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The regions of the nuclear chart displaying a rapid change of the collectivity with respect to the proton or neutron number, are of a particular interest for testing nuclear models [1]. Such kind of behaviour has been noticed along the iron isotopic chain as moving from the stable towards the N=50 shell closure. Theoretical calculations performed with the LNPS interaction which was developed to study the Fe isotopes predicts an island of inversion around the N=40 with strong quadrupole correlations in Fe for N≥30 [2]. Similar conclusions were drawn also by the shell model employing pairing and multipole interaction [3]. Therefore Fe isotopes with N≥28 are a good testing ground for rapid shape evolution from a spherical to a well deformed region close to N=40.
Two proton transfer reactions employing 14C and 18O beams have been used in the past for performing spectroscopy of several elements such as: 34Si, 44Ti, 62Fe, 68Ni [4-6].
We aim to use a 18O beam with 63 MeV on a target of 64Ni to populate excited states in 62Fe and perform lifetime measurements via RDDS/DSAM techniques employing the AGATA array coupled to the Sauron silicon detector. Based on Fresco calculations the cross section for the 0$^+_2$ and $2^+_2$ states in 62Fe are peaked at the forward angles [7]. Lifetime measurements of the 0$^+_2$ and 2$^+_2$ states could be used to benchmark the structure of 62Fe nucleus and could help to predict features at more neutron rich isotopes, towards the N=40 island of inversion.
[1] M. Klintefjord et al., Phys. Rev. C 95, 024312 (2017)
[2] S. M. Lenzi, F. Nowacki, A. Poves, and K. Sieja, Phys. Rev. C 82, 054301 (2010)
[3] K. Kaneko, T. Otsuka, B. A. Brown, and T. Mizusaki, Phys. Rev. C 78, 064312
[4] M. Bernas et al., Physical Review C, 24 (1981) 2
[5] R. H. Siemssen et at., Physical Review Letters, 28 (1972) 10
[6] Z. Phys. A - Atoms and Nuclei 319, 287-293 (1984)
[7] N. Keeley - Private communication
