Investigation of the 19Na via resonance elastic scattering

The structure of the unbound proton-rich isotope 19Na was studied in resonance elastic scattering of a radioactive 18Ne beam on a proton target using the thick-target inverse-kinematics method. The experiment covered excitation energy range from 0.5 to 2.7 MeV in c.m.s. Only one state of 19Na (the second excited state) was observed. A combined R-matrix and potential-model analysis was performed. The spin and parity assignment of this second excited state was confirmed to be 1/2+. We showthat the position of the 1/2+ state significantly affects the reaction rate through that state but the total reaction rate remains unchanged since the 18Ne(2p,gamma) proceeds mostly via the ground and first excited states in 19Na at stellar temperatures.Comment: 13 pages, 5 figure

Structure of N-12 using C-11+p resonance scattering

Journals published by the American Physical Society can be found at http://publish.aps.org/The level structure of N-12 has been investigated from 2.2 to 11.0 MeV in excitation energy using a C-11+p resonance interaction with thick targets and inverse kinematics. Excitation functions were fitted using an R-matrix approach. Sixteen levels in N-12 were included in the analysis, several of them are new. Spin-parity assignments, excitation energies and widths are proposed for these levels

Isobaric analog states of neutron-rich nuclei. Doppler shift as a measurement tool for resonance excitation functions

We present a new approach for the measurement of resonance excitation functions of neutron-rich nuclei using Doppler shift information. Preliminary data from the first application of the method is presented in the spectroscopy studies of 7 He isobaric analog states in 7 Li.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45815/1/10050_2005_Article_506014.pd

T=5/2 states in 9Li: Isobaric analog states of 9He

The thick target inverse kinematic method was applied to the study of isobaric analog states in the neutron-rich nucleus 9Li. For this purpose, an excitation function for 8He+p elastic scattering was measured in the center-of-momentum energy range from 1.6 to 5.8 MeV. Three T=5/2 states in 9Li (isobaric analogs of 9He) were observed. Restrictions on the spin-parity assignments are provided according to R-matrix calculations, and conclusions regarding the structure of 9He are given.peerReviewe