Low Spin States in⁶⁴Zn and⁶⁶Zn

Abstract

The gamma decays following the 63Cu(p, 7)64Zn and "Cu@, ~) ~~Z n r eactions have been studied with Ge (Li) spectrometers. Proton energies of about 2 MeV have been used. Level schemes up t o about 4 MeV for 6 4 Zn and 66 Zn have been constructed from the data..

Onset of triaxial deformation in Zn66 and properties of its first excited 0+ state studied by means of Coulomb excitation

“…[15] and branching ratios from Refs. [28][29][30], see the text for the values. i Deduced from the average of the lifetimes measured in Refs.…”

Analysis of uncertainties inα-particle optical-potential assessment below the Coulomb barrier

“…They have been established or validated on the basis of independent measured data for neutron total cross sections and (p, n) reaction cross sections [23], γ-ray strength functions [24][25][26][27][28][29][30][31][32][33] and (p, γ) reaction cross sections [23], and low-lying levels [34] and resonance data [35], respectively. Only the points in addition to the details given formerly [7,18,19] as well as the particular parameter values are mentioned hereafter.…”

“…shift ∆ (for a spin cutoff factor calculated with a variable moment of inertia [38] between half and 75% of the rigid-body value, from g.s. to S, and reduced radius r0=1.25 fm), and the average radiation widths Γγ , either measured [35] or based on systematics (given between square brackets), and corresponding to the EGLO model parameter T f =0.7 MeV used for description of the RSF data of the Zn isotopes [24][25][26][27][28][29][30]33].…”

“…There have been used in this respect the formerly measured RSFs [24][25][26][27][28][29] and one high-accuracy measurement at lower energies [30] in the neighborhood of the compound nuclei around A∼60, and the recent systematic analyzes for Cd [31] and Sn [32] isotopes, around A∼110, while the similar data for heavier nuclei [33] were already considered previously [7].…”

“…[7] for A∼160, proves that both the SLO and GLO models overestimate the RSF data below the nucleon bind- 68 Zn nuclei, using to the SLO (dash-dot-dotted curves), GLO (dash-dotted curves), and EGLO (solid curves) models for E1 radiations, and SLO model for M1 radiations, as well as of the calculated average s-wave radiation widths Γγ (in meV). There are also shown the measured dipole γ-ray strength functions for 61,62,63,64,65 Cu, 64,66 Zn, 69 Ga and 76 Ge nuclei [24][25][26][27][28][29][30], and the Γγ values either measured or deduced from systematics of the measured data [35].…”