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Deforme 166Gd Çekirdeğinde Sözdespin Çiftlerinin Özellikleri

Properties of Pseudospin Partners in Deformed 166Gd Nucleus

Journal Name:

  • Cumhuriyet Üniversitesi Fen Fakültesi Fen Bilimleri Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Pseudospin symmetry was observed in spherical nuclei about fifty years ago. Origin of the symmetry has been not found until the last decade. In recent decade, it was understood that this symmetry appears when there are equal in magnitude attractive scalar and repulsive vector potentials (but they have opposite sign) in nuclei. This situation can provide possibility to investigate pseudospin symmetry within the relativistic mean field (RMF) theory which has been used to carry out many ground-state properties of nuclei successfully, because RMF theory includes the near equality in magnitude attractive scalar and repulsive vector potentials. Restoration of the single-particle energy levels within the framework of the pseudospin symmetry is different from usual restoration of single-particle energy levels. Because of this reason, an investigation of how change the single-particle spectra according to the deformation of nuclei can be interesting. In this study, the change of pseudospin partners according to quadrupole deformation parameter in the neutron and proton single-particle spectrum of the 166Gd nucleus which is known well deformed experimentally are investigated within the RMF theory. Also, the concepts of pseudospin symmetry and RMF theory are given in detail.
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Abstract (Original Language): 
Sözdespin simetrisi küresel çekirdeklerde elli yıl kadar önce gözlenmiştir. Uzun yıllar kaynağı anlaşılamayan bu simetrinin on yıl kadar önce çekirdek içerisinde eşit büyüklükte ancak zıt işaretli çekici skaler ve itici vektör potansiyeller varlığında ortaya çıktığı anlaşılmıştır. Bu durum yaklaşık bir biçimde bu tür potansiyelleri içeren ve çekirdeklerin birçok taban-durum özelliklerinin ortaya çıkarılmasında başarılı bir biçimde kullanılan relativistik ortalama alan (RMF) teorisinin sözdespin simetrisi incelemelerinde kullanılmasını mümkün kılmaktadır. Bu simetri çerçevesinde tek-parçacık enerji seviyelerinin kuantum sayılarına göre yerleşimlerinin gösterimi klasik gösterimden farklılık göstermektedir. Bu bağlamda sözdespin simetrisi çerçevesinde tek-parçacık enerji seviyelerinin çekirdek deformasyonuna bağlı olarak değişiminin incelenmesi ilginç olabilir. Bu nedenle bu çalışmada RMF teorisi çerçevesinde deforme olduğu deneysel olarak iyi bilinen 166Gd çekirdeğinin nötron ve proton tek-parçacık enerji seviyelerindeki sözdespin çiftlerinin kuadrupol deformasyon parametresine göre değişimi incelenmiştir. Ayrıca sözdespin kavramı ve RMF teorisi detaylıca irdelenmiştir.
FULL TEXT (PDF): 
PDF icon arastirmax-deforme-166gd-cekirdeginde-sozdespin-ciftlerinin-ozellikleri.pdf
  • 2
8-24
  • Turkish

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