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25 April 2024
 
  » arxiv » nucl-ex/0211023

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Precision spectroscopy of pionic 1s states of Sn nuclei and evidence for partial restoration of chiral symmetry in the nuclear medium
K. Suzuki ; M. Fujita ; H. Geissel ; H. Gilg ; A. Gillitzer ; R.S. Hayano ; S. Hirenzaki ; K. Itahashi ; M. Iwasaki ; P. Kienle ; M. Matos ; G. Münzenberg ; T. Ohtsubo ; M. Sato ; M. Shindo ; T. Suzuki ; H. Weick ; M. Winkler ; T. Yamazaki ; T. Yoneyama ;
Date 21 Nov 2002
Journal Phys.Rev.Lett. 92 (2004) 072302
Subject nucl-ex nucl-th
AbstractDeeply 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 $b_1 =-0.115pm 0.007 ~m_{pi}^{-1}$. The observed enhancement of $|b_1|$ over the free $pi N$ value ($b_1^{ m free}/b_1 = 0.78 pm 0.05$) indicates a reduction of the chiral order parameter, $f^{*}_{pi} ( ho)^2/f_{pi}^2 approx 0.64$, at the normal nuclear density, $ ho = ho_0$.
Source arXiv, nucl-ex/0211023
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