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Journal Articles

New excited 2$$^+$$ and 3$$^-$$ two-proton states in $$_{84}^{210}$$Po$$_{126}$$ populated by two-proton transfer

Dupont, E.*; Astier, A.*; Petrache, C. M.*; Lv, B. F.*; Deloncle, I.*; Kiener, J.*; Orlandi, R.; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; et al.

Physical Review C, 101(1), p.014309_1 - 014309_6, 2020/01

 Times Cited Count:0 Percentile:0.02(Physics, Nuclear)

Oral presentation

Nuclear structure studies of $$^{254}$$Es region by Coulomb excitation $$gamma$$-ray spectroscopy

Yanagihara, Rikuto; Ideguchi, Eiji*; Nishio, Katsuhisa; Orlandi, R.; Makii, Hiroyuki; Asai, Masato; Hirose, Kentaro; Tsukada, Kazuaki; Toyoshima, Atsushi; Sato, Tetsuya; et al.

no journal, , 

Oral presentation

Spontaneous fission measurements for nuclei around neutron-rich Fm region produced by using an $$^{254}$$Es target

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi; Tomitsuka, Tomohiro; Chiera, N. M.; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro; Nishio, Katsuhisa; et al.

no journal, , 

Spontaneous fissions of $$^{256}$$Fm, $$^{258}$$Fm, and $$^{259}$$Lr have been measured using an $$^{254}$$Es target at the JAEA Tandem Accelerator Facility. These three nuclei show different fission properties: the asymmetric fission, the high total-kinetic-energy (TKE) symmetric fission, and the low TKE symmetric fission, and the mechanisms of these three fissions should be very different. It is of great interest to elucidate how these differences occur. We have produced $$^{256,258}$$Fm in multinucleon-transfer reactions with a $$^{254}$$Es target and $$^{18}$$O projectiles, and produced $$^{259}$$Lr in the $$^{248}$$Cm($$^{15}$$N,4n) fusion-evaporation reaction. The reaction products were mass-separated with a gas-jet-coupled on-line isotope separator, and were delivered into a rotating wheel alpha- and fission-fragment detection system. By comparing the mass and TKE distributions deduced from the present experimental data, we will discuss the differences in fission mechanism among $$^{256}$$Fm, $$^{258}$$Fm, and $$^{259}$$Lr.

Oral presentation

Spontaneous fission measurements for neutron-rich Fm isotopes using an $$^{254}$$Es target

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi; Tomitsuka, Tomohiro; Chiera, N. M.; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro; Nishio, Katsuhisa; et al.

no journal, , 

Spontaneous fissions of neutron-rich heavy actinide isotopes $$^{256}$$Fm, $$^{258}$$Fm, and $$^{259}$$Lr have been measured at the JAEA Tandem accelerator facility. $$^{256}$$Fm and $$^{258}$$Fm were produced in a multinucleon transfer reaction with an $$^{18}$$O beam and an extremely rare $$^{254}$$Es target with a half-life of 276 days. Reaction products were mass-separated with an on-line isotope separator (ISOL). A transition between the typical asymmetric mass distribution and a very sharp symmetric one was clearly observed between $$^{256}$$Fm and $$^{258}$$Fm, while the spontaneous fission of $$^{259}$$Lr was found to exhibit mixture of three different fission modes.

Oral presentation

Spontaneous fission studies for neutron-rich Fm and Lr isotopes

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi*; Tomitsuka, Tomohiro*; Chiera, N. M.*; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro*; Nishio, Katsuhisa; et al.

no journal, , 

We have studied spontaneous fission of neutron-rich Fm and Lr isotopes. The neutron-rich Fm isotopes were produced with the $$^{254}$$Es target and the $$^{18}$$O beam delivered by the JAEA tandem accelerator. The neutron-rich Lr isotope were produced with the $$^{248}$$Cm target and the $$^{15}$$N beam. Reaction products were mass-separated with an on-line isotope separator (ISOL), which enabled us to obtain non-contaminated samples and to measure fission fragments precisely. From the deduced fission-fragment mass and total kinetic energy distributions, we have obtained a new insight into the competition between the symmetric and asymmetric fission which is characteristic in this neutron-rich region.

Oral presentation

Spontaneous fission measurements for neutron-rich Fm and Lr isotopes using $$^{254}$$Es target

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi*; Tomitsuka, Tomohiro*; Chiera, N. M.*; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro*; Nishio, Katsuhisa; et al.

no journal, , 

Neutron-rich fermium isotopes $$^{256}$$Fm and $$^{258}$$Fm and lawrencium isotope $$^{259}$$Lr were produced in the multinucleon transfer reaction on $$^{254}$$Es target with heavy-ion beam and in the heavy-ion fusion reaction on $$^{248}$$Cm target with $$^{15}$$N beam, respectively. Reaction products were mass-separated with an on-line isotope separator (ISOL), and spontaneous fission (SF) of these isotopes were measured. It was found that the mass distribution of the SF of $$^{256}$$Fm was asymmetric, while that of $$^{258}$$Fm was sharp symmetric, which confirmed the previous experimental results. On the other hand, the SF of $$^{259}$$Lr seemed to contain both symmetric and asymmetric mass distributions. On the basis of the present results of the mass and total kinetic energy distributions, we discussed the mechanism of fission for these isotopes.

Oral presentation

Study of $$^{249}$$Cf by Coulomb excitation gamma-ray spectroscopy

Pham, T. T.*; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.; Nishio, Katsuhisa; Makii, Hiroyuki; Asai, Masato; Hirose, Kentaro; Tsukada, Kazuaki; Toyoshima, Atsushi*; et al.

no journal, , 

Oral presentation

Study of $$^{249}$$Cf by Coulomb excitation gamma-ray spectroscopy

Pham, T. T.; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.; Nishio, Katsuhisa; Makii, Hiroyuki; Hirose, Kentaro; Asai, Masato; Tsukada, Kazuaki

no journal, , 

Oral presentation

Fission of $$^{258}$$Md produced in the $$^{4}$$He + $$^{254}$$Es reaction

Nishio, Katsuhisa; Hirose, Kentaro; Makii, Hiroyuki; Orlandi, R.; Kean, K. R.*; Tsukada, Kazuaki; Toyoshima, Atsushi*; Asai, Masato; Sato, Tetsuya; Chiela, N. M.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Fission of $$^{258}$$Md produced in the $$^{4}$$He + $$^{254}$$Es reaction

Nishio, Katsuhisa; Hirose, Kentaro; Makii, Hiroyuki; Orlandi, R.; Kean, K. R.*; Tsukada, Kazuaki; Toyoshima, Atsushi*; Asai, Masato; Sato, Tetsuya; Chiela, N. M.*; et al.

no journal, , 

no abstracts in English

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