Isobar excitations and low energy spectra of light nuclei
Description
The aim of this investigation is to study the possible influence of inner excitations of nucleons into the Δ(3,3)-resonance on the low lying spectra of light nuclei like 12C and 16O. Before we can study the effect of such exotic configurations one has to perform a reliable investigation within the normal nuclear model, which is based on a microscopic theory. This is achieved by performing RPA (Random Phase Approximation) calculations using a realistic residual interaction derived from the Brueckner G-matrix. An efficient parametrisation of the residual interaction is introduced and the reliability of the more phenomenological parametrisations which are generally used is discussed. Within such realistic calculations, the isobar effects are small. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Das Ziel dieser Rechnungen ist das Studium moeglicher Einfluesse innerer Anregungen von Nukleonen, insbesondere der Δ(3,3)-Resonanz auf tiefliegende Zustaende leichter Kerne wie 12C und 16O. Bevor wir die Effekte bei solch exotischen Konfigurationen studieren koennen, muessen wir zuverlaessige Rechnungen fuer uebliche, auf einer mikroskopischen Theorie beruhende, Kernmodelle durchfuehren. Dies kann durch eine RPA (Random Phase Approximation) Rechnung erreicht werden, die mit einer realistischen Restwechselwirkung durchgefuehrt wird. Diese Restwechselwirkung wird aus der Bruecknerschen G-Matrix berechnet. Fuer die Restwechselwirkung wird eine Parametrisierung eingefuehrt, die es erlaubt die Wechselwirkung, in effizienter Weise zu berechnen. Die Zuverlaessigkeit der sonst ueblichen phaenomenologischen Parametrisierungen wird diskutiert. Bei einer realistischen Rechnung sind die Effekte der Isobar-Anregungen klein. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 116 p.
- Report number
- INIS-mf--9848
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 17008342
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Numerical Data, Thesis
- Descriptors DEI
- BRUECKNER MODEL; CARBON 12; DELTA-1236 RESONANCES; ELECTROMAGNETIC FIELDS; ELECTROMAGNETIC FORM FACTORS; EXCITED STATES; G MATRIX; HARMONIC POTENTIAL; ISOSPIN; MATRIX ELEMENTS; MULTIPOLE TRANSITIONS; M1-TRANSITIONS; M2-TRANSITIONS; M4-TRANSITIONS; NUCLEAR MATTER; NUCLEAR STRUCTURE; OPE POTENTIAL; OXYGEN 16; PARTICLE-HOLE MODEL; RANDOM PHASE APPROXIMATION; ROTATIONAL STATES; SPIN FLIP; STRENGTH FUNCTIONS; THEORETICAL DATA; WAVE FUNCTIONS; WOODS-SAXON POTENTIAL
- Descriptors DEC
- BARYON RESONANCES; BARYONS; CARBON ISOTOPES; DATA; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; EVEN-EVEN NUCLEI; FERMIONS; FORM FACTORS; FUNCTIONS; HADRONS; INFORMATION; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MATRICES; MATTER; N*RESONANCES; NUCLEAR MODELS; NUCLEAR POTENTIAL; NUCLEI; NUMERICAL DATA; OXYGEN ISOTOPES; PARTICLE PROPERTIES; POTENTIALS; RESONANCE PARTICLES; STABLE ISOTOPES