Электронный каталог

Книга (аналит. описание)

Izosimov, I.
Some Features of Beta Decay of Exotic Nuclei and K- Isomers / I.Izosimov // The 2nd International African Symposium on Exotic Nuclei IASEN2024, Cape Town, 09 - 13 December 2024 : Book of Abstracts [Electronic resource]. – Cape Town, 2024. – P. 3. – URL: http://inis.jinr.ru/sl/NTBLIB/IASEN-2024-P3.pdf. – Bibliogr.: 13.

The probability of the *b-transition to the nuclear level with excitation energy Е is proportional [1] to the product of the lepton part described by the Fermi function f(Q*b – E) and the nucleon part described by the *b-decay strength function S*b(E). At excitation energies E smaller than Q*b (total *b-decay energy), S*b(E) determines the characters of the *b-decay. For higher excitation energies that cannot be reached with the *b-decay, S*b(E) determines the charge exchange nuclear reaction cross sections, which depend on the nuclear matrix elements of the *b-decay type [1-3].It was shown [2-5] that the high-resolution nuclear spectroscopy methods give conclusive evidence of the resonance structure of S*b(E) both for GT and first-forbidden (FF) *b-transitions in spherical, deformed, and transition nuclei. The splitting of the peaks in the S*b(E) for the GT *b+/EC-decay of the deformed nuclei into two components was demonstrated [3-6]. Resonance structure of the S*b(E) for *b-decay of halo nuclei was analyzed in [7-9]. Fission and alpha-decay of the high-spin isomers are rather strongly forbidden, while the beta-decay of the high-spin isomers can populate high-spin levels near the yrast-band [10]. Than after a few gamma-decays the yrast-band levels may be populated. The prediction of the energies of the levels of the corresponding yrast-band can be done by using the model proposed in [11]. Such prediction is extremely useful in planning and carry out experiments, especially in the region of heavy and superheavy nuclei [12,13]. In this report the fine structure of S*b(E) is analysed. Resonance structure of S*b(E) for GT and FF *b-decays, structure of S*b(E) for halo nuclei, quenching [9] of the weak axial-vector constant gAeff, splitting of the peaks in S*b(E) for deformed nuclei connected with the anisotropy of oscillations of proton holes against neutrons (peaks in S*b(E) of GT *b+/EC-decay) or of protons against neutron holes (peaks in S*b(E) of GT b– – decay), and S*b(E) for the high-spin isomers [10] *b-decays in heavy and superheavy nuclei are discussed.



Спец.(статьи,препринты) = С 341.1б - Бета-распад и К-захват. Схемы распада и спектры
ОИЯИ = ОИЯИ (JINR)2024