Search results for: S. Kubono

Items from 1 to 20 out of 83 results

article

Study of ¹⁹F Levels with E_x = 6.7 - 7.7 MeV by the ¹⁵N+α Scattering Experiment

D. Kim, G. W. Kim, S. Y. Park, A. Kim, more

Journal of the Korean Physical Society > 2018 > 73 > 3 > 265-270

The intense γ-rays from classical novae are emitted due to the β-decay of ¹⁸F which is produced by the Hot-CNO cycle. The reaction rate of ¹⁸F(p,α)¹⁵O affects the prediction of the abundance of ¹⁸F. The main contribution to this reaction rate is from the resonances in ¹⁹Ne near and above the proton threshold. Hence, many experiments and theoretical works have been performed on the low-lying ¹⁸F+p...

article

Isomer spectroscopy of neutron-rich 168Tb103

L.A. Gurgi, P.H. Regan, P.-A. Söderström, H. Watanabe, more

Radiation Physics and Chemistry > 2017 > 140 > C > 493-496

In-flight fission of a 345MeV per nucleon ²³⁸U primary beam on a 2mm thick ⁹Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus ¹⁷⁰Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI...

article

High-precision QEC values of superallowed 0+→0+ β-emitters 46Cr, 50Fe and 54Ni

P. Zhang, X. Xu, P. Shuai, R.J. Chen, more

Physics Letters B > 2017 > 767 > C > 20-24

Short-lived ⁴⁶Cr, ⁵⁰Fe and ⁵⁴Ni were studied by isochronous mass spectrometry at the HIRFL-CSR facility in Lanzhou. The measured precision mass excesses (ME) of ⁴⁶Cr, ⁵⁰Fe and ⁵⁴Ni are −29471(11) keV, −34477(6) keV and −39278(4) keV, respectively. The superallowed 0+→0+ β-decay Q values were derived to be QEC(Cr46)=7604(11) keV, QEC(Fe50)=8150(6) keV and QEC(Ni54)=8731(4) keV. The values for ⁵⁰Fe...

article

K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

P.-A. Söderström, P.M. Walker, J. Wu, H.L. Liu, more

Physics Letters B > 2016 > 762 > C > 404-408

A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate...

article

Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

H. Watanabe, G.X. Zhang, K. Yoshida, P.M. Walker, more

Physics Letters B > 2016 > 760 > C > 641-646

The level structure of ¹⁷²Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a ²³⁸U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus ¹⁷²Ho via allowed β decays...

article

Design status of KOBRA for rare isotope production and direct measurements of radiative capture cross sections

K. Tshoo, H. Chae, J. Park, J.Y. Moon, more

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions... > 2016 > 376 > C > 188-193

KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) facility being designed at Rare Isotope Science Project in Korea will be utilized to produce rare isotope beams by employing multi-nucleon transfer reactions at about 20MeV/nucleon for studies of nuclear structure. KOBRA will also provide high suppression of beam induced background for direct measurements of radiative-capture cross sections...

article

Spallation reaction study for fission products in nuclear waste: Cross section measurements for 137Cs and 90Sr on proton and deuteron

H. Wang, H. Otsu, H. Sakurai, D.S. Ahn, more

Physics Letters B > 2016 > 754 > C > 104-108

We have studied spallation reactions for the fission products ¹³⁷Cs and ⁹⁰Sr for the purpose of nuclear waste transmutation. The spallation cross sections on the proton and deuteron were obtained in inverse kinematics for the first time using secondary beams of ¹³⁷Cs and ⁹⁰Sr at 185 MeV/nucleon at the RIKEN Radioactive Isotope Beam Factory. The target dependence has been investigated systematically,...

article

In-beam γ-ray Spectroscopy of 30P via the 28Si(3He,pγ)30P Reaction

E. Mcneice, K. Setoodehnia, B. Singh, Y. Abe, more

Nuclear Data Sheets > 2014 > 120 > Complete > 88-90

The level structure of ³⁰ P up to 8.25 MeV was investigated via in-beam γ-ray spectroscopy using the ²⁸ Si( ³ He,pγ) ³⁰ P reaction at 9 MeV at the University of Tsukuba Tandem Accelerator Complex in Japan. An energy level scheme was deduced from γ-γ coincidence measurements. 47 new transitions have been observed from the previously known states (mostly resonances),...

article

Excited states above the proton threshold in ²⁶Si

T. Komatsubara, S. Kubono, T. Hayakawa, T. Shizuma, more

The European Physical Journal A > 2014 > 50 > 9 > 1-9

The level scheme above the proton threshold in ²⁶Si is crucial for evaluating the ²⁵Al(p, γ)²⁶Si stellar reaction, which is important for understanding the astrophysical origin of the long-lived cosmic radioactivity ²⁶Al(T _1/2 = 7.17 × 10⁵ y) in the Galaxy. The excited states in ²⁶Si have been studied using an in-beam γ-ray spectroscopy technique with the ²⁴Mg(³He, nγ)²⁶Si reaction. γ-rays with energies...

article

Recent developments and research projects at the low-energy RI beam facility CRIB

H. Yamaguchi, D. Kahl, T. Nakao, Y. Wakabayashi, more

Nuclear Inst. and Methods in Physics Research, B > 2013 > 317 > Part B > 664-667

CRIB (CNS Radioactive Ion Beam separator) is a low-energy RI beam separator at the Center for Nuclear Study (CNS) of the University of Tokyo. An overview of the recent developments and status of CRIB, including a detailed summary of beam parameters, is presented. Studies on proton and α resonant scatterings, direct measurements of (α,p) reactions, and other types of measurements (β-decay lifetimes,...

article

Low-energy radioactive ion beam production of 22Mg

N.N. Duy, S. Kubono, H. Yamaguchi, D. Kahl, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 723 > Complete > 99-101

The ²² Mg nucleus plays an important role in nuclear astrophysics, specially in the ²² Mg(α,p) ²⁵ Al and proton capture ²² Mg(p,γ) ²³ Al reactions. It is believed that ²² Mg is a waiting point in the αp-process of nucleosynthesis in novae. We proposed a direct measurement of the ²² Mg+α resonance reaction in inverse kinematics using a radioactive...

article

A new low-energy radioactive beam line for nuclear astrophysics studies in China

J.J. He, S.W. Xu, P. Ma, J.S. Wang, more

Nuclear Inst. and Methods in Physics Research, A > 2012 > 680 > Complete > 43-47

A gas-target system has been newly developed and installed at a Radioactive Ion Beam Line in Lanzhou (RIBLL), which makes RIBLL capable of delivering intense, low-energy RIBs for nuclear astrophysics studies. A 1.7×10 ⁴ -pps intensity ²² Na RI beam has been achieved in a commissioning run. With further improvements, a 10 ⁵ -pps intensity of some RI beams with mass A<30 (close...

article

Quasi-elastic scattering of the proton drip line nucleus ¹⁷F on ¹²C at 60 MeV

G. L. Zhang, C. L. Zhang, H. Q. Zhang, C. J. Lin, more

The European Physical Journal A > 2012 > 48 > 5 > 1-7

The quasi-elastic scattering angular distribution of the proton drip line nucleus ¹⁷F on a ¹²C target was measured at 60 MeV. The experimental data have been compared with the theoretical analysis based onto optical model and continuum discretized coupled channels (CDCC). The couplings between breakup and elastic scattering channels, and between inelastic and elastic scattering channels resulted very...

article

Development of axial asymmetry in the neutron-rich nucleus 110Mo

H. Watanabe, K. Yamaguchi, A. Odahara, T. Sumikama, more

Physics Letters B > 2011 > 704 > 4 > 270-275

The neutron-rich nucleus ¹¹⁰ Mo has been investigated by means of γ-ray spectroscopy following the β-decay of ¹¹⁰ Nb, produced using in-flight fission of a ²³⁸ U beam at 345 MeV/nucleon at the RIBF facility. In addition to the ground-band members reported previously, spectroscopic information on the low-lying levels of the quasi-γ band built on the second 2+ state at 494 keV...

article

Simple, high-sensitive, and non-destructive beam monitor for RI beam facilities

S. Watanabe, S. Kubono, Y. Ohshiro, H. Yamaguchi, more

Nuclear Inst. and Methods in Physics Research, A > 2011 > 633 > 1 > 8-14

A non-destructive beam current monitor for measuring the AVF cyclotron beam was designed, fabricated, tested and installed into a beam line to evaluate cross-sections rate in nuclear experiment at the CRIB. The monitor comprises a metal-alloy toroidal core, a pick-up coil, a metal box, and a low noise amplifier, and has a high dynamic range of 10nA∼100μA.

article

Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer

H. Watanabe, T. Sumikama, S. Nishimura, K. Yoshinaga, more

Physics Letters B > 2011 > 696 > 3 > 186-190

The neutron-rich nuclei ¹⁰⁹ Nb and ¹⁰⁹ Zr have been populated using in-flight fission of a ²³⁸ U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in ¹⁰⁹ Nb for the first time. The low-lying levels in ¹⁰⁹ Nb have been also populated following the β-decay of ¹⁰⁹ Zr. Based on the difference in feeding...

article

Computation of Cyclotron Electromagnetic Fields

S B Vorozhtsov, A S Vorozhtsov, S Watanabe, S Kubono, more

IEEE Transactions on Nuclear Science > 2011 > 58 > 3-3 > 1181 - 1187

A highly advanced upgrade plan of the RIKEN AVF cyclotron is under way. The computation of the AVF electromagnetic fields was performed and successfully checked against the measurements. The following structural elements comprise the computer model of the machine: a beam buncher and two glazer lenses in the injection line, a magnet yoke, spiral sectors, central plugs, trim and harmonic coils, an inflector,...

chapter

Development of a Time Projection Chamber (TPC) using Gas Electron Multiplier (GEM) for use as an active target

R Akimoto, S Ota, S Michimasa, T Gunji, more

IEEE Nuclear Science Symposuim & Medical Imaging Conference > 1881 - 1884

2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC)

A Time Projection Chamber (TPC) for use as an active target has been developed. The TPC is used for nuclear experiments using unstable nuclear beam and is intended to measure a recoil nucleus in forward scattering whose energy is very small. It is designed to have two field cages and beams pass between the cages in order to decrease distortion of the electric field inside the TPC due to the ions created...

article

Study of astrophysically important states in 26Si with the p(27Si,26Si*)d reaction and the p(25Al,p)25Al elastic scattering

J. Chen, A.A. Chen, H. Schatz, S. Kubono, more

Nuclear Physics, Section A > 2010 > 834 > 1-4 > 667c-669c

The astrophysically important states in ²⁶ Si have been studied with different reactions because of their dominant contribution to the ²⁵ Al(p,γ) ²⁶ Si reaction rate at nova temperatures. We performed two different experiments to study the states of interest in ²⁶ Si, with the aim of reducing the main uncertainty in the current ²⁵ Al(p,γ) ²⁶ Si rate...

article

Trojan Horse Method: a useful tool for electron screening effect investigation

R.G. Pizzone, C. Spitaleri, S. Cherubini, M. La Cognata, more

Nuclear Physics, Section A > 2010 > 834 > 1-4 > 673c-675c

Direct measurements in the last decades have highlighted a new problem related to the lowering of the Coulomb barrier between the interacting nuclei due to the presence of the “electron screening” in the laboratory measurements. It was systematically observed that the presence of the electronic cloud around the interacting ions in measurements of nuclear reactions cross sections at astrophysical energies...

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Search results for: S. Kubono

Study of ¹⁹F Levels with E_x = 6.7 - 7.7 MeV by the ¹⁵N+α Scattering Experiment

Isomer spectroscopy of neutron-rich 168Tb103

High-precision QEC values of superallowed 0+→0+ β-emitters 46Cr, 50Fe and 54Ni

K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

Design status of KOBRA for rare isotope production and direct measurements of radiative capture cross sections

Spallation reaction study for fission products in nuclear waste: Cross section measurements for 137Cs and 90Sr on proton and deuteron

In-beam γ-ray Spectroscopy of 30P via the 28Si(3He,pγ)30P Reaction

Excited states above the proton threshold in ²⁶Si

Recent developments and research projects at the low-energy RI beam facility CRIB

Low-energy radioactive ion beam production of 22Mg

A new low-energy radioactive beam line for nuclear astrophysics studies in China

Quasi-elastic scattering of the proton drip line nucleus ¹⁷F on ¹²C at 60 MeV

Development of axial asymmetry in the neutron-rich nucleus 110Mo

Simple, high-sensitive, and non-destructive beam monitor for RI beam facilities

Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer

Computation of Cyclotron Electromagnetic Fields

Development of a Time Projection Chamber (TPC) using Gas Electron Multiplier (GEM) for use as an active target

Study of astrophysically important states in 26Si with the p(27Si,26Si*)d reaction and the p(25Al,p)25Al elastic scattering

Trojan Horse Method: a useful tool for electron screening effect investigation

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