Short lifetime determination via GRETINA and CHICO2

A deep inelastic experiment was performed at ATLAS with a 170-MeV $^{48}$Ca beam bombarding a 1 $mg/cm^2$ $^{70}$Zn target to investigate the shape-driving effects of the $\nu$g9/2 orbital in the region at N=40. The heavy ion counter CHICO2 was used to detect the target-like and projectile-like products simultaneously. The $\gamma$ rays, emitted in flight by both reaction products, were detected by GRETINA. The combination of GRETINA and CHICO2 allowed for a proper Doppler reconstruction. The thin target provides sensitivity for fast transitions. A new level was identified in $^{70}$Zn; its lifetime was determined by a new method. The same detector setup was used for a multi-step Coulomb excitation experiment with a 284-MeV $^{70}$Zn beam on a $^{208}$Pb target. The Coulomb-excitation analysis was performed using the coupled-channel least-square search code, GOSIA [1]. Most lifetimes of the excited states obtained in the present analysis agree well with the published data except for the $4_+^1$ state with a measured lifetime as 1.9(2) ps, which is much shorter than the reported value of 4.2(12) ps [2]. A detailed account of the technique and the results will be presented.[1] T. Czosnyka et al, Am. Phys. Soc 28(1983)745 [2]G. Gurdal et al., Nuclear Data Sheets, 136(2016)1-162.