Measurement of energy spectra and spatial distributions of neutron beams provided by the ANNRI beamline for capture cross-section measurements at the J-PARC/MLF

Kino, K.; Furusaka, M.; Hiraga, Fujio; Kamiyama, Takashi; Kiyanagi, Yoshiaki; Furutaka, Kazuyoshi; Goko, S.; Harada, Hiroyuki; Harada, Masahide; Kai, Tetsuya; Kimura, A.; Kin, Tadahiro; Kitatani, Fumito; Koizumi, M.; Maekawa, Fujio; Meigo, Shin-ichiro; Nakamura, Shôji; Ooi, Motoki; Ohta, M.; Oshima, M.; Toh, Y.; Igashira, M.; Katabuchi, Tatsuya; Mizumoto, M.

doi:10.1016/j.nima.2010.10.076

Cited by 53 publications

(27 citation statements)

References 12 publications

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“…A good agreement between measured and calculated FFMDs can be noted for many nuclides, shown in the plot, e.g. for 180 Hg, 201 Tl, 210 Po, 204,208 Rn, 210 Ra.…”

Section: 1supporting

confidence: 57%

“…These results establish a multimodal fission for these three isotopes, lying in the transitional region between the asymmetry of 178,180 Hg and symmetry of e.g. 204,208 Rn and 210 Ra.…”

Section: 12supporting

confidence: 54%

“…The ANNRI spectra, which were deduced under the 120 kW operation in the 2009 Japanese fiscal year and the expected spectrum under the future 1 MW operation, are shown also. The figure is taken from [208]. A c c e p t e d M a n u s c r i p t neutron intensity obtained at the ANNRI's target station.…”

Section: Page 17 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around [Formula: see text]Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.

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“…A good agreement between measured and calculated FFMDs can be noted for many nuclides, shown in the plot, e.g. for 180 Hg, 201 Tl, 210 Po, 204,208 Rn, 210 Ra.…”

Section: 1supporting

confidence: 57%

“…These results establish a multimodal fission for these three isotopes, lying in the transitional region between the asymmetry of 178,180 Hg and symmetry of e.g. 204,208 Rn and 210 Ra.…”

Section: 12supporting

confidence: 54%

Section: Page 17 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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“…At present there are several neutron ToF facilities in the world devoted to the measurement of neutron-induced reactions cross sections. These use different methods for neutron production and have flight path lengths ranging between less than one meter to 400 m. Among these, the most active in the recent years are (flight paths are given in parenthesis) the n TOF facility [11][12][13][14] (185 m) discussed further in this paper, GELINA at JRC-IRMM in Belgium [15] (10,30,50,60,100,200, 300 and 400 m), DANCE at LANSCE in the USA [16] (20 m) and AN-NRI at J-PARK in Japan [17] (22 and 28 m). In addition, two new facilities will soon become operational in Europe: n TOF-EAR2 at CERN in Switzerland [18] (20 m) and FRANZ in Germany [19] (0.8 m).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Performance of the neutron time-of-flight facility n_TOF at CERN

Guerrero¹,

Tsinganis²,

Berthoumieux³

et al. 2013

Eur. Phys. J. A

229

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Abstract. The neutron time-of-flight facility n TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities.

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“…The neutron beams are collimated to diameters of 3, 7, 15, and 22 mm with the collimator closest to the sample position. The energyintegrated neutron intensities at the sample position are 5.2 6 10 10 n/s/m 2 in the neutron energy range of 1.5-25 meV and 7.2 6 10 9 n/s/m 2 in 0.9-1.1 keV under a proton beam power of 120 kW [14].…”

Section: Overview Of the Annrimentioning

confidence: 93%

Neutron-capture cross-sections of²⁴⁴Cm and²⁴⁶Cm measured with an array of large germanium detectors in the ANNRI at J-PARC/MLF

Kimura

Fujii

Fukutani

et al. 2012

Journal of Nuclear Science and Technology

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2012) Neutron-capture cross-sections of 244 Cm and 246 Cm measured with an array of large germanium detectors in the ANNRI at The neutron neutron-capture cross cross-sections of 244 Cm and 246 Cm were measured by the time-offlight method in the energy range of 1-300 300 eV with an array of large germanium detectors in the Accurate Neutron-Nucleus Reaction measurement InstrumentANNRI at Material and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research ComplexJ-PARC/MLF. The 244Cm resonances at around 7.7 and 16.8 8 eV and the 246 Cm resonances at around 4.3 and 15.3 3 eV were observed in the capture reactions for the first time. The uncertainties of the obtained cross crosssections are 5.8% at the top of the first resonance of 244 Cm and 6.6% at that of 246 Cm. The rResonance analyses were performed for low-energy ones using the code SAMMY. The prompt g-ray spectra of 244 Cm and 246 Cm were also obtained. Eight and five new prompt g-ray emissions were observed in the 244 Cm(n, g) and 246 Cm(n, g) reactions, respectively.

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Measurement of energy spectra and spatial distributions of neutron beams provided by the ANNRI beamline for capture cross-section measurements at the J-PARC/MLF

Cited by 53 publications

References 12 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Performance of the neutron time-of-flight facility n_TOF at CERN

Neutron-capture cross-sections of²⁴⁴Cm and²⁴⁶Cm measured with an array of large germanium detectors in the ANNRI at J-PARC/MLF

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Measurement of energy spectra and spatial distributions of neutron beams provided by the ANNRI beamline for capture cross-section measurements at the J-PARC/MLF

Cited by 53 publications

References 12 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Performance of the neutron time-of-flight facility n_TOF at CERN

Neutron-capture cross-sections of244Cm and246Cm measured with an array of large germanium detectors in the ANNRI at J-PARC/MLF

Contact Info

Product

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About

Neutron-capture cross-sections of²⁴⁴Cm and²⁴⁶Cm measured with an array of large germanium detectors in the ANNRI at J-PARC/MLF