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Journal Articles

Quasifree neutron knockout reaction reveals a small -Orbital component in the Borromean nucleus $^{17}$ B

Yang, Z. H.*; Kubota, Yuki*; Corsi, A.*; Yoshida, Kazuki; Sun, X.-X.*; Li, J. G.*; Kimura, Masaaki*; Michel, N.*; Ogata, Kazuyuki*; Yuan, C. X.*; et al.

Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02

AA2020-0819.pdf:1.29MB

https://doi.org/10.1103/PhysRevLett.126.082501

Times Cited Count：45 Percentile：96.69(Physics, Multidisciplinary)

A quasifree (,) experiment was performed to study the structure of the Borromean nucleus $^{17}$ B, which had long been considered to have a neutron halo. By analyzing the momentum distributions and exclusive cross sections, we obtained the spectroscopic factors for $1s_{1/2}$ and $0d_{5/2}$ orbitals, and a surprisingly small percentage of 9(2)% was determined for $1s_{1/2}$ . Our finding of such a small $1s_{1/2}$ component and the halo features reported in prior experiments can be explained by the deformed relativistic Hartree-Bogoliubov theory in continuum, revealing a definite but not dominant neutron halo in $^{17}$ B. The present work gives the smallest - or -orbital component among known nuclei exhibiting halo features and implies that the dominant occupation of or orbitals is not a prerequisite for the occurrence of a neutron halo.

Journal Articles

Enhancement of element production by incomplete fusion reaction with weakly bound deuteron

Wang, H.*; Otsu, Hideaki*; Chiga, Nobuyuki*; Kawase, Shoichiro*; Takeuchi, Satoshi*; Sumikama, Toshiyuki*; Koyama, Shumpei*; Sakurai, Hiroyoshi*; Watanabe, Yukinobu*; Nakayama, Shinsuke; et al.

Communications Physics (Internet), 2(1), p.78_1 - 78_6, 2019/07

https://doi.org/10.1038/s42005-019-0165-1

Times Cited Count：8 Percentile：55.71(Physics, Multidisciplinary)

Searching for effective pathways for the production of proton- and neutron-rich isotopes through an optimal combination of reaction mechanism and energy is one of the main driving forces behind experimental and theoretical nuclear reaction studies as well as for practical applications in nuclear transmutation of radioactive waste. We report on a study on incomplete fusion induced by deuteron, which contains one proton and one neutron with a weak binding energy and is easily broken up. This reaction study was achieved by measuring directly the cross sections for both proton and deuteron for $^{107}$ Pd at 50 MeV/u via inverse kinematics technique. The results provide direct experimental evidence for the onset of a cross-section enhancement at high energy, indicating the potential of incomplete fusion induced by loosely-bound nuclei for creating proton-rich isotopes and nuclear transmutation of radioactive waste.

Journal Articles

Feasibility of D $^{3}$ He/ST fusion power reactor

Shimotono, Hidetoshi*; Nishio, Satoshi; Kondo, Shunsuke*

Fusion Engineering and Design, 69(1-4), p.675 - 681, 2003/09

https://doi.org/10.1016/S0920-3796(03)00210-2

Times Cited Count：4 Percentile：31.59(Nuclear Science & Technology)

The prospect of D $^{3}$ He/ST fusion power reactor have been explored and the design window of the reactor has been specified. The high temperature super-conductor (Bi2212/Ag/Ag) is chosen for TF coils; the operation temperature is 20 K; the conductor current density is about 110 MA/m $^{2}$ at 18-23 T. System analyses have indicated that the design window (which satisfies the constraints HH $_{y2}$ 2, $_{e}$ / $_{GW}$ 1.1, and TF800MPa) is amall and require 1.55, $_{t}$ 40%, and the first wall thermal losd $_{w}$ 1.25 MW/m $^{2}$ to ensure the functional and structural reliabilities of the center column (i.e. TF coil system). The plasma current is 75-85 MA.