Abstract
We demonstrate the possibility to extract nuclear state femtosecond lifetimes from two-step \(\gamma \) ray cascades measured with a Ge-detector array. The technique is based on measuring the Doppler shift of a \(\gamma \) ray, caused by the recoil of a preceding \(\gamma \) ray emission. Since the two \(\gamma \) rays are populating/de-populating the same state they form a start/stop signal, the delay of which is compared to the slowing down motion of the nucleus within the target material. A multi-detector array combined with digital acquisition electronics in list mode, allows to measure several angular combinations and two-step cascades efficiently and simultaneously within one single experiment. The concept was demonstrated with the FIPPS array for the \(^{35}\hbox {Cl(n,}\gamma \hbox {)}^{36}\hbox {Cl}\) reaction, where we obtained good agreement with literature values showing the validity of the method.
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Data Availability Statement
This manuscript has associated data in a data repository. [Authors’ comment: The reference to the data is already included in the references of the paper as DOI].
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Communicated by Calin Alexandru Ur.
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Crespi, F.C.L., Cieplicka-Oryńczak, N., Jentschel, M. et al. GRIDSA: femtosecond lifetime measurements with germanium detector arrays. Eur. Phys. J. A 56, 94 (2020). https://doi.org/10.1140/epja/s10050-020-00088-x
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DOI: https://doi.org/10.1140/epja/s10050-020-00088-x