Determination of Nuclear Charge Distributions of Fission Fragments from $$^{235}$$ 235 U ( $$n_\mathrm{th}$$ n th , f) with Calorimetric Low Temperature Detectors

Grabitz, P.; Andrianov, V. A.; Bishop, S.; Blanc, A.; Dubey, S.; Echler, A.; Egelhof, P.; Faust, H.; Gönnenwein, F.; Gómez-Guzmán, J.M.; Köster, U.; Kraft‐Bermuth, S.; Mutterer, M.; Scholz, P.; Stolte, Stefan

doi:10.1007/s10909-016-1566-0

Cited by 7 publications

(3 citation statements)

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“…Still, the accuracy of the absolute-yield determination may be limited by the knowledge of the γ-ray intensities per decay, and this method is not applicable for the yield measurement of very long-lived or stable fission fragments. Thus, at present, an independent development is pursued to push the limits of the ∆E-E method, namely by using very homogeneous Si 3 N 4 membranes as passive absorbers combined with calorimetric lowtemperature detectors for a pulse-height-defectfree determination of the residual energy [70]. Other examples of the FFs pre-separation method, but in inverse kinematics, which boosts the FFs energies, include the fission experiments at the VAMOS [39] at GANIL and at FRS(FRagment Separator) at GSI [40,41,71,11], see Section 3.5.…”

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

confidence: 99%

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%

Nuclear fission: a review of experimental advances and phenomenology

2017

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“…However, the adaption of the cryogenic system to the LOHENGRIN beam line affected the CLTD energy resolution by heat radiation and, accordingly, required an entrance slit of ̴ 200 mm². In a first attempt [12], SiN absorbers were mounted on a movable manipulator at a distance of 95cm outside the cryostat. This resulted in largely reduced counting efficiency due to small-angle scattering and increased the background by contaminating mass lines.…”

Section: Properties Of Cltd's For Particle Detectionmentioning

confidence: 99%

“…Furthermore, in a preceding experiment [12], stacks of commercially available silicon nitride (SiN) membranes [13] were tested as degrader material, replacing the previously used Parylene-C plastic foils. Silicon nitride is a modern highly resistant material out of which stable and homogeneous membranes thinner than 100 nm can be fabricated by lithographic techniques.…”

Section: Introductionmentioning

confidence: 99%

Application of Calorimetric Low-Temperature Detectors for the Investigation of Z-Yield Distributions of Fission Fragments

et al. 2018

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In recent experiments, the new concept of calorimetric lowtemperature detectors (CLTDs) was applied for the first time for the investigation of isotopic yields of fission fragments. Fragments from neutron-induced fission sources were mass-separated by the LOHENGRIN spectrometer at the ILL Grenoble and, after passing silicon nitride membranes used as degraders, detected in a CLTD array. The new detector concept of a thermal detector provides a fundamental advantage over conventional ionization-mediated detectors, in particular for heavier particle masses at low energies. Using fissile targets of 235 U, 239 Pu and 241 Pu, nuclearcharge separation was studied in the mass region 82 ≤ A ≤ 139. For light fragments, the Z resolution matches historically best values with conventional techniques, while for heavier masses substantial improvement was attained. We have gained first LOHENGRIN data on the isotopic yields in the light-mass group of 241 Pu. Towards mass-symmetry, known Z-yield data were supplemented in the range A = 110 to 113 for 241 Pu and 239 Pu. Extended data sets were cumulated for A = 92 and 96 due to a recent request from studies on the reactor anti-neutrino spectrum. Furthermore, considerable progress was achieved to extend isotopic yield measurements up to the heavy-mass region, hardly accessible until now.

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Construction of high-resolution energy—time-of-flight spectrometer for determination of fission fragment mass distributions

Liu

2022

Radiat Detect Technol Methods

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Determination of Nuclear Charge Distributions of Fission Fragments from $$^{235}$$ 235 U ( $$n_\mathrm{th}$$ n th , f) with Calorimetric Low Temperature Detectors

Cited by 7 publications

References 7 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Application of Calorimetric Low-Temperature Detectors for the Investigation of Z-Yield Distributions of Fission Fragments

Construction of high-resolution energy—time-of-flight spectrometer for determination of fission fragment mass distributions

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