Two-proton radioactivity and three-body decay. II. Exploratory studies of lifetimes and correlations

Grigorenko, L. V.; Zhukov, M. V.

doi:10.1103/physrevc.68.054005

Cited by 133 publications

(198 citation statements)

References 31 publications

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“…Proton-proton correlations were observed for the two-proton decays of the ground states of 19 Mg and 16 Ne. The trajectories of the respective decay products, 17 Ne+p+p and 14 O+p+p, were measured by using a tracking technique with microstrip detectors.…”

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confidence: 93%

“…In the present paper, we study for the first time the p-p correlations in sd shell nuclei via examples of the 2p decays of 19 Mg and 16 Ne. These nuclei with very different half lives (T 1/2 ≈ 4 · 10 −9 s [10] and T 1/2 ≈ 4 · 10 −19 s [11], respectively) and presumably different spectroscopic properties may serve as reference cases illuminating the nuclear structure of other possible 2p emitters with sdwave configuration.…”

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confidence: 99%

“…[10,11,12,13,14,15,16] and this work. The ground states of both isotopes decay only by simultaneous 2p emission while their excited states are open for sequential 1p decays via intermediate unbound states in 15 F and 18 Na.The quantum-mechanical theory of 2p radioactivity which uses a three-body model [17,18,19], predicts the p-p correlations to be strongly influenced by nuclear structure together with Coulomb and three-body centrifugal barriers. In particular, the newly discovered 2p-radioactivity of 19 Mg [10] was predicted to be characterized by p-p correlations which reflect the sd configurations of the valence protons [20].…”

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confidence: 99%

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Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
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Proton-proton correlations were observed for the two-proton decays of the ground states of 19 Mg and 16 Ne. The trajectories of the respective decay products, 17 Ne+p+p and 14 O+p+p, were measured by using a tracking technique with microstrip detectors. These data were used to reconstruct the angular correlations of fragments projected on planes transverse to the precursor momenta. The measured three-particle correlations reflect a genuine three-body decay mechanism and allowed us to obtain spectroscopic information on the precursors with valence protons in the sd shell.PACS numbers: 21.10.-k; 21.45.+v; 23.50.+z The recently discovered two-proton (2p) radioactivity is a specific type of genuine three-particle nuclear decays. It occurs when a resonance in any pair of fragments is located at higher energies than in the initial three-body (p+p+"core") nucleus, and thus simultaneous emission of two protons is the only decay channel. Three-body systems have more degrees of freedom in comparison with two-body systems, hence additional observables appear. In the case of 2p emission, the energy spectra of single protons become continuous, and proton-proton (p-p) correlations are available, which makes them a prospective probe for nuclear structure or/and the decay mechanism. For example, the first p-p correlations observed in the 2p radioactivity of 94m Ag have revealed strong proton yields either in the same or opposite directions which called for a theory of 2p emission from deformed nuclei [1]. Two-proton emission can also occur from short-lived nuclear resonances or excited states (see, e.g., [2,3,4]). Though in this case the mechanism of 2p emission may depend on the reaction populating the parent state, such nuclei can be easily studied in-flight. E.g., the cases of 6 Be [2, 5] and 16 Ne [6]were studied by analyzing their p-p correlations in the framework of a three-body partialwave analysis developed for three-particle decays of light nuclei. In particular, the study of 6 Be revealed the existence of three-particle p+p+α correlations [2] which matched the three-body components found theoretically in the p-shell structure of 6 Be [7]. Very recently, p-p correlations were also observed in 2p radioactivity of 45 Fe [8,9] where both the lifetime and p-p correlations were found to reflect the structure of pf -shell 2p precursors [9]. Such a way of obtaining spectroscopic information is a novel feature compared to studies of two-particle decays.In the present paper, we study for the first time the p-p correlations in sd shell nuclei via examples of the 2p decays of 19 Mg and 16 Ne. These nuclei with very different half lives (T 1/2 ≈ 4 · 10 −9 s [10] and T 1/2 ≈ 4 · 10 −19 s [11], respectively) and presumably different spectroscopic properties may serve as reference cases illuminating the nuclear structure of other possible 2p emitters with sdwave configuration.The decay properties of the 16 Ne and 19 Mg ground states and the related resonances in 15 F and 18 Na are shown in Fig. 1 which compiles the data from Refs....

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confidence: 93%

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Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
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“…The configuration of both valence protons is assumed to be a mixture of f 2 and p 2 contributions. The relative intensity of this smaller bump reflects the contribution of the p 2 component [42]. Obviously more statistics are needed to establish the experimental distribution for 48 Ni.…”

Section: Two-proton Radioactivitymentioning

confidence: 99%

Proton spectroscopy ofNi48,Fe46, andCr
Pomorski
¹
,
Pfützner
²
,
Dominik
³

et al. 2014
Phys. Rev. C
75
1
45
0
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Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48 Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48 Ni, including four events of twoproton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48 Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of β-delayed protons emitted in the decays of 44 Cr and 46 Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44 Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the β2p decay of 46 Fe, based on one clear event, is shown.

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“…Different structural configurations of the parent nucleus give rise to different values for the width and half-life, as well as different ways of sharing the energy between the three particles. It is only through the comparison of model calculations to the data that insights into the nature of the decay can be obtained [10,11].…”

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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Two-proton radioactivity and three-body decay. II. Exploratory studies of lifetimes and correlations

Cited by 133 publications

References 31 publications

Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
View full text Add to dashboard Cite

Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
View full text Add to dashboard Cite

Proton spectroscopy ofNi48,Fe46, andCr
Pomorski
¹
,
Pfützner
²
,
Dominik
³

et al. 2014
Phys. Rev. C
75
1
45
0
View full text Add to dashboard Cite

Three-body model for the two-neutron emission ofBe16

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Two-proton radioactivity and three-body decay. II. Exploratory studies of lifetimes and correlations

Cited by 133 publications

References 31 publications

Proton-proton correlations observed in two-proton decay ofMg19andNe16Mukha1, Grigorenko2, Sümmerer3 et al. 2008Phys. Rev. C746350View full textAdd to dashboardCite

Proton-proton correlations observed in two-proton decay ofMg19andNe16Mukha1, Grigorenko2, Sümmerer3 et al. 2008Phys. Rev. C746350View full textAdd to dashboardCite

Proton spectroscopy ofNi48,Fe46, andCrPomorski1, Pfützner2, Dominik3 et al. 2014Phys. Rev. C751450View full textAdd to dashboardCite

Three-body model for the two-neutron emission ofBe16

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Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
View full text Add to dashboard Cite

Proton-proton correlations observed in two-proton decay ofMg19andNe16
Mukha¹,
Grigorenko²,
Sümmerer³
et al. 2008
Phys. Rev. C
74
6
35
0
View full text Add to dashboard Cite

Proton spectroscopy ofNi48,Fe46, andCr
Pomorski
¹
,
Pfützner
²
,
Dominik
³

et al. 2014
Phys. Rev. C
75
1
45
0
View full text Add to dashboard Cite