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Journal Articles

$$beta$$-delayed neutron-emission and fission calculations within relativistic quasiparticle random-phase approximation and a statistical model

Minato, Futoshi; Marketin, T.*; Paar, N.*

Physical Review C, 104(4), p.044321_1 - 044321_18, 2021/10

 Times Cited Count:17 Percentile:95.71(Physics, Nuclear)

A role of $$beta$$-delayed neutron and fission in r-process nucleosynthesis attracts a high interest. Although the number of study on them covering r-process nuclei is increasing recently, uncertainties of $$beta$$-delayed neutron and fission are still large for r-process simulations. Our purpose of this paper is to make a new database on $$beta$$-delayed neutron and fission. We developed a new theoretical framework for $$beta$$-delayed neutron and fission, and apply it to make a new data table. Calculated $$beta$$-delayed neutron branching ratios are in a good agreement with experimental data and the root mean square deviation is comparable to results of proceeding works. It is found that energy withdrawal by $$beta$$-delayed neutron emission sensitively varies Pn values for nuclei near the neutron drip line. Pf are sensitively dependent on fission barrier data. The new data table is to be used for study on r-process as well as other fields such as nuclear engineering.

Journal Articles

Development of a reference database for beta-delayed neutron emission

Dimitriou, P.*; Dillmann, I.*; Singh, B.*; Piksaikin, V.*; Rykaczewski, K. P.*; Tain, J. L.*; Algora, A.*; Banerjee, K.*; Borzov, I. N.*; Cano-Ott, D.*; et al.

Nuclear Data Sheets, 173, p.144 - 238, 2021/03

 Times Cited Count:16 Percentile:96.39(Physics, Nuclear)

$$beta$$-delayed neutron emission has been of interest since the discovery of nuclear fission. In nuclear power reactors, delayed-neutron data play a crucial role in reactor kinetics calculations and safe operation. $$beta$$-delayed neutron data also have a significant impact in the field of nuclear structure and astrophysics especially as nuclei farther away from stability are explored at the new generation of radioactive beam facilities. Several compilations of $$beta$$-decay half-lives and delayed-neutron emission probabilities are available, however, complete documentation of measurements and evaluation procedures is often missing for these properties. Efforts to address this gap in nuclear data and create an updated compilation and evaluation of $$beta$$-delayed neutron properties were undertaken under the auspices of the International Atomic Energy Agency (IAEA) which formed a Coordinated Research Project (CRP) on "Development of a Reference Database of Beta-delayed Neutron Emission Data". In this paper we summarize the work that was performed and present the results of the CRP.

Journal Articles

Experimental study of the $$Gamma_{p1}/Gamma_{p0}$$ ratios of resonance states in $$^{8}$$Be for deducing the $$^{7}$$Be($$n$$,$$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the cosmological lithium problem

Iwasa, Naohito*; Ishikawa, Shunki*; Kubono, Shigeru*; Sakakibara, T.*; Kominato, Kazuya*; Nishio, Katsuhisa; Matsuda, Makoto; Hirose, Kentaro; Makii, Hiroyuki; Orlandi, R.; et al.

Physical Review C, 103(1), p.015801_1 - 015801_5, 2021/01

 Times Cited Count:1 Percentile:22.4(Physics, Nuclear)

Journal Articles

A Review of separation processes proposed for advanced fuel cycles based on technology readiness level assessments

Baron, P.*; Cornet, S. M.*; Collins, E. D.*; DeAngelis, G.*; Del Cul, G.*; Fedorov, Y.*; Glatz, J. P.*; Ignatiev, V.*; Inoue, Tadashi*; Khaperskaya, A.*; et al.

Progress in Nuclear Energy, 117, p.103091_1 - 103091_24, 2019/11

 Times Cited Count:54 Percentile:92.72(Nuclear Science & Technology)

The results of an international review of separation processes for spent nuclear fuel (SNF) recycling in future closed fuel cycles with the evaluation of Technology Readiness Level are reported. This study was made by the Expert Group on Fuel Recycling Chemistry (EGFRC) organised by the Nuclear Energy Agency (NEA) of the Organisation for Economic Co-operation and Development (OECD). A unique feature of this study was that processes were classified according to a hierarchy of separations aimed at different elements within spent fuel (uranium; uranium-plutonium co-recovery; minor actinides; high heat generating radionuclides) and also the Head-end processes, used to prepare the SNF for chemical separation, were included. Separation processes covered both wet (hydrometallurgical) and dry (pyro-chemical) processes.

Journal Articles

Precision hfs of $$^{126}$$Cs($$T$$$$_{1/2}$$ = 1.63 m) by ABMR

Pinard, J.*; Duong, H. T.*; Marescaux, D.*; Stroke, H. H.*; Redi, O.*; Gustafsson, M.*; Nilsson, T.*; Matsuki, S.*; Kishimoto, Yasuaki*; Kominato, K.*; et al.

Nuclear Physics A, 753(1-2), p.3 - 12, 2005/05

 Times Cited Count:4 Percentile:36.26(Physics, Nuclear)

The hfs separation $$Deltanu$$ of $$^{126}$$Cs($$T$$$$_{1/2} = 1.63$$ m) in the 6s $$^2$$S$$_{1/2}$$ ground state was obtained in a precision measurement near zero magnetic field by means of atomic beam magnetic resonance with laser optical pumping on-line with the CERN-PSB-ISOLDE mass separator. The result, $$Deltanu = 3629.514(0.001)$$ MHz, corrects significantly a previous published value from a high-field experiment. With our result, the precision of the nuclear magnetic moment, $$mu(^{126}$$Cs)$$sim 0.776 mu_N$$, is now limited by the influence of extended nuclear structure on the hfs (the Bohr-Weisskopf effect).

Journal Articles

Completion of CS insert fabrication

Sugimoto, Makoto; Isono, Takaaki; Nunoya, Yoshihiko; Koizumi, Norikiyo; Nakajima, Hideo; Kato, Takashi; Matsukawa, Makoto; Hamada, Kazuya; Matsui, Kunihiro; Nishijima, Gen; et al.

IEEE Transactions on Applied Superconductivity, 10(1), p.564 - 567, 2000/03

 Times Cited Count:22 Percentile:71.21(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

R&D activity of SAGBO avoidance for the CS insert fabrication

Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Nakajima, Hideo; Kato, Takashi; Hamada, Kazuya; Nunoya, Yoshihiko; Matsui, Kunihiro; Sawada, Kenji*; Takahashi, Yoshikazu; et al.

IEEE Transactions on Applied Superconductivity, 9(2), p.636 - 639, 1999/06

 Times Cited Count:1 Percentile:17.18(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Development of the CS insert coil

Sugimoto, Makoto; *; Isono, Takaaki; Koizumi, Norikiyo; Nakajima, Hideo; Kato, Takashi; Nunoya, Yoshihiko; Matsui, Kunihiro; Takahashi, Yoshikazu; Ando, Toshinari; et al.

Proc. of 15th Int. Conf. on Magnet Technology (MT-15), p.409 - 412, 1997/00

no abstracts in English

Journal Articles

Design of the CS insert coil

Sugimoto, Makoto; *; Isono, Takaaki; Koizumi, Norikiyo; Nakajima, Hideo; Kato, Takashi; Nishi, Masataka; Takahashi, Yoshikazu; Ando, Toshinari; Tsuji, Hiroshi; et al.

IEEE Transactions on Magnetics, 32(4), p.2328 - 2331, 1996/07

 Times Cited Count:6 Percentile:50.93(Engineering, Electrical & Electronic)

no abstracts in English

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