Absolute cross-section measurements for ionization of He Rydberg atoms in collisions with K

Abstract

Absolute cross sections for ionization of 1.5 -10.0 keV/amu Rydberg helium atoms in principal quantum states 12~n~15 due to collisions with potassium have been measured. The data are compared with the free-electron cross section at equal velocity. Our results for the collisional ionization cross sections (o;) agree both in shape and absolute magnitude with the data available for the total electron-scattering cross sections (o. ,) and support recent theoretical models for ionization of Rydberg atoms with neutral perturbers. PACS number(s): 34.50.s, 34.80.i, 34.60.+z

Intruder states in very neutron-deficient Hg, Pb and Po nuclei

“…The placement and the cascade character of the 529.9 and 400.9 keV γ rays remain tentative. N 126 taken from [15,16,[22][23][24][25][26][27][28][29][30][31][32][33] and this paper. The excitation energies of the 2 + , 4 + , 6 + and 8 + levels for the even-N isotopes are plotted together with the energies of the 17/2 + , 21/2 + , 25/2 + and 29/2 + levels relative to the lowest-lying 13/2 + states in odd-N isotopes.…”

“…The procedure used in section 2.2.2 to determine the unperturbed band-head energies Figure 17. Plots of aligned angular momentum, i x , as a function of rotational frequency, hω, for 182,184 Pb (this work), 186,188 Pb [48,49] and 180,182,184,186 Hg [15,16,23,24]. Rotational references with Harris parameters of J 0 = 27h 2 MeV −1 and J 1 = 199h 4 MeV −3 have been subtracted.…”