In-Beam<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-Ray Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>34</mml:mn><mml:mo>,</mml:mo><mml:mn>36</mml:mn><mml:mo>,</mml:mo><mml:mn>38</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Merging the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:m

Doornenbal, P.; Scheit, H.; Takeuchi, Satoshi; Aoi, N.; Li, Kuoang; Matsushita, M.; Steppenbeck, D.; Wang, Handing; Baba, H.; Crawford, H. L.; Hoffman, C. R.; Hughes, R. O.; Ideguchi, E.; Kobayashi, N.; Kondo, Y.; Lee, Jenny; Michimasa, S.; Motobayashi, T.; Sakuraï, H.; Takechi, M.; Togano, Y.; Winkler, R.; Yoneda, K.

doi:10.1103/physrevlett.111.212502

Cited by 106 publications

(66 citation statements)

References 35 publications

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“…With these angular cuts applied, the simulated efficiencies for 1-MeV γ rays emitted at β = 0.6 were 15% and 12%, respectively. The 2 [17,18,21,23]. Detector response curves were simulated with GEANT4 and took into account the intrinsic resolution of DALI2, the energy loss inside the target, and the γ -ray prolate (oblate) angular distributions for Coulomb (nuclear) excitation [34].…”

Section: Resultsmentioning

confidence: 99%

“…Further investigations revealed also a large B(E2)↑ for 34 Mg [15,16], while two-proton knockout reactions showed a low E(2 + 1 ) for 36 Mg and that its ground state is dominated by 2 ω configurations [17]. Recently, the knowledge of the E(2 + 1 ) and E(4 + 1 ) values in the magnesium isotopes was extended up to N = 26, featuring a remarkable stability in the level energies [18]. These findings were interpreted as a merged N = 20 and N = 28 shell quenching, in agreement with shell-model calculations [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

et al. 2016

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The transition strengths of the first-excited 2 + states and deformation lengths of the nuclei 30 Ne and 36 Mg were determined via Coulomb-and nuclear-force-dominated inelastic scattering at intermediate energies. Beams of these exotic nuclei were produced at the RIKEN Radioactive Isotope Beam Factory and were incident on lead and carbon targets at energies above 200 MeV/u. Absolute excitation cross sections on the lead target yielded reduced transition probabilities of 0.0277(79) and 0.0528(121) e 2 b 2 , while the measurements with the carbon target revealed nuclear deformation lengths of δ N = 1.98(11) and 1.93(11) fm for 30 Ne and 36 Mg, respectively. Corresponding quadrupole deformation parameters of β 2 ∼ 0.5 from the two probes were found comparable in magnitude, showing no indication for a reduction in deformation along isotopic and isotonic chains from 32 Mg towards the neutron drip-line. Comparisons to shell-model calculations illustrate the importance of neutron excitations across the N = 20 shell for 30 Ne and suggest that shallow maximums of collectivity may occur around N = 22 and 24 along the neon and magnesium isotopic chains, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

et al. 2016

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“…The peak at 482 keV is the strongest amongst all peaks in the coincidence spectrum. As nucleon knockout reactions are known to populate yrast states effectively [9,[37][38][39][40], the 482-keV transition is a plausible candidate for the 4…”

Section: Resultsmentioning

confidence: 99%

Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82<

et al. 2016

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The low-lying level structures of nuclei in the vicinity of 78 Ni were investigated using in-beam γ -ray spectroscopy to clarify the nature of the nuclear magic numbers Z = 28 and N = 50 in systems close to the neutron drip line. Nucleon knockout reactions were employed to populate excited states in 80 were deduced to be 1.32(3) and 1.12 +80 −60 , respectively. These results imply that 80 Zn can be described in terms of two-proton configurations with a 78 Ni core and are consistent with a robust N = 50 magic number along the Zn isotopic chain. These observations, therefore, indicate a persistent N = 50 shell closure in nuclei far from the line of β stability, which in turn suggests a doubly magic structure for 78 Ni.

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“…For even-even nuclei populated in (p,2p) reactions (see, e.g., Refs. [44][45][46][47]), the strongest observed γ decay in the spectrum stems from the transition (2 + 1 ) → 0 + 1 , while the second strongest intensity typically originates from the (4 + 1 ) → (2 + 1 ) transition. The inset in Fig.…”

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confidence: 97%

Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

Lettmann¹,

Werner²,

Pietralla³

et al. 2017

Phys. Rev. C

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γ -ray transitions between low-spin states of the neutron-rich 84,86,88 Ge were measured by means of in-flight γ -ray spectroscopy at 270 MeV/u. Excited 6 + 1 , 4 + 1,2 , and 2 + 1,2 states of 84,86 Ge and 4 + 1 and 2 + 1,2 states of 88 Ge were observed. Furthermore, a candidate for a 3 + 1 state of 86 Ge was identified. This state plays a key role in the discussion of ground-state triaxiality of 86 Ge, along with other features of its low-energy level scheme. A new region of triaxially deformed nuclei is proposed in the Ge isotopic chain.

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In-Beamγ-Ray Spectroscopy ofMg34,36,38: Merging the

Cited by 106 publications

References 35 publications

Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82<

Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

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