Abstract
In this review article we discuss the present status of direct nuclear reactions and the nuclear structure aspects one can study with them. We discuss the spectroscopic information we can assess in experiments involving transfer reactions, heavy-ion-induced knockout reactions and quasifree scattering with (p,2p), (p,pn), and (e,e′p) reactions. In particular, we focus on the proton-to-neutron asymmetry of the quenching of the spectroscopic strength.
Highlights
The structure of nuclei and its evolution with the number of constituent nucleons, in particular with neutron-toproton asymmetry, has been a fascinating and multifaceted area in nuclear physics for a long time
On the quest to study the structural evolution of rare isotopes near the nucleon driplines, often only available for experiments as low-intensity, fast beams of ions with energies exceeding 50 MeV/nucleon, 9Be- or 12C-induced one-nucleon removal reactions have been introduced and developed by Gregers Hansen and the NSCL team for spectroscopy as a fast-beam, inverse-kinematics alternative to light-ion-induced transfer reactions that remove a nucleon from the nucleus of interest [194,255,256,257]
The trend of the experimental to theoretical cross sections ratio Rs observed with cross sections deduced from configuration-interaction models such as the shell model, is well documented, comprising numerous data points spanning a wide range of separation-energy difference as well as incident beam energy of the projectile
Summary
The structure of nuclei and its evolution with the number of constituent nucleons, in particular with neutron-toproton asymmetry, has been a fascinating and multifaceted area in nuclear physics for a long time. On the quest to study the structural evolution of rare isotopes near the nucleon driplines, often only available for experiments as low-intensity, fast beams of ions with energies exceeding 50 MeV/nucleon, 9Be- or 12C-induced one-nucleon removal reactions have been introduced and developed by Gregers Hansen and the NSCL team for spectroscopy as a fast-beam, inverse-kinematics alternative to light-ion-induced transfer reactions that remove a nucleon from the nucleus of interest [194,255,256,257] For these one-nucleon removal reactions, the channel of interest is one where, in a single step, one proton or neutron is removed from the projectile and the projectile-like residue with A − 1 nucleons survives. The first experiments on (p, 2p) reactions were performed at the Berkeley laboratory using a 350 MeV proton beam [327,328]
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