A theoretical model for the cross section of the proton-boron fusion nuclear reaction

Geser, Federico Alejandro; Valente, M.

doi:10.1016/j.radphyschem.2019.03.028

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…It shall be mentioned, however, that BU did not aim at measuring absolute cross sections per se, rather at studying the (p,α) reaction mechanism on light nuclei and at moderate proton energies. Nevertheless, the BU 11 B(p,α 1 ) cross section is in good agreement with the recent calculation of Geser and Valente [24] up to E ≃ 10 MeV, which strengthens the reliability of the BU dataset.…”

Section: Reliability Of Datasetssupporting

confidence: 87%

“…The p-11 B fusion reaction can take place via either resonance states in the 12 C compound nucleus or a direct (p,α) process [1]. In the range of energies considered in this work, the reaction proceeds predominantly through the first excited state of 8 Be (followed by the decay of 8 Be * into 2 α-particles; α 1 channel), while the channel through the ground state of 8 Be (α 0 ) is less probable [23,24]. The direct breakup into 3 α's of the 12 C resonances is also possible, though with small probability.…”

Section: Astrophysical Factor and Cross Sectionmentioning

confidence: 93%

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Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Tentori

Belloni

2023

Nucl. Fusion

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Proton-boron fusion is experiencing a renewed interest as a possible energy source. The reaction is aneutronic and does not involve radioactive species. It has recently been induced by means of high-power lasers. Ignition of H-11B fuel, however, remains challenging because of the low reactivity and high radiative losses of the plasma at temperatures attainable in present-day fusion devices. Ideal ignition has been demonstrated only lately (and marginally), thanks to revisited cross section data. Reliable, agreed and fit-for-use cross section and reactivity data remain indispensable for further progress in the field. We propose a reference p-11B fusion cross section up to 10 MeV, mostly on the basis of recent measurements. We have developed an analytic approximation for the cross section and, through that, calculated the thermal reactivity. We also provide an analytic approximation for the reactivity, in the temperature range 10–500 keV, which is intended to update that of Nevins and Swain (2000 Nucl. Fusion 40 865), generally taken as a reference. Above 30 keV, our reactivity is substantially higher than that of Nevins and Swain. The gap increases with temperature, reaching e.g. 12% at 100 keV and 50% at 500 keV. Considering also the suprathermal contribution elicited by the fusion-born α’s, we anticipate a potential 50% increase already at 300 keV. Such a higher reactivity is expected to appreciably relax the ideal ignition temperature of H-11B fuel.

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Section: Reliability Of Datasetssupporting

confidence: 87%

Section: Astrophysical Factor and Cross Sectionmentioning

confidence: 93%

Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Tentori

Belloni

2023

Nucl. Fusion

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“…The advantage of the p- 11 B reaction compared with deuterium and 3 He fuel is its abundance on the earth [24]. The theoretical studies of p- 11 B have been conducted [25,26] in laser-produced plasmas [27] as well as using so-called beam-target fusion by utilizing solid targets and high-energy beams [28,29].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of aneutronic p-¹¹B reaction in a magnetic confinement device

Ogawa,

Magee,

Tajima

et al. 2024

Nucl. Fusion

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Aneutronic fusion using commonly available fuel such as hydrogen and boron 11 (11B) is one of the most attractive potential energy sources. On the other hand, it requires 30 times higher temperature than deuterium-tritium fusion in a thermonuclear fusion reactor condition. Development of techniques to realize its potential for the experimental capability to produce proton-boron 11 (p-11B) fusion in the magnetically confined fusion device using neutral beam injection is desired. Here we report clear experimental exploration and measurements of p-11B fusion reactions supported by intense hydrogen beams and impurity powder dropper installed in the magnetic confinement plasma Large Helical Device. We measured a significant amount of fusion alpha particle emission using a custom designed alpha particle detector based on a passivated implanted planar silicon detector. Intense negative-ion-based hydrogen beam injectors created a large population of up to 160 keV energetic protons to react with the boron-injected plasma. The p-11B alpha particles having MeV energy were measured with the alpha particle detector which gave a fusion rate in a good agreement with the global p-11B alpha emission rate calculated based on classical confinement of energetic proton, using experimentally obtained plasma parameters.

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“…Proton–boron fusion has been studied theoretically 8 , 9 , in laser produced plasmas 10 , and in particle accelerators through “beam-target fusion” 3 , 11 , but there has not been, until now, the opportunity to study it in a magnetically confined fusion plasma. In beam-target fusion, a particle beam is impingent on a solid target and the interactions between the beam and target particles are limited to binary collisions and short-range interactions.…”

Section: Introductionmentioning

confidence: 99%

First measurements of p11B fusion in a magnetically confined plasma

et al. 2023

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Proton-boron (p11B) fusion is an attractive potential energy source but technically challenging to implement. Developing techniques to realize its potential requires first developing the experimental capability to produce p11B fusion in the magnetically-confined, thermonuclear plasma environment. Here we report clear experimental measurements supported by simulation of p11B fusion with high-energy neutral beams and boron powder injection in a high-temperature fusion plasma (the Large Helical Device) that have resulted in diagnostically significant levels of alpha particle emission. The injection of boron powder into the plasma edge results in boron accumulation in the core. Three 2 MW, 160 kV hydrogen neutral beam injectors create a large population of well-confined, high -energy protons to react with the boron plasma. The fusion products, MeV alpha particles, are measured with a custom designed particle detector which gives a fusion rate in very good relative agreement with calculations of the global rate. This is the first such realization of p11B fusion in a magnetically confined plasma.

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A theoretical model for the cross section of the proton-boron fusion nuclear reaction

Cited by 10 publications

References 10 publications

Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Demonstration of aneutronic p-¹¹B reaction in a magnetic confinement device

First measurements of p11B fusion in a magnetically confined plasma

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A theoretical model for the cross section of the proton-boron fusion nuclear reaction

Cited by 10 publications

References 10 publications

Revisiting p-11B fusion cross section and reactivity, and their analytic approximations

Revisiting p-11B fusion cross section and reactivity, and their analytic approximations

Demonstration of aneutronic p-11B reaction in a magnetic confinement device

First measurements of p11B fusion in a magnetically confined plasma

Contact Info

Product

Resources

About

Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Revisiting p-¹¹B fusion cross section and reactivity, and their analytic approximations

Demonstration of aneutronic p-¹¹B reaction in a magnetic confinement device