Single-proton transfer reactions on N = 50 nuclei

Gamma-ray spectroscopy of87Y

“…The prominence of E2 transitions in the positive parity cascade in 87y suggests that the addition of the 4h units of angular momentum carried by the g9/2 proton into the seniority-three configuration gives rise to a small quadrupole deformation at higher excitation and spin which is not present in the ~(pl/2)v(g9/2) -2 configuration. [27] to lie between 1.5 and 2.0 MeV above the ground state in 89y; from the considerations mentioned at the beginning of this section they can be expected to lie somewhat lower in 87y. It is thus not at all surprising that states above 3 MeV should involve particle-hole interactions with these proton orbitals.…”

The low-lying level structure of87Rb

“…Until 1972 STKr decay [1,2] was the source of most of the level structure of SVRb. Since then, (n,n'7) [3,4], (p,p') [5], Coulomb excitation [6], SSSr(d, 3He) [7,8], and S6Kr(3He, d) [9,10] experiments have confirmed much of the early structure information and added new information. As a result of these experiments, the energy levels of STRb and the spins, parities, and spectroscopic factors for the lowest lying levels have become reasonably well known.…”

“…The single particle transfer reaction data [7][8][9][10] and the scattering data [3][4][5] indicate the presence of coupling between the proton and collective motions of the core. The data of [7,10] and the 8VRb(d, 3He) experiment [15] also show that thefs/2, P3/2, and Pl/2 single particle orbitals are partially open. In the present study, the low-lying levels of 87Rb are analyzed in an intermediate quasiparticle-core coupling model which couples the single proton motion in the lf5/2, 2p3/2 , 2pl/2, and lg9/2 orbitals to the ground and 2 + first excited states of the neighboring even nucleus.…”

“…The present theoretical study has been prompted by the accumulation of experimental data for this nucleus and the little theoretical information available [2,11]. The single particle transfer reaction data [7][8][9][10] and the scattering data [3][4][5] indicate the presence of coupling between the proton and collective motions of the core. The data of [7,10] and the 8VRb(d, 3He) experiment [15] also show that thefs/2, P3/2, and Pl/2 single particle orbitals are partially open.…”

The level structure of85Rb and87Rb from (n, n??) reaction measurements

“…The doubly magic nucleus 9~ is frequently considered as an inert core while it has been suggested [1,2], and reasonably successful calculations have been made on the assumption, that SSSr (Z=38) is a better doubly-closed-shell nucleus than 9~ [3,4]. The level structure of 87Rb might then be understood as originating from the weak coupling of a proton-hole to the 88Sr core, with the recognition that proton stripping [5] and pick-up [6] reactions on 88Sr are not fully consistent with this assumption of filled proton p 3/2 and f5/2 orbitals in the ground state. This configuration mixing is further established by the results from (d, 3He) studies [7] and from (t9, p') results.…”