Speaker
Description
The decay of Tz=-1 fp shell nuclei
B. Rubio for the GSI_GANIL_RIKEN collaboration
IFIC (CSIC-Uni. Valencia), Spain
In this talk, I plan to present an overview of recent studies on the + decay of Tz=−1 nuclei in the fp-shell. The overview includes campaigns conducted at GSI, GANIL, and RIKEN. These experiments were carried out at fragmentation facilities using high-intensity primary beams, high-performance recoil separators, and advanced detector techniques. The experimental setup features charged particle detectors and gamma-ray Germanium (Ge) arrays. All the decays are very fast due to the involvement of super-allowed Fermi (F) transitions and allowed Gamow-Teller (GT) transitions. The experiments yielded rich spectroscopic data, enabling comparisons along the near-N=Z line. Several interesting phenomena can be studied, such as:
1. Mirror symmetry effects: These are explored by comparing + decays with the mirror charge-exchange reactions on stable Tz=+1 nuclei targets. (Y. Fujita, B. Rubio, W. Gelletly, Progr. Part. Nucl. Phys. 2011, 66, 549–606)
2. SU(4) symmetry interpretation: Possible insights into the decays based on SU(4) symmetry. (Van Isacker et al. Symmetry 2023, 15(11), 2001)
3. Theoretical calculations: Including these Fermi transitions in theoretical calculations for super-allowed ft-values and their implications for Vud matrix element and CKM matrix unitarity. (I. S. Towner and J. C. Hardy, Phys. Rev C 92, 055505 (2015))
Overview of the Tz=-1 beta decaying cases discussed in this work, references below
- 42Ti-54Ni (GSI)
Molina et al. Phys. Rev. C 91, 014301 (2015) - 56Zn (GANIl and RIKEN)
Kuckuc et al Eur. Phys. J. A 2017, 53, 134-1–10
DOI 10.1140/epja/i2017-12327-1
Nishimura et al. in preparation - 60Ge (RIKEN)
Orrigo et al. Phys. Rev. C 2021, 103, 014324-1–12. - 64Se (RIKEN)
Aguilera et al. in preparation - 70Kr (RIKEN)
Vitéz-Sveiczer et al. Phys. Lett. B 2022, 830, 137123-1–8.
