Particle decay from the giant resonance region of 40Ca
Abstract
The reactions 40Ca(α, 2α)36Ar and 40Ca(α, αp)39K have been studied at 115-MeV bombarding energy in order to obtain the charged particle decay characteristics of the giant quadrupole resonance at Ex=18.0 MeV. Energy and angle were measured for both outgoing light particles to completely define the kinematics. Weak proton decay to the d32 (Γp0Γ=0.08+0.05-0.03) and s12 (Γp1Γ=0.22+0.05-0.08) hole states of 39K was observed from the giant quadrupole resonance while most of the decay proceeded to the region of the d52 hole states. While the (α, 2α) reaction populated the 36Ar ground state (O+), 1.97-MeV state (2+), and 4.18-4.44-MeV states (4+, 3-), only upper limits could be established for α decay of the giant quadrupole resonance (Γa0Γ<0.06). Significant decay of the 14-MeV L=2 state to the ground state of 36Ar was observed (Γa0Γ~0.9+/-0.2). NUCLEAR REACTIONS 40Ca(α, αp), (α, 2α), Eα=115 MeV; measured d4σdΩαdΩpdEαdEp,d4σdΩαdEαdEα, (α-p) angular correlation giant quadrupole resonance decay; deduced branching ratios, giant quadrupole resonance.
- Publication:
-
Physical Review C
- Pub Date:
- January 1977
- DOI:
- 10.1103/PhysRevC.15.246
- Bibcode:
- 1977PhRvC..15..246Y