2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 10, 275-287

Yrast level structure of the neutron-deficient N = 80 isotones 146Dy, 147Ho and 148Er up to high-spin values

H.A. Roth1, S.E. Arnell1, D. Foltescu1, Ö. Skeppstedt1, J. Blomqvist2, G. de Angelis3, D. Bazzacco4 and S. Lunardi4

1  Department of Physics, Chalmers University of Technology, and the University of Gothenburg, S-41296 Göteborg, Sweden
2  Department of Physics, The Royal Institute of Technology, S-10405 Stockholm, Sweden
3  Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
4  Dipartimento di Fisica dell'Università, and Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy

(Received: 12 January 2001 / Revised version: 10 April 2001 Communicated by D. Schwalm)

Abstract
High-spin level schemes of the N = 80 isotones 146Dy, 147Ho and 148Er have been investigated by in-beam $\gamma$-ray spectroscopic methods using the NORDBALL Compton-suppressed multidetector array including proton and neutron selection. The projectile-target system 58Ni + 92Mo at 260 MeV beam energy has been used to produce the neutron-deficient N = 80 isotones. The previously known schemes have been extended to considerably higher spin and exitation energy, up to $I = 23 \hbar$, $E_x \approx 8.9$ MeV in 146Dy, $I = 53/2 \hbar$, $E_x \approx 8.7$ MeV in 147Ho and $I = 23 \hbar$, $E_x \approx 9.6$ MeV in 148Er. The results are discussed in terms of the spherical shell model. Many of the levels can be described within this framework.

PACS
23.20.Lv - $\gamma$ transitions and level energies.
25.70.Jj - Fusion and fusion-fission reactions.
21.60.Cs - Shell model.
27.60.+j - $90 \le A \le 149$ .

© Società Italiana di Fisica, Springer-Verlag 2001