Eur. Phys. J. A (2005) 25: 23-26
https://doi.org/10.1140/epjad/i2005-06-189-6

ENAM 2004

New mass measurements at the neutron drip-line

¹ GANIL, BP 55027, F-14075, Caen Cedex 5, France
² Nuclear Physics Institute ASCR, 25068, Rez, Czech Republic
³ Nuclear Physics Department, University of Surrey, GU27XH, Guilford, UK
⁴ Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK
⁵ CEA/DSM/DAPNIA/SPHN, CEN Saclay, F-91191, Gif-sur Yvette, France
⁶ LPC - ISMRA and University of Caen, F-6704, Caen, France
⁷ IReS - Strasbourg, 23 rue du loess, BP 28, F-67037, Strasbourg, France
⁸ University of S ao Paulo IFUSP, C.P. 66318, 05315-970, S ao Paulo, Brazil
⁹ FLNR, JINR Dubna, P.O. Box 79, 101000, Moscow, Russia
¹⁰ LNS-INFN, 44 S. Sofia, I-95129, Catania, Italy
¹¹ Collège de France, 11 Place Marcelin Berthelot, F-75231, Paris Cedex 05, France
¹² LPTN Faculty of Sciences, El Jadida BP 20, 24000, El Jadida, Morocco
¹³ Physics Division, Argonne National Laboratory, 9700 S. Cass Av., 60439, Argonne, IL, USA

^* e-mail: savajols@ganil.fr

Received: 5 May 2005
Accepted: 5 May 2005
Published online: 11 August 2005

Abstract

A new SPEG mass measurement experiment has been performed to determine masses closer to the neutron drip-line in the mass region A ∼ 10-50. The precision of 37 masses has been improved and 8 masses were measured for the first time. The region covered was motivated by the study of shell structure and of shape coexistence in the region of closed shells N = 20 and N = 28. The evolution of the two neutron separation energies and the shell correction energy have been studied as a function of the neutron number. The results thus obtained provide a means of identifying, in exotic nuclei, new nuclear structure effects that are well illustrated by the changes of the conventional magic structure.