Measurement of the β-p emission of [sup 20]Mg and the breakout from the hot CNO cycle

Wallace, Janet; Lotay, G.; Woods, P. J.; Alharbi, A. A.; Banu, A.; David, H. M.; Davinson, T.; McCleskey, M.; Roeder, B. T.; Simmons, E.; Spiridon, A.; Tribble, R. E.; Trache, L.

doi:10.1063/1.3527240

Cited by 3 publications

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“…The spin and parity of this resonance have been the subject of some debate in the past. The present understanding point towards I π = 3 + [7], however, a 1 + assignment is not yet fully ruled out. On the basis of the beta-decay feeding of this resonance, it is possible to set stringent limits on the spin and parity when considering the selection rules for an allowed beta decay.…”

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confidence: 61%

“…It has several energetically allowed decay channels: βγ, βp, βα, βpα and βαp. Only the first two have been observed previously [5][6][7][8]. The present understanding of the decay of 20 Mg is mainly based on Ref.…”

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confidence: 99%

“…The present understanding of the decay of 20 Mg is mainly based on Ref. [5] and [7]. The most recent result on 20 Mg [8] is the accurate and precise determination of the exa e-mail: mvl07@phys.au.dk citation energy of the IAS in 20 Na, 6498.4 (5) keV, which revalidates the Isobaric Multiplet Mass Equation (IMME) for the A = 20 quintet by shifting its excitation energy down by 25 keV.…”

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confidence: 99%

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Beta-delayed proton emission from 20Mg

et al. 2016

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Beta-delayed proton emission from 20 Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station (IDS) setup including both charged-particle and gamma-ray detection capabilities. A total of 26 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in 20 Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State (IAS) in 20 Na is observed. This may allow studies of the 4032.9(2.4) keV resonance in 19 Ne through the beta decay of 20 Mg, which is important for the astrophysically relevant reaction 15 O(α, γ) 19 Ne. Beta-delayed protons were used to obtain a more precise value for the half-life of 20 Mg, 90.9(1.2) ms. PACS. 23.20.Lv γ transitions and level energies-26.30.Ca Explosive burning in accreting binary systems (novae, x-ray bursts)-27.30.+t 20 ≤ A ≤ 38-29.30.Ep Charged-particle spectroscopy

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confidence: 61%

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confidence: 99%

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confidence: 99%

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Beta-delayed proton emission from 20Mg

et al. 2016

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“…This insured that the 27 P and the low-energy protons of interest were fully contained within the proton detector. The technique used in this experiment was similar to experiments done previously at TAMU [17][18][19][20]. The beam from the cyclotron was pulsed by sending electronic signals (beam-on and beam-off requests) to the cyclotron, with the 27 P implanted for 503 ms into the proton detector, the cyclotron was then turned off for a 3 ms wait (to give the cyclotron time to process the beamoff request), then the decay was measured for 500 ms, roughly twice the half-life value 260(80) ms [11].…”

Section: Fig 2 Top View Of the Implantation-decay Station Placed Atmentioning

confidence: 96%

“…The front and back silicon detectors, referred to as the β1 and β2 detectors respectively, aided in the implantation process, discussed below, and were used to detect β particles during the decay measurement. All three of these silicon detectors were cooled with cold flowing water (20 • C) in order to reduce the leakage currents and therefore improve energy resolution.…”

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confidence: 99%

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

McCleskey¹,

Banu²,

McCleskey³

et al. 2016

Phys. Rev. C

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This is the first study of 27 P that measured both the β-delayed proton and β-delayed γ decays. While no new proton groups in the astrophysically interesting energy region of 300 -400 keV were observed, a new upper limit on the proton branching of 0.16% was estimated. Several new γ-ray lines were observed, mainly coming from the isobaric analog state (IAS) in 27 Si, which has been assigned a more accurate energy value of 6638(1) keV.

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The decay characteristic of $^{22}$Si and its ground-state mass significantly affected by three-nucleon forces

Xu,

Lin,

Sun

et al. 2016

Preprint

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The decay of the proton-rich nucleus 22 Si was studied by a silicon array coupled with germanium clover detectors. Nine charged-particle groups are observed and most of them are recognized as β-delayed proton emission. A charged-particle group at 5600 keV is identified experimentally as β-delayed two-proton emission from the isobaric analog state of 22 Al. Another charged-particle emission without any β particle at the low energy less than 300 keV is observed. The half-life of 22 Si is determined as 27.5 ( 18) ms. The experimental results of β-decay of 22 Si are compared and in nice agreement with shell-model calculations. The mass excess of the ground state of 22 Si deduced from the experimental data shows that three-nucleon (3N) forces with repulsive contributions have significant effects on nuclei near the proton drip line.

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Measurement of the β-p emission of [sup 20]Mg and the breakout from the hot CNO cycle

Cited by 3 publications

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Beta-delayed proton emission from 20Mg

Beta-delayed proton emission from 20Mg

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

The decay characteristic of $^{22}$Si and its ground-state mass significantly affected by three-nucleon forces

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