Observation of narrow states in nuclei beyond the proton drip line:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">F</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>15</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ne</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>16</mml:mn></mml:mrow></m

The dynamic mechanism of the Thomas-Ehrman shift in three-cluster systems is studied by example of 16 Ne and 16 C isobaric mirror partners. We predict configuration mixings for 0 + and 2 + states in 16 Ne and 16 C. Large isospin symmetry breaking on the level of wave function component weights is demonstrated for these states and discussed as three-body mechanism of Thomas-Ehrman shift. It is shown that the description of the Coulomb displacement energies requires a consistency among three parameters: the 16 Ne decay energy ET , the 15 F ground state energy Er, and the configuration mixing parameters for the 16 Ne/ 16 C 0 + and 2 + states. Basing on this analysis we infer the 15 F 1/2 + ground state energy to be Er = 1.39 − 1.42 MeV.

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“…8. The consistency range for experiment [19] E r = 1.27 − 1.4 MeV is quite broad and somehow overlaps with that found for the data of Ref. [9].…”

Section: The 15 F Ground State Issuesupporting

confidence: 86%

Thomas-Ehrman effect in a three-body model: TheNe16case

Grigorenko

Golubkova²,

Zhukov³

2015

Phys. Rev. C

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“…Similar correlation studies were also attempted for 54 Zn and 48 Ni [8,9], but due to very small statistics no conclusions on the decay mechanism could be drawn. The three-body decay mechanisms of short-living "democratic" 2p emitters 6 Be and 16 Ne were studied in broad energy ranges [10][11][12]. The first case of 2p radioactivity in an s-d shell was found in the 19 Mg isotope by measuring its decay in flight with a novel tracking technique [13].…”

mentioning

confidence: 99%

“…The three-body decay mechanisms of short-living "democratic" 2p emitters 6 Be and 16 Ne were studied in broad energy ranges [10][11][12]. The first case of 2p radioactivity in an s-d shell was found in the 19 Mg isotope by measuring its decay in flight with a novel tracking technique [13]. In spite of the experimental advances, most 2p-decay precursors remain unexploited.…”

mentioning

confidence: 99%

“…Angular θðp-pÞ and θðHI-pÞ correlations were obtained with a resolution of 1 mrad. The uncertainty of the 2p-precursor half-life, derived from the uncertainty of the measured center of gravity of the decay-vertex distribution [13], was 3-5 ps. As was shown in Ref.…”

mentioning

confidence: 99%

“…As was shown in Ref. [16] for the known states in 15 F, 16 Ne, and 19 Na, the identification of 2p-precursor states as well as their decay energies and widths can be determined by analyzing the angular correlations of the decay products.…”

mentioning

confidence: 99%

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Observation and Spectroscopy of New Proton-Unbound IsotopesAr30andCl2

Mukha¹,

Grigorenko²,

Xu³

et al. 2015

Phys. Rev. Lett.

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Previously unknown isotopes30 Ar and 29 Cl have been identified by measurement of the trajectories of their in-flight decay products 28 S þ p þ p and 28 S þ p, respectively. The analysis of angular correlations of the fragments provided information on decay energies and the structure of the parent states. The ground states of 30 Ar and 29 Cl were found at 2.25 þ0.15 −0.10 and 1.8 AE 0.1 MeV above the two-and one-proton thresholds, respectively. The lowest states in 30 Ar and 29 Cl point to a violation of isobaric symmetry in the structure of these unbound nuclei. The two-proton decay has been identified in a transition region between simultaneous two-proton and sequential proton emissions from the 30 Ar ground state, which is characterized by an interplay of three-body and two-body decay mechanisms. The first hint of a fine structure of the two-proton decay of 30 Ar Ã ð2 þ Þ has been obtained by detecting two decay branches into the ground and first-excited states of the 28 S fragment.

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