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First search for α decays of naturally occurring Hf nuclides with emission of γ quanta
Ist Teil von
The European physical journal. A, Hadrons and nuclei, 2020, Vol.56 (1), Article 5
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The first ever search for
α
decays to the first excited state in Yb was performed for six isotopes of hafnium (174, 176, 177, 178, 179, 180) using a high purity Hf sample of natural isotopic abundance with a mass of 179.8 g. For
179
Hf, also
α
decay to the ground state of
175
Yb was searched for thanks to the
β
-instability of the daughter nuclide
175
Yb. The measurements were conducted using an ultra-low-background HPGe-detector system located 225 m underground. After 75 days of data taking no decays were detected but lower bounds for the half-lives of the decays were derived on the level of
lim
T
1
/
2
∼
10
15
-
10
18
a. The decay with the shortest half-life based on theoretical calculation is the decay of
174
Hf to the first
2
+
84.3 keV excited level of
170
Yb. The experimental lower bound was found to be
T
1
/
2
≥
3.3
×
10
15
a.