An above-barrier narrow resonance in F-15
Authorsde Grancey, F.
Santos, F. de Oliveira
Angelique, J. C.
Čeliković, Igor T.
Daugas, J. M.
Pellegriti, M. G.
Saint Laurent, M. G.
Subotić, Krunoslav M.
Thomas, J. C.
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Intense and purified radioactive beam of post-accelerated O-14 was used to study the low-lying states in the unbound F-15 nucleus. Exploiting resonant elastic scattering in inverse kinematics with a thick target, the second excited state, a resonance at E-R = 4.757(6)(10) MeV with a width of Gamma = 36(5)(14) keV was measured for the first time with high precision. The structure of this narrow above-barrier state in a nucleus located two neutrons beyond the proton drip line was investigated using the Gamow Shell Model in the coupled channel representation with a C-12 core and three valence protons. It is found that it is an almost pure wave function of two quasi-bound protons in the 2s(1/2) shell. (C) 2016 The Authors. Published by Elsevier B.V.
Keywords:Resonances / Elastic proton scattering, lifetimes, width / F-15 / Unbound states / Overbarrier resonance
Source:Physics Letters B, 2016, 758, 26-31
- Nuclear physics, methods and application (RS-171018)
- European Community [RII3-CT-2004-506065], COPIN, COPIGAL French-Polish scientific exchange programs, France-Romanian IN2P3-IFIN-HH [03-33], France-Czech LEA NuAG collaboration, Helmholtz Association (HGF) through the Nuclear Astrophysics Virtual Institute (NAVI), French-Serbian collaboration