Measurement of neutron-skin thickness by isospin-generalizedproton elastic scattering

为了发展一种新的测量中子皮厚度的方法，研究了电荷交换(p，n)反应到等压模拟态的反应。该反应等价于同位旋对称下的质子弹性散射，其微分截面的斜率应由密度分布的等向量分量的均方根半径决定。测量并比较了116锡和120锡的(p，n)IAS反应的微分截面随动量转移的变化。结果表明，120锡的斜率比116锡的斜率大4%，这可能是由于120锡的中子皮比116锡厚所致

Charge-exchange (p,n) reaction to isobaric analog state has been investigated for the purpose of developing a new approach to the measurement of neutron-skin thickness. This reaction is equivalent to the proton elastic scattering under the isospin symmetry, and the slope of its differential cross section is expected to be determined by the root-mean-square radius of the isovector component of the density distribution. The differential cross sections of the (p,n) IAS reaction from 116Sn and 120Sn have been measured and compared as functions of the momentum transfer. It was found that the slope of120Sn is steeper than that of 116Sn by 4%, which is expected to be the consequence of the fact that120Sn has a thicker neutron skin than 116Sn