4π Neutron detection with low-intensity radioactive beams

Zoppo, A. Del; Figuera, P.; Musumarra, A.; Colonna, N.; Alba, R.; Bonomo, C.; Cherubini, S.; Coséntino, L.; Pietro, A. Di; Gulino, M.; Cognata, M. La; Lamia, L.; Pizzone, R. G.; Rolfs, C.; Romano, S.; Spitaleri, C.; Tudisco, S.; Туміно, А.

doi:10.1016/j.nima.2007.08.069

Cited by 10 publications

(9 citation statements)

References 36 publications

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“…The values of the parameters τ fast = 69 ± 0.4µs, τ slow = 160 ± 0.7µs and q = 0.58 ± 0.003 [18,23] are independent of the neutron energy in the 0.1÷ 20 MeV range. The linear relation 1…”

Section: Experiments Strategymentioning

confidence: 88%

“…7 from the two sources represent a valuable experimental reference for detailed Monte Carlo calculations. These were performed by implementing beam pipe and gas cell in the GEANT 3.21 code used in [18,23]. Fig.…”

Section: The Recommended 8 Li(α N) 11 B Cross Section Valuementioning

confidence: 99%

“…In particular, we report on the improved determination of the cross section at 1.05 ± 0.16 MeV in the c.o.m system, corresponding to T 9 ∼ 2. The experimental strategy is the one successfully adopted in our recent works [13,16,18,23]. This is implemented here with complementary key experimental data and with the original development of the appropriate experimental formalism, to provide a more accurate estimate of the reaction cross section and to further support the reliability of both statistical and systematic uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Cognata¹,

Zoppo²,

Alba³

et al. 2010

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

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Abstract. The8 Li+ 4 He → 11 B+n reaction inside the center of mass energy region E cm = 0.5 − 2.5 MeV, corresponding to the temperature range T 9 = 1 − 5, is of relevant interest in the fields of nuclear cosmology and nuclear astrophysics. In the context of Big-Bang nucleosynthesis, it has been invoked to overcome the A=8 mass gap; in r-process nucleosynthesis, it is considered a candidate precursor of seed nuclei. In this experimental work, the cross section, summed over all 11 B final bound states, at the energy of 1.05 MeV in the center-of-mass system, is investigated by a correction-free projectile-correlated inclusive neutron measurement. The radioactive 8 Li beam delivered by the EXCYT facility at LNS-Catania is used to induce the inversekinematics reaction process. A zero-energy-threshold 4π detection system is used. Thanks to the improved experimental and analysis procedures, the result obtained in this work represents a strong argument to reopen the debate on the magnitude of the 8 Li(α, n) 11 B reaction rate in explosive astrophysical environments.PACS numbers: 25.60. -t,26.30.-k,26.35.+c

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Section: Experiments Strategymentioning

confidence: 88%

Section: The Recommended 8 Li(α N) 11 B Cross Section Valuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Cognata¹,

Zoppo²,

Alba³

et al. 2010

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

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“…The state-of-the-art fast neutron detector concept for nuclear physics studies is based on the 3 He-filled proportional counters ( 3 He tubes) embedded in a moderator. Several detection systems were constructed over the past years: see, e.g., [6][7][8]. Currently the most sensitive fast neutron detector has been build in the frame of the BRIKEN collaboration [9] with more than 70% average 2022 JINST 17 P02016 detection efficiency in the energy range from 10 −4 to 5 MeV.…”

Section: Introductionmentioning

confidence: 99%

Concept of a fast neutron detector based on ¹⁰B-RPCs

et al. 2022

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We propose an alternative approach for the detection of fast neutrons in the energy range from 10-4 to 5 MeV based on 10B-RPCs (hybrid double-gap Resistive Plate Chambers with 10B4C neutron converters) surrounded by a polyethylene moderator. The detection efficiency as a function of the neutron energy is obtained in Monte Carlo simulations performed with the Geant4 toolkit for several detector configurations. The thickness of the neutron converter is optimized for the maximum efficiency. The results show that for this type of detector it is possible to obtain an average detection efficiency larger than 50% with a weak dependence on the neutron energy. The dark count rate and gamma sensitivity are also discussed.

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“…A detailed discussion on the 8 Li + α cross section measurement and on the discrepancy between the different data sets can be found in Refs. [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Understanding the fusion cross section among light nuclei around the Coulomb barrier

Zoppo

Cognata

2017

EPJ Web Conf.

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In this work we investigate fusion induced by a radioactive 8 Li projectile on a 4 He gas target, at center-of-mass energies between 0.6 and 5 MeV. The main result is the tendency of the dimensionless fusion cross section σ πλ 2 to form well visible plateaus alternated to steep rises. This is likely to be the most genuine consequence of the discrete nature of the intervening angular momenta observed so far in fusion reactions right above the Coulomb barrier. A partial-wave analysis, exclusively based on a pure quantal penetration fusion model, identifies a remarkably low-height barrier. Indeed, these plateaus allow enhanced experimental sensitivity to the fusion barrier given that the most barrier-sensitive lowest partial waves are well separated. We expect that the present results for 8 Li+ 4 He will promote further investigations of the fusion reaction mechanism between very light ions at energies much below the interaction barrier. For the moment, we believe that understanding the plateau origin in the cross section above the barrier will almost certainly be useful to corroborate the extrapolation to the important astrophysical region below the Coulomb barrier, not only in the case of the 8 Li+ 4 He fusion but also for other systems, such as the 12 C+ 12 C.

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4π Neutron detection with low-intensity radioactive beams

Cited by 10 publications

References 36 publications

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Concept of a fast neutron detector based on ¹⁰B-RPCs

Understanding the fusion cross section among light nuclei around the Coulomb barrier

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4π Neutron detection with low-intensity radioactive beams

Cited by 10 publications

References 36 publications

Toward correction-free8Li(α,n)11B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free8Li(α,n)11B data at the Gamow energy of explosive nucleosynthesis

Concept of a fast neutron detector based on 10B-RPCs

Understanding the fusion cross section among light nuclei around the Coulomb barrier

Contact Info

Product

Resources

About

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Concept of a fast neutron detector based on ¹⁰B-RPCs