Phys. Rev. Lett. 112, 172501 (2014) - <span class="aps-inline-formula"><math display="inline"><mrow><mmultiscripts><mrow><mi>Ca</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>48</mn></mrow></mmultiscripts><mo>+</mo><mmultiscripts><mrow><mi>Bk</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>249</mn></mrow></mmultiscripts></mrow></math></span> Fusion Reaction Leading to Element <span class="aps-inline-formula"><math display="inline"><mrow><mi>Z</mi><mo>=</mo><mn>117</mn></mrow></math></span>: Long-Lived <span class="aps-inline-formula"><math display="inline"><mi>α</mi></math></span>-Decaying <span class="aps-inline-formula"><math display="inline"><mrow><mmultiscripts><mrow><mi>Db</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>270</mn></mrow></mmultiscripts></mrow></math></span> and Discovery of <span class="aps-inline-formula"><math display="inline"><mrow><mmultiscripts><mrow><mi>Lr</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>266</mn></mrow></mmultiscripts></mrow></math></span>