Levels of 31P from α-particle capture in 27Al

Voigt, M.J.A. de; Regenboog, D.A.; Grootenhuis, J.G.; Leun, C. van der

doi:10.1016/0375-9474(71)90733-0

Cited by 22 publications

(42 citation statements)

References 18 publications

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“…[8] and Woosley et al [IO] have also been included The resonances observed in the 27Al(a, n)30P reaction' have been compared with levels in 31P from a-particle capture in 27Al [9]. It is seen that neutron groups at a-particle energies of about 3.07, 3.20, 3.24 and 3.30MeV are excited corresponding to levels in 31P at 12.328, 12.444 and 12.455, 12.479 and 12.497 and 12.547 MeV, respectively.…”

Section: Physica Scripta 33mentioning

confidence: 99%

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser

et al. 2015

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The "Al(a, n)"P reaction has an astrophysical interest in connection with the syntheses of elements in the solar system and in stars during explosive carbon burning. A good knowledge of the energy dependence of the cross section for this reaction is therefore of importance. In the present work the yield from a thick "Al-target was measured for aparticles in the energy range 3.04 to 3.66 MeV corresponding to stellar temperatures between 2.08 and 2.75 X lo9 K. The observed neutron yield curve was used to determine nucleosynthesis reaction rates, NA(uv).

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Section: Physica Scripta 33mentioning

confidence: 99%

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser

et al. 2015

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“…The 30 Si(p,γ) 31 P reaction rate is rather well constrained experimentally at high temperatures (T ≥ 1 GK which are relevant for type Ia supernovae nucleosynthesis [9]) where the strength of resonances above E c.m. r = 600 keV has been measured directly [10].…”

Section: Introductionmentioning

confidence: 96%

“…These works suggest that the polluter material should be produced by hydrogen burning occurring in a temperature range of 120 − 200 MK. However, this temperature range is sensitive to a few proton radiative capture reactions, 30 Si(p,γ) 31 P being one of them.…”

Section: Introductionmentioning

confidence: 99%

“…The proton width of the E c.m. r = 441 keV resonance has been determined indirectly from its proton spectroscopic factor, obtained from the one-proton 30 Si( 3 He,d) 31 P transfer reaction [15]. The proton widths of the other resonances were not determined due to the poor energy resolution not allowing to separate the E x = 7719 − 7737 keV doublet, and the low statistics for the least populated states.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the $^{30}$Si($^{3}$He,$d$)$^{31}$P reaction and thermonuclear reaction rate of $^{30}$Si($p$,$γ$)$^{31}$P

Harrouz,

de Séréville,

Adsley

et al. 2022

Preprint

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Background: Abundance anomalies in some globular clusters, such as the enhancement of potassium and the depletion of magnesium, can be explained in terms of an earlier generation of stars polluting the presently observed ones. It was shown that the potential range of temperatures and densities of the polluting sites depends on the strength of a few number of critical reaction rates. The 30 Si(p,γ) 31 P reaction has been identified as one of these important reactions. Purpose:The key ingredient for evaluating the thermonuclear 30 Si(p,γ) 31 P reaction rate is the strength of the resonances which, at low energy, are proportional to their proton width. Therefore the goal of this work is to determine the proton widths of unbound 31 P states.Method: States in 31 P were studied at the Maier-Leibnitz-Laboratorium using the one-proton 30 Si( 3 He,d) 31 P transfer reaction. Deuterons were detected with the Q3D magnetic spectrometer. Angular distribution and spectroscopic factors were extracted for 27 states, and proton widths and resonance strengths were calculated for the unbound states.Results: Several 31 P unbound states have been observed for the first time in a one-proton transfer reaction. Above 20 MK, the 30 Si(p,γ) 31 P reaction rate is now entirely estimated from the observed properties of 31 P states. The reaction rate uncertainty from all resonances other than the E c.m. r = 149 keV resonance has been reduced down to less than a factor of two above that temperature. The unknown spin and parity of the E c.m. r = 149 keV resonance dominates the uncertainty in the rate in the relevant temperature range. Conclusion:The remaining source of uncertainty on the 30 Si(p,γ) 31 P reaction rate comes from the unknown spin and parity of the E c.m. r = 149 keV resonance which can change the reaction rate by a factor of ten in the temperature range of interest.

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“…This reaction has been formerly used to monitor traces of beryllium in the environment with a source of alpha particles of 5 MeV emitted by a 210 Po source of 0.16 Ci [8]. In the case of a sapphire target, the cray spectrum also shows a 2235 keV line produced by aluminium through the 27 Al(a, pc) 30 Si reaction [9,10] which can conveniently be used as a monitor of the integrated beam charge. However, the energy of the impinging He ions has to be carefully adjusted since in sapphires, due to the poor resolution of the scintillator detector used in the experiment, the 3498 keV c-rays from the decay from the second level of 30 Si in the previous reaction might interfere with the searched 4439 keV c-rays.…”

Section: Introductionmentioning

confidence: 99%

Detection of beryllium treatment of natural sapphires by NRA

Gutiérrez

Ynsa

Climent‐Font

et al. 2010

Nuclear Instruments and Methods in Physics Research Section B:

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Levels of 31P from α-particle capture in 27Al

Cited by 22 publications

References 18 publications

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser

Experimental study of the $^{30}$Si($^{3}$He,$d$)$^{31}$P reaction and thermonuclear reaction rate of $^{30}$Si($p$,$γ$)$^{31}$P

Detection of beryllium treatment of natural sapphires by NRA

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Levels of 31P from α-particle capture in 27Al

Cited by 22 publications

References 18 publications

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO4laser

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO4laser

Experimental study of the $^{30}$Si($^{3}$He,$d$)$^{31}$P reaction and thermonuclear reaction rate of $^{30}$Si($p$,$γ$)$^{31}$P

Detection of beryllium treatment of natural sapphires by NRA

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Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser

Broadband supercontinuum generation in a telecommunication fibre pumped by a nanosecond Tm, Ho:YVO₄laser