Tunneling Through Triple-Humped Fission Barriers

Krasznahorkay, A.

doi:10.1007/978-1-4419-0720-2_5

Cited by 17 publications

(12 citation statements)

References 57 publications

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“…Within this approach, a state in the first minimum of the nuclear potential is excited and couples to states in the second or third minima of the potential barrier. This coupling results in resonance states in the fission cross section in the region 5 MeV to 7 MeV [30]. The experiments will aim at the characterization of these transmission resonances through the measurement of angular distributions, and the identification of the fission fragments.…”

Section: Epj Web Of Conferencesmentioning

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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Section: Epj Web Of Conferencesmentioning

confidence: 99%

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

Balabanski

2017

EPJ Web Conf.

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“…This program will address high-resolution photo-fission experiments in the actinides, investigation of the second and third potential minima through studies of transmission resonances [15][16][17], angular and mass distribution measurements of fission fragments, measurements of absolute photo-fission cross-sections, studies of rare photo-fission events, such as ternary fission, highly asymmetric fission, etc. In addition, the possibility to produce exotic neutron-rich nuclei in photo-fission and study their structure and decays is investigated.…”

Section: Photo-fission Studies At the Gbsmentioning

confidence: 99%

“…These include the 12 C(α, γ) 16 O reaction at the Gamow peak (300 keV), which is related to the carbon-to-oxygen ratio at the end of the He burning, one of the key open questions of nuclear astrophysics [20]. Other proposed studies include the 24 Mg(γ, α) 20 Ne reaction, which governs the downward flow from 24 Mg to 4 He.…”

Section: -P4mentioning

confidence: 99%

“…The 19 F(γ,p) 18 O reaction, which is a measure for the loss of catalytic materials from the CNO cycle, providing at the same time a link to the NeNa cycle. The 21 Ne(γ, α) 17 O reaction will allow the determination of the cross section at lower energies of the time-reversal 17 O(α, γ) 21 Ne reaction, which is essential for determining the role of 16 O as a neutron poison in the CNO cycle.…”

Section: -P4mentioning

confidence: 99%

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Towards experiments at the new ELI-NP facility

Balabanski

Cǎta-Danil

Filipescu

et al. 2014

EPJ Web of Conferences

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Abstract. The Extreme Light Infrastructure (ELI) Pan-European initiative represents a major step forward in quest for extreme electromagnetic fields. The Extreme Light Infrastructure -Nuclear Physics (ELI-NP) laboratory is one of the three pillars of the ELI project, that aims to use such extreme electromagnetic fields for nuclear physics and quantum electrodynamics research. At ELI-NP two ten petawatt high-power laser systems together with a very brilliant narrow-width γ beam are the main research tools. Here the current status of the project and the experimental program related to nuclear research, which is under preparation at ELI-NP, are presented. The ELI-NP projectELI-NP [1] is one of the three laboratories under construction, related the ELI project [2], the other two being laser-driven secondary beams in Prague, the Czech Republic [3] and attosecond pulsed lasers in Szeged, Hungary [4]. In 2012 the 293-million-euro ELI-NP project was approved by the European Commission. ELI-NP will host two ultra high-power 10 PW lasers and a gamma beam system (GBS) which will deliver laser and γ-ray beams with parameters beyond those available at the present-stateof-the-art machines. The main laboratory building covers an area of more than 12000 m 2 . Its lay-out is displayed in Fig 1. The high-power laser system (HPLS) and the gamma beam system (GBS) are placed in the laboratory building, adjacent to the corresponding experimental areas. They will be mounted on an anti-vibration slab, damping vibrations to frequencies ≤ 10 Hz with amplitudes down to ±1 μm.The HPLS will have six output lines -two at 10 PW with a frequency of ≥ 1/60 Hz, two at 1 PW with a frequency of ≥ 1 Hz and two at 100 TW with a frequency of ≥ 10 Hz. Each output will have its optical pulse compressor. The duration of the pulses from each of the six outputs of the HPLS shall be tunable from the best compression level to at least 5 ps pulse duration, with both positive and negative chirp. The HPLS outputs will be synchronized with accuracy below 200 fs [5]. The laser system will deliver pulses synchronously with the GBS electron and γ bunches.The GBS is designed and constructed by the European consortium EuroGammaS, led by the Italian INFN LNF, including research and industrial partners from eight European countries. It will produce highly polarized (> 95%) tunable γ beams of spectral density of 10 4 photons/s/eV in the range from 200 keV to 19.5 MeV with a bandwidth of > 0.3% [6,7]. The γ beams will be produced through laser Compton backscattering (LCB) off an accelerated electron beam delivered by a linear a

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“…Even though low-spin hyperdeformation has already proven to be a general feature of the light even-even actinides [3,4], no such systematics has been established for the odd-odd actinides. However, in a recent experiment [5], we found conclusive evidences on the existence of HD bands in an odd-odd nucleus ( 232 Pa) [5], which suggested to start a systematic investigation of the odd-odd actinides.…”

Section: Introductionmentioning

confidence: 99%

Transmission Resonance Spectroscopy of the Doubly Odd $^{238}$Np in ($d$,pf) Reaction

et al. 2015

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The fission probability of 238 Np was measured as a function of the excitation energy in the energy range of E * = 5.4-6.2 MeV in order to search for hyperdeformed rotational bands using the (d,pf) transfer reaction on a radioactive 237 Np target. The experiment was performed at the Tandem accelerator of the Maier-Leibnitz Laboratory at Garching employing the 237 Np(d,pf) reaction at a bombarding energy of E d = 12 MeV. Overlapping resonances have been observed at excitation energies around E * = 5.5 MeV. These resonances could be ordered into a hyperdeformed rotational band by the preliminary analysis of the high-resolution excitation energy spectrum. The existence of a third minimum in the fission barrier of 238 Np is also supported by nuclear reaction code (TALYS1.4) calculations which was used to describe the experimental data.

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Tunneling Through Triple-Humped Fission Barriers

Cited by 17 publications

References 57 publications

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

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

Towards experiments at the new ELI-NP facility

Transmission Resonance Spectroscopy of the Doubly Odd $^{238}$Np in ($d$,pf) Reaction

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