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Hadrons and Nuclei


Eur. Phys. J. A 12, 51-55 (2001)

Coulomb energy differences between isobaric analogue states in 70Br and 70Se

Identification of excited states of the Tz=0 nucleus 70Br
G. de Angelis1, T. Martinez1, A. Gadea1, N. Marginean1, E. Farnea1, E. Maglione2, S. Lenzi2, W. Gelletly3, C.A. Ur2, D.R. Napoli1, Th. Kroell1, S. Lunardi2, B. Rubio4, M. Axiotis1, D. Bazzacco2, A.M. Bizzeti Sona5, P.G. Bizzeti5, P. Bednarczyk6, A. Bracco7, F. Brandolini2, F. Camera7, D. Curien6, M. De Poli1, O. Dorvaux6, J. Eberth8, H. Grawe9, R. Menegazzo2, G. Nardelli10, J. Nyberg11, P. Pavan2, B. Quintana12, C. Rossi Alvarez2, P. Spolaore1, T. Steinhart7, I. Stefanescu7, O. Thelen7 and R. Venturelli2

1  Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, via Romea 4, I-35020 Legnaro, Italy
2  Dipartimento di Fisica dell'Università and INFN, Sezione di Padova, I-35141 Padova, Italy
3  Department of Physics, University of Surrey, Guildford, GU2 5XH, UK
4  Instituto de Fisica Corpuscular, E-46100 Valencia, Spain
5  Dipartimento di Fisica dell'Università and INFN, Sezione di Firenze, I-50125 Firenze, Italy
6  Institut de Recherches Subatomiques, CNRS-IN2P3, F-67037 Strasbourg, France
7  Dipartimento di Fisica dell' Università and INFN, Sezione di Milano, I-20133 Milano, Italy
8  Institut für Kernphysik der Universität zu Köln, D-50937 Germany
9  Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
10  Dipartimento di Chimica Fisica dell'Università di Venezia and INFN, Sezione di Padova, Italy
11  Department of Neutron Research, Uppsala University, Uppsala, Sweden
12  Universidad de Salamanca, E-37008 Salamanca, Spain

Giacomo.DeAngelis@lnl.infn.it

(Received: 18 July 2001 / Revised version: 25 September 2001 Communicated by D. Schwalm and J. Äystö)

Abstract
Gamma ray transitions de-exciting states in the N=Z nucleus 70Br have been identified for the first time using the GASP and EUROBALL arrays coupled with ancillary detectors. The level scheme of 70Br has been established by means of particle-gated $\gamma$-$\gamma$ and $\gamma$-$\gamma$-$\gamma$ coincidences. The Coulomb energy differences between isobaric analogue states in 70Br and 70Se show a deviation from the expected behaviour which could be related to dripline effects.

PACS
23.20.Lv - Gamma transitions and level energies.
21.10.Sf - Coulomb energies.
27.50.+e - $59 \leq A \leq 89$ .

© Società Italiana di Fisica, Springer-Verlag 2001

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