*Yen Slumps To 11-day Low Of 86.29 Against Swiss Franc

Boj: to Mull buying 3.5 Trln Yen of Long-Term Jgbs, Treasury Bills Within 1 Yr After Start of Pool

Boj: Greater Chance of Delay in Japan Achieving Sustainable Growth Under Stable Prices

*Yen Declines To 6-day Low Of 83.99 Against Dollar

Jgb 2-Year Yield at 0.110 Pct, Below 5-Year Low, After Boj Decision