论文标题
$^{58} $ ni，$^{90} $ zr，$^{120} $ sn和$^{208} $ PB
Isoscalar giant monopole strength in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb
论文作者
论文摘要
已经建立了数百MeV和非常前瞻性的散射角度的无弹性$α$ - 粒子散射，包括$ 0^\ Circ $，作为研究核中Isoscalar Giant Monopole（IS0）强度分布的研究工具。 An independent investigation of the IS0 strength in nuclei across a wide mass range was performed using the $0^\circ$ facility at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS), South Africa, to understand differences observed between IS0 strength distributions in previous experiments performed at the Texas A\&M University (TAMU) Cyclotron Institute, USA and the Research Center for Nuclear Physics (RCNP), 日本。等镜巨型单极共振（ISGMR）在$^{58} $ ni，$^{90} $ zr，$^{120} $ sn $ sn和$^{208} $ pb使用$ $α$ a $ partsical intermasticle弹药中，带有$ 196 $ mev $ beam $ a $α$ beam $α$α$ n = 0^\ circ $和$ 4^\ circ $。 ITHEMBA LABS的K $ 600 $磁性光谱仪用于检测和动量分析无弹性散射的$α$颗粒。研究核中研究原子核中的IS0强度分布是通过光谱差（DOS）技术推导的，其中包括基于$ L> 0 $ $ cross cross exection的$ 4^\ circ $数据的校正因子。 $^{58} $ ni，$^{90} $ zr，$^{120} $ sn和$^{208} $ pb的IS0强度分布在激发器 - 能源$ e _ {\ rm x} = 9-25 $ MEV.使用rcortion cortion cortive factire in is rcnp实验中提取。 $^{58} $ ni中的IS0强度的良好协议也是从TAMU结果中得出的校正因子，而对于$^{90} $ ZR和$^{208} $ PB的校正因子。
Inelastic $α$-particle scattering at energies of a few hundred MeV and very-forward scattering angles including $0^\circ$ has been established as a tool for the study of the isoscalar giant monopole (IS0) strength distributions in nuclei. An independent investigation of the IS0 strength in nuclei across a wide mass range was performed using the $0^\circ$ facility at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS), South Africa, to understand differences observed between IS0 strength distributions in previous experiments performed at the Texas A\&M University (TAMU) Cyclotron Institute, USA and the Research Center for Nuclear Physics (RCNP), Japan. The isoscalar giant monopole resonance (ISGMR) was excited in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb using $α$-particle inelastic scattering with $196$ MeV $α$ beam and scattering angles $θ_{\text{Lab}} = 0^\circ$ and $4^\circ$. The K$600$ magnetic spectrometer at iThemba LABS was used to detect and momentum analyze the inelastically scattered $α$ particles. The IS0 strength distributions in the nuclei studied were deduced with the difference-of-spectra (DoS) technique including a correction factor for the $4^\circ$ data based on the decomposition of $L > 0$ cross sections in previous experiments. IS0 strength distributions for $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb are extracted in the excitation-energy region $E_{\rm x} = 9 - 25$ MeV.Using correction factors extracted from the RCNP experiments, there is a fair agreement with their published IS0 results. Good agreement for IS0 strength in $^{58}$Ni is also obtained with correction factors deduced from the TAMU results, while marked differences are found for $^{90}$Zr and $^{208}$Pb.
