Thick-target inverse-kinematics proton scattering from Ar-46 and the N=28 shell below Ca-48

Riley, LA; Abdelqader, MA; Bazin, D; Bojazi, MJ; Brown, BA; Campbell, CM; Church, JA; Cottle, PD; Dinca, DC; Enders, J; Gade, A; Glasmacher, T; Honma, M; Horibe, S; Hu, Z; Kemper, KW; Mueller, WF; Olliver, H; Otsuka, Taka; Perry, BC; Roeder, BT; Sherrill, BM; Spencer, TP; Terry, JR

doi:10.1103/PhysRevC.72.024311

Thick-target inverse-kinematics proton scattering from Ar-46 and the N=28 shell below Ca-48

Author:

Riley, LA

Abdelqader, MA ; Bazin, D ; Bojazi, MJ ; Brown, BA ; Campbell, CM ; Church, JA ; Cottle, PD ; Dinca, DC ; Enders, J ; Gade, A ; Glasmacher, T ; Honma, M ; Horibe, S ; Hu, Z ; Kemper, KW ; Mueller, WF ; Olliver, H ; Otsuka, Taka ; Perry, BC ; Roeder, BT ; Sherrill, BM ; Spencer, TP ; Terry, JR

Keywords:

Science & Technology, Physical Sciences, Physics, Nuclear, Physics, NEUTRON-RICH NUCLEI, INELASTIC-SCATTERING, COULOMB-EXCITATION, ISOTOPES, MODEL, DEFORMATION, STATES, BEAMS, TI-46, BETA, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

Low-lying excited states of 46 Ar have been studied via inverse-kinematics proton scattering with a thick target. Coupled-channels calculations have been used to extract the deformation length of the 2 + 1 state. This result, combined with existing Coulomb excitation data, yields a ratio of the neutron-to-proton transition matrix elements of M n /M p = 1 . 19(25) N/Z , showing a departure from the proton dominance observed in the N = 28 isotones above 48 Ca. The status of the N = 28 shell below 48 Ca is discussed