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A theory was verified by Hans Bethe in 1939 showing that beta decay and quantum tunneling in the Sun 's core might convert one of the protons into a neutron and thereby producing deuterium rather than a diproton .
 Hans Bethe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Hans Bethe