Proton scattering fromMg24at 0.8 GeV

Probing negative-parity states of Mg24 probed with proton and α inelastic scattering

“…The band structure of 24 Mg has been studied via electromagnetic transitions [1][2][3], and intensively investigated through inelastic scattering of various probes, including electrons [4][5][6][7][8][9][10], pions [11], nucleons [12][13][14][15][16][17][18][19][20][21][22][23], 3 He [24,25], and α [25][26][27][28][29]. For inelastic hadron scattering off 24 Mg, detailed reaction analyses have been performed using the distorted-wave Born approximation (DWBA) and coupled-channel (CC) calculations.…”

β-band excitation in inelastic hadron scattering and the mixing of the breathing mode into the low-lying β-vibrations

“…Moreover, attempts to fit the experimental 40 + MeV [10] and 20 MeV [11] (p, p') data for the 0/3 state of 24Mg with DWBA calculations using either macroscopic [ 10] (vibrating-diffuseness and breathing mode) form factors or microscopic [10,11 ] form factors failed. This failure could partly be attributed to strong coupled channel (CC) effects, since in the study of inelastic proton scattering from 24Mg at 0.8 GeV, Blanpied et al [12] concluded from a full CC analysis in the 0-vibrational model that the 0 + state at 6.43 MeV can not be described by a pure monopole/3-vibration form factor alone. CC effects on the excitation of the 0~ of 24Mg were studied earlier [13] using a wrong coupling scheme where the same form factor + was taken for the 0g s ~ 2 + and 2 + ~ 0/3 transitions but more importantly the 2~-state was omitted from the coupling scheme.…”

“…In this letter, we would like to present analysis of the ground state band (gsb) and/3-band, in 24Mg excited by inelastic hadron scattering [1,12,14] in a coupled scheme where proper coupling of the/3-band + to the gsb is included. Not only is the 20 angular distribution well explained (DWBA predictions are out-ofphase with the experimental data) in this scheme, but + also the 0/3 state can only be described by including in addition to the 0-vibration form factor a breathing mode form factor.…”

“…We have similarly analyzed the 800 MeV inelastic scattering data of ref. [12] using the reported [12] optical model parameters. Here the value of the deformation parameter/3~ was fixed to 0.637 by assuming the same scaling to the deformation parameter of the ground state (/32 = 0.601; ref.…”

“…Here the value of the deformation parameter/3~ was fixed to 0.637 by assuming the same scaling to the deformation parameter of the ground state (/32 = 0.601; ref. [12] as was obtained from the analysis of the 24Mg(ct, a')24Mg data. The X 2-+ differen-search resulted in a rather good fit to the 0# tial cross section (not shown here), with I/3 -r2 I = 0.122 and/30 = -0.051 leading to a monopole matrix element, again using Bernstein procedure [17], of 5.9 fm 2 .…”