B.L. Burks

Alpha-particle D-state and configuration-mixing effects in the 89Y(d, α)87Sr reaction

Abstract Angular distributions of cross sections and vector and tensor analyzing powers have been measured for low-lying levels populated by 89 Y(d, α) 87 Sr reaction at 9.0, 12.0, and 16.0 MeV. Full finite-range DWBA calculations that include the effects of an α-particle D-state component and ( L , J ) mixing have been performed. The ground-state transition indicates that the D-state parameter D 2 = −0.30 ± 0.1 fm 2 . The angular distributions of the tensor analyzing powers are very sensitive to the magnitude and sign of the mixing amplitudes and can be used to determine the neutron-proton configurations transferred. The mixing amplitudes for the 0.388 MeV and 0.873 MeV states in 87 Sr are established from the analysis.

Investigation of the reactions 58Ni(d, α)56Co and 50Ti(d, α)48Sc with vector and tensor polarized deuterons

Abstract Angular distributions of the cross section, and vector and tensor analyzing powers have been measured for the 58 Ni(d, α) 56 Co and 50 Ti(d, α) 48 Sc reactions at E d = 16 MeV. The L - and J -dependence of the vector and tensor analyzing powers allows J π assignments for some low-lying states in the final nuclei. Using optical potentials with matching geometry good DWBA descriptions of all observables could be achieved.

Spins and parities of low-lying states in 79Kr from the 78Kr(d, p)79Kr reaction☆

Abstract The differential cross sections and vector analyzing powers for the 78 Kr ( d , t ) 77 Kr reaction leading to low-lying states of 77 Kr have been measured at an incident deuteron energy of 15.95 MeV. These data have been compared with distorted-wave Born approximation calculations, as well as with measurements of cross sections and analyzing powers on neighboring nuclei, in order to determine the spins and parities of these states and the spectroscopic factors for the transitions populating them. The ground state of 77 Kr, which had been the object of several conflicting spin assignments, has been found to have J π = 5 2 + .

A DWBA analysis of the 86Sr(d, p)87Sr reaction and implications for a 87Rb solar neutrino detector☆

Abstract The structure of 87 Sr has been investigated via the 86 Sr ( d , p ) 87 Sr reaction using an 11.0 MeV vector-polarized deuteron beam. Differential cross sections and vector analyzing powers have been measured from 20° to 105° for 18 excited states below 4 MeV excitation energy. Comparisons of these distributions to DWBA calculations and empirical shapes were made to extract neutron spectroscopic factors and values of spin and parity for these states. Two states were identified in 87 Sr below 4.0 MeV in excitation energy that would be populated by allowed solar neutrino captures in a 87 Rb solar neutrino detector.

Spins and parities of low-lying states in 81Kr from the 80kr(d̄, p)81kr reaction and implications for a 81Br solar neutrino detector☆

Abstract The structure of 81Kr has been investigated via the 80Kr(d, p)81Kr reaction using an 11.0 MeV vector-polarized deuteron beam. Differential cross sections σ and vector analyzing powers Ay have been measured from 20° to 90° for 17 excited states below 3.0 MeV excitation energy. Comparisons of these distributions to DWBA calculations and empirical shapes were made to extract spectroscopic factors and values of spin and parity for these states. The significance of these measurements to the design of a bromine solar neutrino detector is discussed.

Measurement and DWBA analysis of the 78Kr(d↘,p)79Kr reaction

The structure of 79Kr has been investigated via the 78Kr(d,p)79Kr reaction using an isotopically enriched gas target and an 11‐MeV vector‐polarized deuteron beam. Differential cross sections, σ, and vector analyzing powers, Ay, have been measured from 25° to 95° for 10 proton groups below 2.5 MeV. Comparisons of these distributions to DWBA calculations were made to extract spectroscopic factors and values of spin (J) parity (π) for these states.

Polarized proton scattering from Se isotopes

Elastic‐scattering data for ASe(p,p) ASe with A=76,78,80,82 at 12 MeV are reported for the scattering‐angle range 27.5° to 167.5°. The data are compared with predictions from a global optical‐model potential and with a deformed‐potential calculation which uses parameters consistent with neutron scattering from the same isotopes.

A test of collective effects in Se(d,d)Se

Deuteron elastic and inelastic scattering from the Se isotopes with A=76, 78, 80, 82 has been used to test the suggestion that the change in elastic‐scattering vector analyzing powers can be attributed to changing collectivity of these isotopes with A.