Giant monopole resonance strength in $^{40} Ca$

Publisher Website

1 June 1997

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 55 (6) , 2811-2818
https://doi.org/10.1103/physrevc.55.2811

Abstract

The giant resonance region in

^{40} Ca

was studied with inelastic scattering of 240 MeV α particles at small angles including 0°. A peak at

E_{x} = 17.5 \pm 0.4 MeV

with

Γ = 4.95 \pm 0.25 MeV

was found to contain

33 \pm 4 %

of the isoscalar

E 0

energy-weighted-sum-rule (EWSR) strength and

57 \pm 6 %

of the isoscalar

E 2

EWSR. Evidence was found for

92 \pm 15 %

of the isoscalar

E 0

EWSR between

8 < E_{x} < 29 MeV

with a centroid of

18.9 \pm 0.4 MeV

and a rms half width of 11.1 MeV but a definitive

L = 0

assignment could not be made. The resulting

E_{GMR}

is in agreement with systematics from heavier nuclei.

Keywords

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