N. M. Clarke

Optical model analyses of 6,7Li + 208Pb elastic scattering near the Coulomb barrier

The elastic scattering of 6Li and 7Li by 208Pb has been measured at several energies near the Coulomb barrier and analysed in terms of the optical model. Previous reports have suggested that the normalization factor, NR, for the double-folded real potential is approximately 0.6 for both isotopes at bombarding energies well above the Coulomb barrier. In this paper we show that, whereas this low value for NR persists for 6Li at energies close to the barrier, for 7Li it is somewhat greater than unity, and indicates the existence of a threshold anomaly for this projectile.

One-neutron removal reactions on neutron-rich psd-shell nuclei

Abstract A systematic study of high energy, one-neutron removal reactions on 23 neutron-rich, 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 15 B, 17 C, 19–21 N, 21,23 O, 23–25 F. The nature of the weakly bound systems 14 B and 15,17 C is discussed.

Structure of Be-12: Intruder d-wave strength at N=8

The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.

Two-neutron interferometry as a probe of the nuclear halo

The technique of intensity interferometry is proposed as a probe of the spatial configuration of two-Neutron haloes. After exploring the sensitivity of interferometry to the n-N configuration, it is demonstrated that the application of the standard method for constructing the correlation function is not valid for halo neutrons. A new iterative method is presented and applied to measurements of the dissociation of 6He, 11Li and 14Be. The correlation functions for these systems have thus been extracted for the first time and the corresponding root-Mean-Square n-n separations estimated. The results are in agreement with the predictions of available three-Body models

Three-body correlations in Borromean halo nuclei

Three-body correlations in the dissociation of Borromean halo nuclei are explored for the first time using a technique based on intensity interferometry and Dalitz plots. As an example, the breakup of

Neutrons from the breakup of C-19

^{14}

The threshold anomaly in the 16O + 58,60,62,64Ni systems

Be into

4 He Decay of Excited States in 14 C

^{12}

Single-proton removal reaction study of 16B

Be+n+n by Pb and C targets is analysed. The combined treatment of n-n and core-n correlations permitted the halo n-n separation to be deduced together with the characteristics

Radiative proton capture on (^6)He

(E,\tau)