<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>19</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>two-proton decay lifetime

Voss, P.; Baumann, T.; Bazin, D.; Dewald, Α.; Iwasaki, H.; Miller, D.; Ratkiewicz, A.; Spyrou, A.; Starosta, K.; Thoennessen, M.; Vaman, C.; Tostevin, J. A.

doi:10.1103/physrevc.90.014301

Cited by 13 publications

(6 citation statements)

References 36 publications

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“…is measured as an upper limit T 1=2 < 10 ps, which does not contradict the literature value of 4.0(15) ps [13]. Recently, the 19 Mg half-life was remeasured by another method as 1.2-4.4 ps [20].…”

mentioning

confidence: 82%

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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mentioning

confidence: 82%

Observation and Spectroscopy of New Proton-Unbound IsotopesAr30andCl2

Mukha¹,

Grigorenko²,

Xu³

et al. 2015

Phys. Rev. Lett.

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“…This represents a total systematic uncertainty of 0.05 cm/ns in the V rel distribution, which corresponds to a 1.7 ps systematic uncertainty, and indicates a finite halflife of 26 O at 95% confidence level. The systematic uncertainty was also estimated through examining the neutron decay of the first excited state of 23 O * → 22 O+n, which was also populated during the experiment from the 27 F beam. Thus, the 9 Be target, Bρ of the dipole, MoNA configuration, Sweeper detector settings, and calibrations were identical to the 26 O measurement and can provide an estimate of any unknown systematic errors.…”

Section: Measuredmentioning

confidence: 99%

“…Thus, the 9 Be target, Bρ of the dipole, MoNA configuration, Sweeper detector settings, and calibrations were identical to the 26 O measurement and can provide an estimate of any unknown systematic errors. Since the decay of 23 O should not have a long-lived component, the relative velocity spectrum should not be shifted away from V rel = 0 (see Fig. 4).…”

Section: Measuredmentioning

confidence: 99%

“…The 26 O lifetime is therefore too short to be observed by traditional implantation/decay methods, where lifetimes down to several hundred nanoseconds have been achieved using digital electronics [21], and must be measured in-flight. For two-proton emission, reconstruction of the decay vertex by Mukha et al [22] and an adaption of the Recoil Distance Doppler Shift (RDDS) technique by Voss et al [23] were used to measure the lifetime inflight of 19 Mg. In this letter, the lifetime of 26 O is extracted using a novel technique based on the velocity difference of the emitted neutrons and residual charged fragment traveling through a thick target.…”

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confidence: 99%

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Study of Two-Neutron Radioactivity in the Decay ofO26

et al. 2013

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A new technique was developed to measure the lifetimes of neutron unbound nuclei in the picosecond range. The decay of 26 O→ 24 O + n + n was examined as it had been predicted to have an appreciable lifetime due to the unique structure of the neutron-rich oxygen isotopes. The half-life of 26 O was extracted as 4.5 +1.1 −1.5 (stat.) ± 3(sys.) ps. This corresponds to 26 O having a finite lifetime at an 82% confidence level and, thus, suggests the possibility of two-neutron radioactivity.

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“…were determined, which represented the first case of 2p radioactivity in sd shell nuclei [5]. In a recent work [10], the half-life of 2p decay of 19 Mg g.s. was measured by another experimental technique, the extracted half-life value is consistent with the first measurements.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of excited states of unbound nuclei Ar30 and Cl29

Xu¹,

Mukha²,

Grigorenko³

et al. 2018

Phys. Rev. C

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appear in the even-proton number (Z) isotopes beyond the proton drip-line, in which one-proton (1p) emission is energetically prohibited but the ejection of two protons is energetically allowed due to the pairing interaction. More than 40 years after its prediction, ground-state 2p radioactivity was discovered in 2002 [2,3]. Two experiments independently observed that the ground state (g.s.) of 45 Fe decays by simultaneous emission of two protons. Later 54 Zn [4], 19 Mg [5], 48 Ni [6], and 67 Kr [7] were found to be other g.s. 2p radioactive nuclei. Among the g.s. 2p emitters hitherto observed, the halflives of 45 Fe, 48 Ni, and 54 Zn are in the range of several ms,

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Mg19two-proton decay lifetime

Abstract: The ground state two-proton decay lifetime of 19

Cited by 13 publications

References 36 publications

Observation and Spectroscopy of New Proton-Unbound IsotopesAr30andCl2

Observation and Spectroscopy of New Proton-Unbound IsotopesAr30andCl2

Study of Two-Neutron Radioactivity in the Decay ofO26

Spectroscopy of excited states of unbound nuclei Ar30 and Cl29

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