Observation of High-Lying Levels in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Be</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>8</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi><mo>−</mo><mi>α</mi></math></span> Elastic Scattering

A. D. Bacher; F. G. Resmini; H. E. Conzett; R. de Swiniarski; H. Meiner; J. Ernst

doi:10.1103/PhysRevLett.29.1331

Observation of High-Lying Levels in ${}^{8}{Be}$ from $α - α$ Elastic Scattering

A. D. Bacher, F. G. Resmini, H. E. Conzett, R. de Swiniarski, H. Meiner, and J. Ernst

Phys. Rev. Lett. 29, 1331 – Published 6 November 1972

Abstract

The elastic scattering of $α$ particles from ${}^{4}{He}$ has been measured in the energy range between 30 and 70 MeV. A phase-shift analysis was used to investigate the even-spin, positive-parity levels in ${}^{8}{Be}$ in the region between 15 and 35 MeV of excitation. New $0^{+}$ and $4^{+}$ levels have been located near 20.3 and 25.6 MeV, respectively. The positions of five $2^{+}$ levels and an additional $4^{+}$ level are compared with previous work and with theoretical predictions based on the intermediate-coupling shell model.

Received 11 September 1972

DOI:https://doi.org/10.1103/PhysRevLett.29.1331

Authors & Affiliations

A. D. Bacher^*, F. G. Resmini^†, H. E. Conzett, R. de Swiniarski^‡, H. Meiner^§, and J. Ernst^∥

Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

^*Present address: Physics Department, Indiana University, Bloomington, Ind. 47401.
^†Present address: University of Milan, Milan, Italy.
^‡Present address: Institut des Sciences Nucléaires, Grenoble, France.
^§Present address: Schweizerische Bundesbahnen, Bern, Switzerland.
^∥Present address: Institut für Strahlen und Kernphysik der Universität Bonn, Bonn, Germany.