Tz=-1→0 β decays of Ni 54, Fe 50, Cr 46, and Ti 42 and comparison with mirror (He 3,t) measurements

F. Molina, B. Rubio, Y. Fujita, W. Gelletly, J. Agramunt, A. Algora, J. Benlliure, P. Boutachkov, L. Cáceres, R. B. Cakirli, E. Casarejos, C. Domingo-Pardo, P. Doornenbal, A. Gadea, E. Ganioʇlu, M. Gascón, H. Geissel, J. Gerl, M. Górska, J. GrboszR. Hoischen, R. Kumar, N. Kurz, I. Kojouharov, L. Amon Susam, H. Matsubara, A. I. Morales, Y. Oktem, D. Pauwels, D. Pérez-Loureiro, S. Pietri, Zs Podolyák, W. Prokopowicz, D. Rudolph, H. Schaffner, S. J. Steer, J. L. Tain, A. Tamii, S. Tashenov, J. J. Valiente-Dobón, S. Verma, H. J. Wollersheim

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Abstract

We have studied the β decay of the Tz=-1,f7/2 shell nuclei Ni54,Fe50,Cr46, and Ti42 produced in fragmentation reactions. The proton separation energies in the daughter Tz=0 nuclei are relatively large (≈4-5 MeV) so studies of the γ rays are essential. The experiments were performed at GSI as part of the Stopped-beam campaign with the RISING setup consisting of 15 Euroball Cluster Ge detectors. From the newly obtained high precision β-decay half-lives, excitation energies, and β branching ratios, we were able to extract Fermi and Gamow-Teller transition strengths in these β decays. With these improved results it was possible to compare in detail the Gamow-Teller (GT) transition strengths observed in beta decay including a sensitivity limit with the strengths of the Tz=+1 to Tz=0 transitions derived from high resolution (3He,t) reactions on the mirror target nuclei at RCNP, Osaka. The accumulated B(GT) strength obtained from both experiments looks very similar although the charge exchange reaction provides information on a broader energy range. Using the "merged analysis" one can obtain a full picture of the B(GT) over the full Qβ range. Looking at the individual transitions some differences are observed, especially for the weak transitions. Their possible origins are discussed.

Original languageEnglish
Article number014301
JournalPhysical Review C - Nuclear Physics
Volume91
Issue number1
DOIs
Publication statusPublished - jan. 5 2015

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Molina, F., Rubio, B., Fujita, Y., Gelletly, W., Agramunt, J., Algora, A., Benlliure, J., Boutachkov, P., Cáceres, L., Cakirli, R. B., Casarejos, E., Domingo-Pardo, C., Doornenbal, P., Gadea, A., Ganioʇlu, E., Gascón, M., Geissel, H., Gerl, J., Górska, M., ... Wollersheim, H. J. (2015). Tz=-1→0 β decays of Ni 54, Fe 50, Cr 46, and Ti 42 and comparison with mirror (He 3,t) measurements. Physical Review C - Nuclear Physics, 91(1), [014301]. https://doi.org/10.1103/PhysRevC.91.014301