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Journal Articles

Study of the Li($$d,xn$$) reaction for the development of accelerator-based neutron sources

Watanabe, Yukinobu*; Sadamatsu, Hiroki*; Araki, Shohei*; Nakano, Keita*; Kawase, Shoichiro*; Kin, Tadahiro*; Iwamoto, Yosuke; Satoh, Daiki; Hagiwara, Masayuki*; Yashima, Hiroshi*; et al.

EPJ Web of Conferences, 239, p.20012_1 - 20012_4, 2020/09

Accelerator-based neutron sources induced by deuteron beams are attractive for study of nuclear transmutation of radioactive waste as well as radiation damage for fusion reactor materials. In the present work, we have carried out a Double Differential cross section (DDX) measurement for Li at 200 MeV in the Research Center for Nuclear Physics (RCNP), Osaka University. A deuteron beam accelerated to 200 MeV was transported to the neutron experimental hall and focused on a thin Li target. Emitted neutrons from the target were detected by two different-size EJ301 liquid organic scintillators located at two distances of 7 m and 20 m, respectively. The neutron DDXs were measured at six angles from 0$$^{circ}$$ to 25$$^{circ}$$). The neutron detection efficiencies of the detectors were calculated by SCINFUL-QMD code. We will present the results of the present DDX measurement and compare them with theoretical model calculations with DEURACS and PHITS.

Journal Articles

How different is the core of $$^{25}$$F from $$^{24}$$O$$_{g.s.}$$ ?

Tang, T. L.*; Uesaka, Tomohiro*; Kawase, Shoichiro; Beaumel, D.*; Dozono, Masanori*; Fujii, Toshihiko*; Fukuda, Naoki*; Fukunaga, Taku*; Galindo-Uribarri. A.*; Hwang, S. H.*; et al.

Physical Review Letters, 124(21), p.212502_1 - 212502_6, 2020/05

 Times Cited Count:1 Percentile:30.13(Physics, Multidisciplinary)

The structure of a neutron-rich $$^{25}$$F nucleus is investigated by a quasifree ($$p,2p$$) knockout reaction. The sum of spectroscopic factors of $$pi 0d_{5/2}$$ orbital is found to be 1.0 $$pm$$ 0.3. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus, and the core consists of $$sim$$35% $$^{24}$$O$$_{rm g.s.}$$, and $$sim$$65% excited $$^{24}$$O. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus. The result may infer that the addition of the $$0d_{5/2}$$ proton considerably changes the neutron structure in $$^{25}$$F from that in $$^{24}$$O, which could be a possible mechanism responsible for the oxygen dripline anomaly.

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

 Times Cited Count:4 Percentile:25.43(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.

Oral presentation

Development of nuclear transmutation methods for converting LLFP into stable or short-lived nuclides, 9; Measurement of double differential (d,xn) cross sections for lithium at an incident energy of 200 MeV

Sadamatsu, Hiroki*; Watanabe, Yukinobu*; Nakano, Keita*; Kawase, Shoichiro*; Kin, Tadahiro*; Araki, Shohei*; Iwamoto, Yosuke; Satoh, Daiki; Hagiwara, Masayuki*; Yashima, Hiroshi*; et al.

no journal, , 

Recently, the deuteron incident reaction on light nuclear targets is expected to be used as accelerator-based neutron sources for nuclear transmutation of Long-Lived Fission Products (LLFP). However, there is no experimental data to validate theoretical models at an incident energy over 102 MeV. In this work, double-differential neutron production cross sections for deuteron-induced reactions on lithium at an incident energy of 200 MeV were measured at the Research Center of Nuclear Physics (RCNP), Osaka University. Measurements were carried out at six positions every five degrees between 0$$^{circ}$$ and 25$$^{circ}$$ to the beam direction, and neutron energies were determined by a time of flight method. To obtain data with wide neutron energy range, two EJ301 liquid organic scintillators of different size were set. As a result, we found that experimental neutron energy spectra have a broad energy peak structure with the strong forward emission due to the deuteron break-up reaction.

Oral presentation

Systematic measurement of double differential (d,xn) cross sections at 200 MeV

Sadamatsu, Hiroki*; Watanabe, Yukinobu*; Araki, Shohei*; Nakano, Keita*; Kawase, Shoichiro*; Kin, Tadahiro*; Iwamoto, Yosuke; Satoh, Daiki; Hagiwara, Masayuki*; Yashima, Hiroshi*; et al.

no journal, , 

The neutron source based on the high power deuteron accelerator has been considered to be used in application fields such as Long Lived Fission Product (LLFP) nuclear transmutation. For the design of accelerator and neutron source, we measured neutron production double differential cross sections for 200 MeV deuteron incident reactions on targets with wide range of atomic number in the Research Center of Nuclear Physics, Osaka University. In experiments, time-of-flight method with liquid organic scintillator EJ301 was applied to measure neutron energies. As a result, the structure of neutron cross section at forward angle had a broad peak at around 100 MeV. In this presentation, the experimental data including previous data for deuteron incident reaction with energies below 200 MeV will be compared with results calculated by codes, and we will discuss about the dependency of incident energies to neutron productions.

Oral presentation

Measurement of neutron capture cross sections of$$^{244}$$Cm and $$^{246}$$Cm using high time-resolution neutron pulses at J-PARC MLF

Kawase, Shoichiro; Kimura, Atsushi; Harada, Hideo; Iwamoto, Nobuyuki; Iwamoto, Osamu; Nakamura, Shoji; Segawa, Mariko; Toh, Yosuke

no journal, , 

no abstracts in English

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