scholarly journals Direct measurements and detection techniques with low-energy RIBs

2018 ◽  
Vol 184 ◽  
pp. 01017
Author(s):  
H. Yamaguchi ◽  
S. Hayakawa ◽  
L. Yang ◽  
H. Shimizu ◽  
D. Kahl
Keyword(s):  
Resonant Scattering ◽  
Reaction Rates ◽  
Thick Target ◽  
Low Energy ◽  
Radioactive Isotopes ◽  
Detection Techniques ◽  
Technical Developments ◽  
Production Measurement ◽  
Ri Beam ◽  
The University

Astrophysical reactions involving radioactive isotopes (RI) are of importance for the stellar energy generation and nucleosynthesis especially in high-temperature astrophysical sites, such as X-ray bursts, core-collapse supernovae, and supermassive metalpoor stars. In spite of the essential diffculties in the experimental evaluation of those reaction rates, there are several successful approaches to study them, owing to the recent technical developments in the beam production, measurement method, and detectors. Among them, the measurements of α resonant scattering and (α, p) reactions using the thick-target method in inverse kinematics are discussed. The experiments at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study (CNS), the University of Tokyo, are introduced as examples for such studies.

scholarly journals Nuclear astrophysics projects at the low-energy RI beam separator CRIB

2017 ◽  
Vol 165 ◽  
pp. 01056
Author(s):  
H. Yamaguchi ◽  
D. Kahl ◽  
S. Hayakawa ◽  
L. Yang ◽  
H. Shimizu ◽  
...  
Keyword(s):  
Nuclear Astrophysics ◽  
Low Energy ◽  
Ri Beam

An Image Tube Scintillation Camera for Use with Radioactive Isotopes Emitting Low-Energy Photons

Radiology ◽  
1966 ◽  
Vol 86 (3) ◽  
pp. 463-469 ◽  
Author(s):  
Michel M. Ter-Pogossian ◽  
Wilfrid F. Niklas ◽  
Jack Ball ◽  
John O. Eichling
Keyword(s):  
Low Energy ◽  
Radioactive Isotopes ◽  
Scintillation Camera ◽  
Image Tube

scholarly journals Low-Energy Molecular Collision Processes in Space

1987 ◽  
Vol 120 ◽  
pp. 31-41
Author(s):  
Kazuo Takayanagi
Keyword(s):  
Cross Sections ◽  
Reaction Rates ◽  
Intermolecular Forces ◽  
Low Energy ◽  
Collision System ◽  
Molecular Collision ◽  
Section Data ◽  
Collision Partner ◽  
Collision Processes ◽  
Chemical Reaction Rates

Among the low-energy nonreactive molecular collisions, the rotational and vibrational transitions are the most important inelastic processes. the collision partner is an electron, an ion, or a neutral particle. Depending on the process and the collision system concerned, the magnitude and the energy dependence of the relevant cross sections are widely different. the present status of our knowledge is briefly summarized and some sample cross section data for H2and CO are shown. Useful relations among the rotational cross sections are indicated. the importance of the long-range intermolecular forces in determining some chemical reaction rates is also pointed out.

CRIB: The Low Energy In-Flight RI Beam Separator

2020 ◽  
Vol 30 (2) ◽  
pp. 21-27
Author(s):  
Hidetoshi Yamaguchi ◽  
Daid Kahl ◽  
Shigeru Kubono
Keyword(s):  
Low Energy ◽  
Ri Beam

Thick-target measurements and astrophysical thermonuclear reaction rates: Proton-induced reactions

1979 ◽  
Vol 23 (2) ◽  
pp. 177-194 ◽  
Author(s):  
N.A. Roughton ◽  
M.R. Fritts ◽  
R.J. Peterson ◽  
C.S. Zaidins ◽  
C.J. Hansen
Keyword(s):  
Reaction Rates ◽  
Thick Target ◽  
Thermonuclear Reaction ◽  
Proton Induced Reactions

scholarly journals Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

2019 ◽  
Vol 2019 (11) ◽  
Author(s):  
T Sonoda ◽  
I Katayama ◽  
M Wada ◽  
H Iimura ◽  
V Sonnenschein ◽  
...  
Keyword(s):  
High Energy ◽  
Ion Source ◽  
Low Energy ◽  
Laser Ion Source ◽  
Gas Cell ◽  
Beam Production ◽  
Expected Benefits ◽  
Conceptual Study ◽  
Ri Beam

Abstract An in-flight separator performs the important role of separating a single specific radioactive isotope (RI) beam from the thousands of RI beams produced by in-flight fission as well as projectile fragmentation. However, when looking at ``separation'' from a different viewpoint, more than 99% of simultaneously produced RI beams are just eliminated in the focal plane slits or elsewhere in the separator. In order to enhance the effective usability of the RIKEN in-flight separator BigRIPS, we have been developing an innovative method: parasitic laser ion source (PALIS), which implements parasitic low-energy RI beam production by saving eliminated RI beams during BigRIPS experiments. In this paper, we present the expected benefits and feasibility for the PALIS concept and the results of the first stopping examination for high-energy RI beams in the gas cell.

scholarly journals Multi-Slot BLE Raw Database for Accurate Positioning in Mixed Indoor/Outdoor Environments

Data ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 67 ◽  
Author(s):  
Fernando J. Aranda ◽  
Felipe Parralejo ◽  
Fernando J. Álvarez ◽  
Joaquín Torres-Sospedra
Keyword(s):  
Signal Strength ◽  
Received Signal Strength ◽  
Low Energy ◽  
Location Based Services ◽  
Positioning System ◽  
Positioning Accuracy ◽  
Bluetooth Low Energy ◽  
Outdoor Environments ◽  
The University

The technologies and sensors embedded in smartphones have contributed to the spread of disruptive applications built on top of Location Based Services (LBSs). Among them, Bluetooth Low Energy (BLE) has been widely adopted for proximity and localization, as it is a simple but efficient positioning technology. This article presents a database of received signal strength measurements (RSSIs) on BLE signals in a real positioning system. The system was deployed on two buildings belonging to the campus of the University of Extremadura in Badajoz. the database is divided into three different deployments, changing in each of them the number of measurement points and the configuration of the BLE beacons. the beacons used in this work can broadcast up to six emission slots simultaneously. Fingerprinting positioning experiments are presented in this work using multiple slots, improving positioning accuracy when compared with the traditional single slot approach.

PRELIMINARY MEASUREMENTS OF THE LOW ENERGY DETECTION EFFICIENCY OF A Si(Li) DETECTOR FOR PIXE APPLICATIONS

2002 ◽  
Vol 12 (03n04) ◽  
pp. 71-78
Author(s):  
M. RODRIGUEZ ◽  
T. YONEZAWA ◽  
K. ISHII ◽  
S. MATSUYAMA ◽  
H. YAMAZAKI ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Energy Detection ◽  
Thick Target ◽  
Incident Electron ◽  
Thin Layers ◽  
Low Energy ◽  
Dead Layer ◽  
Bremsstrahlung Spectrum ◽  
Significant Discrepancy ◽  
The One

The low energy detection efficiency of a Si ( Li ) detector is measured in this work. The continuous bremsstrahlung spectrum produced by bombarding a thick C target with an electron beam is used as the standard radiation source. The bremsstrahlung spectrum for a thick C target is calculated from tabulated data assuming the thick target to consist of an array of thin layers applying the respective attenuation correction for photons emitted in each thin layer. The bremsstrahlung spectra for three incident electron energies (10, 12 and 15 keV) are measured and compared with the calculated ones. The relative efficiency is obtained and compared with a calculated efficiency based on the detector specifications. The efficiency measured for those three incident electron energies on the thick target are consistent with each other. The region limited by 2 keV < k < 6 keV , where k is the X-ray energy, exhibits a significant discrepancy between measurements and calculated efficiencies. A possible explanation of the observed discrepancy is that the real thickness of the Si dead layer is thinner than the one reported by the manufacturer. The obtained efficiency values are valid within the range 0.8 keV < k < 12.5 keV .

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