Collapse, Not Computation · source record · paper

A Search for Spontaneous Radiation from Wavefunction Collapse in the Majorana Demonstrator

I. J. Arnquist; Majorana Collaboration · 2023

AI-verified citationSRC-ARNQUIST-2023

identifier / locator: arxiv:2202.01343
url: https://arxiv.org/abs/2202.01343
verification note: text retrieved and shown to the drafter on 2026-09-11 (run 2026-09-11-draft-orch-or-115454); passages checked by the verify verb
reliability notes: Published as Phys. Rev. Lett. 129, 080401; text read from the arXiv PDF (v5, 12 Jun 2023).
Underground ultra-low-background germanium experiment; independent of the Gran Sasso team of SRC-DONADI-2021 but tests the same radiation channel.
Limits apply to the white-noise (frequency-independent) collapse models; the authors note coloured-noise extensions evade them.

Evidence drawn from this source

Supports· strongORCH-E047

Majorana Demonstrator: no spontaneous collapse radiation in 37.5 kg-y of enriched germanium

what the source states: The collaboration reports that, although white-noise collapse models predict a 1/E X-ray signature, they find "no evidence of such radiation in the 19-100 keV range" in a 37.5 kg-y enriched-germanium exposure collected between 2015 and 2019, with a best-fit signal of 6.3 ± 398.8 counts.
what we infer: An independent underground collaboration reproduces the null in the same channel Gran Sasso searched, so ORCH-C031 no longer rests on a single experiment.
limitations: Constrains only the white-noise formulation; the authors state coloured-noise extensions with a cutoff near 10^11–10^12 Hz evade X-ray bounds.
The DP interpretation is a secondary re-expression of a CSL-oriented search.

I. J. Arnquist (2023)AI-verified citationORCH-C047

Supports· strongORCH-E049

A second underground null adds weight to the exclusion of the parameter-free DP model

what the source states: The collaboration closes by stating that it improved the lower limit on the Diósi–Penrose collapse model by almost an order of magnitude, "adding significance to the exclusion of the parameter-free version of the model".
what we infer: Direction here is toward the physics conjunct and toward the Gran Sasso finding's generalization: an independent group reaches the same verdict about the parameter-free version, so the squeeze on ORCH-C030 is no longer single-experiment.
limitations: Same radiation channel as SRC-DONADI-2021, so not an independent test of the mechanism, only of the measurement.
Does not address Penrose's characteristic-lifetime formulation, which predicts no radiation.
Second reader (claude-sonnet-5, 2026-09-11, run 2026-09-11-verify-orch-or-120610, verify-v6) found the passage bears in different directions on the claims the record named; this record carries "supports" toward ORCH-C031, the rest went to a record of its own at intake: The quoted conclusion is accurate and correctly located, and the record properly flags the shared radiation channel with the 2021 underground test as a non-independence issue. But labeling this as 'undermines' is backwards: a second, independent (mostly) underground null result tightening the DP bound and reinforcing exclusion of the parameter-free model actually supports ORCH-C031, which states exactly that outcome. For ORCH-C030, which concerns the general characteristic-lifetime collapse formulation rather than the parameter-free DP model specifically, the passage is only background context, not a direct bearing on that claim's truth.

I. J. Arnquist (2023)AI-verified citationORCH-C031

Context· strongORCH-E070

A second underground null adds weight to the exclusion of the parameter-free DP model — toward ORCH-C030

what the source states: The collaboration closes by stating that it improved the lower limit on the Diósi–Penrose collapse model by almost an order of magnitude, "adding significance to the exclusion of the parameter-free version of the model".
what we infer: Direction here is toward the physics conjunct and toward the Gran Sasso finding's generalization: an independent group reaches the same verdict about the parameter-free version, so the squeeze on ORCH-C030 is no longer single-experiment.
limitations: Same radiation channel as SRC-DONADI-2021, so not an independent test of the mechanism, only of the measurement.
Does not address Penrose's characteristic-lifetime formulation, which predicts no radiation.
Second reader (claude-sonnet-5, 2026-09-11, run 2026-09-11-verify-orch-or-120610, verify-v6) found the passage bears in different directions on the claims the record named; this record carries "context" toward ORCH-C030, the rest went to a record of its own at intake: The quoted conclusion is accurate and correctly located, and the record properly flags the shared radiation channel with the 2021 underground test as a non-independence issue. But labeling this as 'undermines' is backwards: a second, independent (mostly) underground null result tightening the DP bound and reinforcing exclusion of the parameter-free model actually supports ORCH-C031, which states exactly that outcome. For ORCH-C030, which concerns the general characteristic-lifetime collapse formulation rather than the parameter-free DP model specifically, the passage is only background context, not a direct bearing on that claim's truth.

I. J. Arnquist (2023)AI-verified citationORCH-C030