P. L. Hallowell

Inelastic electron scattering at 180° from 14C☆

Abstract Inelastic scattering of 37, 50, and 60 MeV electrons at 180° from 14 C has been studied. Cross sections for the excitation of eight states in 14 C with excitation energy less than 16 MeV have been observed. Most of the strength is observed to be concentrated in one transition at 11.31 MeV which is assigned a spin and parity of 1 + . The total width of this state is observed to be 207 ± 13 keV, while the electromagnetic transition width is determined to be 6.8 ± 1.4 eV.

Elastic electron scattering from the isotopes 36Ar and 40Ar

Abstract The charge structure of 36 Ar and 40 Ar has been investigated using the technique of elastic electron scattering. Data were collected at the National Bureau of Standards Linear Accelerator with incident electron energies ranging from 65 to 115 MeV and a scattering angle of 110°. The data span a range of q 2 between 0.29 and 0.92 fm −2 . Phase shift fits to a two-parameter Fermi distribution yield model dependent rms charge-radius values of 3.33 ±0.02 fm for 36 Ar and 3.39 ± 0.02 fm for 40 Ar, where the quoted uncertainties are statistical only. These values are compared with the results of previous experiments on these nuclei.

Inelastic electron scattering from low-lying states in the nuclei 36Ar and 40Ar☆

Abstract The low-lying level structure of 36 Ar and 40 Ar has been investigated using the technique of inelastic electron scattering. Data were collected at the National Bureau of Standards Linear Accelerator with incident electron energies between 65 and 115 MeV and scattering angles of 92.5° and 110°. The data span a range of momentum transfer squared between 0.29 and 0.92 fm −2 . Tassie model and Helm model analyses have been applied to data for levels at 1.97 and 4.18 MeV in 36 Ar and at 1.46, 2.52, 3.21 and 3.68 MeV in 40 Ar. A 2 + assignment to the 3.21 MeV state in 40 Ar is suggested. Transition strengths, transition radii, and mean lifetimes for these states are computed and compared with results of previous experiments.

A low-volume, high-pressure gas target for use in electron-scattering experiments

Abstract A thin-window, low-volume, high-pressure gas-target cell suitable for use in high-resolution electron-scattering investigations is described. Details of the design and construction as well as the results of several tests are discussed.

Search for the lowestT = 2 state in14C by inelastic electron scattering

SummaryA search for the lowest-energyT = 2 state in14C has been attempted employing inelastic electron scattering techniques. Spectra obtained at 61 and 81 MeV incident-electron energy and 145.7° scattering angle fail to reveal significant structure at the predicted resonance energy. The implications of this result are discussed in terms of the particle-hole model and the ground-state structure of the14B analogue of this level.RiassuntoSi è cercato di condurre una ricerca dello stato di energia minimaT = 2 nel14C servendosi delle tecniche di scattering anelastico degli elettroni. Negli spettri ottenuti per valori dell’energia degli elettroni incidenti di 61 e 81 MeV e dell’angolo di scattering di 145.7°, non si riescono a scorgere strutture significative ai previsti valori dell’energia di risonanza. Si discutono le implicazioni di questo risultato alla luce del modello a particelle e lacune e della struttura dello stato fondamentale dell’analogo di questo livello nel14B.РеэюмеИспольэуя технику неупругого рассеяния злектронов, исследуется состояниеT = 2 с наименьщей знергией в14C. Полученные спектры при знергии падаюших злектронов 61 и 81 МзВ при угле рассеяния 145.7° не обнаруживают сушественной структуры при предскаэанной реэонансной знергии. Полученный реэультат обсуждается с помошью модели ? частица-дырка ? и структуры основного состояния для14B аналога зтого уровня.

Search for the lowest T = 2 state in 14 C by inelastic electron scattering

SummaryA search for the lowest-energyT = 2 state in14C has been attempted employing inelastic electron scattering techniques. Spectra obtained at 61 and 81 MeV incident-electron energy and 145.7° scattering angle fail to reveal significant structure at the predicted resonance energy. The implications of this result are discussed in terms of the particle-hole model and the ground-state structure of the14B analogue of this level.RiassuntoSi è cercato di condurre una ricerca dello stato di energia minimaT = 2 nel14C servendosi delle tecniche di scattering anelastico degli elettroni. Negli spettri ottenuti per valori dell’energia degli elettroni incidenti di 61 e 81 MeV e dell’angolo di scattering di 145.7°, non si riescono a scorgere strutture significative ai previsti valori dell’energia di risonanza. Si discutono le implicazioni di questo risultato alla luce del modello a particelle e lacune e della struttura dello stato fondamentale dell’analogo di questo livello nel14B.РеэюмеИспольэуя технику неупругого рассеяния злектронов, исследуется состояниеT = 2 с наименьщей знергией в14C. Полученные спектры при знергии падаюших злектронов 61 и 81 МзВ при угле рассеяния 145.7° не обнаруживают сушественной структуры при предскаэанной реэонансной знергии. Полученный реэультат обсуждается с помошью модели ? частица-дырка ? и структуры основного состояния для14B аналога зтого уровня.

Search for the lowestT = 2 state in14C by inelastic electron scattering@@@Исследование ниэщего состоянияT=2 в14C с помошью неупругого рассеяния злектронов

SummaryA search for the lowest-energyT = 2 state in14C has been attempted employing inelastic electron scattering techniques. Spectra obtained at 61 and 81 MeV incident-electron energy and 145.7° scattering angle fail to reveal significant structure at the predicted resonance energy. The implications of this result are discussed in terms of the particle-hole model and the ground-state structure of the14B analogue of this level.RiassuntoSi è cercato di condurre una ricerca dello stato di energia minimaT = 2 nel14C servendosi delle tecniche di scattering anelastico degli elettroni. Negli spettri ottenuti per valori dell’energia degli elettroni incidenti di 61 e 81 MeV e dell’angolo di scattering di 145.7°, non si riescono a scorgere strutture significative ai previsti valori dell’energia di risonanza. Si discutono le implicazioni di questo risultato alla luce del modello a particelle e lacune e della struttura dello stato fondamentale dell’analogo di questo livello nel14B.РеэюмеИспольэуя технику неупругого рассеяния злектронов, исследуется состояниеT = 2 с наименьщей знергией в14C. Полученные спектры при знергии падаюших злектронов 61 и 81 МзВ при угле рассеяния 145.7° не обнаруживают сушественной структуры при предскаэанной реэонансной знергии. Полученный реэультат обсуждается с помошью модели ? частица-дырка ? и структуры основного состояния для14B аналога зтого уровня.