XENONnT extracted nuclear recoil light and charge yields in liquid xenon from 0.3 to 5 keV_NR using 474 events from a ⁸⁸YBe source after subtracting 55 background events.
A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section
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abstract
The $^9$Be$(\gamma,n)^8$Be reaction is enhanced by a near threshold $1/2^+$ state. Contradictions between existing measurements of this reaction cross-section affect calculations of astrophysical r-process yields, dark matter detector calibrations, and the theory of the nuclear structure of $^9$Be. Select well-documented radioisotope $^9$Be$(\gamma,n)$ source yield measurements have been reanalyzed, providing a set of high-accuracy independently measured cross sections. A Breit-Wigner fit of these corrected measurements yields $E_R=1738.8\pm1.9$ keV, $\Gamma_\gamma=0.771\pm0.021$ eV, and $\Gamma_n=268\pm15$ keV for the $1/2^+$ state. A virtual $1/2^+$ state is excluded with 99.3\% confidence.
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physics.ins-det 1years
2024 1verdicts
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Low-Energy Nuclear Recoil Calibration of XENONnT with a $^{88}$YBe Photoneutron Source
XENONnT extracted nuclear recoil light and charge yields in liquid xenon from 0.3 to 5 keV_NR using 474 events from a ⁸⁸YBe source after subtracting 55 background events.