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Pritychenko, B.; Glasmacher, T.; Brown, B. A.; Cottle, P. D.; Ibbotson, R. W.; Kemper, K. W.; Scheit, H.

doi:10.1103/physrevc.63.047308

Cited by 23 publications

(75 citation statements)

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“…1. None of the 22 gamma transitions from 34 Al observed in this experiment are found among the previously reported lines of 34 Al (388, 433, 597, 706, 916 and 1206 keV from [5], and 657 keV from [6]). The direct γ transition 1 + → 4 − was not observed, most likely as a result of an excitation energy significantly smaller than the 550-keV value predicted by the shell-model calculations in [1], thus leading to a very small γ branch from the 1 + β -isomeric state.…”

Section: Resultscontrasting

confidence: 63%

“…Such an example is the heaviest nucleus inside this 'island' - 34 Mg, whose first beta-gamma spectroscopy was performed in our recent experiment at ISOLDE [4]. The daughter nucleus -34 Al -had no experimental level scheme, though some transitions were assigned to this nucleus [5,6]. Moreover a low spin beta-isomer of unknown excitation energy was evidenced at GANIL [1], presumably the 1 + state of 1hω configuration [4,7], populating strongly the deformed 0 + 2 isomer in 34 Si of intruder origin.…”

Section: Introductionmentioning

confidence: 99%

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Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

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et al. 2015

AIP Conference Proceedings

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Abstract.The results of the IS530 experiment at ISOLDE revealed new information concerning several nuclei close to the N ≈ 20 'Island of Inversion' -34 Mg, 34 Al, 34 Si. The half-life of 34 Mg was found to be three times larger than the adopted value (63(1) ms instead of 20(10) ms). The beta-gamma spectroscopy of 34 Mg performed for the first time in this experiment, led to the first experimental level scheme for 34 Al, also showing that the full beta strength goes through the predicted 1 + isomer in 34 Al [1] and/or excited states that deexcite to it. The subsequent beta-decay of the 1 + isomer in 34 Al allowed the observation of new gamma lines in 34 Si, (tentatively) associated with low-spin high-energy excited states previously unobserved.

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Section: Resultscontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

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Rotaru

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et al. 2015

AIP Conference Proceedings

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“…In the N = 20 region, as we shall illustrate, the Na isotopes give indispensable information on this shell evolution: (i) specific Na isotopes provide us with clues of a narrow N = 20 shell gap, (ii) with odd Z, their ground-state properties can be directly examined by nonvanishing electromagnetic moments, and (iii) experimental data have been recently accumulated about the mass [21], moment [22,23], ␥-ray spectrum and transition by the Coulomb excitation [24,25], etc. Thus, we carry out shell-model studies on Na isotopes from N =16 to 20.…”

Section: Outline Of the Shell Model Calculationmentioning

confidence: 99%

Onset of intruder ground state in exoticNaisotopes and evolution of theN=20shell gap

et al. 2004

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The onset of intruder ground states in Na isotopes is investigated by comparing experimental data and shell-model calculations. This onset is one of the consequences of the disappearance of the N = 20 magic structure, and the Na isotopes are shown to play a special role in clarifying the change of this magic structure. Both the electromagnetic moments and the energy levels clearly indicate an onset of ground state intruder configurations at neutron number N = 19 already, which arises only with a narrow N = 20 shell gap in Na isotopes resulting from the spin-isospin dependence of the nucleon-nucleon interaction (as compared to a wider gap in stable nuclei like 40 Ca). It is shown why the previous report based on the mass led to a wrong conclusion.

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“…The collective properties of excited states were the subject of a Coulomb excitation experiment at REX-ISOLDE, CERN, employing a radioactive 31 Mg beam. De-excitation γ -rays were detected by the MINIBALL γ -spectrometer in coincidence with scattered particles in a segmented Si-detector.…”

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confidence: 99%

Coulomb excitation of 31Mg

et al. 2011

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Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Seidlitz, M., Muecher, D., Reiter, P., Bildstein, V., Blazhev, A., Bree, N., ... Wiens, A. (2011). Coulomb excitation of , 181-186. https://doi.org/10.1016/j.physletb.2011.05.009 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Download date: 11-04-2019Physics Letters B 700 (2011) © 2011 Elsevier B.V. All rights reserved. MotivationShell structure is one of the most important frameworks for understanding nuclear structure and the properties of atomic nuclei. Recent experimental and theoretical findings indicate that magic numbers are subject to the proton-to-neutron ratio and new magic numbers are revealed when going to more exotic nuclei. Such a new magic number was proposed at N = 16 for some nuclei be- ground state for these nuclei [6]. Later shell model calculations by Warburton et al. [7] showed that the 1 f 7/2 orbital becomes lower in energy, reducing the sd shell gap and an anomalous inverted level structure was proposed, which is based on 2-particle 2-hole (2p2h) neutron cross shell configurations in the ground state. ExperimentThe Coulomb excitation experiment was performed at the REX-ISOLDE facility at CERN [37,38] The scattered beam and recoiling target nuclei were detected by a CD-shaped 500 μm thick double sided silicon strip detector (DSSSD), consisting of four identical quadrants [40]. Each quadrant comprised 16 annular strips at the front side and 24 radial strips at the back side for identification and reconstruction of the trajectories of the scattered nuclei. The detector covered forward angles between 16.4 • and 53.3 • in the laboratory system. De-excitation γ -rays following Coulomb excitation of projectile and target nuclei were detected by the MINIBALL γ -spectrometer, consisting of eight triple cluster detectors in close geometry, each containing three 6-fold segmented HPGe crystals [41]. The photopeak efficiency of the array at 1.3 MeV was 8% after cluster addback. The high segmentation of the setup ensured a proper Doppler correction for in-flight γ -ray emission at v/c ∼ 8% by combining the angular information of the γ -ray with the direction and velocity of the scattered beam particle that was detected in coincidence.Two additional particle detectors were used downstream after the scattering chamber to monitor the position of the beam and M. Seidlitz et al. / Physics Letters B ...

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Shape coexistence on the boundary of the “island of inversion”: Exotic beam spectroscopy of34Al

Cited by 23 publications

References 13 publications

Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

Onset of intruder ground state in exoticNaisotopes and evolution of theN=20shell gap

Coulomb excitation of 31Mg

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