β-decay studies around 78Ni: Investigation of neutron-rich Fe and Ni isotopes
by
Giovanna Benzoni(INFN, sezione di Milano)
→
Europe/Zurich
CERN
CERN
Description
One of the main unanswered questions of modern nuclear physics is whether the traditional magic numbers of protons and neutrons, such as they are known near stability, are maintained for extremely neutron-rich nuclei, or whether new magic numbers emerge as a result of the unbalanced neutron-to-proton ratio. The nuclear region around 78Ni, close to the classic shell closures with Z=28 and N=50, has attracted great attention in recent years, since this region has become experimentally accessible. In this talk recent experimental results on n-rich Fe and Ni isotopes, approaching 78Ni, populated follow- ing beta decay, will be presented. The experiment was recently performed at Riken (J) using the EURICA setup [1]. The region between Cu and Mn isotopes has been effi- ciently populated by the relativistic fission reaction induced by the high-intensity 238U beam. Ions forming the cocktail beam have been transported and identified in the Bi- gRIPS+ZeroDegree spectrometer [2] and brought to rest in the DSSSD of the WAS3ABI array [3]. The EURICA array has been complemented with LaBr3 detectors for fast tim- ing measurements in the decay products [4]. In this talk the measurement of low-spin structure in 70−74Ni will be discussed, together with results on 68−70Fe.
Prospects for experiments at future facilities will also be discussed.
* This work is supported by Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) number 2001024324 01302.
by the Science Research Council.
References
[1] P.-A. S ̈oderstr ̈om et al., Nucl. Instr. and Meth. B317 (2013) 649.
[2] T. Kubo: Nucl. Instr. Methods Phys. Res. B204 (2003) 97; Y. Mizoi et al., RIKEN Accel. Prog. Rep. 38 (2008) 297.
[3] S. Nishimura: Prog. Theor. Exp. Phys. 2012 (2012) 03C006.
[4] Z. Patel, et al.: RIKEN Acc. Prog. Rep. 47 (2014).
