Module counts_response 

Separate open-beam and sample count response in detector time.

A detector does not observe a blurred transmission ratio. For discrete true-energy quadrature points E_j, the two physical arms are

O_i = sum_j F_j       R_i(E_j)
S_i = sum_j F_j T_j  R_i(E_j)

F_j is the incident fluence weight at true energy E_j — the incident flux density × detector efficiency × the caller’s energy-integration weight, the discrete form of the contract’s Φ·ε (pipeline-map R5·7: detector efficiency is folded into F_j, never a separate silent factor). T_j is the sample transmission before instrument response, and R_i(E_j) is the probability that a neutron at E_j lands between the actual detector time edges of bin i.

Keeping F_j as an already-integrated weight is deliberate: this operator never guesses energy-bin widths from centers. A caller using a continuous source spectrum must choose and disclose its energy quadrature, then pass F_j = w_j ε(E_j) Φ(E_j). The detector-time integration itself is performed by the response model over the supplied measured bin edges.

The timing_offset_us handed to the response is convention-dependent (mode-relative for tabulated kernels, emission-onset-relative for the analytical Ikeda–Carpenter pulse); see ResolutionFunction::detector_bin_probabilities — a calibrated offset is not transferable between response variants.

Structs

ArmCountPrediction

Signal, additive background, and total expected counts for one measured arm.

DetectorBinResponseMatrix

Detector-bin probabilities for a fixed instrument response.

TwoArmCountPrediction

Complete expected counts for the open-beam and sample measurements.

TwoArmCounts

Expected detector-bin counts for the open-beam and sample measurements.

Enums

CountsResponseError

Invalid inputs or unsupported response models for two_arm_count_response.

Functions

add_count_backgrounds

Add detector-bin backgrounds to an already evaluated two-arm neutron signal.

two_arm_count_response

Apply one instrument response to the open-beam and sample arms separately.