Nuclei at extreme conditions. A relativistic study

Afanasjev, Anatoli¹ 

[1] Mississippi State Univ., Mississippi State, MS (United States)

关键词: proton-neutron pairing;    rotation;    pycnonuclear reactions;    crust of neutron stars;    time-odd mean fields;    hyperdeformation;    fission;    single-particle degrees of freedom;    the limits of nuclear existence;    theoretical uncertainties;   

DOI  :  10.2172/1236172
RP-ID  :  DOE-MSU--41459
PID  :  OSTI ID: 1236172

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The major goals of the current project were further development of covariant density functional theory (CDFT), better understanding of its features, its application to different nuclear structure and nuclear astrophysics phenomena and training of graduate and undergraduate students. The investigations have proceeded in a number of directions which are discussed in detail in the part ???Accomplishments??? of this report. We have studied the role of isovector and isoscalar proton-neutron pairings in rotating nuclei; based on available experimental data it was concluded that there are no evidences for the existence of isoscalar proton-neutron pairing. Generalized theoretical approach has been developed for pycnonuclear reaction rates in the crust of neutron stars and interior of white dwarfs. Using this approach, extensive database for considerable number of pycnonuclear reactions involving stable and neutron-rich light nuclei has been created; it can be used in future for the study of various nuclear burning phenomena in different environments. Time-odd mean fields and their manifestations in terminating states, non-rotating and rotating nuclei have been studied in the framework of covariant density functional theory. Contrary to non-relativistic density functional theories these fields, which are important for a proper description of nuclear systems with broken time-reversal symmetry, are uniquely defined in the CDFT framework. Hyperdeformed nuclear shapes (with semi-axis ratio 2.5:1 and larger) have been studied in the Z = 40-58 part of nuclear chart. We strongly believe that such shapes could be studied experimentally in the future with full scale GRETA detector.