Orbital Recoupling Dominance in the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>A</mi><mo>=</mo><mn>20</mn><mn></mn></math></span> Isovector Giant <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>M</mi><mi></mi><mn>1</mn></math></span> Transition

C. J. Martoff; J. A. Bistirlich; K. M. Crowe; M. Koike; J. P. Miller; S. S. Rosenblum; W. A. Zajc; H. W. Baer; A. H. Wapstra; G. Strassner; P. Truöl

doi:10.1103/PhysRevLett.46.891

Orbital Recoupling Dominance in the $A = 20$ Isovector Giant $M 1$ Transition

C. J. Martoff, J. A. Bistirlich, K. M. Crowe, M. Koike, J. P. Miller, S. S. Rosenblum, W. A. Zajc, H. W. Baer, A. H. Wapstra, G. Strassner, and P. Truöl

Phys. Rev. Lett. 46, 891 – Published 6 April 1981

Abstract

The photon spectrum from ${}^{20}{Ne}$ ( $π^{-}$ , $γ$ ) ${}^{20}F$ has been measured. The branching ratio to ${}^{20}F$ ( $1^{+}$ , 1.06 MeV) is compared to the analogous $M 1$ decay width ${}^{20}{Ne}$ ( $1^{+}$ , 11.24 MeV) → ${}^{20}{Ne}$ (g.s.). This determines the relative importance of spin and orbital magnetization in the transition amplitude. The $M 1$ amplitude is found to contain only (47 ± 16)% spin flip, in agreement with shell-model calculations. Excitation of $2^{-}$ states by ${}^{20}{Ne}$ ( $π^{-}$ , $γ$ ) is also observed.

Received 8 December 1980

DOI:https://doi.org/10.1103/PhysRevLett.46.891

Authors & Affiliations

C. J. Martoff^*, J. A. Bistirlich, K. M. Crowe, M. Koike^†, J. P. Miller^‡, S. S. Rosenblum^§, and W. A. Zajc

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

H. W. Baer and A. H. Wapstra^§

Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545

G. Strassner^∥ and P. Truöl

Physik-Institut der Universität Zürich, CH-8001 Zürich, Switzerland

^*Present address: Physik-Institut der Universität Zürich, CH-8001 Zürich, Switzerland.
^†Permanent address: Institute of Nuclear Science, Tokyo, Japan.
^‡Present address: Physics Department, Boston University, Boston, Mass. 02215.
^§Permanent address: Instituut voor Kernphysisch Onderzoek, Amsterdam, The Netherlands.
^∥Present address: Laboratory for High-Energy Physics, Eidgenössische Technische Hochschule, c/o Schweizerisches Institut für Nuklearforschung, CH-5234 Villigen, Switzerland.