Decay scheme of 176 Lu [5].

Contexts in source publication

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... Francesco.Nozzoli@cern.ch Figure 1 shows the decay scheme of 176 Lu, on the right side the dominant decay chain to 176 Hf is depicted, while on the left side there is the expected EC decay process to 176 Yb. The Q-value for EC decay of 176 Lu (J π = 7 − ) to the 176 Yb ground state (J π = 0 + ) is 107 keV, and the one to the 176 Yb first excited state (J π = 2 + ) is 25 keV. ...

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... analysis proceeds by searching for the 82.1 keV peak in the HP-Ge energy distributions considering two different selections for E LYSO and evaluating the relative signal efficiency from the expected energy distributions of FIG. 8 and 9. In FIG. 10 the HP-Ge energy distribution considering the selection 3keV< E LYSO <18keV is shown, this allows the rejection of most of the intrinsic detector background providing a further ∼50 reduc- Search L-shell EC/REC or for nS-shell REC of 176 Lu in the 176 Yb * 82.1keV level. The cut 3keV< ELYSO <18keV allows further background reduction of ...

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... the other hand, FIG. 11 shows the measured events in the 2keV< E LYSO <4.5keV energy window, this is suitable for the study of the M/N-shell EC/REC channels releasing smaller energy within the LYSO ...

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... signature of the K-shell capture is provided by the x-rays emitted when the Yb atomic vacancy is filled. In particular, K α2 =51.35keV, K α1 =52.4keV and K β =59.3keV are be emitted with a probability of 27.2%, 48.1% and 15.1%, respectively [14]. By comparing these x-ray energies with the measured energy distribution (see e.g. FIG. 11) it is clear that the Yb K β line is the only one distant enough from the nearby Lu and Hf K-shell lines, to be easily identified. Moreover, due to self absorption in the LYSO crystal and in the HP-Ge dead layers, the expected photon detection efficiency for Yb K α lines is quite small, whereas the Yb K β line has ε 88 100% (see FIG. ...

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... the other hand, knowing that the K-shell ionization energy in Yb is 61.3keV, it is possible to estimate a minimum energy of 2keV detected in the LYSO from the additional x-rays/Auger electrons emitted by the Yb atomic de-excitation. Assuming a de- tection of Yb K β x-ray in HP-Ge, in FIG. 12, we show the REC energy distribution (magenta), the 2 keV contribution folded with the LYSO energy resolution (green), compared with the measured LYSO energy distribution for the events where a 59keV signal is observed in the HPGe (shaded area). This measured distribution is characterized by a peak at E LYSO =0 due to intrinsic/external HP-Ge background and a continuous rising distribution due to the known 176 Lu β-decay. ...

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... pure K-shell EC (green line in FIG. 12) was investigated by considering the 2keV< E LYSO <4.5keV selection (ε sel 47%), the number of events attributed to a possible Yb K β peak are N 59 =3±4.6, thus also for this process no evidence is found and the upper limit is: B 59 < 1.8 × 10 −4 ...