出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The astrophysically-relevant region of the level structure of 19Ne around the proton threshold
remains incomplete when considering that analogs for several states in the mirror nucleus 19F
have not yet been identied in 19Ne. This structure is particularly important to understanding
the eventual fate of the long-lived radioisotope 18F in explosive environments like novae and xray
bursts, where rates of proton-induced reactions on 19F depend critically on the properties of
19Ne excited states above threshold. To study this system, a measurement of the 17O(3He;n)19Ne
reaction has been performed at Ohio University's Edwards Accelerator Laboratory, which features
a 4.5-MV tandem Van de Graaff accelerator. Utilizing pulsed beams and neutron time-of-ight
techniques, this experiment has been conducted at forward angles with a 3He beam energy of
4.2 MeV. This energy has been chosen such that the compound reaction model is the dominant
mechanism, which should ensure that this reaction will in principle populate all excited states
including any newly observed ones. In addition to precisely determining the excited energies
for individual levels, this measurement will provide experimental differential cross sections for
individual states that can be compared to calculations employing the Hauser-Feshbach statistical
model in an attempt to extract information on the spins of the excited states. The observed 19Ne
level structure from this reaction will be presented.
