Pionic Double Charge Exchange on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">N</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mi mathvariant="italic">Z</mml:mi></mml:math>Doubly Closed Shell Nuclei

Föhl, K.; Bilger, R.; Clement, H.; Gräter, J.; Meier, R.; Pätzold, J.; Schapler, D.; Wagner, G. J.; Wilhelm, Oliver; Kluge, W.; Wieser, R.; Schepkin, M.; Abela, R.; Renker, D.

doi:10.1103/physrevlett.79.3849

Cited by 33 publications

(10 citation statements)

References 17 publications

(42 reference statements)

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“…Information on higher-lying excited states of 16 Ne is very sparse, apart from the observation of another excited state in the 14 O+p+p exit channel at E * ∼ 9.07 MeV [2,6,7] and the possibility of a second 0 + state at E * ∼ 2.1 MeV [8]. At even higher excitation energies, the 13 N+p+p+p exit channel opens and from its measured invariant-mass spectrum we find two new excited states.…”

Section: Introductionmentioning

confidence: 84%

Interplay between sequential and prompt two-proton decay from the first excited state ofNe16

et al. 2015

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The first-excited, J π = 2 + state of 16 Ne at E * = 1.69(2) MeV is well populated in neutron knockout reactions with a 17 Ne beam and the correlations between the momenta of the three final fragments following 2p decay were measured. The correlation pattern showed aspects of both sequential and diproton-like decay, which were reproduced in three-body 14 O+p+p calculations. These calculations suggest that interference between these processes is responsible for the observed features which can be described in terms of a "tethered decay mechanism". The intrinsic width of this state was constrained to be from 100 to 250 keV. Higher excited states populating the 13 N+p+p+p exit channel were found at E

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Section: Introductionmentioning

confidence: 84%

Interplay between sequential and prompt two-proton decay from the first excited state ofNe16

et al. 2015

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“…The relative-energy spectrum, which is shown in Fig. 3(a), features distinct resonances belonging to 16 Ne. The resonance positions and, in some cases, the widths are known from earlier experiments KEK78, BUR80,WOO83,FOH97,MUK09.…”

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confidence: 99%

First Observation of the Unbound NucleusNe15

Wamers¹,

Marganiec²,

Aksouh³

et al. 2014

Phys. Rev. Lett.

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We report on the first observation of the unbound proton-rich nucleus 15 Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17 Ne. The 15 Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13 O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2 − and 1 − states in 14 F is observed. The 15 Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13 O with a 63(5)% ð1s 1=2 Þ 2 component.

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“…decay of the sd-shell nucleus 16 Ne where the Coulombic effects appear to be strong enough to be observable. Known experimentally for several decades [16], 16 Ne has remained poorly investigated with just a few experimental studies [17][18][19][20]. However, interest has returned recently with the decay of 16 Ne measured in relativistic neutron-knockout reactions from a 17 Ne beam [21,22].…”

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confidence: 99%

Observation of Long-Range Three-Body Coulomb Effects in the Decay ofNe16

et al. 2014

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The interaction of an E/A=57.6-MeV 17 Ne beam with a Be target was used to populate levels in 16 Ne following neutron knockout reactions. The decay of 16 Ne states into the three-body 14 O+p+p continuum was observed in the High Resolution Array (HiRA). For the first time for a 2p emitter, correlations between the momenta of the three decay products were measured with sufficient resolution and statistics to allow for an unambiguous demonstration of their dependence on the long-range nature of the Coulomb interaction. Contrary to previous measurements, our measured limit Γ < 80 keV for the intrinsic decay width of the ground state is not in contradiction with the small values (of the order of keV) predicted theoretically.PACS numbers: 25.10.+s, 23.50.+z, 21.60.Gx, 27.20.+n Introduction -Two-proton (2p) radioactivity [1] is the most recently discovered type of radioactive decay. It is a facet of a broader three-body decay phenomenon actively investigated within the last decade [2]. In binary decay, the correlations between the momenta of the two decay products are entirely constrained by energy and momentum conservation. In contrast for three-body decay, the corresponding correlations are also sensitive to the internal nuclear structure of the decaying system and the decay dynamics providing, in principle, another way to constrain this information from experiment. In 2p decay, as the separation between the decay products becomes greater than the range of the nuclear interaction, the subsequent modification of the initial correlations is determined solely by the Coulomb interaction between the decay products. As the range of the Coulomb force is infinite, its long-range contribution to the correlations can be substantial, especially, in heavy 2p emitters.

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Pionic Double Charge Exchange onN=ZDoubly Closed Shell Nuclei

Cited by 33 publications

References 17 publications

Interplay between sequential and prompt two-proton decay from the first excited state ofNe16

Interplay between sequential and prompt two-proton decay from the first excited state ofNe16

First Observation of the Unbound NucleusNe15

Observation of Long-Range Three-Body Coulomb Effects in the Decay ofNe16

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