Sökning: "NATURAL SCIENCES Physics Nuclear physics"

Visar resultat 16 - 20 av 439 avhandlingar innehållade orden NATURAL SCIENCES Physics Nuclear physics.

1. 16. Mesonic fusion - pion and eta meson production in light ion nuclear fusion reactions

   Författare :Irina Zartova; Per-Erik Tegnér; Thomas Nilsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; pionic fusion; halo nuclei; cross sections; light mesons; eta-meson; WASA detector; Nuclear physics; Kärnfysik; Nuclear Physics; kärnfysik;

   Sammanfattning : The present thesis describes two experiments performed in the storage ring CELSIUS at The Svedberg Laboratory in Uppsala. In the first experiment the importance of three - nucleon clustering in the six - nucelon system was investigated. The total cross section for the production of the ground state and the 3. LÄS MER

3. 17. Influence of Nuclear Structure on Decay Properties of Heavy Nuclei

   Författare :Daniel Ward; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; alpha decay; hindrance factors; Skyrme-Hartree-Fock-Bogoliubov model; superheavy nuclei; fission yields; Brownian-shape motion; nuclear structure; nuclear level density; alpha decay; hindrance factors; Skyrme-Hartree-Fock-Bogoliubov model; superheavy nuclei; fission yields; Brownian-shape motion; nuclear structure; nuclear level density; Fysicumarkivet A:2017:Ward;

   Sammanfattning : This dissertation deals with the effects of nuclear structure on the α-decay properties, and on the fission-yielddistributions from the decay of heavy nuclei. The nuclear-structure and decay properties of superheavynuclei is one of the central topics for investigation. LÄS MER

4. 18. Lifetime measurements of excited states in 165Lu and 107Cd

   Författare :Karin Andgren; Bo Cederwall; Nicolae Sandulescu; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear Physics; Experimental Nuclear Strucuture; Nuclear physics; Kärnfysik;

   Sammanfattning : Measuring lifetimes of excited nuclear states can give important information on the internal structure of the nucleus. This thesis is based on two experiments performed in Italy and in the USA in order to deduce the lifetimes of excited states in 165Lu and 107Cd. LÄS MER

5. 19. η Meson Production in Proton-Proton Collisions at Excess Energies of 40 and 72 MeV

   Författare :Henrik Petrén; Tord Johansson; Pawel Moskal; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; Kärnfysik; Elementary particle physics; Elementarpartikelfysik; Nuclear Physics; kärnfysik;

   Sammanfattning : The production of η mesons in proton-proton collisions has been studied with the WASA detector using internal pellet targets in the CELSIUS storage ring at the The Svedberg Laboratory in Uppsala. Data were taken at two beam energies, 1360 MeV and 1445 MeV, corresponding to CM excess energies of 40 and 72 MeV, respectively. LÄS MER

7. 20. Radiation Detection Techniques for the Enhancement of Nuclear Safety

   Författare :Petty Bernitt Cartemo; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; whole body counting; depth profiling; voxel phantom; nuclear safeguards; Monte Carlo; orphan sources; radiation-induced material damage; pulsed beam; positron lifetime;

   Sammanfattning : The hazard originating from the use of nuclear materials in various areas of the society necessitates a number of experimental techniques for controlling and increasing the safety connected to radioactive substances.The following thesis is divided into two parts, representing different aspects to the detection of radiation effects. LÄS MER