Nuclear data sheets for A = 89

Particle–core multiplets in89Y

“…Furthermore, the 3 17.6, 388.9 and 788.5 keV y-transitions display a dipole-like behaviour. In conclusion, we propose The levels known previously from the radioactivity works [9][10][11][12] and also observed in the present study are displayed in the lower right part. Our angular distribution results indicate a spin of 2 1 /2 for the 5309.5 keV state, but a unique parity assignment has not been possible.…”

“…In addition to the 1/2-ground state and the 9/2+ isomeric state several low-spin states are known from previous work [12]: the 312-at 1507.0keV, the 512-at 1745.0keV, the 512' at 2222.0 keV, the 712' at 2530.0 keV, the 9/2+ at 2622.2 keV and the 11/2+ at 2566.9 keV. These states are all seen in the present 87Rb(x, 2n) reaction.…”

“…Our starting point to understand the structure of the states in 89Y is based on the former descriptions [15-191 of the lowspin excitations. Thus the four lowest-lying states seen in the reaction [4,5,131 and radioactive decay [12] works are supposed to be mainly the single-particle shell-model states lying between the Z = 38 and Z = 40 gaps ( p 3 , , f s ,, pI , and g, 2 ) . In Ref.…”

Statistical model calculations for medium and strong absorption in theA=90 region

“…Under the heading Q(MeV), I n the level properties are listed channels is negligible, as shown by optical model calculations of the corresponding penetrabilities. The level scheme of 89y up to an excitation energy of 3.5 MeV was taken from the compilation [28]. At higher energy a "constant temperature" level density formula [29] has been employed.…”

A broken-pair description of89Y,91Nb and93Tc

“…and B(M1;l~'-- § in 8SSr. The experimental data are taken from [27,29,30] appear to be at least 25 percent too large). Since these data have been used in the parameter fit they are only a weak test on the model.…”