A New Uniform Calibration Method for Double-Sided Silicon Strip Detectors
We proposed and implemented a new uniform calibration approach for double-sided silicon strip detector, named the self-calibration method (SCM). This method uses the strips on one side of the detector as references, to calibrate the strips on the other side, and vice versa. This calibration method has the inherent advantages that it can be run during the experiment corresponding exactly to the required particle type and energy range, and provides good statistics based on flexible selection of the event samples. Two strategies based on the same working principle but with deferent complexities, named simple SCM and overall SCM, were introduced and examined experimentally. The simple SCM requires less computation but a large number of events, while the overall SCM exhibits excellent performance even with a relatively small number of events.
Single-nucleon transfer reactions on 18 F
Simultaneous measurement of the proton-transfer {sup 18}F(d, n){sup 19}Ne and neutron-transfer {sup 18}F(d, p){sup 19}F reactions were performed with a {sup 18}F radioactive beam at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The experiments clarify the nuclear structure of {sup 19}Ne near the proton threshold, which is relevant for understanding the rates of proton-induced reactions on {sup 18}F in novae. Analogs for several states in the mirror nucleus {sup 19}F have not yet been identified in {sup 19}Ne, indicating that the level structure of {sup 19}Ne in this region is incomplete. We observed 15 levels in {sup 19}Ne from the {sup 18}F(d, n){sup 19}Ne measurement and 18 levels in {sup 19}F from the {sup 18}F(d, p){sup 19}F measurement. Angular distributions were extracted for all strongly populated states and compared to distorted-wave Born approximation calculations. The angular distributions for all the known states in the two nuclei determined in this work are consistent with their previously assigned spins and parities. The spectroscopic factors determined for these levels in the two nuclei are reported.
The R-matrix theory
The different facets of the R-matrix method are presented pedagogically in a general framework. Two variants have been developed over the years: (i) The ‘calculable’ R-matrix method is a calculational tool to derive scattering properties from the Schrödinger equation in a large variety of physical problems. It was developed rather independently in atomic and nuclear physics with too little mutual influence. (ii) The ‘phenomenological’ R-matrix method is a technique to parametrize various types of cross sections. It was mainly (or uniquely) used in nuclear physics. Both directions are explained by starting from the simple problem of scattering by a potential. They are illustrated by simple examples in nuclear and atomic physics. In addition to elastic scattering, the R-matrix formalism is applied to inelastic and radiative-capture reactions. We also present more recent and more ambitious applications of the theory in nuclear physics.