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We consider the effects on big bang nucleosynthesis (BBN) of the radiativedecay of a long-lived massive particle. If high-energy photons are emittedafter the BBN epoch ($t \sim 1 - 10^3$ sec), they may change the abundances ofthe light elements through photodissociation processes, which may result in asignificant discrepancy between standard BBN and observation. Taking intoaccount recent observational and theoretical developments in this field, werevise our previous study constraining the abundance of theradiatively-decaying particles. In particular, on the theoretical side, it wasrecently claimed that the non-thermal production of $^6$Li, which is caused bythe photodissociation of $\hefour$, most severely constrains the abundance ofthe radiatively-decaying particle. We will see, however, it is premature toemphasize the importance of the non-thermal production of $^6$Li because (i)the theoretical computation of the $^6$Li abundance has large uncertainty dueto the lack of the precise understanding of the $^6$Li production crosssection, and (ii) the observational data of $^6$Li abundance has large errors.Comment: 15 pages, using REVTeX and 3 postscript figure

Radiative decay of a massive particle and the nonthermal process in primordial nucleosynthesis