Investigation of 89Y and 87Rb by (p, p′) reactions

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 calculation predicts a 1/2-assignment for the state observed at 1893keV and from stripping strength considerations favors J~= 1/2-rather than 3/2-for the state at 2396keV. There is also a calculated 5/2-state at 1793 keV which may correspond to the state observed at 1740 _+_ 1 keV in 87Kr decay and the scattering experiments [3][4][5] and which is assigned J~=(5/2-). This state (1740keV) is not seen in the stripping reaction [10] but this may be partially explained by the small calculated strength and the fact that it is expected to be weak in this reaction.…”

“…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. In particular, the studies [5,9] seem to have resolved a discrepancy in the location of the g9/2 proton single particle state of this nucleus. Only limited theoretical calculations [2,11] have been reported to account for the STRb data although there are recent theoretical calculations [12][13][14][15] for other Rb isotopes.…”

“…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.…”

Nuclear spectroscopy of90Y

“…These states might have proton configurations which involve the promotion of a proton from the p~ orbital into the g9 orbital. This two particle-one hole proton structure has been suggested for the positive parity states that occur in S9y at 2.5 MeV [18] and should produce many levels in 9oy. The state at 2,366.2 keV is weakly populated in the S9y(d,p)9~ reaction with an angular distribution corresponding to l= 0.…”