Status of Photon Evaporation Alessandro Brunengo INFN Genova Alessandro Brunengo Geant4 Workshop at Noordwijk, The Netherlands 20-24 September 1999.

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Presentation transcript:

Status of Photon Evaporation Alessandro Brunengo INFN Genova Alessandro Brunengo Geant4 Workshop at Noordwijk, The Netherlands September 1999

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Contributors Alessandro Brunengo - INFN Genova Carlo Dallapiccola - University of Maryland Maria Grazia Pia - INFN Genova

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Photon Evaporation It is one of possible de-excitation channels for excited nuclei. Two qualitative different kind of events: Ý Continuum γ energy distribution Evaporation channel in competition with the others (evaporation, fission, Fermi break-up, multifragmentation). Ý Discrete energy transitions Last step of evaporation cascade, at low excitation energy.

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Continuum γ energies It is part of the theory driven model. Ý E1 γ transitions only Ý Emitted γ energies sampled according to the distribution for Giant Dipole Resonance Ý Energy and width of GDR are independent from the nucleus excitation energy

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Discrete γ energies No other de-excitation channels at these energy levels ENSDF experimental data used for all de- excitation parameters: Ý nuclear level energy, angular momentum, half life Ý emitted γ energy, polarity, relative probability of emission from a given level

Photon Evaporation Design

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Photon energy, discrete levels Sn(120), 80 MeV Sn(112), 80 MeV MeV

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Photon creation time, discrete levels Sn(112): level at 2.51 MeV  (exp)  1.4· sec  (fit)  1.3· sec

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Gamma energy, continuum Sn(120) 80 MeV GDR Sn(112) 80 MeV MeV

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Photon creation time delay, continuum Sn(112) 80 MeVSn(120) 80 MeV

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Excitation energy at photon evaporation code activation Sn(112) 80 MeVSn(120) 80 MeV MeV

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 To be done Angular distribution of photons Ý The complete knowledge of initial and final states of angular momentum is needed (e.g. transitions to a final state with J=0) ENSDF data Ý management of (infrequent) inconsistencies in experimental data Ý update from ENSDF

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 Excitation energy at photon evaporation code activation Sn(112) 80 MeV Sn(120) 80 MeVSn(120) 100 MeV

Alessandro BrunengoGeant4 Workshop at Noordwijk, The Netherlands September 1999 From Geant4 Gallery