Details

Autor(en) / Beteiligte

• Antochi, Vasile C.
• Conrad, Jan
• Gallo Rosso, Andrea
• Joy, Ashley
• Mahlstedt, Jörn
• Tan, Pueh-Leng

Titel

Low-energy calibration of XENON1T with an internal 37 Ar source

Ist Teil von

• The European physical journal. C, Particles and fields, 2023-06, Vol.83 (6), p.1-15

Ort / Verlag

SpringerOpen

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A low-energy electronic recoil calibration of XENON1T, a dual-phase xenon time projection chamber, with an internal 37Ar source was performed. This calibration source features a 35-day half-life and provides two mono-energetic lines at 2.82 keV and 0.27 keV. The photon yield and electron yield at 2.82 keV are measured to be (32.3±0.3) photons/keV and (40.6±0.5) electrons/keV, respectively, in agreement with other measurements and with NEST predictions. The electron yield at 0.27 keV is also measured and it is (68.0+6.3−3.7) electrons/keV. The 37Ar calibration confirms that the detector is well-understood in the energy region close to the detection threshold, with the 2.82 keV line reconstructed at (2.83±0.02) keV, which further validates the model used to interpret the low-energy electronic recoil excess previously reported by XENON1T. The ability to efficiently remove argon with cryogenic distillation after the calibration proves that 37Ar can be considered as a regular calibration source for multi-tonne xenon detectors.