References

doi:10.1002/9783527692668.refs

Cited by 1 publication

(4 citation statements)

References 416 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where µ is the reduced mass of the 30 Si+p system, k the Maxwell-Boltzmann constant, T the temperature, and σ(E) the nuclear reaction cross section at energy E. For the 30 Si(p,γ) 31 P reaction, the resonances of interest are narrow and isolated and the thermonuclear reaction rate becomes [14]:…”

Section: A Methodsmentioning

confidence: 99%

“…For unbound states the proton width Γ p is expressed as the product of the proton spectroscopic factor and the single-particle proton width: Γ p = C 2 S p × Γ s.p . The single-particle width is calculated with the formula [14]: c The protons are assumed to be transferred to 2p 3/2 , 1d 3/2 and 1f 7/2 orbitals for = 1, 2 and 3 transitions, respectively.…”

Section: B Proton Width and Resonance Strengthmentioning

confidence: 99%

“…Once the proton width is calculated the resonance strength ωγ can be evaluated. The resonance strength is defined as [14]:…”

Section: B Proton Width and Resonance Strengthmentioning

confidence: 99%

“…Indirect determination of the proton widths provides an alternative approach to determining the reaction rates. For resonance energies corresponding to T = 120 − 200 MK, the resonance strengths are directly proportional to the proton width since the proton widths are much smaller than the γ-ray widths [14]. The proton width of the E c.m.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: A Methodsmentioning

confidence: 99%

Section: B Proton Width and Resonance Strengthmentioning

confidence: 99%

“…Once the proton width is calculated the resonance strength ωγ can be evaluated. The resonance strength is defined as [14]:…”

Section: B Proton Width and Resonance Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

References

Cited by 1 publication

References 416 publications

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

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

Contact Info

Product

Resources

About