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Minato, Futoshi; Fukui, Tokuro*
no journal, ,
A picture of nuclear excited states can be discribed by 1p1h excitation. Experimental data of inelastic scatterings are reasonably reproduced theoretically in this picture. However, it is known that higher-order configurations are important for a better insight of the excited states. This may apply to the inelastic scattering. However, the relation between higher-order configuration and inelastic scattering is not clear. To clarify the relation, we consider 2p2h excitation of target nuclei and focus on the differential cross sections. The 2p2h states of target nuclei are calculated by SRPA. The reaction process is calculated by DWBA. As a reaction channel, inelastic scattering and (p,n) reaction are chosen. It turned out that the diffraction patterns of the differential cross section considering 2p2h were not significantly different from those considering 1p1h although the absolute values were smaller than 1p1h calculation. We discuss it from the nuclear structural point of view.
Yoshida, Kazuki; Moro, A.*; Ogata, Kazuyuki*; G
mez-Ramos, M.*
no journal, ,
Recently, proton-induced nucleon knockout reactions, (p,pN), have been utilized for the nucleon spectroscopy of nuclei, for unstable nuclei in the inverse kinematics in particular. In this study the benchmarking of the three reaction theories for describing the (p,pN) reaction has been done. The momentum distributions calculated with the distorted wave impulse approximation (DWIA) and the transfer-to-the-continuum model (TC) for the 
C(p,pn)
C reaction at 420 MeV/u have been compared with the already published results of the Faddeev/AGS (FAGS) method. The same inputs are adopted to three reaction calculations as much as possible. As a result, a very good agreement has been found between DWIA, TC and FAGS. Within the DWIA framework, the energy dependence of the distorting potentials, which is difficult to be taken into account in the TC and FAGS frameworks, is found to affect in a modest way on the shape and magnitude of the momentum distributions. However, it is found that the inclusion of relativistic corrections increases the knockout cross section by about 30%, which shows the importance of that treatment for deducing the spectroscopic information from the (p,pN) cross sections.
Yoshida, Kazuki; Ogata, Kazuyuki*; Kanada-En'yo, Yoshiko*
no journal, ,
The alpha clustering has been one of the main interest in nuclear physics. In order to probe the alpha clustering through reaction observables, the proton-induced alpha knockout reaction, (p,p alpha), is considered in this study. The purpose of this work is to reveal how the alpha cluster amplitude is probed through the (p,p alpha) reactions. Within the distorted wave impulse approximation (DWIA) framework, We have newly introduced the "masking function" which defines the probed region of the alpha cluster amplitude through the (p,p alpha) reactions. It has been clearly shown by means of the masking function that the alpha knockout reaction probes the alpha cluster in the nuclear surface, which will be the direct measure of well-developed alpha cluster states. A simplified form of the masking function is also introduced and the incident energy dependence of the masking effect is investigated. As a conclusion, alpha knockout reaction can be the probe for the alpha cluster amplitude in the nuclear surface owing to the masking effect originated from the absorption of distorting potentials, and is a suitable method to investigate how alpha cluster states are spatially developed.