sup 18/Ne and /sup 19/Ne and their relation to parity mixing in /sup 18/F and /sup 19/F
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/sup 18/Ne 和 /sup 19/Ne 的 Beta 衰变及其与 /sup 18/F 和 /sup 19/F 中奇偶校验混合的关系
DOI：
10.1103/physrevc.27.2833
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
W. Haxton
中科院分区：
文献类型：
--
作者：
E. Adelberger;M. Hindi;C. Hoyle;H. Swanson;A. V. Lintig;W. Haxton
我们已经研究了弱馈电的跃迁。beta.. /sup 18/Ne和/sup 19/Ne的sup +/衰变。用12.0MeV/sup 3/He离子轰击天然O/sub 2/气体产生了/sup 18/Ne活度。..伽马.. -观测到能量为659、1042、1081和1700 keV的射线群，相对强度分别为1.72 ± 0.05、100.0、（2.89 ± 0.26）× 10/sup-2/和0.687 ± 0.013。这些强度对应于100.0、（2.70 ± 0.36）× 10/sup-2/和2.45 ± 0.05的相对支化比。beta.. sup +/分别跃迁到1042、1081和1700 keV水平。归一化到以前的数据，我们得到的ft值为1247 +- 11，2971 +- 87，（1.03 +- 0.14）x 10/sup 7/，和（3.00 +- 0.10）x 10/sup 4/ sec的跃迁到基态，1042，1081，和1700 keV的水平，分别。发现0/sup -/和0/sup +/态的激发能差为39.20 ± 0.11 keV。用6.4MeV质子轰击SF/sub 6/ gas产生了/sup 19/Ne活度。对于跃迁到110 keV能级，得到的分支比为（1.20 ± 0.20）× 10/sup-4/，对应的ft值为（1.15 ± 0.19）× 10/sup 7/ sec。在9.2%Ge（Li）探测器中观察到1554 keV能级的跃迁。得到的支化比为（2.34 ± 0.30）× 10/sup-5/sec，相当于ft值为（5.01 ± 0.47）× 10/sup-5/ sec。/sup 18/Ne（0/sup +/;1）..-->.. /sup 18/F（1081 keV 0/sup -/;0）和/sup 19/Ne（1/2/sup +/; 1/2）..-->../ sup 19/F（110 keV 1/2/sup -/; 1/2）第一禁带。beta.. sup +/分支分别是先前测量的/sup 18/F的1042 keV（0/sup +/;1）和1081（0/sup -/;1）keV能级以及/sup 19/F的基态（（1/2）/sup +/;（1/2））和110 keV（（1/2）/sup -/;（1/2））能级的宇称混合的类似物。«少
We have studied transitions weakly fed in the ..beta../sup +/ decays of /sup 18/Ne and /sup 19/Ne. The /sup 18/Ne activity was produced by bombarding natural O/sub 2/ gas with 12.0 MeV /sup 3/He ions. ..gamma..-ray groups with energies of 659, 1042, 1081, and 1700 keV were observed with relative intensities of 1.72 +- 0.05, 100.0, (2.89 +- 0.26) x 10/sup -2/, and 0.687 +- 0.013, respectively. These intensities correspond to relative branching ratios of 100.0, (2.70 +- 0.36) x 10/sup -2/, and 2.45 +- 0.05 for ..beta../sup +/ transitions to the 1042, 1081, and 1700 keV levels, respectively. Normalizing to previous data we obtain ft values of 1247 +- 11, 2971 +- 87, (1.03 +- 0.14) x 10/sup 7/, and (3.00 +- 0.10) x 10/sup 4/ sec for the transitions to the ground state, 1042, 1081, and 1700 keV levels, respectively. The difference in excitation energies of the 0/sup -/ and 0/sup +/ states is found to be 39.20 +- 0.11 keV. The /sup 19/Ne activity was produced by bombarding SF/sub 6/ gas by 6.4 MeV protons. A branching ratio of (1.20 +- 0.20) x 10/sup -4/ was obtained for the transition to the 110 keV level which correspondsmore » to an ft value of (1.15 +- 0.19) x 10/sup 7/ sec. Transitions to the 1554 keV level were observed in a 9.2% Ge(Li) detector operated in the singles mode. A branching ratio of (2.34 +- 0.30) x 10/sup -5/ was obtained which corresponds to an ft value of (5.01 +- 0.47) x 10/sup 5/ sec. The /sup 18/Ne(0/sup +/;1)..-->.. /sup 18/F(1081 keV 0/sup -/;0) and /sup 19/Ne(1/2/sup +/; 1/2)..-->../sup 19/F (110 keV 1/2/sup -/; 1/2) first-forbidden ..beta../sup +/ branches are analogs of the previously measured parity mixing of the 1042 keV (0/sup +/;1) and 1081 (0/sup -/;1) keV levels of /sup 18/F and of the ground ((1/2)/sup +/;(1/2)) and 110 keV ((1/2)/sup -/;(1/2)) levels of /sup 19/F, respectively.« less