Prompt fission neutron emission: Problems and challenges

Hambsch, F.‐J.; Bryś, T.; Gamboni, T.; Geerts, W.; Göök, Alf; Matei, C.; Oberstedt, S.; Vidali, M.

doi:10.1051/epjconf/20136202001

Cited by 1 publication

(6 citation statements)

References 15 publications

(20 reference statements)

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“…A c c e p t e d M a n u s c r i p t servables, including prompt neutron [58,59] and γ-ray multiplicities [60,61,62,63]. We note that similar detection methods are also exploited in the SF and βDF studies, but some sort of preseparation (chemical or electromagnetic) of the fissioning parent nucleus is often used in such cases, see Sections 4.4 and 4.1.…”

Section: Page 6 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

“…Usually, the mass of the fissioning nucleus is treated to be equal to the sum of the masses of projectile and target nuclei for the fusion-fission reactions. However, the influence of prompt neutron emission [58,59] should be carefully considered caseby-case, see e.g. the discussion of reactions in the mercury region in Section 4.1.3 and also in the actinide region in Figs.…”

Section: 11mentioning

confidence: 99%

“…A c c e p t e d M a n u s c r i p t more elaborate setup for the correlation measurement between FFs and neutrons, see the recent study [59].…”

Section: Page 10 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

“…Silicon detectors, multi-wire proportional chambers (MWPC), or time-of-flight (TOF) detectors are often used for FFs detection, see section 3.1. With a proper choice of ancillary detectors, this method can further allow an access to a wide range of fission observables, including prompt neutron [58,59] and γ-ray multiplicities [60][61][62][63]. We note that similar detection methods are also exploited in the SF and βDF studies, but some sort of pre-separation (chemical Often, a competition with the so-called quasifission (QF) occurs in reactions with heavy ions, which is the prompt fission from a nonfully equilibrated composite system, shown in the figure, before the CN is formed; (b) Multi-nucleon transfer (MNT) reactions, whereby one or several nucleons can be transferred to (or picked up from) the target nucleus to produce an excited CN and an outgoing ejectile.…”

Section: Beams Direct Kinematics Inverse Kinematicsmentioning

confidence: 99%

“…Usually, the mass of the fissioning nucleus is treated to be equal to the sum of the masses of projectile and target nuclei for the fusion-fission reactions. However, the influence of prompt-neutron emission [58,59] should be carefully considered case-by-case, O+ 238 U was studied, whereby four MWPCs-MWPC-A-MWPC-D-were used to detect the coincident fission fragments, while a silicon ∆E-E telescope array was exploited to determine the transfer channel. In case of the fusion-fission experiments, the ∆E-E telescope array is removed.…”

Section: Typical Setups For Prompt Fusion-fission Experimentsmentioning

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: Page 6 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

Section: 11mentioning

confidence: 99%

“…A c c e p t e d M a n u s c r i p t more elaborate setup for the correlation measurement between FFs and neutrons, see the recent study [59].…”

Section: Page 10 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

Section: Beams Direct Kinematics Inverse Kinematicsmentioning

confidence: 99%

“…Usually, the mass of the fissioning nucleus is treated to be equal to the sum of the masses of projectile and target nuclei for the fusion-fission reactions. However, the influence of prompt-neutron emission [58,59] should be carefully considered case-by-case, O+ 238 U was studied, whereby four MWPCs-MWPC-A-MWPC-D-were used to detect the coincident fission fragments, while a silicon ∆E-E telescope array was exploited to determine the transfer channel. In case of the fusion-fission experiments, the ∆E-E telescope array is removed.…”

Section: Typical Setups For Prompt Fusion-fission Experimentsmentioning

confidence: 99%

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