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Journal Articles

Repetition Rate Multiplication: RRM, an advanced measuring method planed for the backscattering instrument, ${it DNA}$ at the MLF, J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Sato, Taku*; Tsukushi, Itaru*; et al.

Journal of the Physical Society of Japan, 80(Suppl.B), p.SB007_1 - SB007_4, 2011/12

 Times Cited Count:5 Percentile:40.61(Physics, Multidisciplinary)

Journal Articles

Study of the analyzer crystals for use in the near-backscattering spectrometer DNA at J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*; Metoki, Naoto; Nakajima, Kenji; Arai, Masatoshi

Nuclear Instruments and Methods in Physics Research A, 600(1), p.91 - 93, 2009/02

 Times Cited Count:8 Percentile:48.45(Instruments & Instrumentation)

A time-of-flight crystal-analyzer neutron inelastic scattering spectrometer DNA has been proposed to construct in the MLF of J-PARC. DNA has been designed to have three crystal analyzers, PG(002), Ge(311) and Si(111) at near-backscattering configurations to study dynamics of biomolecules and proteins in wide energy and momentum transfer ranges. In order to develop the Ge(311) analyzer-crystals we have performed neutron beam experiments to check rocking curves on two candidates, i.e., (a) thick hot-pressed wafers and (b) stacked number of thin as-cut wafers, at the MUSASI port, which is a triple-axis instrument, located on the T2 beam line at the JRR-3M guide hall, Tokai, Japan.

Journal Articles

Instrumental design of indirect geometry crystal analyzer spectrometer; DNA at J-PARC

Shibata, Kaoru; Takahashi, Nobuaki; Nakagawa, Hiroshi; Fujiwara, Satoru; Kataoka, Mikio; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*

Nihon Kessho Gakkai-Shi, 50(1), p.46 - 50, 2008/02

The instrumental design of an indirect geometry crystal analyzer spectrometer: DNA which is scheduled to be constructed in the Material and Life Science experimental Facility (MLF) at J-PARC, is reported in this article. This spectrometer is mainly aimed at searching for the high quality inelastic scattering spectra with only several mg order biomolecular sample in the plenty of wide range of energy and momentum transfers.

Journal Articles

Hydration-coupled protein boson peak measured by incoherent neutron scattering

Nakagawa, Hiroshi; Kataoka, Mikio*; Jochi, Yasumasa*; Kitao, Akio*; Shibata, Kaoru; Tokuhisa, Atsushi*; Tsukushi, Itaru*; Go, Nobuhiro

Physica B; Condensed Matter, 385-386(2), p.871 - 873, 2006/11

 Times Cited Count:13 Percentile:53.21(Physics, Condensed Matter)

The boson peak of a protein was examined in relation to hydration using staphylococcal nuclease. Although the boson peak is commonly observed in synthetic polymers, glassy materials and amorphous materials, the origin of the boson peak is not fully understood. The motions that contribute to the peak are harmonic vibrations. Upon hydration the peak frequency shifts to a higher frequency and the effective force constant of the vibration increases at low temperatures, suggesting that the protein energy surface is modified. Hydration of the protein leads to a more rugged surface and the vibrational motions are trapped within the local minimum at cryogenic temperatures. The origin of the protein boson peak may be related to this rugged energy surface.

Journal Articles

Thermal neutron spin-echo studies on dynamics of a glass-forming polymer in a high ${it Q}$ range

Kanaya, Toshiji*; Kakurai, Kazuhisa; Tsukushi, Itaru*; Inoue, Rintaro*; Watanabe, Hiroshi*; Nishi, Masakazu*; Nakajima, Kenji; Takemura, Kazuhiro*; Furuya, Hidemine*

Journal of the Physical Society of Japan, 74(12), p.3236 - 3240, 2005/12

 Times Cited Count:5 Percentile:37.96(Physics, Multidisciplinary)

We performed thermal neutron spin echo measurements on a glass-forming polymer, deuterated polybutadiene (-[CD$$_{2}$$-CD=CD-CD$$_{2}$$]$$_{n}$$-; PB-d$$_{6}$$), in a high ${it Q}$ range up to 3.5$AA $^{-1}$$ covering the first and second peaks of the structure factor S(${it Q}$), and evaluated the decay rate $$Gamma$$(${it Q}$) of the coherent intermediate scattering function as a function of ${it Q}$. In contrast to the previous experimental findings on the first peak of S(${it Q}$) at ${it Q}$ = 1.5$AA $^{-1}$$, no "de Gennes" type narrowing was observed on the second peak at ${it Q}$ = 2.9$AA $^{-1}$$. This novel finding indicates that the narrowing is hidden by the distinct motions of the soft -CD$$_{2}$$-CD$$_{2}$$- and =CD-CD$$_{2}$$- units and the self-motions of the rigid and soft units in the ${it Q}$ range around the second peak.

Oral presentation

Study of the instrumental detailed design on near-backscattering spectrometers DNA

Shibata, Kaoru; Takahashi, Nobuaki; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

no abstracts in English

Oral presentation

Study of the configuration and performance of crystal analyzer on near-backscattering TOF spectrometer DNA

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Metoki, Naoto; Mamontov, E.*; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

no abstracts in English

Oral presentation

Potential of 1 micro-eV energy resolution of the Si-analyzer backscattering spectrometer DNA at the spallation neutron source J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

A time-of-flight Si-analyzer backscattering spectrometer (BSS) DNA is proposed for construction in the Materials and Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC) located in Tokai, Ibaraki, Japan. Four crystal analyzer sets, namely Si(111), Si(311), PG(002) and Ge(311) had been planned to be mounted on it in near-backscattering configurations in two evacuated tanks in order to cover wide energy and momentum transfer ranges that suit research on the dynamics of bio-molecules and proteins. After extensive discussion with instrument scientists of BSSs as well as biophysicists in the committee the highest energy resolution option provided by the Si analyzer came to the highest priority. Therefore the design of the DNA has been rather simplified. Si(111) and Si(311) analyzers will be mounted in a vacuum vessel putting at 43 m away from a coupled moderator to enjoy the highest peak intensity around several meV, which is the elastic energies of the Si analyzers, among three moderators of JSNS, namely the coupled, a decoupled and a decoupled-poison. Because the pulse time-width of the coupled moderator is the widest of the three, it is designed to utilize a pulse-shaping device, which is high speed counter rotating disc choppers, on the beamline staying as far away from the sample position as possible to narrow the time-width. In this paper we will present the conceptual design and the expected performance of the pulse-shape short-flight-length BSS DNA. The obtainable performance will be compared with BSSs at reactor sources as well as a decoupled-poisoned-moderator-source long-flight-length BSS at a spallation neutron source.

Oral presentation

The Study of thermal diffuse scattering measured by pulsed neutron diffraction

Shibata, Kaoru; Takahashi, Nobuaki; Tsukushi, Itaru*; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

In this presentation, we will report the experimental results of thermal diffuse scattering (TDS) which occurs close to the Bragg reflections in time-of-flight neutron diffraction. We measured the thermal diffuse scatterings around some analyzer crystals Bragg peaks; pyrolitic graphite PG(002), perfect silicon Si(111) and natural green mica: Mica(006). Those experiments were performed on the diffraction counter bank of LAM-80ET: the indirect geometry crystal analyzer spectrometer installed at KENS; the pulsed neutron source in KEK, Japan, using scattering angles around 2th 160. deg.

Oral presentation

Study of thermal diffuse scattering from single crystal in near-backscattering TOF neutron diffraction

Shibata, Kaoru; Takahashi, Nobuaki; Tsukushi, Itaru*; Kawakita, Yukinobu*; Sato, Taku*; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

We will report the experimental results of thermal diffuse scattering (TDS) which occurs close to the Bragg reflections in time-of-flight neutron diffraction. We measured the thermal diffuse scatterings around some analyzer crystals Bragg peaks; pyrolitic graphite PG(002), perfect silicon Si(111) and natural green mica: Mica(006).

Oral presentation

Instrumental design and expected performance of the near backscattering Si crystal analyzer spectrometer DNA at the J-PARC pulsed neutron source

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

In the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC, we are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF.

Oral presentation

Si backscattering spectrometer at the pulsed neutron source of J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

Oral presentation

Study of the RRM; Repetition Rate Multiplication technique for the Si-BSS DNA at the spallation neutron source of J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*

no journal, , 

no abstracts in English

Oral presentation

The Present status of the near backscattering Si crystal analyzer spectrometer DNA at the J-PARC pulsed neutron source

Shibata, Kaoru; Takahashi, Nobuaki; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*

no journal, , 

In the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC, we are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF. We will report the present status of the specification of spectrometer and the construction plan.

Oral presentation

The Study of optical specification for the near backscattering Si crystal analyzer spectrometer

Shibata, Kaoru; Takahashi, Nobuaki; Nakajima, Kenji; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; Mutka, H.*; et al.

no journal, , 

We are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA at the Material and Life Science Facility (MLF), J-PARC. The optical specification of DNA is as follows. In the center of the vacuum chamber, a sample position is located at 42 m away form the coupled moderator. The analyzer banks of Si(111) and Si(311) single crystal wafers which are pasted on the spherical surface, are mounted at the right and left side each in the vacuum chamber. The Bragg angle of those analyzer crystals are about 87.5 deg and the distance between the sample position and the analyzer crystal is about 2.3 m. The analyzed neutron beams are detected by the $$^{3}$$Hee gas position sensitive detector located at around the sample position. Then the expected energy resolution and the dynamic range of the Si(111) crystal analyzer are about 1 micro-eV and $$pm$$ 40 micro-eV, respectively. We will report the optical principle and specification of DNA spectrometer.

Oral presentation

Chopper system of DNA; A Si backscattering spectrometer at pulsed neutron source of J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

The Specification and construction schedule of the near backscattering Si crystal analyzer spectrometer, 2

Shibata, Kaoru; Takahashi, Nobuaki; Nakajima, Kenji; Kambara, Wataru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

RRM (Repetition Rate Multiplication) of the biomolecular neutron inelastic spectrometer DNA

Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

The Specification and construction schedule of the near backscattering Si crystal analyzer spectrometer DNA, 3

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Aizawa, Kazuya; Soyama, Kazuhiko; Oikawa, Kenichi; Yoshida, Noboru; et al.

no journal, , 

A Si-crystal analyzer backscattering spectrometer DNA is planned to be installed at the pulsed neutron source of the Material and Life Science Facility (MLF), J-PARC, and the construction has partially begun in the summer of 2010. The field of expected scientific research on the DNA spectrometer is very wide including the soft matter dynamics, the bio-molecular dynamics, the chemical molecular dynamics, the characterizations of the functional materials and the spin dynamics in the magnetism.

Oral presentation

The Construction schedule of the near backscattering Si crystal analyzer spectrometer

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; Nakatani, Takeshi; Aizawa, Kazuya; Soyama, Kazuhiko; Oikawa, Kenichi; et al.

no journal, , 

We are beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA in the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF. The field of expected scientific research on the DNA spectrometer is very wide including the soft matter dynamics, the bio-molecular dynamics, the chemical molecular dynamics, the characterizations of the functional materials and the spin dynamics in the magnetism. We will report the present status of the construction schedule on DNA.

Oral presentation

High-resolution neutron inelastic scattering measurements prospected by DNA spectrometer

Takahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Sato, Taku*; Tsukushi, Itaru*; et al.

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)