Proton threshold states in 27Si and their implications on hydrogen burning of 26Al

Schmalbrock, Petra; Donoghue, T.R.; Wiescher, M.; Wijekumar, V.; Browne, C.P.; Rollefson, A.A.; Rolfs, C.; Vlieks, A.E.

doi:10.1016/0375-9474(86)90526-9

Cited by 18 publications

(28 citation statements)

References 11 publications

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“…The elements along the approximate 45 degree diagonal represent nuclei that punch through both the β1 and the proton detector. In this case, these nuclei are the beam impurities mentioned earlier, and with the exception of 25 Si and 24 Al, make up only a small fraction of the beam. As they completely pass through the proton detector, they do not interfere with the proton measurement.…”

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

confidence: 79%

“…While this last γ-ray line corresponds energetically to a double escape peak from the 4792.3-keV γ ray, this peak was far more intense than what was expected for an escape peak. These γ rays established an IAS level energy of 6638(1) keV (verses the 6626(3) keV predicted [23,24]). The large difference in IAS energies might be due to the high density of levels and the constant α contamination observed in the previous reaction study using 28 Si( 3 He, α) 27 Si [24].…”

Section: B Gamma Studymentioning

confidence: 82%

“…These γ rays established an IAS level energy of 6638(1) keV (verses the 6626(3) keV predicted [23,24]). The large difference in IAS energies might be due to the high density of levels and the constant α contamination observed in the previous reaction study using 28 Si( 3 He, α) 27 Si [24]. Several new γ transitions were observed coming from the 3/2 + 6559.0-keV level, one from the transition to the 3/2 + 2866.0-keV level and two less intense γ rays from transitions to 5/2 + levels (4284.8 keV and 2647.2 keV).…”

Section: B Gamma Studymentioning

confidence: 82%

“…This was done by using the relative proton yields of 27 P and 28 P as well as their production cross sections, which were calculated using the statistical-model fusion-evaporation code AL-ICE [13]. However, due to the unavoidable presence of 24 Al, a weak βα emitter, there was a background in the form of a continuum between 300 and 1100 keV in their proton spectrum. Thus, it was not possible to obtain a total β-decay strength because low-energy protons could not be unambiguously assigned.…”

Section: Almentioning

confidence: 99%

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

confidence: 79%

Section: B Gamma Studymentioning

confidence: 82%

Section: B Gamma Studymentioning

confidence: 82%

Section: Almentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

McCleskey¹,

Banu²,

McCleskey³

et al. 2016

Phys. Rev. C

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“…They also used the thick-target method to find the strengths of these resonances. Schmalbrock et al (1986) [26] used the 28 Si( 3 He,α) 27 Si reaction to determine the energies of 58 states from Ex = 4.14 -8.37…”

Section: Introductionmentioning

confidence: 99%

Production of26Al in stellar hydrogen-burning environments: Spectroscopic properties of states in27Si

et al. 2011

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Model predictions of the amount of the radioisotope 26 Al produced in hydrogen-burning environments require reliable estimates of the thermonuclear rates for the 26g Al(p,γ) 27 Si and 26m Al(p,γ) 27 Si reactions. These rates depend upon the spectroscopic properties of states in 27 Si within about 1 MeV of the 26g Al+p threshold (Sp = 7463 keV). We have studied the 28 Si( 3 He,α) 27 Si reaction at 25 MeV using a high-resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. For the first time with a transfer reaction, we have constrained J π values for states in 27 Si over Ex = 7.0 -8.1 MeV through angular distribution measurements.Aside from a few important cases, we generally confirm the energies and spin-parity assignments reported in a recent γ-ray spectroscopy study. The magnitudes of neutron spectroscopic factors determined from shell-model calculations are in reasonable agreement with our experimental values extracted using this reaction.

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Nuclear Reactions

Wiescher¹,

Rauscher²

2018

Astrophysics With Radioactive Isotopes

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Proton threshold states in 27Si and their implications on hydrogen burning of 26Al

Cited by 18 publications

References 11 publications

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

Production of26Al in stellar hydrogen-burning environments: Spectroscopic properties of states in27Si

Nuclear Reactions

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