S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate

D. W. Bardayan; J. C. Blackmon; R. P. Fitzgerald; W. R. Hix; K. L. Jones; R. L. Kozub; J. F. Liang; R. J. Livesay; Z. Ma; L. F. Roberts; M. S. Smith; J. S. Thomas; D. W. Visser

doi:10.1103/PhysRevC.76.045803

S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate

D. W. Bardayan, J. C. Blackmon, R. P. Fitzgerald, W. R. Hix, K. L. Jones, R. L. Kozub, J. F. Liang, R. J. Livesay, Z. Ma, L. F. Roberts, M. S. Smith, J. S. Thomas, D. W. Visser

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Abstract

The P29(p,γ)S30 reaction rate affects the interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the S30 proton threshold at 4399 keV. To better understand the P29(p,γ)S30 rate, we have studied the S30 nucleus with the S32(p,t)S30 reaction. We have observed 13 S30 levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3+ resonance. We also resolve a significant discrepancy between previously published excitation energies. From the observed triton angular distributions, we constrain the spins of several levels, ruling out several previous hypotheses and constraining some for the first time. Using our updated information, we estimate the P29(p,γ)S30 reaction rate is approximately six times larger at nova temperatures than previously thought.

Original language	English
Article number	045803
Journal	Physical Review C - Nuclear Physics
Volume	76
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.76.045803
State	Published - Oct 25 2007

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Bardayan, D. W., Blackmon, J. C., Fitzgerald, R. P., Hix, W. R., Jones, K. L., Kozub, R. L., Liang, J. F., Livesay, R. J., Ma, Z., Roberts, L. F., Smith, M. S., Thomas, J. S., & Visser, D. W. (2007). S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate. Physical Review C - Nuclear Physics, 76(4), Article 045803. https://doi.org/10.1103/PhysRevC.76.045803

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title = "S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate",

abstract = "The P29(p,γ)S30 reaction rate affects the interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the S30 proton threshold at 4399 keV. To better understand the P29(p,γ)S30 rate, we have studied the S30 nucleus with the S32(p,t)S30 reaction. We have observed 13 S30 levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3+ resonance. We also resolve a significant discrepancy between previously published excitation energies. From the observed triton angular distributions, we constrain the spins of several levels, ruling out several previous hypotheses and constraining some for the first time. Using our updated information, we estimate the P29(p,γ)S30 reaction rate is approximately six times larger at nova temperatures than previously thought.",

author = "Bardayan, {D. W.} and Blackmon, {J. C.} and Fitzgerald, {R. P.} and Hix, {W. R.} and Jones, {K. L.} and Kozub, {R. L.} and Liang, {J. F.} and Livesay, {R. J.} and Z. Ma and Roberts, {L. F.} and Smith, {M. S.} and Thomas, {J. S.} and Visser, {D. W.}",

year = "2007",

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day = "25",

doi = "10.1103/PhysRevC.76.045803",

language = "English",

volume = "76",

journal = "Physical Review C - Nuclear Physics",

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T1 - S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate

AU - Bardayan, D. W.

AU - Blackmon, J. C.

AU - Fitzgerald, R. P.

AU - Hix, W. R.

AU - Jones, K. L.

AU - Kozub, R. L.

AU - Liang, J. F.

AU - Livesay, R. J.

AU - Ma, Z.

AU - Roberts, L. F.

AU - Smith, M. S.

AU - Thomas, J. S.

AU - Visser, D. W.

PY - 2007/10/25

Y1 - 2007/10/25

N2 - The P29(p,γ)S30 reaction rate affects the interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the S30 proton threshold at 4399 keV. To better understand the P29(p,γ)S30 rate, we have studied the S30 nucleus with the S32(p,t)S30 reaction. We have observed 13 S30 levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3+ resonance. We also resolve a significant discrepancy between previously published excitation energies. From the observed triton angular distributions, we constrain the spins of several levels, ruling out several previous hypotheses and constraining some for the first time. Using our updated information, we estimate the P29(p,γ)S30 reaction rate is approximately six times larger at nova temperatures than previously thought.

AB - The P29(p,γ)S30 reaction rate affects the interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the S30 proton threshold at 4399 keV. To better understand the P29(p,γ)S30 rate, we have studied the S30 nucleus with the S32(p,t)S30 reaction. We have observed 13 S30 levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3+ resonance. We also resolve a significant discrepancy between previously published excitation energies. From the observed triton angular distributions, we constrain the spins of several levels, ruling out several previous hypotheses and constraining some for the first time. Using our updated information, we estimate the P29(p,γ)S30 reaction rate is approximately six times larger at nova temperatures than previously thought.

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DO - 10.1103/PhysRevC.76.045803

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VL - 76

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

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M1 - 045803

ER -

S30 studied with the S32(p,t)S30 reaction and the P29(p,γ)S30 reaction rate

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