The SOFIA experiment: Measurement of<sup>236</sup>U fission fragment yields in inverse kinematics

Grente, L.; Taïeb, J.; Chatillon, A.; Martin, Julie-Fiona; Pellereau, E.; Boutoux, G.; Gorbinet, T.; Bélier, G.; Bouchet, L.; Álvarez‐Pol, H.; Ayyad, Y.; Benlliure, J.; Caamaño, M.; Audouin, L.; Casarejos, E.; Cortina-Gil, D.; Farget, F.; Fernández–Domínguez, B.; Heinz, A.; Jurado, B.; Kelić-Heil, A.; Kurz, N.; Lindberg, Simon; Löher, B.; Nociforo, C.; Paradela, C.; Ramos, D.; Rodríguez-Sànchez, J. L.; Rodríguez–Tajes, C.; Rossi, D.; Schmidt, K.‐H.; Simon, H.; Tassan‐Got, L.; Törnqvist, H.; Vargas, J. E. Ramirez; Voss, B.; Weick, H.; Yan, Y.

doi:10.1051/epjconf/201612201006

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Interestingly, theν(A) data for 233 U(n th ,f)( Fig. 63(a)) and 252 Cf(sf) (Fig. 64) show that the hump at A∼138 is commonly observed for both reactions.…”

Section: 52mentioning

confidence: 98%

“…Open triangles and thick dots show the isotopes for which SF was discovered or their properties were re-studied since or before ∼1995, respectively. The highly variable fission-barrier heights are mostly due to the ground-state shell effects, which are particularly strong in the deformed regions around 252 100 Fm 152 , 270 108 Hs 162 and in the nearly spherical region in the red right-hand upper corner of the plot, near the next doubly magic nuclide postulated to be at Fl 184 (not shown in the plot). The figure is modified from [9].…”

Section: Fusion-fission and Quasifission Phenomena Inmentioning

confidence: 99%

“…The experiments in inverse kinematics at GANIL and GSI provide valuable information not only on the nature but also on the kinematical properties of one or both fragments of a fission event, respectively. Besides the measurement of individual fission-product atomic numbers, masses and kinetic energies after promptneutron emission [84,28,252], also mean pre-neutron fragment masses were derived from the mean velocities of complementary fission products [85]. Moreover, properties of the scission configuration such as the distance between fragments, the neutron multiplicity, the total excitation energy, and the proton-and neutron-number sharing during the emergence of the fragments are reported [85].…”

Section: Double-humped (Asymmetric)mentioning

confidence: 99%

“…(Color online) Local odd-even effect δp(Z) (defined by equation (1)) in the element distributions for electromagneticinduced fission of234,235,236,238 Um e a s u r e di nt h eS O F I A experiment, given in percent.The yellow line indicates the average increase of the odd-even effect as a function of asymmetry. The figure is taken from Ref [252]…”

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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“…Interestingly, theν(A) data for 233 U(n th ,f)( Fig. 63(a)) and 252 Cf(sf) (Fig. 64) show that the hump at A∼138 is commonly observed for both reactions.…”

Section: 52mentioning

confidence: 98%

Section: Fusion-fission and Quasifission Phenomena Inmentioning

confidence: 99%

Section: Double-humped (Asymmetric)mentioning

confidence: 99%

mentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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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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The difference between charge polarizations of fission fragments deduced by the static theoretical model and in the current data library

Ebata,

Okumura,

Ishizuka

et al. 2023

Int. J. Mod. Phys. E

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In this paper, we propose a theoretical method to deduce the charge polarization (CP) and most probable charge for fission fragments for the selected range of mass numbers based on a quantum many-body framework, namely, a constrained Skyrme Hartree–Fock[Formula: see text]BCS model. We investigate the CP on the low energy neutron-induced fission of [Formula: see text]U as a representative reaction. We have found that the calculated CP has a noticeable dip that is clearly affected by the spherical shell structure around [Formula: see text]Sn and deformed one around [Formula: see text]144 and a peak for their counterparts, which are common features to those of widely-used Wahl’s systematics, but otherwise, our CP values converge to zero. Especially, we could not see a deep valley and a big hump in the region of symmetric fission at [Formula: see text]112 and 124 present in Wahl’s systematics. The gradient of our CP near the symmetric fission is negative concerning the mass number of fission fragments, which is consistent with other previous theoretical studies; however, that is the opposite of the gradient in Wahl’s systematics. This paper shows the difference between the charge distribution of fission fragments, which has been used practically so far, in comparison with the calculation by microscopic nuclear theory.

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The SOFIA experiment: Measurement of²³⁶U fission fragment yields in inverse kinematics

Cited by 3 publications

References 8 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 difference between charge polarizations of fission fragments deduced by the static theoretical model and in the current data library

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The SOFIA experiment: Measurement of236U fission fragment yields in inverse kinematics

Cited by 3 publications

References 8 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 difference between charge polarizations of fission fragments deduced by the static theoretical model and in the current data library

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Product

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The SOFIA experiment: Measurement of²³⁶U fission fragment yields in inverse kinematics