First spin-parity constraint of the 306 keV resonance in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Cl</mml:mi><mml:mprescripts /><mml:none /><mml:mn>35</mml:mn></mml:mmultiscripts></mml:math>
 for nova nucleosynthesis

Chipps, K. A.; Pain, S. D.; Kozub, R. L.; Bardayan, D. W.; Cizewski, J. A.; Chae, K. Y.; Liang, J. F.; Matei, C.; Moazen, B. H.; Nesaraja, C. D.; O’Malley, P. D.; Peters, William A.; Pittman, S. T.; Schmitt, K. T.; Smith, M. S.

doi:10.1103/physrevc.95.045808

Cited by 1 publication

(5 citation statements)

References 26 publications

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“…This is consistent with the result of Ref. [42]. We have therefore, firmly assigned J π = 1/2 + to this level.…”

Section: Resultssupporting

confidence: 93%

“…We have firmly assigned the spin parity of the higher energy state in the doublet at 6677(3) keV as 1/2 + , confirming the assumption made for the first time in Ref. [42] concerning the J π value of this state. In the present work, the strengths of the 288.3-and 306.2-keV resonances, corresponding to the 6659.1-and 6677-keV states, respectively, are treated as upper limits.…”

Section: Discussionsupporting

confidence: 87%

“…This state remained unobserved in our measurement and those of Refs. [41,42]. Moreover, it is near an energy window where a doublet is expected [25], and we have observed both those states at 6662.2 (19) keV and 6677(3) keV.…”

Section: Resultssupporting

confidence: 55%

“…The 6677-keV state: A recent experiment was performed by Chipps et al [42], where they observed via 37 Cl(p,t) a state at 6677 (15) keV. This level was associated with the higher energy state of the previously described doublet at 6656(3)/6681(3) keV observed in Ref.…”

Section: Resultsmentioning

confidence: 73%

“…[25]. Reference [42] have made the first-ever constraint on the spin and parity assignment for the 6677-keV level and have considered it to be most likely of positive parity, with a spin assignment of (1/2, 3/2, 5/2, 7/2). Their best DWBA fit was achieved for the J π = 1/2 + assignment.…”

Section: Resultsmentioning

confidence: 99%

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Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
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Background: The presolar grains originating in oxygen-neon novae may be identified more easily from those of other stellar sources if their sulfur isotopic ratios ( 33 S/ 32 S and 34 S/ 32 S) are compared with the theoretical ones. The accuracy of such a comparison depends on reliable 33 S(p, γ) 34 Cl and 34 S(p, γ) 35 Cl reaction rates at the nova temperature regime. The latter rate has recently been computed based on experimental input, and many new excited states in 35 Cl were discovered above the proton threshold. As a result, the experimental 34 S(p, γ) 35 Cl rate was found to be less uncertain and 2 -5 times smaller than the theoretical one. Consequently, the simulated 34 S/ 32 S isotopic ratio for nova presolar grains was predicted to be smaller than that of type II supernova grains by a factor of 1.5 to 3.7. Purpose: The present study was performed to confirm the existence of these new resonances, and to improve the remaining uncertainties in the 34 S(p, γ) 35 Cl reaction rate. Methods: Energies and spin-parities of the 35 Cl excited levels were investigated via high-resolution charged-particle spectroscopy with an Enge split-pole spectrograph using the 32 S(α, p) 35 Cl reaction. Differential cross sections of the outgoing protons were measured at E α = 21 MeV. Distorted-wave Born approximation calculations were carried out to constrain the spin-parity assignments of observed levels with special attention to those significant in determination of the 34 S(p, γ) 35 Cl reaction rate over the nova temperature regime. Results: The existence of these newly discovered states are largely confirmed, although a few states were not observed in this study. The spins and parities of a few 35 Cl states were assigned tentatively for the first time. Conclusions: The present 34 S(p, γ) 35 Cl experimental thermonuclear reaction rate at 0.1 -0.4 GK is consistent within 1σ with the previous evaluation. However, our rate uncertainty is larger than before due to a more realistic treatment of the uncertainties in the rate input. In comparison with the previous rate evaluation, where the high and low rates differed by less than a factor of 2 over nova temperature regime, the ratio of the present limit rates is at most a factor of 3.5 at 0.12 GK. At temperatures above 0.2 GK, we recommend the future work to focus on determination of the unknown properties of four excited states of 35 Cl 6643 keV, 6761 keV, 6780 keV, and 6800 keV.

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“…This is consistent with the result of Ref. [42]. We have therefore, firmly assigned J π = 1/2 + to this level.…”

Section: Resultssupporting

confidence: 93%

Section: Discussionsupporting

confidence: 87%

Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
View full text Add to dashboard Cite

show abstract

First spin-parity constraint of the 306 keV resonance in Cl35 for nova nucleosynthesis

Cited by 1 publication

References 26 publications

Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
View full text Add to dashboard Cite

Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
View full text Add to dashboard Cite

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First spin-parity constraint of the 306 keV resonance in Cl35 for nova nucleosynthesis

Cited by 1 publication

References 26 publications

Experimental study of Cl35 excited states via S32(α,p)Setoodehnia1, Kelley2, Marshall3 et al. 2019Phys. Rev. C3050View full textAdd to dashboardCite

Experimental study of Cl35 excited states via S32(α,p)Setoodehnia1, Kelley2, Marshall3 et al. 2019Phys. Rev. C3050View full textAdd to dashboardCite

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Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
View full text Add to dashboard Cite

Experimental study of Cl35 excited states via S32(α,p)
Setoodehnia
¹
,
Kelley
²
,
Marshall
³

et al. 2019
Phys. Rev. C
3
0
5
0
View full text Add to dashboard Cite