Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-11-21
Phys.Rev.Lett. 92 (2004) 072302
Physics
Nuclear Physics
Nuclear Experiment
4 pages including 3 postscript figures, RevTeX 4 with multirow.sty, submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.92.072302
Deeply bound 1s states of $\pi^-$ in $^{115,119,123}$Sn were preferentially observed using the Sn($d$,$^3$He) pion-transfer reaction under the recoil-free condition. The 1s binding energies and widths were precisely determined, and were used to deduce the isovector parameter of the s-wave pion-nucleus potential to be $b_1 =-0.115\pm 0.007 ~m_{\pi}^{-1}$. The observed enhancement of $|b_1|$ over the free $\pi N$ value ($b_1^{\rm free}/b_1 = 0.78 \pm 0.05$) indicates a reduction of the chiral order parameter, $f^{*}_{\pi} (\rho)^2/f_{\pi}^2 \approx 0.64$, at the normal nuclear density, $\rho = \rho_0$.
Fujita Masaki
Geissel Hans
Gilg H.
Gillitzer A.
Hayano Ruyugo S.
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