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NUCLEAR MASSES AND THEIR IMPACT IN R-PROCESS NUCLEOSYNTHESIS

Mendoza-Temis, Joel de Jesus (2014):
NUCLEAR MASSES AND THEIR IMPACT IN R-PROCESS NUCLEOSYNTHESIS.
Darmstadt, DEU, TU Darmstadt, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/4100],
[Ph.D. Thesis]

Abstract

During the present Thesis, the role of the nuclear masses in r-process nucleosynthesis calculations have been explored. In order to accomplish this goal, we have computed neutron capture rates in the framework of the statistical model for all relevant nuclei in the r-process regime, to be more specific, nuclei ranging from Zn (Z=30) to Bi (Z=83) and contained inside the model dependent driplines. We have use the currently available mass models that best reproduce the known masses with a root mean square deviation smaller than RMSD<600 keV. This include the following set of mass models: Finite Range Droplet Model (FRDM), Weizsäcker-Skyrme model (WS3) and two variants of the Duflo-Zuker mass model, namely DZ10 and DZ31. The thermodynamical conditions were taken from hydrodynamical simulations corresponding to high entropy neutrino winds from core collapse supernovae (SNe) and Neutron star mergers(NSM).

Item Type: Ph.D. Thesis
Erschienen: 2014
Creators: Mendoza-Temis, Joel de Jesus
Title: NUCLEAR MASSES AND THEIR IMPACT IN R-PROCESS NUCLEOSYNTHESIS
Language: English
Abstract:

During the present Thesis, the role of the nuclear masses in r-process nucleosynthesis calculations have been explored. In order to accomplish this goal, we have computed neutron capture rates in the framework of the statistical model for all relevant nuclei in the r-process regime, to be more specific, nuclei ranging from Zn (Z=30) to Bi (Z=83) and contained inside the model dependent driplines. We have use the currently available mass models that best reproduce the known masses with a root mean square deviation smaller than RMSD<600 keV. This include the following set of mass models: Finite Range Droplet Model (FRDM), Weizsäcker-Skyrme model (WS3) and two variants of the Duflo-Zuker mass model, namely DZ10 and DZ31. The thermodynamical conditions were taken from hydrodynamical simulations corresponding to high entropy neutrino winds from core collapse supernovae (SNe) and Neutron star mergers(NSM).

Place of Publication: Darmstadt, DEU
Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 17 Aug 2014 19:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/4100
URN: urn:nbn:de:tuda-tuprints-41005
Referees: Martinez-Pinedo, Prof. Dr. Gabriel and Langanke, Prof. Dr. Karlheinz
Refereed / Verteidigung / mdl. Prüfung: 17 February 2014
Alternative Abstract:
Alternative abstract Language
Im Rahmen der vorliegenden Thesis wurde die Bedeutung der Kernmassen für Berechnungen der Nukleosynthese im Rahmen des r-Prozess untersucht. Zu diesem Zweck haben wir für alle relevanten Kerne entlang des r-Prozess-Pfads die Neutroneneinfangraten gemäss dem statistischen Modell berechnet. Dabei handelt es sich um Isotope von Zn (Z = 30) bis Bi (Z = 83) innerhalb der modellabhängigen Neutronen-Abbruchkante. Wir haben jene der gegenwärtig verfügbaren Kernmassenmodelle benutzt welche die experimentell bekannten Massen am besten reproduzieren, wobei die mittlere quadratische Abweichung geringer als 600 keV ist. Es handelt sich hierbei um das Finite-Range-Droplet-Modell (FRDM), das Weizsäcker-Skyrme-Modell (WS3) und zwei Varianten des Duflo-Zuker-Massenmodells, DZ10 und DZ31. Dynamische Netzwerkrechnungen entlang des r-Prozess-Pfads für thermodynamische Bedingungen wie sie in Neutrino-getriebenen Winden von Kernkollaps-Supernovae (SNe) oder bei der Verschmelzung zweier Neutronensterne (NSM) erwartet werden. Diese Bedingungen wurden in hydrodynamischen Simulationen dieser Szenarien bestimmt.German
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