# pyrk.data.precursors module¶

class pyrk.data.precursors.PrecursorData(nuc, e, n)[source]

Bases: object

Lambda()[source]
_get_Lambda(nuc, e)[source]

Mean generation time of the neutrons in this reactor type. [s]

_get_betas(nuc, e)[source]

Retrieves the values for beta_i Data for u235 was obtained from http://arxiv.org/pdf/1001.4100.pdf

_get_lambdas(nuc, e)[source]

Retrieves the values for lambda_i Data for u235 was obtained from http://arxiv.org/pdf/1001.4100.pdf

beta()[source]

The Big Beta is the fraction of all fission neutrons that are delayed.

betas()[source]

The betas are populations of neutron precursors.

lambdas()[source]

The lambdas are the decay constants for the neutron precursor groups.

v_d(nuc, e)[source]

TODO: figure out why you felt you needed this