Microscopic quasiparticle-phonon model in the study of the beta decay of Cd-115
This master’s thesis concerns the use of the microscopic quasiparticle-phonon model
in the study of the beta minus decay of Cd-115. The first part of this text concentrates on
the theoretical description of nearly spherical open-shell odd-A nuclei by using the
microscopic quasiparticle-phonon model. The treatment of the subject is far from
exhaustive but all the necessary relations needed in the practical application of the
formalism are provided in the text.
The second part provides the theory that is needed for the study of beta minus decay. In addition to the general theory of forbidden beta minus decay, also the greatly simplified case of
allowed transitions are discussed. Again rather than providing a fully comprehensive
treatment of the subject, a more streamlined approach is adopted. All the various
relations that are needed in the practical application of the theory are provided in
the text.
Finally, in the third and final part of the text the above theoretical framework is
applied to the beta minus decay of Cd-115. In addition to the ground state transitions of
Cd-115, it is also possible to study the transitions coming from the first excitation
state due to its isomeric character. Because of the various possible ways of carrying
out the fitting of the QRPA phonons, several sets of calculated partial half-lives
are obtained. The calculated partial half-lives are compared to experimental results.
For several transitions values that are fairly close to the experimental ones can be
found. However, in many cases there are large disrepancies between the two. Some
of the transitions seem also to be very sensitive to the adjustments made to the
QRPA phonons. The effect of varying the nucleon spin-orbit interaction strength
was studied as an additional exercise.
...
Asiasanat
Metadata
Näytä kaikki kuvailutiedotKokoelmat
- Pro gradu -tutkielmat [29561]
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Comparison of Microscopic Interacting Boson Model and Quasiparticle Random Phase Approximation 0νββ Decay Nuclear Matrix Elements
Kotila, Jenni (Frontiers Media SA, 2021)The fundamental nature of the neutrino is presently a subject of great interest. A way to access the absolute mass scale and the fundamental nature of the neutrino is to utilize the atomic nuclei through their rare decays, ... -
A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors
Puurtinen, T. A.; Rostem, K.; de Visser, P. J.; Maasilta, I. J. (Springer, 2020)A nanoscale phononic crystal filter (reflector) is designed for a kinetic inductance detector where the reflection band is matched to the quasiparticle recombination phonons with the aim to increase quasiparticle lifetime ... -
Effective axial-vector coupling in beta decay of mass region A = 100 - 134 isotopes
Pirinen, Pekka (2014)Tutkielmassa tarkastellaan massa-alueen A = 100 - 134 ytimien käyttäytymistä beetahajoamisessa käyttäen QRPA-formalismia. Tavoitteena oli tutkia heikon vuorovaikutuksen efektiivisen aksiaalivektorikytkentävakion gA ... -
Rare beta decays and the spectrum-shape method
Haaranen, Mikko (University of Jyväskylä, 2017)This is a thesis consisting of seven publications and an introductory part on theoretical studies on rare single beta decays. Firstly, the theoretical framework is applied to the computation of partial half-lives for ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.