Isospin-forbidden resonances in 25Al, 29P and 33Cl, and the systematics of isospin mixing

Ikossi, P.G.; Clegg, T.B.; Jacobs, W. W.; Ludwig, E. J.; Thompson, William J.

doi:10.1016/0375-9474(76)90223-2

Cited by 32 publications

(4 citation statements)

References 55 publications

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“…8. If the IAS is moved down by a few keV, the Γ p for the IAS comes into agreement with the well-measured Γ p value [81][82][83]. This is equivalent to moving the T = 1/2 state up a few keV.…”

Section: G Mirror Asymmetrysupporting

confidence: 68%

“…We extract the ratio of Γ γ /Γ p = 0.019(3) from the I γ and I p values. Combining our Γ γ /Γ p ratio with the literature Γ p value [81][82][83] yields a Γ γ = 2.1(5) eV. We have determined an ωγ = 1.0(4) eV by taking into account the I p0 /I ptot = 0.17 (5), deduced from the intensities of proton emission from the IAS (See Table III).…”

Section: G Mirror Asymmetrymentioning

confidence: 68%

“…The USDC and USDI shell-model calculations estimate the Γ γ to be 2.98 and 2.45 eV, respectively, in agreement with the Γ γ = 2.1(5) eV derived from our Γ γ /Γ p ratio and the Γ p from Refs. [81][82][83]. The shell model also indicates that Γ p of the IAS depends on the mixing with a predicted nearby 5/2 + , T = 1/2 state that has a Γ p of 50 keV.…”

Section: G Mirror Asymmetrymentioning

confidence: 85%

“…I. 25 Al T = 3/2 IAS at 7902 keV The proton partial width of the lowest T = 3/2 IAS in 25 Al was determined to be Γ p = 155(50) eV [81,82] and 105 (18) eV [83], respectively, in two proton scattering measurements with polarized-proton beams. These two results agree, and a weighted average Γ p is deduced to be 111 (17) eV.…”

Section: G Mirror Asymmetrymentioning

confidence: 99%

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β -decay spectroscopy of S27

Sun¹,

Xu²,

Lin³

et al. 2019

Phys. Rev. C

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Background: β-decay spectroscopy provides valuable information on exotic nuclei and a stringent test for nuclear theories beyond the stability line. Purpose: To search for new β-delayed protons and γ rays of 25 Si to investigate the properties of 25 Al excited states. Method: 25 Si β decays were measured by using the Gaseous Detector with Germanium Tagging system at the National Superconducting Cyclotron Laboratory. The protons and γ rays emitted in the decay were detected simultaneously. A Monte Carlo method was used to model the Doppler broadening of 24 Mg γ-ray lines caused by nuclear recoil from proton emission. Shell-model calculations using two newly-developed sd-shell Hamiltonians, USDC and USDI, were performed. Results: The most precise 25 Si half-life to date has been determined. A new proton branch at 724(4) keV and new proton-γ-ray coincidences have been identified. Three 24 Mg γ-ray lines and eight 25 Al γ-ray lines are observed for the first time in 25 Si decay. The first measurement of the 25 Si β-delayed γ ray intensities through the 25 Al unbound states is reported. All the bound states of 25 Al are observed to be populated in the β decay of 25 Si. Several inconsistencies between the previous measurements have been resolved, and new information on the 25 Al level scheme is provided. An enhanced decay scheme has been constructed and compared to the mirror decay of 25 Na and the shell-model calculations. Conclusions: The measured excitation energies, γ-ray and proton branchings, log f t values, and Gamow-Teller transition strengths for the states of 25 Al populated in the β decay of 25 Si are in good agreement with the shell model calculations, offering gratifyingly consistent insights into the fine nuclear structure of 25 Al.

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Section: G Mirror Asymmetrysupporting

confidence: 68%