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Python の nuclyr モジュールの使用例

Python の nuclyr モジュールの資料例は以下の通り。水素原子核とヘリウム 原子核の mass excess を得て、 p-p chain で発生するエネルギーを計算した。


#!/usr/pkg/bin/python3.9

# Time-stamp: <2022/04/09 19:20:27 (CST) daisuke>

import nuclyr.mass

# mass excess of 1H (proton)
massexcess_1H, err_massexcess_1H = nuclyr.mass.massExcess (1, 1)

# mass excess of 4He (helium-4)
massexcess_4He, err_massexcess_4He = nuclyr.mass.massExcess (2, 4)

# energy produced by a reaction to create a 4He from four protons
energy_ppchain = massexcess_1H * 4 - massexcess_4He

# printing results
print ("mass excess of 1H (proton)    =", massexcess_1H, \
       "+/-", err_massexcess_1H, "Mev")
print ("mass excess of 4He (helium-4) =", massexcess_4He, \
       "+/-", err_massexcess_4He, "Mev")
print ("energy produced by pp-chain   =", energy_ppchain, "MeV")

実行結果は以下の通り。

% ./nuclyr_00.py
mass excess of 1H (proton)    = 7.289 +/- 0.0 Mev
mass excess of 4He (helium-4) = 2.425 +/- 0.0 Mev
energy produced by pp-chain   = 26.730999999999998 MeV

fig_202204/ppchain_0.png
fig_202204/ppchain_1.png



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