Spectroscopy of 34,35Si by β decay: sdfp shell gap and single-particle states

S. Nummela, P. Baumann, E. Caurier, P. Dessagne, A. Jokinen, A. Knipper, G. Le Scornet, C. Miehé, F. Nowacki, M. Oinonen, Z. Radivojevic, M. Ramdhane, G. Walter, and J. Äystö
Phys. Rev. C 63, 044316 – Published 19 March 2001
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Abstract

The 34,35Al β decays have been studied at the CERN online mass separator ISOLDE by β-γ, β-γ-γ, and βnγ measurements in order to corroborate the low-level description of 34Si and to obtain the first information on the level structure of the N=21 isotope 35Si. Earlier observed γ lines in 34Al decay were confirmed and new γ transitions following both β decay and βdelayed neutron emission have been established. The first level scheme of 35Si includes three excited states at 910, 974, and 2168 keV. Indication is found for Jπ=(3/2) and (3/2)+ for the first two excited states, respectively. Beta-decay half-life of T1/2=38.6(4)ms and βdelayed neutron branching value Pn=41(13)% were measured unambiguously. The significance of the single-particle energy determination at N=21, Z=14 for assessing the effective interaction in sdfp shell-model calculations is discussed and illustrated by predictions for different neutron-rich isotopes.

  • Received 12 May 2000

DOI:https://doi.org/10.1103/PhysRevC.63.044316

©2001 American Physical Society

Authors & Affiliations

S. Nummela1,2, P. Baumann3, E. Caurier3, P. Dessagne3, A. Jokinen1,2, A. Knipper3, G. Le Scornet4,5, C. Miehé3, F. Nowacki6, M. Oinonen5, Z. Radivojevic1, M. Ramdhane7, G. Walter3, and J. Äystö1,5

  • 1Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, Finland
  • 2Helsinki Institute of Physics, University of Helsinki, Finland
  • 3IReS, IN2P3-CNRS, Louis Pasteur University, Boîte Postale 28, F-67037 Strasbourg Cedex, France
  • 4CSNSM, F-91405 Campus Orsay, France
  • 5EP-Division, CH-1211 Geneva, CERN, Switzerland
  • 6Theoretical Physics Laboratory, F-67084 Strasbourg Cedex, France
  • 7University of Constantine, Constantine, Algeria

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Vol. 63, Iss. 4 — April 2001

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