One-neutron removal reactions on neutron-rich psd-shell nuclei
نویسندگان
چکیده
A systematic study of high energy, one-neutron removal reactions on 23 neutronrich, psd–shell nuclei (Z = 5−9, A = 12−25) has been carried out. The longitudinal momentum distributions of the core fragments and corresponding single-neutron removal cross sections are reported for reactions on a carbon target. Extended Glauber model calculations, weighted by the spectroscopic factors obtained from shell model calculations, are compared to the experimental results. Conclusions are drawn regarding the use of such reactions as a spectroscopic tool and spin-parity assignments are proposed for B, C, 19−21N, 21,23O, 23−25F. The nature of the weakly bound systems B and 15,17C is discussed. PACS: 25.60.-t, 25.60.Gc, 27.20.+n, 27.30.+t
منابع مشابه
Two-proton knockout on neutron-rich nuclei
Two-proton knockout reactions on neutron-rich nuclei [1] have been studied in inverse kinematics at intermediate energy. Strong evidence that the two-proton removal from a neutron-rich system proceeds as a direct reaction is presented, together with a preliminary theoretical discussion of the partial cross sections based on eikonal reaction theory and the many-body shell model. They show that t...
متن کاملNew way for the production of heavy neutron-rich nuclei
A new way is found to discover and examine unknown neutron-rich heavy nuclei at the ‘north-east’ part of the nuclear map. This ‘blank spot’ of the nuclear map can be reached neither in fusion–fission reactions nor in fragmentation processes widely used nowadays for the production of new nuclei. The present limits of the upper part of the nuclear map are very close to stability while the unexplo...
متن کاملDiffraction dissociation contributions to two-nucleon knockout reactions and the suppression of shell-model strength
The contributions to the cross sections of intermediate energy two-nucleon knockout reactions from events in which one nucleon is removed by the stripping (inelastic breakup) mechanism and a second by the diffraction (elastic breakup) mechanism are discussed. The small additional contributions from two-nucleon diffraction events are also estimated. The approach used combines the eikonal reactio...
متن کاملDirect evidence for the onset of intruder configurations in neutron-rich Ne isotopes
Monte Carlo shell-model calculations with the modern SDPF-M interaction successfully describe neutron-rich nuclei in the vicinity of N = 20 where normal and intruder configurations coexist at low excitation energy. We report on direct experimental evidence of the population of the 3/2− intruder state in 27Ne in the knockout of a single neutron from the ground state of 28Ne. This low-lying negat...
متن کاملRelativistic mean - field study of light nuclei near drip line
The relativistic mean field theory is applied to study some exotic properties of neutron rich nuclei as recently observed, namely, extension of the drip-line for F nuclei from 29 F to 31 F and the appearence of a new shell closure at neutron number N = 16. We find 31 F to be bound against one-neutron dripping but unbound only marginally for two neutron separation. The calculated functional depe...
متن کامل