The electron screening puzzle and nuclear clustering

Spitaleri, C.; Bertulani, C. A.; Fortunato, L.; Vitturi, A.

doi:10.1016/j.physletb.2016.02.019

Cited by 44 publications

(34 citation statements)

References 20 publications

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“…A recent work that was initially proposed by C.A.Bertulani and C.Spitaleri and finished with the contribution of the Padova group [166] treats the problem of fusion at astrophysical energies for light clusterized nuclei. At the temperatures at which fusion occurs in stars, the fusion rate is enhanced by the presence of a gas of electrons in the stellar plasma, that shows significant deviations with respect to the fusion cross-section measured in laboratory experiments, leading to the necessity to include an effective screening potential.…”

Section: Fusion At Astrophysical Energies In Light Clusterized Systemsmentioning

confidence: 99%

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An overview of the scientific contribution of Andrea Vitturi to nuclear physics

et al. 2020

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We give an account of the main achievements of the scientific career of Andrea Vitturi so far, that have recently been discussed during the workshop "Theoretical Nuclear Physics in Padova" on the occasion of his retirement from full professor at the University of Padova. He has oftentimes been the driving force behind numerous contributions to nuclear structure and nuclear reactions that are here reviewed: giant resonances, pairing correlations, collective modes, algebraic models, inelastic excitations, electromagnetic response, break-up and transfer reactions, coupled-channel formalism, clustering, subbarrier fusion processes, etc. Among these topics several inspirational works and ideas can be found that we would like to highlight. PACS. PACS-key discribing text of that key -PACS-key discribing text of that keyThis manuscript serves two scopes. On one hand, it is an account of some of the topics discussed in the recent workshop "Theoretical Nuclear Physics in Padova: a meeting in honor of Prof. Andrea Vitturi"[1] that was held in Padova on May 20 and 21 2019 on occasion of his retirement. On the other, the organizers and participants felt the duty to summarize in this review paper his extensive scientific production, beyond what was discussed at the meeting, because it spans a broad range of topics in low energy nuclear physics, trying to highlight several fruitful ideas and to shed new light on some less known papers that most certainly deserve further recognition.

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Section: Fusion At Astrophysical Energies In Light Clusterized Systemsmentioning

confidence: 99%

“…In Ref. [166], the reason for the anomalous values of the effective screening potential was attributed to nuclear clustering phenomena, that might severely affect the fusion cross-sections in reactions involving light nuclei. In a WKB approach, the tunneling probability can be calculated as…”

Section: Fusion At Astrophysical Energies In Light Clusterized Systemsmentioning

confidence: 99%

An overview of the scientific contribution of Andrea Vitturi to nuclear physics

et al. 2020

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“…Recently it was suggested that the reason for the large screening potential values is in fact due to clusterization effects in nuclear reactions, in particular for reaction involving light nuclei [12]. Experiments at ELI-NP will shed light on this issue.…”

Section: Nuclear Physics In Astrophysics Research At the Eli-np Hplsmentioning

confidence: 99%

Nuclear physics and astrophysics experiments at ELI-NP: The emerging future

Balabanski

2017

EPJ Web Conf.

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Abstract. The status of implementation of the ELI-NP high-power laser system and the high-brilliance gamma beam system is reported. The emerging experimental program at the facility in nuclear physics in astrophysics is discussed, with emphasis of the considered day-one experiments. The ELI-NP FacilityThe main research tools at Extreme Light Infrastructure Nuclear Physics (ELI-NP) facility are a high-power laser system (HPLS) and a high-brilliance gamma-beam system (GBS) [1]. They are superior to what is available at present in research laboratories worldwide. The mission of the facility, which will become operational in 2019 as an open access user facility, is cutting-edge research in the field of nuclear photonics. The HPLS has central wavelength of 815 nm, reaching 10 PW peak power in pulses of duration below 22 fs, with a contrast of 10 13 :1 at 100 ps and 10 9 :1 at 10 ps ahead of the pulse peak. It has two laser arms, operated by a common front-end. Each laser arm has three optical compressors, at 10 PW, 1 PW and 100 TW. The 10 PW outputs can provide pulses once per minute, the 1 PW outputs operate at 1 Hz and the 100 TW outputs -at 10 Hz. The two arms will be synchronized and experiments with any combination of pulses will be possible [2,3]. The HPLS system and the support target laboratory are placed in clean room areas.The ELI-NP GBS will provide beams in the range between 200 keV and 19.5 MeV with a bandwidth better than 0.5%, spectral density of about 10 4 photons/(eV·s) and linear polarization higher than 95%. The gamma beam will be produced by inverse Compton scattering of 515 nm green laser light, provided by 100 Hz Yb:YAG lasers, off electron beams accelerated to relativistic energies by a warm linac consisting of S-band photoinjector and C-band acceleration cavities [4]. The electrons will interact with the laser beams at two interaction points, at low and high electron beam energies, producing low (200 keV to 3.5 MeV) and high energy (3 MeV to 19.5 MeV) gamma beams. The gamma beams will be delivered along two beam lines, placed after each interaction point. The electron beam will be bunched with a frequency of 100 Hz, and each bunch will consist of a train of 32 microbunches. Laser re-circulators will be used at the interaction points to

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“…Often extrapolations from high energy data down to Gamow energies are used, although they could suffer of uncertainties related, for instance, to the presence of unknown low-lying (or even subthreshold) resonances or to the electron screening phenomenon [1,2]. This effect, due to the electron (atomic) cloud surrounding the positively charged nucleus, alters the cross-section at low-energies, thus partially shielding the pure Coulomb repulsion between the charged-interacting nuclei.…”

Section: Introductionmentioning

confidence: 99%

The Trojan Horse Method for nuclear astrophysics and its recent applications

et al. 2017

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Abstract. The Trojan Horse Method (THM) has been applied extensively for the last 25 years to measure nuclear reaction cross sections of interest for astrophysics. Although it has been mainly applied for charged particle-induced reactions, recently it has been found to have also a relevant role for neutron-induced reactions. Here, some advantages of THM will be discussed and the preliminary results of the cosmological relevant 7 Be(n,α) 4 He cross section measurement are discussed.

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The electron screening puzzle and nuclear clustering

Cited by 44 publications

References 20 publications

An overview of the scientific contribution of Andrea Vitturi to nuclear physics

An overview of the scientific contribution of Andrea Vitturi to nuclear physics

Nuclear physics and astrophysics experiments at ELI-NP: The emerging future

The Trojan Horse Method for nuclear astrophysics and its recent applications

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