Eur. Phys. J. A (2006) 27: 301-312
https://doi.org/10.1140/epja/i2006-10007-y

Nuclear Structure and Reactions

Gamma-ray spectroscopy of the nucleus ¹³⁹Ce

Horia Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG-6, R-76900, Bucharest, Romania

^* e-mail: bucurescu@tandem.nipne.ro

Received: 6 February 2006
Accepted: 28 March 2006
Published online: 18 April 2006

Abstract

Gamma-ray coincidence techniques are used to determine new level structures in the N = 81 nucleus ¹³⁹Ce, at low spins and excitation energies with the ¹³⁹La(p, nγ) reaction at 5.0 and 6.0MeV incident energy, and at high spins with the ¹³⁰Te(¹²C, 3nγ) reaction at 50.5MeV, respectively. Lifetime determinations are also made in the (p, nγ) reaction with the centroid DSA method. The observed level structures are discussed by comparison with existing calculations and with those in the neighbouring nucleus ¹⁴⁰Ce.