Abstract
The role of particle evaporation in the properties of the Giant Dipole Resonance built on excited states is investigated. Two phenomena are discussed. The first one is based on the idea that the finite lifetime of the compound nucleus gives a finite width for any of the compound nucleus levels. This leads to the prediction of a fast increase of the width of the observed GDR transitions which is compatible with the data and may partly explain the observed saturation of the photon yield. The second new physical effect is based on the fact that each individual particle emission induces a strong fluctuation of the dipole moment of the nucleus. When the time between two particle emissions becomes comparable to the period of the harmonic oscillation, the transition between the order and the chaos is reached and the collective vibration is suppressed. From this simple argument a quenching factor can be deduced and compared with existing suppression factors. (K.A.) 19 refs., 7 figs.
Citation Formats
Chomaz, Ph.
Width and strength of the hot Giant Dipole Resonance. The role of the life time of the compound nucleus and the transition from order to chaos.
France: N. p.,
1993.
Web.
Chomaz, Ph.
Width and strength of the hot Giant Dipole Resonance. The role of the life time of the compound nucleus and the transition from order to chaos.
France.
Chomaz, Ph.
1993.
"Width and strength of the hot Giant Dipole Resonance. The role of the life time of the compound nucleus and the transition from order to chaos."
France.
@misc{etde_10146443,
title = {Width and strength of the hot Giant Dipole Resonance. The role of the life time of the compound nucleus and the transition from order to chaos}
author = {Chomaz, Ph}
abstractNote = {The role of particle evaporation in the properties of the Giant Dipole Resonance built on excited states is investigated. Two phenomena are discussed. The first one is based on the idea that the finite lifetime of the compound nucleus gives a finite width for any of the compound nucleus levels. This leads to the prediction of a fast increase of the width of the observed GDR transitions which is compatible with the data and may partly explain the observed saturation of the photon yield. The second new physical effect is based on the fact that each individual particle emission induces a strong fluctuation of the dipole moment of the nucleus. When the time between two particle emissions becomes comparable to the period of the harmonic oscillation, the transition between the order and the chaos is reached and the collective vibration is suppressed. From this simple argument a quenching factor can be deduced and compared with existing suppression factors. (K.A.) 19 refs., 7 figs.}
place = {France}
year = {1993}
month = {Dec}
}
title = {Width and strength of the hot Giant Dipole Resonance. The role of the life time of the compound nucleus and the transition from order to chaos}
author = {Chomaz, Ph}
abstractNote = {The role of particle evaporation in the properties of the Giant Dipole Resonance built on excited states is investigated. Two phenomena are discussed. The first one is based on the idea that the finite lifetime of the compound nucleus gives a finite width for any of the compound nucleus levels. This leads to the prediction of a fast increase of the width of the observed GDR transitions which is compatible with the data and may partly explain the observed saturation of the photon yield. The second new physical effect is based on the fact that each individual particle emission induces a strong fluctuation of the dipole moment of the nucleus. When the time between two particle emissions becomes comparable to the period of the harmonic oscillation, the transition between the order and the chaos is reached and the collective vibration is suppressed. From this simple argument a quenching factor can be deduced and compared with existing suppression factors. (K.A.) 19 refs., 7 figs.}
place = {France}
year = {1993}
month = {Dec}
}