Unexpectedly enhanced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>?</mml:mi></mml:math> -particle preformation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ti</mml:mi><mml:mprescripts /><mml:none /><mml:mn>48</mml:mn></mml:mmultiscripts></mml:math> probed by the ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mi>?</mml:mi></mml:mrow></mml:math> ) reaction

The formation of $\ensuremath{\alpha}$ particles on nuclear surfaces has remained a fundamental problem since the dawn physics. This $\ensuremath{\alpha}$-particle strongly affects $\ensuremath{\alpha}$-decay lifetimes heavy and superheavy elements, level scheme light nuclei, synthesis elements in stars. However, despite its importance, medium-mass nuclei is seldom investigated. Based $^{48}\mathrm{Ti}(p,p\ensuremath{\alpha})^{44}\mathrm{Ca}$ reaction analysis, this study reports that $^{48}\mathrm{Ti}$ nucleus pronounced more compared to expected through mean-field approximations. Moreover, estimated average distance between particle residue equals approximately 4.5 fm. result poses challenge describe four nucleon correlations using microscopic models.