The cross sections of the isovector spin-dipole resonances (SDR) in the Sb isotopes excited by the (3He, t) charge-exchange reaction at 450 MeV for 0° ≤ θt ≤ 1.15° have been measured. The results are compared with the predicted sum-rule strengths related to the difference of neutron and proton root-mean-square radii. Within the model used, the radii differences (neutron-skin thicknesses) deduced for 114Sn, 116Sn, 118Sn, 122Sn, and 124Sn are ≤0.09, 0.12 ± 0.06, 0.13 ± 0.06, 0.22 ± 0.07, and 0.19 ± 0.07 fm, respectively. This result suggests a new method for the measurement of the neutron-skin thicknesses of unstable nuclei.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - Apr 19 1999|
ASJC Scopus subject areas
- Physics and Astronomy(all)