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The origin of lithium (Li) and its production process have long been anunsettled question in cosmology and astrophysics. Candidates environments of Liproduction events or sites suggested by previous studies include big bangnucleosynthesis, interactions of energetic cosmic rays with interstellarmatter, evolved low mass stars, novae, and supernova explosions. Chemicalevolution models and observed stellar Li abundances suggest that at least halfof the present Li abundance may have been produced in red giants, asymptoticgiant branch (AGB) stars, and novae. However, no direct evidence for the supplyof Li from stellar objects to the Galactic medium has yet been found. Here wereport on the detection of highly blue-shifted resonance lines of the singlyionized radioactive isotope of beryllium, $^{7}$Be, in the near ultraviolet(UV) spectra of the classical nova V339 Del (Nova Delphini 2013). Spectra wereobtained 38 to 48 days after the explosion. $^{7}$Be decays to form $^{7}$Liwithin a short time (half-life 53.22 days). The spectroscopic detection of thisfragile isotope implies that it has been created during the nova explosion viathe reaction $^{3}\mbox{He}(\alpha,\gamma)^{7}\mbox{Be}$, and supports thetheoretical prediction that a significant amount of $^{7}$Li could be producedin classical nova explosions. This finding opens a new way to explore $^{7}$Liproduction in classical novae and provides a clue to the mystery of theGalactic evolution of lithium.

Explosive lithium production in the classical nova V339 Del (Nova Delphini 2013)