Alpha particle scattering to negative parity states of14N

Abstract

Inelastic SHe scattering on melamine targets is studied for negative parity excitations of 14N. Eleven AL=3 excitations are presented, for states up to 15.41 MeV; three AL= 1 transitions are also studied. A microscopic DWBA calculation accounts for several of the octupole excitations, requiring an isoscalar effective strength about twice that expected for free alpha-nucleon scattering. Great purity of the structure of the three lowest 2-states is noted, with the 5.11 MeV and 9.13 MeV levels excited by AL=3, but with the 7.97 MeV state excited purely by AL = 1.Nuclear Reactions: 14N(4He, SHe'), E~=34.85 MeV; measured cr(E~, 0), deduced/3 and microscopic interaction strengths through DWBA.