Version 2.3.0 Nov 11, 2021 (e-EE, binom rand, Pb-206, Kr83m)

New Physics:

• Carried over from v2.3 beta: A new binomial random number generator (C++ default library), e- EE models, beta model with new yields and fluctuations, non-beta-ER (XELDA).
• New beta model is default regardless of E-field, but old one is still accessible
• ER model (betas and gammas weighted) is its own function, callable
• Pb-206 ion coming off wall from alpha decay has correct Ly and Qy versus field (Thomas-Imel box model for recomb)
• The electron extraction efficiency model now includes “optimistic” high e- EE Aprile/PandaX fits (activatable with EPS_GAS negative)

Code Quality and/or Miscellaneous Bug Fixes:

• C++11 => 17 default, README updated with all new versioning requirements, but old gcc and cmake versions requested to allow backwards-compatibility with nestpy. std::clamp still doesn’t work, so similar function written by hand
• 1.1 => 1.08 for increasing Qy to match new Zurich W-value measurement, but with new more logical variable names both deep in code and in detector file for user, and with one factor universal in NEST.cpp; general variable renaming for greater clarity
• Numerous cosmetic and aesthetic changes to code, including unused variable removal, while spacing and tabbing made Google clang-format (with shell script for that now included with NEST), if/else Mac dangle warning addressed
• Kr83m yields same but code overhauled to allow min versus max time separation flexibility and easier data comparison, with bug squashed where wrong error message got replayed
• NEST is now ~30% faster, cf. v2.2.4, at least when using gcc 7+, despite the new binomial fluctuation function!

Human Credits:

• Chris, Sophia, Kirsten, Nishat, Greg R., Robert James, Jacob McLaughlin, anyone else I (Matthew) forgot to thank. LZ + XENON + nEXO.