Sökning: "gammastrålning"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet gammastrålning.

  1. 1. Element 115

    Författare :Ulrika Forsberg; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; superheavy elements; element 115; new elements; alpha decay; X rays; gamma rays; nuclear structure; spontaneous fission; Fysicumarkivet A:2016:Forsberg; kärnstruktur; supertunga grundämnen; nya grundämnen; alfasönderfall; röntgenstrålning; gammastrålning; spontan fission; element 115; spektroskopi;

    Sammanfattning : This thesis is devoted to detailed studies of element 115 decay chains using the highly efficient multi-coincidence alpha, electron, gamma and X-ray detector setup TASISpec at the gas-filled separator TASCA at GSI, Darmstadt, Germany. In a three-week long experiment thirty new decay chains assumed to stem from element 115 isotopes were observed together with the very first detections of gamma rays and potential X-rays from these nuclei. LÄS MER

  3. 2. Nuclear Structure Studies near 208Pb and γ-ray Imaging Techniques

    Författare :Natasa Lalovic; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nuclear structure; gamma-Ray spectroscopy; AGATA; isomeric decays; relativistic projectile fragmentation; Pb isotopes; nuclear structure; gamma-ray spectroscopy; AGATA; isomeric decays; relativistic projectile fragmentation; Pb isotopes;

    Sammanfattning : This thesis focuses on a high-resolution γ-ray spectroscopy experiment where the fragmenta- tion of a 208 Pb primary beam was used to populate even-mass nuclei around 208 Pb. It was conducted in 2012 using the Advanced GAmma-ray Tracking Array (AGATA) while it was placed at GSI Darmstadt, Germany. LÄS MER

  4. 3. Orphan source detection in mobile gamma-ray spectrometry - Improved techniques for background assessment

    Författare :Peder Kock; Malmö Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Gamma spectrometry; airborne; car-borne; radioactive; orphan sources; hypothesis testing; background radiation;

    Sammanfattning : Hazardous radioactive sources out of regulatory control are referred to as orphan sources. Focussing on gamma-emitting orphan sources, this thesis describes methods that can be used in mobile gamma-ray spectrometry to perform real-time discrimination between an actual source signal and the signal due to the natural radiation background. LÄS MER

  5. 4. Lifetime Measurements of Excited States in the Semi-Magic Nucleus 94Ru

    Författare :Aysegul Ertoprak; Bo Cederwall; Magdalena Zielinska; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nuclear structure; lifetime measurements; doppler shift attenuation method; thick target; Fysik; Physics;

    Sammanfattning : Lifetimes of highly excited states in the semi-magic (N=50) nucleus 94Ru were deduced from an analysis of the Doppler broadened transition line shapes. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru∗ fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex situated in Caen, France. LÄS MER

  7. 5. Studies of dark matter in and around stars

    Författare :Sofia Sivertsson; Tommy Ohlsson; Joakim Edsjö; Gianfranco Bertone; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dark matter; particle astrophysics;

    Sammanfattning : There is by now compelling evidence that most of the matter in the Universe is in the form of dark matter, a form of matter quite different from the matter we experience in every day life. The gravitational effects of this dark matter have been observed in many different ways but its true nature is still unknown. LÄS MER