Erratum: β decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>31</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Extending the “island of inversion” [Phys. Rev. C<b>72</b>, 044314 (2005)]

Maréchal, F.; Balabanski, D. L.; Borremans, D.; Daugas, J. M.; Santos, F. de Oliveira; Dessagne, P.; Георгиев, Г.; Giovinazzo, J.; Grévy, S.; Himpe, P.; Jollet, C.; Matéa, I.; Neyens, G.; Perrot, F.; Poirier, Éric; Roig, O.; Stănoiu, M.; Stödel, C.; Thomas, J. C.; Turzó, K.; Yordanov, Deyan T.; Caurier, E.; Nowacki, F.; Poves, A.

doi:10.1103/physrevc.76.059902

Cited by 8 publications

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“…The ground state spin and parity of 31 Mg were determined to be J π = 1/2 + in contradiction to previous β-decay studies that yielded a 3/2 + ground state [33]. Maréchal and collaborators performed a complementary β-decay experiment on 31 Mg [16,34] and observed very weak feeding to the 31 Al ground state ( J π = 5/2 + ) and lowest excited states ( J π = 1/2 + , 3/2 + ). Both observations agree well with the 1/2 + ground state of 31 Mg.…”

Section: Motivationmentioning

confidence: 63%

“…The investigated branching ratios yield a ground state transition via M1/E2 with a reduced transition probability that is hindered by a factor of about 10 −4 compared to the 895 keV transition. This is very unlikely due to the similar 2p3h configuration of the ground state and the first 3/2 + excited state at 50 keV [16]. Thus, scenario (iv), i.e.…”

Section: Resultsmentioning

confidence: 94%

“…For this assumption GOSIA calculated a reduced excitation prob- [16,35], so called re-orientation matrix elements, were included into the calculation, using [49] Q αI De-excitation was investigated using the measured branching ratios of 74(12)% for the 895 keV transition, 24(7)% for the 724 keV transition, and an upper limit of <2.6(8)% for the unobserved direct transition to the ground state. Assuming a 3/2 + state at 945 keV its de-excitation would have to proceed via E2 + M1 transitions to the ground state and the 3/2 + state at 50 keV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Recent shell model calculations trace this phenomenon back to the nucleon-nucleon tensor interaction [8]. Investigations in the following nuclei evince that 29,30,32 Ne [9][10][11], 30,31 Na [13,14] and [31][32][33][34]36 Mg [15][16][17][18][19][20][21] are part of this so called "island of inversion" (see Fig. 1).…”

Section: Motivationmentioning

confidence: 99%

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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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Section: Motivationmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

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Coulomb excitation of 31Mg

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“…For N > 17, a growing amount of empirical evidence has been deduced in support of this transition from normal to intruder dominance for magnesium and sodium isotopes. Although 30 Mg (N = 18) is well described without considering cross-shell configurations [5,25] indicating negligible intruder content in the ground state, at N = 19 the low-energy level structure [26,27] and the recently measured magnetic moment of its ground state [11] indicate a strong admixture of intruder configurations in 31 Mg. Therefore, for Z = 12 isotopes there appears to be a sharp transition at N = 19 into the island of inversion.…”

Section: Introductionmentioning

confidence: 99%

Single-neutron knockout from intermediate energy beams ofMg30,32: Mapping the transition into the “island of inversion”

et al. 2008

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The breakdown of the N = 20 magic number in the so-called island of inversion around 32 Mg is well established. Recently developed large-scale shell-model calculations suggest a transitional region between normal-and intruder-dominated nuclear ground states, thus modifying the boundary of the island of inversion. In particular, a dramatic change in single-particle structure is predicted between the ground states of 30 Mg and 32 Mg, with the latter consisting nearly purely of 2p-2h N = 20 cross-shell configurations. Single-neutron knockout experiments on 30,32 Mg projectiles have been performed. We report on a first direct observation of intruder configurations in the ground states of these very neutron-rich nuclei. Spectroscopic factors to low-lying negative-parity states in the knockout residues are deduced and compare well with shell-model predictions.

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Laser spectroscopy in the island of inversion

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Erratum: β decay ofMg31: Extending the “island of inversion” [Phys. Rev. C72, 044314 (2005)]

Cited by 8 publications

References 2 publications

Coulomb excitation of 31Mg

Coulomb excitation of 31Mg

Single-neutron knockout from intermediate energy beams ofMg30,32: Mapping the transition into the “island of inversion”

Laser spectroscopy in the island of inversion

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