Observation of internal-conversion electrons emitted from Th229m produced by β decay of Ac229

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Y. Shigekawa ◽  
Y. Kasamatsu ◽  
E. Watanabe ◽  
H. Ninomiya ◽  
S. Hayami ◽  
...  
1960 ◽  
Vol 18 ◽  
pp. 122-130 ◽  
Author(s):  
M.E. Vishnevsky ◽  
V.A. Lyubimov ◽  
E.F. Tretyakov ◽  
G.I. Grishuk

1964 ◽  
Vol 2 (4) ◽  
pp. 241-262 ◽  
Author(s):  
S. Forberg ◽  
E. Odeblad ◽  
R. Söremark ◽  
S. Ullberg

2016 ◽  
Vol 123 ◽  
pp. 04005 ◽  
Author(s):  
J. Smallcombe ◽  
M. Moukaddam ◽  
L. J. Evitts ◽  
A. B. Garnsworthy ◽  
S. Hallam ◽  
...  

1967 ◽  
Vol 45 (7) ◽  
pp. 2281-2293 ◽  
Author(s):  
J. S. Geiger ◽  
R. L. Graham

A search has been made for delayed γ rays with 1 second [Formula: see text] minutes following 10.5-MeV proton bombardment of 18 natural metallic targets. The five activities observed are: (1) 139Ce, Eγ = 754.5 ± 1.3 keV, [Formula: see text] second; (2) 141Nd, Eγ = 756.8 ± 1.3 keV, [Formula: see text] second; (3) 161Ho, Eγ = 211 ± 2 keV, [Formula: see text] second; (4) 163Ho, Eγ = 299 ± 2 keV, [Formula: see text] second; and (5) a γ ray of 122 ± 2 keV, [Formula: see text] second which is tentatively assigned to 179Ta. All transitions have been measured using a Ge(Li) γ-ray detector. The internal conversion electrons of the transitions in 139Ce and 141Nd were also studied using an orange β-ray spectrometer. Rotational transition energies in 158Dy, 164Er, 168Yb, and 174Hf were measured in conjunction with the internal conversion studies and are reported in an Appendix.


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