Measurements ofγ-ray Energy and Multiplicity from235U(nthermal) using STEFF

Pollitt, Andrew; Smith, A. G.; Tsekhanovich, I.; Dare, J. A.; Murray, Lilian S.

doi:10.1051/epjconf/20159302018

Cited by 5 publications

(26 citation statements)

References 3 publications

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“…The design goal is to achieve a mass resolution of A/∆A ∼ 130. Other recently developed 2v-2E spectrometers are the STEFF (SpecTrometer for Exotic Fission Fragments), built by the University of Manchester [178], and the SPIDER (SPectrometer for Ion DEtermination in fission Research) [179] at LANSCE (Los Alamos), which are exploited in neutron-induced-fission experiments, see Section 3.2.3 for further details.…”

Section: 12mentioning

confidence: 99%

“…Some experiments at n − TOF use the recently developed two-arms 2v-2E fission spectrometer STEFF [178], which is presently installed at the EAR2 flight path. A single common start signal for the fragments's T O Fm e a s u r e m e n t si sp r o v i d e db yas i n g l eM C P detector in one of the arms, while the stop signals are given by two MWPC secondary-electron mirror stop detectors.…”

Section: Fission With Neutron Spallation Sources At N − Tof At Cern mentioning

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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Section: 12mentioning

confidence: 99%

Section: Fission With Neutron Spallation Sources At N − Tof At Cern mentioning

confidence: 99%

Nuclear fission: a review of experimental advances and phenomenology

2017

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“…At least four of these devices are under development (e.g. STEFF [5], SPIDER [6], FALSTAFF [7] and VERDI [8]). Eventually the devices will be used with fast neutron beams available at new facilities such as NFS.…”

Section: E-2v Measurementsmentioning

confidence: 99%

Studies of fission fragment yields via high-resolution γ-ray spectroscopy

Wilson

Lebois

et al. 2018

EPJ Web Conf.

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Precise spectroscopic information on the fast neutron induced fission of the 238U(n,f) reaction was recently gained using a new technique which involved coupling of the Miniball high resolution y-ray spectrometer and the LICORNE directional neutron source. The experiment allowed measurement of the isotopic fission yields for around 40 even-even nuclei at an incident neutron energy of around 2 MeV where yield data are very sparse. In addition spectroscopic information on very neutron-rich fission products was obtained. Results were compared to models, both the JEFF-3.1.1 data base and the GEF code, and large discrepancies for the S1 fission mode in the Sn/Mo isotope pair were discovered. This suggests that current models are overestimating the role played by spherical shell effects in fast neutron induced fission. In late 2017 and 2018 the nu-ball hybrid spectrometer will be constructed at the IPN Orsay to perform further experimental investigations with directional neutrons coupled to a powerful hybrid Ge/LaBr3 detector array. This will open up new possibilities for measurements of fission yields for fast-neutron-induced fission using the spectroscopic technique and will be complimentary to other methods being developed.

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“…In 2015, the commissioning of EAR2 continued, exploring the possibilities of (n,γ ) measurements, for applications in nuclear astrophysics [35] and nuclear technology, as well as neutron-induced charged particle reactions like the 7 Be(n,α) and 7 Be(n,p) experiments. The complex multidetector system STEFF [36] was installed in EAR2 for commissioning and a measurement of fission fragments spectroscopy on 235 U. Silicon strip detectors were used in EAR2 for a 26 Al(n,α) measurement.…”

Section: Nuclear Data Measurements At N Tofmentioning

confidence: 99%

The measurement programme at the neutron time-of-flight facility n_TOF at CERN

Gunsing¹,

Aberle²,

Andrzejewski³

et al. 2017

EPJ Web Conf.

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Abstract. Neutron-induced reaction cross sections are important for a wide variety of research fields ranging from the study of nuclear level densities, nucleosynthesis to applications of nuclear technology like design, and criticality and safety assessment of existing and future nuclear reactors, radiation dosimetry, medical applications, nuclear waste transmutation, accelerator-driven systems and fuel cycle investigations. Simulations and calculations of nuclear technology applications largely rely on evaluated nuclear data libraries. The evaluations in these libraries are based both on experimental data and theoretical models. CERN's neutron time-of-flight facility n TOF has produced a considerable amount of experimental data since it has become fully operational with the start of its scientific measurement programme in 2001. While for a long period a single measurement station (EAR1) located at 185 m from the neutron production target was available, the construction of a second beam line at 20 m (EAR2) in 2014 has substantially increased the measurement capabilities of the facility. An outline of the experimental nuclear data activities at n TOF will be presented.

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Measurements ofγ-ray Energy and Multiplicity from²³⁵U(n_thermal) using STEFF

Cited by 5 publications

References 3 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Studies of fission fragment yields via high-resolution γ-ray spectroscopy

The measurement programme at the neutron time-of-flight facility n_TOF at CERN

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