Interplay between Single-Particle and Collective Effects in the Odd-ACu Isotopes beyondN=40

Abstract

Collective properties of the low-lying levels in the odd-A 67-73Cu were investigated by Coulomb excitation with radioactive beams. The beams were produced at ISOLDE and postaccelerated by REX-ISOLDE up to 2.99 MeV/u. In 67,69Cu, low-lying 1/2(-), 5/2(-), and 7/2(-) states were populated. In 71,73Cu, besides the known transitions deexciting the single-particle-like 5/2(-) and core-coupled 7/2(-) levels, gamma rays of 454 and 135 keV, respectively, were observed for the first time. Based on a reanalysis of beta-decay work and comparison with the systematics, a spin 1/2(-) is suggested for these excited states. Three B(E2) values were determined in each of the four isotopes. The results indicate a significant change in the structure of the odd-A Cu isotopes beyond N=40 where single-particle-like and collective levels are suggested to coexist at very low excitation energies.

Coulomb excitation ofGa73

“…The analysis of the Coulomb excitation data on 69,71,73 Cu was published previously in [22]. This work shows the population of 1/2 − , 5/2 − , and 7/2 − levels.…”

Shell Evolution towards Ni78 : Low-Lying States in Cu77Şahin1, Garrote2, Tsunoda3 et al. 2017Phys. Rev. Lett.Self Cite347220View full textAdd to dashboardCite

“…Earlier β-decay, Coulomb excitation, and multinucleon transfer reaction studies showed rather complicated level sequences in the neutron-rich 69-73 Cu isotopes, caused by different excitation modes [13][14][15][16][17][18]. The low-lying 5=2 − and 7=2…”

Nuclear-structure studies of exotic nuclei with MINIBALL

“…The data revealed the presence of both single-particle and collective states at low energy in the neutronrich Cu nuclei that drop with increasing value of N and lie at approximately the same energy. This behavior illustrates the sensitivity of the transition rates to the details of the wave functions [18]. 70 Zn.…”

“…Simultaneously experiments along the chains of neutron-rich Ni, Cu and Zn isotopes were pursued in order to study collective and single particle properties in the vicinity of N=40 and the doubly-magic configuration at 78 Ni [16][17][18][19][20][21][22][23][24][25][26][27][28]. Moreover, the first g-factor measurement of excited states was successfully performed with a radioactive ion beam at ISOLDE in this region [24].…”