T. N. Buti

Neutron transition density for the lowest 2+ state of 18O

Abstract Scattering of 135 MeV protons is used to fit an expansion in radial basis functions of the neutron transition density for the lowest 2 + state of 18 O. The narrow error envelope shows good radial sensitivity. The results are consistent with electromagnetic decay data for the mirror transition in 18 Ne.

Cross section and analyzing power for the isovector “stretched” 6− state in the 28Si(p, n)28P reaction

Abstract We studied the 28 Si(p, n) reaction with both unpolarized and polarized protons at a nominal energy of 135 MeV, extracted the angular distributions of the differential cross section and the analyzing power for the 6 − , T = 1 state at an excitation energy of 4.95 MeV in 28 P, and compared our results with similar data published for the analog ( p , p ′) reaction to the 6 − , T = 1 state at an excitation energy of 14.35 MeV in 28 Si. These comparisons are consistent with charge independence. The measurements are described well by distorted-wave-impulse-approximation calculations with form factors and spectroscopic amplitudes determined from electron scattering.

Electron scattering from sup 9 Be

The structure of {sup 9}Be is investigated using electron scattering measurements at 90{degree} and 160{degree} for momentum transfers between about 1.0 and 2.5 fm{sup {minus}1}. In addition to the 3/2{sup {minus}} ground state and the narrow 5/2{sup {minus}} state at 2.43 MeV, detailed line-shape analysis was used to extract cross sections for broad states at 1.68, 3.05, 4.70, 6.38, 6.76, 11.28, and 13.79 MeV. The previously unknown state at 6.38 MeV was isolated from the known 6.76 MeV state in both ({ital e},{ital e}{prime}) and ({ital p},{ital p}{prime}) data using the dependence of peak position upon momentum transfer. On the basis of the form factor, the 6.38 MeV state replaces the 6.76 MeV state as the 7/2{sup {minus}} member of the ground-state rotational band and the 6.76 MeV state is identified with the lowest 9/2{sup +} state predicted by the shell model. The data for all states are compared with a shell-model calculation that uses the full 0{h bar}{omega} and 1{h bar}{omega} model spaces. Calculations are also presented for the narrow states between 14 and 18 MeV excitation.

Electron scattering fromBe9

The structure of {sup 9}Be is investigated using electron scattering measurements at 90{degree} and 160{degree} for momentum transfers between about 1.0 and 2.5 fm{sup {minus}1}. In addition to the 3/2{sup {minus}} ground state and the narrow 5/2{sup {minus}} state at 2.43 MeV, detailed line-shape analysis was used to extract cross sections for broad states at 1.68, 3.05, 4.70, 6.38, 6.76, 11.28, and 13.79 MeV. The previously unknown state at 6.38 MeV was isolated from the known 6.76 MeV state in both ({ital e},{ital e}{prime}) and ({ital p},{ital p}{prime}) data using the dependence of peak position upon momentum transfer. On the basis of the form factor, the 6.38 MeV state replaces the 6.76 MeV state as the 7/2{sup {minus}} member of the ground-state rotational band and the 6.76 MeV state is identified with the lowest 9/2{sup +} state predicted by the shell model. The data for all states are compared with a shell-model calculation that uses the full 0{h bar}{omega} and 1{h bar}{omega} model spaces. Calculations are also presented for the narrow states between 14 and 18 MeV excitation.

Electron scattering from Be 9

The structure of {sup 9}Be is investigated using electron scattering measurements at 90{degree} and 160{degree} for momentum transfers between about 1.0 and 2.5 fm{sup {minus}1}. In addition to the 3/2{sup {minus}} ground state and the narrow 5/2{sup {minus}} state at 2.43 MeV, detailed line-shape analysis was used to extract cross sections for broad states at 1.68, 3.05, 4.70, 6.38, 6.76, 11.28, and 13.79 MeV. The previously unknown state at 6.38 MeV was isolated from the known 6.76 MeV state in both ({ital e},{ital e}{prime}) and ({ital p},{ital p}{prime}) data using the dependence of peak position upon momentum transfer. On the basis of the form factor, the 6.38 MeV state replaces the 6.76 MeV state as the 7/2{sup {minus}} member of the ground-state rotational band and the 6.76 MeV state is identified with the lowest 9/2{sup +} state predicted by the shell model. The data for all states are compared with a shell-model calculation that uses the full 0{h bar}{omega} and 1{h bar}{omega} model spaces. Calculations are also presented for the narrow states between 14 and 18 MeV excitation.