Experimental measurement of 
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 fusion at stellar energies

Fang, X.; Tan, Wanpeng; Beard, M.; deBoer, R. J.; Gilardy, G.; Jung, H. S.; Liu, Q.; Lyons, S.; Robertson, Daniel; Setoodehnia, Kiana; Seymour, C.; Stech, E.; Kolk, B. Vande; Wiescher, M.; deSouza, Romualdo; Hudan, S.; Singh, Varinderjit; Tang, Xiaodong; Uberseder, E.

doi:10.1103/physrevc.96.045804

Cited by 37 publications

(43 citation statements)

References 44 publications

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“…Very recently, the fusion cross sections of 12 C + 16 O have been measured [12] at very low energies (down to ≃1 nb), where a decreasing trend of the S factor has been evidenced. These new data may be an indication that the hindrance phenomenon is present in such a light system.…”

Section: Introductionmentioning

confidence: 99%

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Fusion hindrance for the positive Q -value system C12+Si30

Montagnoli¹,

Stefanini²,

Jiang³

et al. 2018

Phys. Rev. C

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Background: The fusion reaction 12 C + 30 Si is a link between heavier cases studied in recent years, and the light heavy-ion systems e.g. 12 C + 12 C, 16 O + 16 O that have a prominent role in the dynamics of stellar evolution. 12 C + 30 Si fusion itself is not a relevant process for astrophysics, but it is important to establish its behaviour below the barrier, where couplings to low-lying collective modes and the hindrance phenomenon may determine the cross sections. The excitation function is presently completely unknown below the barrier for the 12 C + 30 Si reaction, thus no reliable extrapolation into the astrophysical regime for the C+C and O+O cases, can be performed.Purpose: Our aim was to carry out a complete measurement of the fusion excitation function of 12 C + 30 Si from well below to above the Coulomb barrier, so as to clear up the consequence of couplings to low-lying states of 30 Si, and whether the hindrance effect appears in this relatively light system which has a positive Q-value for fusion. This would have consequences for the extrapolated behaviour to even lighter systems.Methods: The inverse kinematics was used by sending 30 Si beams delivered from the XTU Tandem accelerator of INFN-Laboratori Nazionali di Legnaro onto thin 12 C (50µg/cm 2 ) targets enriched to 99.9% in mass 12. The fusion evaporation residues (ER) were detected at very forward angles, following beam separation by means of an electrostatic deflector. Angular distributions of ER were measured at E beam = 45, 59 and 80 MeV, and they were angle-integrated to derive total fusion cross sections. Results:The fusion excitation function of 12 C + 30 Si has been measured with high statistical accuracy, covering more than five orders of magnitude down to a lowest cross section ≃3µb. The logarithmic slope and the S factor have been extracted and we have a convincing phenomenological evidence of the hindrance effect. These results have been compared with the calculations performed within the model that considers a damping of the coupling strength well inside the Coulomb barrier. Conclusions:The experimental data are consistent with the coupled-channels calculations. A better fit is obtained by using the Yukawa-plus-exponential potential and a damping of the coupling strengths inside the barrier. The degree of hindrance is much smaller than the one in heavier systems. Also a phenomenological estimate reproduces quite closely the hindrance threshold for 12 C + 30 Si, so that an extrapolation to the C+C and O+O cases can be reliably performed.

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Section: Introductionmentioning

confidence: 99%

“…In Ref. [12] it is also pointed out that the 12 C + 16 O reaction plays anyway a minor role in late stellar evolution, compared to e.g. 12 C + 12 C fusion.…”

Section: Introductionmentioning

confidence: 99%

Fusion hindrance for the positive Q -value system C12+Si30

Montagnoli¹,

Stefanini²,

Jiang³

et al. 2018

Phys. Rev. C

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“…Two wedge shape silicon strip detectors cover the angles from 113.5 • to 163.5 • in the lab frame. The kinematic calculation of the 12 C( 12 C,p)23 Na reaction at E lab =8.2 MeV. The energies of protons at different outgoing angles are given.…”

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confidence: 99%

“…IV. OBTAINING THE S * FACTOR OF 12 C( 12 C,p1)23 Na WITH THE THICK TARGET METHOD The measurement utilizing the thick target method was carried out in the energy range 3 MeV<E c.m. < 5.3 MeV (6 MeV<E beam < 10.6 MeV).…”

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confidence: 99%

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An efficient method for mapping the $${}^{12}\hbox {C}+{}^{12}\hbox {C}$$ molecular resonances at low energies

Tang

Fang

et al. 2019

NUCL SCI TECH

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The 12 C+ 12 C fusion reaction is famous for its complication of molecular resonances, and plays an important role in both nuclear structure and astrophysics. It is extremely difficult to measure the cross sections of 12 C+ 12 C fusions at energies of astrophysical relevance due to very low reaction yields. To measure the complicated resonant structure existing in this important reaction, an efficient thick target method has been developed and applied for the first time at energies Ec.m.<5.3 MeV. A scan of the cross sections over a relatively wide range of energies can be carried out using only a single beam energy. The result of measurement at Ec.m.= 4.1 MeV is compared with other results from previous work. This method would be useful for searching potentially existing resonances of 12 C+ 12 C in the energy range 1 MeV

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Nuclear Data Sheets for A=24

Basunia

Chakraborty

2022

Nuclear Data Sheets

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Experimental measurement of C12+O16 fusion at stellar energies

Cited by 37 publications

References 44 publications

Fusion hindrance for the positive Q -value system C12+Si30

Fusion hindrance for the positive Q -value system C12+Si30

An efficient method for mapping the $${}^{12}\hbox {C}+{}^{12}\hbox {C}$$ molecular resonances at low energies

Nuclear Data Sheets for A=24

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