New structure information on 30Mg, 31Mg and 32Mg

H. Mach; L. M. Fraile; O. Tengblad; R. Boutami; C. Jollet; W. A. Płóciennik; D. T. Yordanov; M. Stanoiu; M. J. G. Borge; P. A. Butler; J. Cederkäll; Ph. Dessagne; B. Fogelberg; H. Fynbo; P. Hoff; A. Jokinen; A. Korgul; U. Köster; W. Kurcewicz; F. Marechal; T. Motobayashi; J. Mrazek; G. Neyens; T. Nilsson; S. Pedersen; A. Poves; B. Rubio; E. Ruchowska

doi:10.1140/epjad/i2005-06-159-0

2022 Impact factor 2.7

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2005) 25: 105-109
https://doi.org/10.1140/epjad/i2005-06-159-0

ENAM 2004

New structure information on ³⁰Mg, ³¹Mg and ³²Mg

H. Mach¹^*, L. M. Fraile²^,3, O. Tengblad⁴, R. Boutami⁴, C. Jollet⁵, W. A. Płóciennik⁶, D. T. Yordanov⁷, M. Stanoiu⁸, M. J. G. Borge⁴, P. A. Butler²^,9, J. Cederkäll²^,10, Ph. Dessagne⁵, B. Fogelberg¹, H. Fynbo¹¹, P. Hoff¹², A. Jokinen¹³, A. Korgul¹⁴, U. Köster², W. Kurcewicz¹⁴, F. Marechal⁵, T. Motobayashi¹⁵, J. Mrazek¹⁶, G. Neyens⁷, T. Nilsson², S. Pedersen¹¹, A. Poves¹⁷, B. Rubio¹⁸, E. Ruchowska⁶ and the ISOLDE Collaboration

¹ Department of Radiation Sciences, Uppsala University, S-61182, Nyköping, Sweden
² ISOLDE, Division EP, CERN, CH-1211, Geneva, Switzerland
³ Universidad Complutense, E-28040, Madrid, Spain
⁴ Instituto de Estructura de la Materia, CSIC, E-28006, Madrid, Spain
⁵ Institut de Recherches Subatomiques, IN2P3-CNRS, F-67037, Strasbourg, Cedex 2, France
⁶ The Andrzej Sołtan Institute for Nuclear Studies, 05-400, Świerk, Poland
⁷ K.U. Leuven, IKS, Celestijnenlaan 200 D, 3001, Leuven, Belgium
⁸ IPN, IN2P3-CNRS and Université Paris-Sud, F-91406, Orsay Cedex, France
⁹ Oliver Lodge Laboratory, University of Liverpool, L69 3BX, Liverpool, United Kingdom
¹⁰ Department of Physics, Lund University, S-22100, Lund, Sweden
¹¹ Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000, Aarhus C, Denmark
¹² Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315, Oslo, Norway
¹³ Department of Physics, University of Jyväskylä, P.O. Box 35 (yfl), FIN-40014, Finland
¹⁴ Institute of Experimental Physics, Warsaw University, Hoża 69, PL 00-681, Warsaw, Poland
¹⁵ RIKEN, Hirosawa 2-1, 351-0198, Wako, Saitama, Japan
¹⁶ Nuclear Physics Institute, 25068, Rez, Czech Republic
¹⁷ Departamento de Fısica Teórica C-XI, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
¹⁸ Instituto de Fısica Corpuscular, CSIC University of Valencia, E-46071, Valencia, Spain

^* e-mail: Henryk.Mach@studsvik.uu.se

Received: 16 January 2005
Accepted: 31 March 2005
Published online: 19 July 2005

Abstract

The fast timing βγγ(t) method was applied to investigate the level lifetimes in ^30,31,32Mg. Levels in Mg have been populated in β and β-delayed neutron emission of Na at the ISOLDE facility. From the γγ coincidences a number of new states have been identified and new level schemes were constructed for ^30,31,32Mg. The following preliminary half lives have been determined: T _1/2 = 3.9(4) ns for the 1789 keV state in ³⁰Mg, T _1/2 = 133(8) ps and 10.5(8) ns for the 221 keV and 461 keV states in ³¹Mg, respectively, and T _1/2 = 16(4) ps for the 885 keV level in ³²Mg. The 1789 keV level was established as a candidate for the intruder 0⁺ configuration in ³⁰Mg with a possible strong E0 branch to the ground state.