Observation of Two-Proton Radioactivity 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:mn>19</mml:mn></mml:mmultiscripts></mml:math>by Tracking the Decay Products

Mukha, I.; Sümmerer, K.; Acosta, L.; Álvarez, M. A. G.; Casarejos, E.; Chatillon, A.; Cortina-Gil, D.; Espino, J. M.; Фомичев, А. С.; García‐Ramos, J. E.; Geißel, H.; Gómez‐Camacho, J.; Grigorenko, L. V.; Hoffmann, J.; Kiselev, O.; Korsheninnikov, A. A.; Kurz, N.; Litvinov, Yu. A.; Martel, I.; Nociforo, C.; Ott, W.; Pfützner, M.; Rodríguez–Tajes, C.; Roeckl, E.; Stănoiu, M.; Weick, H.; Woods, P. J.

doi:10.1103/physrevlett.99.182501

Cited by 142 publications

(114 citation statements)

References 18 publications

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“…Since then, many examples of two-proton decay have been seen from the ground state [6,7,8], as well as from excited states [9]. Because the relevant degrees of freedom are those related to the decay of the two protons, three-body models have been used to theoretically describe these decays.…”

Section: Introductionmentioning

confidence: 99%

Three-body model for the two-neutron emission ofBe16

2017

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Background: While diproton decay was first theorized in 1960 and first measured in 2002, it was first observed only in 2012.The measurement of 14 Be in coincidence with two neutrons suggests that 16 Be does decay through the simultaneous emission of two strongly correlated neutrons.Purpose: In this work, we construct a full three-body model of 16 Be (as 14 Be + n + n) in order to investigate its configuration in the continuum and in particular the structure of its ground state.Method: In order to describe the three-body system, effective n-14 Be potentials were constructed, constrained by the experimental information on 15 Be. The hyperspherical R-matrix method was used to solve the three-body scattering problem, and the resonance energy of 16 Be was extracted from a phase shift analysis.Results: In order to reproduce the experimental resonance energy of 16 Be within this three-body model, a three-body interaction was needed. For extracting the width of the ground state of 16 Be, we use the full width at half maximum of the derivative of the three-body phase shifts and the width of the three-body elastic scattering cross section. Conclusions:Our results confirm a dineutron structure for 16 Be, dependent on the internal structure of the subsystem 15 Be.

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Section: Introductionmentioning

confidence: 99%

Three-body model for the two-neutron emission ofBe16

2017

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“…The decay sequences leading to the 2p + 2α final state are determined for the previously known levels and for a newly found level at E * = 8.4 MeV. A state at E * = 6.57 MeV is shown to undergo two-proton decay to 8 Be g.s. with strong p-p correlations consistent with the 1 S phase shift.…”

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confidence: 99%

“…Excellent cases for sequential decay (e.g., 12 O [4]) and nearly uniform sampling of three-body phase space (e.g., 6 Be g.s. [5][6][7], 16 Ne, 19 Mg [8,9], and 45 Fe [10]) exist. The 45 Fe case is a beautiful example of the single-particle orbital angular momentum of the protons in the parent being impressed on the three-body dynamics [10].…”

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confidence: 99%

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Correlated two-proton decay fromC10

et al. 2008

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The decay of 10 C excited states to the 2p + 2α exit channel has been studied using inelastic excitation of a secondary 10 C beam. The decay sequences leading to the 2p + 2α final state are determined for the previously known levels and for a newly found level at E * = 8.4 MeV. A state at E * = 6.57 MeV is shown to undergo two-proton decay to 8 Be g.s. with strong p-p correlations consistent with the 1 S phase shift. Based on the lack of such correlations for other two-proton decays, this indicates that the correlations are associated with structure of the parent level.

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“…In particular, the recently discovered phenomenon of two-proton (2p) radioactivity, the spontaneous break-up of an atomic nucleus by the emission of two protons, displays unexpectedly long half-lives for all reported 2p precursors, 45 Fe, 54 Zn, 19 Mg, and 94m Ag [1][2][3][4] in comparison with the predictions of a quasiclassical estimate of the emission of 2 He. A quantum-mechanical theory of 2p radioactivity based on a three-body model of nuclear structure of a 2p-decay precursor (which assumes a configuration p + p + "core") [5][6][7] * I.Mukha@gsi.de explains such long half-lives as the result of a decay retardation due to the higher three-body centrifugal barrier in the parent nucleus.…”

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confidence: 85%

Spectroscopy of proton-unbound nuclei by tracking their decay products in-flight: One- and two- proton decays ofF15,Ne

et al. 2010

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A powerful method of investigating proton-unbound nuclear states by tracking their decay products in flight is discussed in detail. To verify the method, four known levels in 15 F, 16 Ne, and 19 Na were investigated by measuring the angular correlations between protons and the respective heavy-ion fragments stemming from the precursor decays in flight. The parent nuclei of interest were produced in nuclear reactions of one-neutron removal from 17 Ne and 20 Mg projectiles at energies of 410-450 A MeV. The trajectories of the respective decay products, 14 O + p + p and 18 Ne + p + p, were measured by applying a tracking technique with microstrip detectors. These data were used to reconstruct the angular correlations of the fragments, which provided information on energies and widths of the parent states. In addition for reproducing properties of known states, evidence for hitherto unknown excited states in 15 F and 16 Ne was found. This tracking technique has an advantage in studies of exotic nuclei beyond the proton drip line measuring the resonance energies and widths with a high precision although by using low-intensity beams and very thick targets.

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Observation of Two-Proton Radioactivity ofMg19by Tracking the Decay Products

Cited by 142 publications

References 18 publications

Three-body model for the two-neutron emission ofBe16

Three-body model for the two-neutron emission ofBe16

Correlated two-proton decay fromC10

Spectroscopy of proton-unbound nuclei by tracking their decay products in-flight: One- and two- proton decays ofF15,Ne

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