“Theoretical and experimental studies of 10He and 17Ne excitation spectra”

19.02.2018 – FLNR Scientific Seminar “Theoretical and experimental studies of ¹⁰He and ¹⁷Ne excitation spectra”, 15-30, Flerov Lab Conference Hall

Speaker: P.G.Sharov, (on Candidate’s thesis)

This work concerns two actual problems which hold central positions in ACCULINNA fragment separator light exotic nuclei studies.

When populated in different reactions ¹⁰He has a peak at ~1-3 MeV which is usually interpreted as its ground state. Calculations of ¹⁰He spectrum in three-body model within the hyperspherical harmonic method and study of reaction mechanism showed how the ground state properties effect ¹⁰He spectra formation in ⁸He (FLNR), ¹¹Li (RIKEN, GSI) and ¹⁴Be (MSU) reactions. It resulted in revision of ¹⁰He ground state value at decay energy MeV.

A rare 2p-decay branch of ¹⁷Ne(3/2^–) first excited state was studied in p(¹⁸Ne,d)¹⁷Ne* reaction. This decay branch partial width is necessary to find the probability of inverse process of simultaneous two-proton capture which is a bypass for ¹⁵O waiting point in CNO-cycle of nucleosynthesis. Combined mass method and correlation analysis of missing and combined mass spectra were applied to settle the problem. New method 50 times lowered conventional limit of two-proton and gamma decay widths ratio of ¹⁷Ne studied state. This work shows prospects of the method for study of rare decay branches of exotic nuclei. Their properties are important for understanding of nuclear reaction important for astrophysics.