Energy levels of A = 21−44 nuclei (V)

▪ Abstract The experimental extraction of detailed barrier distributions has brought a significant advance in the study of the fusion of heavy nuclei, and indeed in the entire heavy-ion reaction process. A quantitative understanding of the entrance-channel effects induced by target and projectile structure has emerged, based on recent high-precision measurements of fusion excitation functions. These distributions show clearly whether the experimental data are good enough to give the information required. They are also the functions best suited to the theoretical interpretation of the reaction dynamics—often presenting an unambiguous “fingerprint” of the target and projectile structure. We are now at the stage where we can start to exploit the insights gained in order to understand properties of the compound nucleus created: its spin distribution and evaporation residues, perhaps its possible shapes, and, in the case of heavy systems, its subsequent fission.

Measuring barriers to fusion

Nuclear Data Sheets for A = 152

High-spin spectroscopy of the 142Eu, 143Eu and 144Eu nuclei

Nuclear Data Sheets for A = 58☆

Excitation energies, spins, and parities have been determined for /sup 152/Dy in (HI,xn) reactions up to I/sup ..pi../ = 27/sup +/. Three isomers with T/sub 1/2/ = 49.5 ns (E/sub x/ = 5035 keV, I/sub ..pi../ = 16/sup +/), 9.9 ns (E/sub x/ = 6076 keV, I/sup ..pi../ = 20/sup -/), and 1.6 ns (E/sub x/ = 7828 keV, I/sup ..pi../ = 26/sup -/) have been found. The g factor of the second isomeric state was measured to be g = 0.55 +- 0.06. The present experimental data compares well with microscopic calculations which imply an oblate shape for /sup 152/Dy at high angular momenta (I/sup ..pi../ > or = 16/sup +/).

Yrast isomers and possible oblate shape in /sup 152/Dy

Yrast states of $^{160}\mathrm{Yb}$ with spins up to $30\ensuremath{\hbar}$ were identified in the reaction $^{148}\mathrm{Sm}$($^{16}\mathrm{O}$,$4n\ensuremath{\gamma}$). In addition to an initial backbend at $I=12\ensuremath{\hbar}$, a second backbend occurs at $I=28\ensuremath{\hbar}$. This result is discussed in terms of recently proposed explanations of the backbending effect.

Second Irregularity in the Yrast Line of Yb-160

Magnetic moments of the Iπ = 10+ isomers in Ce and Nd N = 80 isotones

In addition to the known (f/sub 7/2/)/sup n/ multiplets, states with spins ranging up to 10/sup +/ (11/sup +/) have been identified in /sup 5/0Ti, /sup 5/2Cr, and /sup 5/4Fe via (..cap alpha..,2n..gamma..) reactions. Shell-model calculations including excitations of one particle from the N = 28 core successfully account for the newly observed states and indicate their 2p/sub 3/2/ neutron character in /sup 5/0Ti and /sup 5/2Cr. The experimental results also require configuration mixing of about 20% for the low-lying f/sub 7/2/ states.

High-Spin Neutron Particle-Hole States in Even N=28 Isotones

Multipolarity of the continuum γ-rays in 152Dy and 160Er via linear polarisation measurements

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