PI MESONS
\pˈa͡ɪ mˈiːzɒnz], \pˈaɪ mˈiːzɒnz], \p_ˈaɪ m_ˈiː_z_ɒ_n_z]\
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Short-lived elementary particles found in cosmic radiation or produced from nuclear disintegration. Their mass is between that of protons and electrons and they can be negative, positive, or neutral. pi-Mesons (pions) are heavier than mu-mesons (muons) and are proposed for cancer radiotherapy because their capture and disintegration by matter produces powerful, but short-lived, secondary radiation.
By DataStellar Co., Ltd
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Sarah Tittle Bolton
- An American poet; born Newport, Ky., Dec. 18, 1815; died in Ind., Aug. 4, 1893. She is known for her patriotic and war poems, including: "Paddle Your Own Canoe"; "Left on the Battlefield"; etc. "Poems"(New York, 1865; Indianapolis, 1886).