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trans-prob-calc#

trans-prob-calc is a small executable that converts lifetimes to transition probabilities.

It works as follows:

trans-prob-calc -e energy -de energy_unc -t halflife -dt halflife_unc -a mass -m multipolarity

where:

  • energy and energy_unc are the energy and associated error in keV
  • halflife and halflife_unc are the T1/2 of the corresponding state and its associated error in seconds
  • mass is the number of nucleons (for the Weisskopfs conversion)
  • multipolarity is the transition multipolarity (M1,E2...)

Example:

trans-prob-calc -e 689 -de 1 -t 1.0e-9 -dt 0.1e-9 -a 152 -m E2

This prints:

=== B(XL) Transition Probability Calculator ===
Energy: 689 +/- 1 keV
half-life value: 1e-09 +/- 1e-10 s
mass number: 152
multipolarity: E2

--- Results ---
Transition                : E2
Energy                    : 689.000000 keV
Halflife                  : 1.000000e-09 s
B(E2) [W.u.]   (1sigma MC)    : 7.561094e-02 +8.365177e-03 -6.848447e-03
               (1sigma Taylor): 7.561094e-02 +/-7.580978e-03
               (limits)       : 7.561094e-02 +9.013547e-03 -7.370376e-03

The result gives the transition probability in Weisskopf units. The uncertainty is estimated with a Monte Carlo propagation, a first-order Taylor propagation, and direct upper/lower limits from the input uncertainties.

Note that this executable is still under development...