A Study of Energy Levels in Odd-Mass Copper Nuclei by Means of the (α,p) Reaction

Abstract

A linear initial-value code is used to study the combined effect of resistivity and viscosity on the stability of a static z-pinch. Resistivity alone is seen to have only a minor effect, even at Lundquist parameters for which neglecting the evolution of the equilibrium is unjustified. However, the introduction of a scalar viscosity leads to strong damping of m = 0 and m = 1 modes, and can completely stabilize short-wavelength perturbations. In agreement with SPIES (1988, Plasma Phys. Contr. Fusion 30, 1025), the stability threshold is found to be given in terms of the product of the Lundquist parameter and the viscous Reynolds number, so that the mode stability is due to the combined effect of resistivity and viscosity. When the scalar viscosity is replaced by the full ion stress tensor, the damping is seen to become less effective as the viscosity becomes more anisotropic. However, linear growth-rates are still significantly reduced for typical z-pinch parameters.

Core-coupled protons,f7/2intruder states, and competingg9/2proton and neutron structures inChiara1, Stefanescu2, Walters3 et al. 2012Phys. Rev. C

“…In the present study, a 661-keV gamma ray was observed between the 3660-keV, 13/2 + state and one at 2998 keV; the latter may correspond to the one seen in Ref. [28]. The AD for this gamma ray is consistent with a ∆I = 1 dipole character [ Fig.…”

“…12 of the (α, p) study by Nybø et al [28] there is an unlabelled peak Asai et al assigned firm spins and parities to all of the 67 Cu levels identified in Ref.…”

“…[17] lists three unique levels between 2525 and 2535 keV. Two of these, at 2525.74(21) and 2533.9(4) keV, were associated with L = 4 transfer from 0 + target ground states [(α, p) [28], (t, α) [29], ( 3 He,d) [30], and (α, t) [31] reactions], L = 3 from [33], (t, p) [34], and (d, d ′ ) [35] reactions], or both. In addition, for the former of these two levels, a 1044-keV gamma ray observed in (p, p ′ γ) was Gamma-ray intensities are represented by the widths of the arrows.…”

“…Most of the transfer reactions did not have sufficient energy resolution to reliably infer the presence of two 9/2 + states within ∼8 keV of each other (the exception being Ref. [28] which identified only a single state with a 2-keV uncertainty); this conclusion was instead based on the highresolution gamma-ray energy measurements. In the present work, the existence of this 9/2 + doublet was investigated.…”

“…3 A level at 3003(5) keV was identified in the (α, p) transfer study by Nybø et al [28] and assigned I π = (11/2 − ) based on a DWBA analysis. In the present study, a 661-keV gamma ray was observed between the 3660-keV, 13/2 + state and one at 2998 keV; the latter may correspond to the one seen in Ref.…”