Adopted values for the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even–even nuclides are given in Table I. Values of τ, the mean life of the 2+ state; E, the energy; and β, the quadrupole deformation parameter, are also listed there. The ratio of β to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q0, is deduced from the B(E2)↑ value. The product E×B(E2)↑ is expressed as a percentage of the energy-weighted total and isoscalar E2 sum-rule strengths.

Table II presents the data on which Table I is based, namely the experimental results for B(E2)↑ values with quoted uncertainties. Information is also given on the quantity measured and the method used. The literature has been covered to November 2000.

The adopted B(E2)↑ values are compared in Table III with the values given by systematics and by various theoretical models. Predictions of unmeasured B(E2)↑ values are also given in Table III.

Transition probability from the ground to the first-excited 2^+ state of even-even nuclides

http://manuscript.elsevier.com/S0090375221000697/pdf/S0090375221000697.pdf

Nuclear Data Sheets for A=48

pdf/nuclear-structure-properties-of-even-even-chromium-isotopes-4z3x3op4it.pdf

Nuclear structure properties of even-even chromium isotopes and the effect of deformation on calculated electron capture cross sections

The main topic of the present work is the experimental determination of level lifetimes in 58,60,62Cr by means of the recoil distance Doppler-shift technique. The corresponding experiment was performed at the National Superconducting Cyclotron Laboratory at Michigan State University (USA). Excited states in 58,60,62Cr were populated by one-proton knockout reactions from fast radioactive 59,61,63Mn beams.
Level lifetimes were determined for the 2+ and 4+ states as well as - in case of 58,60Cr - for the 6+ states. The determined B(E2; 2+ -> 0+) values in 58,60,62Cr are in reasonable agreement with previous results from intermediate Coulomb-excitation experiments, although the present data suggests slightly enhanced collectivity. In 58Cr, the B(E2) values of the 4+ -> 2+ and 6+ -> 4+ transitions are comparable to the B(E2; 2+ -> 0+) value. From 58Cr to 60,62Cr, the B(E2; 4+ -> 2+) values evolve more rapidly compared to the B(E2; 2+ -> 0+) values which suggests rotor-like behaviour with pronounced quadrupole deformations ~0.3. 
Compared to the neighbouring iron isotones, the evolution of B(E2) values along the chromium isotopes toward N=40 indicates a comparable trend, although the collectivity in chromium appears to be mildly enhanced. 
The experimental results are discussed in the shell-model framework using the effective interaction LNPS. The comparison shows a pleasant agreement, although the experimental data suggests a slightly stronger enhancement of collectivity toward N=40.
Calculations with the interacting boson model were performed for 56,58,60,62Cr. They are able to reproduce the experimental excitation energies and transition strengths with reasonable accuracy but do not indicate a significant degree of quadrupole deformation. 
Other isotopes that were produced in the experiment were investigated with respect to the identification of g-ray transitions and level lifetimes. Of particular interest are the neutron-rich 59,61Mn isotopes (Z=25), for which level lifetimes of the 7/2-, 9/2- and 11/2- states were determined (in 61Mn the assignment is only tentative). In addition, level lifetimes in 63Mn of the tentatively assigned (7/2-) and (9/2-) states were evaluated. The results are compared to shell-model calculations using the fp interaction KB3G as well as the state-of-the-art interaction LNPS-m. The present data indicates a structural change close to N=36. The experimental data for 61Mn suggests that the B(M1) value for the 7/2^- -> 5/2- is underestimated by the LNPS-m interaction when free g factors are used. 
In the second part of this thesis, a tool is presented which allows to generate g-ray spectra of lifetime studies based on the electromagnetic Doppler-shift using empirical parameters. The tool is highly flexible which enables the incorporation of various experimental bounding conditions. It is applied to investigate the influence of velocity distributions on the lifetime analysis and results indicate that systematic deviations are minimized if distance-dependent mean recoil velocities are taken into account.

Lifetime Measurements in Neutron-rich Isotopes close to N=40 and Development of a Simulation Tool for RDDS Spectra

Nuclear Structure and Decay Data for A=44 Isobars

Enhanced collectivity along the N = Z line: Lifetime measurements in 44Ti, 48Cr, and 52Fe

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Enhanced collectivity along the N = Z line: Lifetime measurements in 44Ti, 48Cr, and 52Fe