The SOFIA Experiment

Boutoux, G.; Bélier, G.; Chatillon, A.; Ebran, A.; Gorbinet, T.; Bouchet, L.; Martin, J. F.; Pellereau, E.; Taïeb, J.; Audouin, L.; Tassan‐Got, L.; Jurado, B.; Álvarez‐Pol, H.; Ayyad, Y.; Benlliure, J.; Caamaño, M.; Cortina-Gil, D.; Fernández–Domínguez, B.; Paradela, C.; Rodríguez-Sànchez, J. L.; Vargas, J. E. Ramirez; Casarejos, E.; Heinz, A.; Kelić-Heil, A.; Kurz, N.; Nociforo, C.; Procházka, A.; Rossi, D.; Schmidt, Karl‐Heinz; Simon, H.; Voss, B.; Weick, H.; Winfield, J. S.

doi:10.1016/j.phpro.2013.06.024

Cited by 28 publications

(41 citation statements)

References 2 publications

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“…10 (a). Furthermore, 11 B, 10,9 Be nuclei were observed. The transfer of a 4 He nucleus lead to 8 Be, which decayed into two highlycorrelated α particles, its half-life being T 1/2 ∼ 8 · 10 −17 s. When they hit the same ring and sector of both ∆E and E res detectors, they populated the same ∆E-E region as 7 Li in the identification matrices of Fig.…”

Section: Discussionmentioning

confidence: 94%

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

et al. 2014

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Inelastic and multi-nucleon transfer reactions between a 238 U beam, accelerated at 6.14 MeV/u, and a 12 C target were used for the production of neutron-rich, fissioning systems from U to Cm. A Si telescope, devoted to the detection of the target-like nuclei, provided a characterization of the fissioning systems in atomic and mass numbers, as well as in excitation energy. Cross-sections, angular and excitation-energy distributions were measured for the inelastic and transfer channels. Possible excitations of the target-like nuclei were experimentally investigated for the first time, by means of γ-ray measurements. The decays from the first excited states of 12 C, 11 B and 10 Be were observed with probabilities of 0.12 -0.14, while no evidence for the population of higher-lying states was found. Moreover, the fission probabilities of 238 U, 239 Np and 240,241,242 Pu and 244 Cm were determined as a function of the excitation energy.

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Section: Discussionmentioning

confidence: 94%

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

et al. 2014

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“…Around 2000 GSI developed a Coulexinduced fission of relativistic RIBs in inverse kinematics, comprehensive fission studies were performed for several tens of nuclei in the neutron-deficient Ac-U region [3]. The recent SOFIA experiment at GSI also followed the same approach but with a much improved technique [4]. Recently, β/EC delayed fission was investigated for the a e-mail: nishio.katsuhisa@jaea.go.jp very proton-rich nucleus using radioactive beams, and 180 Hg was found to show an asymmetric fission as a new region of mass-asymmetric fission [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental fission study using multi-nucleon transfer reactions

et al. 2017

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Abstract. It is shown that the multi-nucleon transfer reactions is a powerful tool to study fission of exotic neutron-rich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, multi-nucleon transfer channels of the reactions of 18 O+ 232 Th, 18 O+ 238 U and 18 O+ 248 Cm are used to study fission for various nuclei from many excited states. Identification of fissioning nuclei and of their excitation energy is performed on an event-by-event basis, through the measurement of outgoing ejectile particle in coincidence with fission fragments. Fission fragment mass distributions are measured for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all studied cases, with a gradual increase of the symmetric mode towards higher excitation energy. The experimental distributions are found to be in general agreement with predictions of the fluctuation-dissipation model. Role of multi-chance fission in fission fragment mass distributions is discussed, where it is shown that massasymmetric structure remaining at high excitation energies originates from low-excited nuclei by evaporation of neutrons.

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“…Around 2000, GSI in Darmstadt developed a Coulex-induced fission of relativistic RIBs in inverse kinematics, where comprehensive fission studies were performed for several tens of nuclei in the neutron-deficient Ac-U region [3]. The recent SOFIA experiment at GSI also followed the same approach but with a much improved technique [4,5]. Recently, β/EC delayed fission was investigated for the very proton-rich nucleus using radioactive beams, and 180 Hg was found to show an asymmetric fission as a new region of massasymmetric fission [6].…”

Section: Introductionmentioning

confidence: 99%

Study of fission using multi-nucleon transfer reactions

et al. 2017

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Abstract. It is shown that multi-nucleon transfer reaction is a powerful tool to study fission of exotic neutronrich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, multi-nucleon transfer channels of the reactions of 18 O+ 232 Th, 18 O+ 238 U, 18 O+ 248 Cm, and 18 O+ 237 Np were used to measure fission-fragment mass distribution for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all the studied cases, with an increase of the symmetric fission towards high excitation energies. Experimental data are compared with predictions of the fluctuation-dissipation model, where effects of multi-chance fission (neutron evaporation prior to fission) was introduced. It is shown that mass-asymmetric structure remaining at high excitation energies originates from low-excited and less neutronrich excited nuclei due to higher-order chance fissions.

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The SOFIA Experiment

Cited by 28 publications

References 2 publications

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

Experimental fission study using multi-nucleon transfer reactions

Study of fission using multi-nucleon transfer reactions

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