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

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

Energy levels of A = 21−44 nuclei (V)

Algebras, BPS states, and strings

Magnetism has been a topic of study since the ancient times of science. Judging by the number of papers appearing each year, the group of scientists concerned with the properties of magnetic materials is vastly expanding. The reason for the great interest in this field is not only the wide application which these materials have found in technology, but also the chance to contribute to the understanding of basic physics. The term “magnetic material” in this article refers to a substance which spontaneously exhibits magnetic order below a certain temperature. This magnetic order can be of the ferro-, ferri-, antiferro-, or metamagnetic kind. However, within these magnetic structures ferromagnetism appears to be the most important one. Ferromagnetism is defined by the spontaneous parallel alignment of atomic magnetic moments over relatively large regions of a solid. Magnetic order is limited to compounds which contain elements with incompletely filled electron shells, as for example, the transition ...

The optical electrical and magnetic properties of the europium chalcogenides and the rare earth pnictides

COULOMB EXCITATION OF $sup 28$Si PROJECTILES.

Reorientation measurements in even titanium isotopes

MEASUREMENT OF THE STATIC QUADRUPOLE MOMENT OF THE FIRST EXCITED STATE IN $sup 24$Mg.

Coulomb excitation of the first excited state of 28Si

The Coulomb excitation of a thick 24Mg target was studied with 35Cl ions of 61, 57, and 52 MeV. The absolute cross section and the anisotropy of the angular distribution of the ground state transition from the 1.369-MeV state in 24Mg was measured, and their dependence on B(E2) and the quadrupole moment, Q, of the 1.369-MeV state was calculated. A B(E2) of 24.5 ± 2.2 Weisskopf units (W.u.) was deduced from the line shape of the 1.369-MeV gamma ray observed with a 40 cm3 Ge(Li) detector. The quadrupole moment determined from the anisotropy measurement was Q = −0.38 ± 0.16 b. From the cross-section measurement, Q = −0.47 ± 0.19 b was obtained using B(E2) = 24.5 ± 2.2 W.u. The dependence of this value of Q on B(E2) is discussed.

H. C. Evans

Papers

COULOMB EXCITATION OF $sup 28$Si PROJECTILES.

Reorientation measurements in even titanium isotopes

MEASUREMENT OF THE STATIC QUADRUPOLE MOMENT OF THE FIRST EXCITED STATE IN $sup 24$Mg.

Coulomb excitation of the first excited state of 28Si

Coulomb excitation of 24Mg with 35Cl ions