The n_TOF facility at CERN

Tagliente, G.

doi:10.1590/s0103-97332004000500089

Cited by 10 publications

(10 citation statements)

References 1 publication

(1 reference statement)

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“…In summary, results of (n,) measurements have been reported for stable and radioactive samples of interest to the s-process: 24,25,26 Mg [14,15], 54,57 Fe [16], 58,59,62,63 Ni [17][18][19][20], 70,72,73 Ge [21][22][23], 90,91,92,93,94,96 Zr [24,25], 139 La [26], 140 Ce [27], 147 Pm, 151 Sm [28], 154,155,157 Gd [29,30], 171 Tm [31], 186,187,188 Os [32,33], 197 Au [7-10], 203,204 Tl [34], 204,206,207 Pb [35][36][37] and 209 Bi [38] isotopes. In addition, results on 7 Be(n,) and 7 Be(n,p) for the cosmological lithium ...…”

Section: The Nuclear Astrophysical Program At N_tofmentioning

confidence: 99%

“…In some cases, (n,p) and (n,) reactions are also important. In fact, these reactions on a few light elements (for instance, 14 N, 25 Mg, 26 Al) can sizably modify the neutron distribution in the stellar interiors, thus affecting the efficiency of the s-process in synthesizing heavy elements. On the other hand, (n,p) and (n,) reactions are of some relevance in the modelling of Big Bang nucleosynthesis or HNPS Advances in Nuclear Physics vol.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly relevant for the s-process, reported cross sections were used to constrain the Big Bang nucleosynthesis, to benchmark stellar models against nucleosynthesis in quiet and explosive scenarios, to interpret meteoritic abundances, as well as to study the neutron source reactions in Red Giant stars. After a brief description of the n_TOF facility and the related astrophysical program, the research activities about the 13 C(,n) 16 O and 22 Ne(,n) 25 Mg neutron source reactions are discussed.…”

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confidence: 99%

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Nuclear astrophysics at n_TOF: focus on neutron sources in stars

Massimi

2023

HNPS Adv Nucl Phys

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Since 2001, the neutron time-of-flight facility n_TOF at CERN has carried out a large number of cross section measurements of interest for several research fields, including Nuclear Astrophysics. The results of these measurements have improved our knowledge on the nucleosynthesis of chemical elements. Particularly relevant for the s process, reported cross sections were used to constrain the Big Bang nucleosynthesis, to benchmark stellar models against nucleosynthesis in quiet and explosive scenarios, to interpret meteoritic abundances, as well as to study the neutron source reactions in Red Giant stars. After a brief description of the n_TOF facility and the related astrophysical program, the research activities about the 13C(a,n)16O and 22Ne(a,n)25Mg neutron source reactions are discussed.

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Section: The Nuclear Astrophysical Program At N_tofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Nuclear astrophysics at n_TOF: focus on neutron sources in stars

Massimi

2023

HNPS Adv Nucl Phys

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“…Their results differ by a factor of 2, calling for more experimental work. The preliminary result of a new measurement of 26 Al(n, p) 26 Mg performed by the n_TOF collaboration is a promising advance (Tagliente et al 2019). Production of a 26 Al m target is not feasible due to the short lifetime of 26 Al m .…”

Section: Uncertainties In the Relevant Reaction Ratesmentioning

confidence: 99%

The radioactive nuclei and in the Cosmos and in the solar system

Diehl

Lugaro

Heger

et al. 2021

Publ. Astron. Soc. Aust.

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The cosmic evolution of the chemical elements from the Big Bang to the present time is driven by nuclear fusion reactions inside stars and stellar explosions. A cycle of matter recurrently re-processes metal-enriched stellar ejecta into the next generation of stars. The study of cosmic nucleosynthesis and this matter cycle requires the understanding of the physics of nuclear reactions, of the conditions at which the nuclear reactions are activated inside the stars and stellar explosions, of the stellar ejection mechanisms through winds and explosions, and of the transport of the ejecta towards the next cycle, from hot plasma to cold, star-forming gas. Due to the long timescales of stellar evolution, and because of the infrequent occurrence of stellar explosions, observational studies are challenging, as they have biases in time and space as well as different sensitivities related to the various astronomical methods. Here, we describe in detail the astrophysical and nuclear-physical processes involved in creating two radioactive isotopes useful in such studies, $^{26}\mathrm{Al}$ and $^{60}\mathrm{Fe}$ . Due to their radioactive lifetime of the order of a million years, these isotopes are suitable to characterise simultaneously the processes of nuclear fusion reactions and of interstellar transport. We describe and discuss the nuclear reactions involved in the production and destruction of $^{26}\mathrm{Al}$ and $^{60}\mathrm{Fe}$ , the key characteristics of the stellar sites of their nucleosynthesis and their interstellar journey after ejection from the nucleosynthesis sites. This allows us to connect the theoretical astrophysical aspects to the variety of astronomical messengers presented here, from stardust and cosmic-ray composition measurements, through observation of $\gamma$ rays produced by radioactivity, to material deposited in deep-sea ocean crusts and to the inferred composition of the first solids that have formed in the Solar System. We show that considering measurements of the isotopic ratio of $^{26}\mathrm{Al}$ to $^{60}\mathrm{Fe}$ eliminate some of the unknowns when interpreting astronomical results, and discuss the lessons learned from these two isotopes on cosmic chemical evolution. This review paper has emerged from an ISSI-BJ Team project in 2017–2019, bringing together nuclear physicists, astronomers, and astrophysicists in this inter-disciplinary discussion.

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“…High-flux neutron sources can play a key role in the realization of measurements of events of very small cross-sections and/or overcome the limit of very small sample sizes. The CSNS high-power proton beam is well suited to the production of fast neutrons based on the designed WNS, which is similar to the CERN n-TOF facility [12,13]. Using the beam parameters of CSNS-, the main parameters of the CSNS WNS are given in Table 3.…”

Section: The White Neutron Source and Applicationsmentioning

confidence: 99%

Proposal for muon and white neutron sources at CSNS

et al. 2010

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The China Spallation Neutron Source (CSNS) is a large scientific facility with the main purpose of serving multidisciplinary research on material characterization using neutron scattering techniques. The accelerator system is to provide a proton beam of 120 kW with a repetition rate of 25 Hz initially (CSNS-I), progressively upgradeable to 240 kW (CSNS-II) and 500 kW (CSNS-II'). In addition to serving as a driving source for the spallation target, the proton beam can be exploited for serving additional functions both in fundamental and applied research. The expanded scientific application based on pulsed muons and fast neutrons is especially attractive in the overall consideration of CSNS upgrade options. A second target station that houses a muon-generating target and a fast-neutron-generating target in tandem, intercepting and removing a small part of the proton beam for the spallation target, is proposed. The muon and white neutron sources are operated principally in parasitic mode, leaving the main part of the beam directed to the spallation target. However, it is also possible to deliver the proton beam to the second target station in a dedicated mode for some special applications. Within the dual target configuration, the thin muon target placed upstream of the fast-neutron target will consume only about 5% of the beam traversed; the majority of the beam is used for fast-neutron production. A proton beam with a beam power of about 60 kW, an energy of 1.6 GeV and a repetition rate of 12.5 Hz will make the muon source and the white neutron source very attractive to multidisciplinary researchers.

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The n_TOF facility at CERN

Cited by 10 publications

References 1 publication

Nuclear astrophysics at n_TOF: focus on neutron sources in stars

Nuclear astrophysics at n_TOF: focus on neutron sources in stars

The radioactive nuclei and in the Cosmos and in the solar system

Proposal for muon and white neutron sources at CSNS

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