(d,He3) Studies onZr

Abstract

The (d,He 8 ) reaction on Zr 90 , Y 89 , and Sr 88 has been studied with 21-MeV deuterons from the University of Washington cyclotron. Angular distributions were obtained for transitions leading to the ground state and the 0.906-, 1.51-, and 1.75-MeV states of Y 89 , the ground state and the 1.84-, 3.21-, 3.48-, and 3.64-MeV states of Sr 88 , and to the ground state and the 0.403-, and 0.847-MeV states of Rb 87 over the laboratory angular interval 15°-65°. The angular distributions were compared with predictions from a distorted-wave Born-approximation (DWBA) calculation, and spectroscopic factors were obtained. The I values of 1 and 3 were assigned to the transitions to the 3.48-and 3.64-MeV states of Sr 88 , respectively, for which the spins and parities were not previously known. On the basis of the DWBA analysis, large fractions of the (2^3/2) _1 and (I/5/2)-" 1 proton hole strengths are assigned to the first few excited states of Y 89 , Sr 88 , and Rb 87 , in qualitative agreement with simple shell-model predictions.

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

“…We have attempted to establish the level structures and determine level parameters for 85Rb and 87Rb up to 2 MeV excitation. The low-lying levels of 87Rb have been studied previously using beta decay [9 11], inelastic proton scattering [12], pick-up reactions [6,13] and stripping reactions [14,15], coulomb excitation [16,17] and inelastic neutron scattering [18,19]. The present measurements are generally in good agreement with these data whilst resolving a few ambiguities in addition.…”

(d,He3) Reactions on the Even Zirconium Isotopes

“…Pickup reactions are a sensitive tool for investigating target ground-state wave functions and, in most cases, will reveal admixtures of single-particle configurations. Recent examples of the proton pickup reaction are the (n,d)* (^He), [4][5][6][7] and (t,a) 8 …”

Precise Energies ofCa40Levels

“…The use of high resolution and an isotopically pure target has enabled 73 levels to be observed up to 8.516-MeV excitation in Sr 88 . The level structure and spectroscopic information extracted have been compared to data on Sr 88 reported previously by other investigators 4 The levels of Sr 88 have been studied with the Sr 87 (<#,^)Sr 88 reaction at a bombarding energy of 7.5 MeV using the MIT-ONR Van de Graaff generator and multiple-gap spectrograph. Seventy-three levels below 8.516-MeV excitation were observed, 32 of which displayed direct-stripping angular distributions.…”

“…The development of Ge(Li) detectors has made y-ray measurements an ideal method for determining the energies of certain analog levels. A number of authors [3][4][5][6] have used such techniques to obtain the energy of the lowest T=l level of 40 Ca, and a 41 K( 3 He,d) 40 Ca charged-particle spectrograph result of comparable accuracy has also been reported. 7 Since Armini, Sunier, and Richardson, 6 whose result for that level is E x = 7669.1 ±3.3, have questioned the precision of the Berg and Kashy 5 value of E x = 7660.8±1.2, and in view of the significant difference between the two results, the present work was undertaken.…”