Experimental Study of Nuclear Astrophysics with Photon Beams

Shima, T.; Nagai, Y.; Miyamoto, Shuji; Amano, Sho; Horikawa, Ken; Mochizuki, Takayasu; Utsunomiya, H.; Akimune, H.

doi:10.1063/1.3442615

Cited by 7 publications

(5 citation statements)

References 20 publications

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“…They have been obtained with a quasi-monoenergetic photon beam and a time projection chamber, where a simultaneous measurement of both the 4 He(γ, n) 3 He and 4 He(γ, p) 3 H reactions has been performed. The data in the energy range below 30 MeV, where the large disagreement exist, have been remeasured by the same group, confirming their findings [257]. The latter are, however, in disagreement with previous data from Nilsson et al on the neutron channel [252] (for the total cross section we show them below the three-body disintegration threshold, where σ γ 2σ (γ, n)) and with data from Nakayama et al [251], measured via the 4 He( 7 Li, 7 Be) reaction.…”

Section: Photoabsorption Reactionssupporting

confidence: 74%

Electromagnetic reactions on light nuclei

Bacca

Pastore

2014

J. Phys. G: Nucl. Part. Phys.

127

171

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Abstract. Electromagnetic reactions on light nuclei are fundamental to advance our understanding of nuclear structure and dynamics.The perturbative nature of the electromagnetic probes allows to clearly connect measured cross sections with the calculated structure properties of nuclear targets. We present an overview on recent theoretical abinitio calculations of electron-scattering and photonuclear reactions involving light nuclei. We encompass both the conventional approach and the novel theoretical framework provided by chiral effective field theories. Because both strong and electromagnetic interactions are involved in the processes under study, comparison with available experimental data provides stringent constraints on both many-body nuclear Hamiltonians and electromagnetic currents. We discuss what we have learned from studies on electromagnetic observables of light nuclei, starting from the deuteron and reaching up to nuclear systems with mass number A = 16.

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Section: Photoabsorption Reactionssupporting

confidence: 74%

Electromagnetic reactions on light nuclei

Bacca

Pastore

2014

J. Phys. G: Nucl. Part. Phys.

127

171

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“…However, the larger 4 He(γ, p) and 4 He(γ, n) cross sections were found to increase with energy up to 29.8 MeV, giving a GDR shape and position in strong disagreement with numerous previous measurements. The same 4 He photo-disintegration cross sections were later measured again in 2010 by the same group at AIST [57], which confirmed their earlier findings.…”

Section: Previous Photon-induced Measurements With Active-gas Targetssupporting

confidence: 85%

Photonuclear reactions with charged particles detection for nuclear astrophysics studies

et al. 2023

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Measurements of (γ, p) and (γ, α) photonuclear reaction cross sections are relevant for several nucleosynthesis scenarios, from the primordial Big Bang, to stellar burning, and the p-process. Studies of photonuclear reaction cross sections marked a steady development in the last 20 years with the advent of mono-energetic γ-ray beam facilities and improved detection methods. Charged-particle detection from photon-induced reactions in solid targets is mainly achieved with silicon-strip detectors, while time projection chambers were developed for measurements with active gas targets. This review tracks the evolution of charged-particle detection methods and highlights recent 7 Li(γ, t) 4 He and 16 O(γ, α) 12 C cross section measurements using mono-energetic γ-ray beams.

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“…The inclusive cross-section measurement from the 4 He ( 7 Li, 7 Be) reaction also shows a radical departure from the results of the AIST group. Deepening the mystery, the 4 He photo-disintegration cross section was measured again by the same group at AIST, confirming their earlier findings [31]. To clarify the situa-tion, the total (i.e.…”

Section: Introductionsupporting

confidence: 75%

Photo-disintegration of He4 on the cosmic microwave background is less severe than earlier thought

2018

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We thoroughly study the photo-disintegration of 4 He on the cosmic microwave background using the most recent cross-section data both from the inclusive measurement observing the analog of the giant dipole resonance in 4 He through the charge-exchange spin-flip 4 He ( 7 Li, 7 Be) reaction and from measurements of exclusive two-body and three-body processes: 4 He (γ, p) 3 H, 4 He (γ, n) 3 He, and 4 He (γ, pn) 2 H. We show that the present-day (redshift z = 0) mean free path of ultra-relativistic (Lorentz factor ∼ 10 10 ) helium nuclei increases by more that 15% with respect to previous estimates adopted as benchmarks for Monte Carlo simulation codes of ultrahigh-energy cosmic ray propagation. This implies that the physical survival probability of 4 He nuclei would be larger than predicted by existing event generators. For example, for E ∼ 10 10.8 GeV and a propagation distance of 3.5 Mpc, the 4 He intensity would be 35% larger than the output of CRPropa 3 program and 42% larger than the output of SimProp v2r4 program. We provide new parametrizations for the two-body and three-body photodisintegration cross-sections of 4 He, 3 He, tritium, and deuterium.

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Experimental Study of Nuclear Astrophysics with Photon Beams

Cited by 7 publications

References 20 publications

Electromagnetic reactions on light nuclei

Electromagnetic reactions on light nuclei

Photonuclear reactions with charged particles detection for nuclear astrophysics studies

Photo-disintegration of He4 on the cosmic microwave background is less severe than earlier thought

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