A5079578367- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Electrostatic Discharge in Electronics
- High voltage insulation and dielectric phenomena
- Acoustic Wave Resonator Technologies
- Astro and Planetary Science
- Statistical Methods and Inference
- Neutrino Physics Research
- GaN-based semiconductor devices and materials
- Nuclear Materials and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- Medical Imaging Techniques and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Advanced Sensor and Energy Harvesting Materials
- Boron Compounds in Chemistry
- Particle accelerators and beam dynamics
- Rare-earth and actinide compounds
- Digital Radiography and Breast Imaging
- Semiconductor materials and devices
- Advanced X-ray and CT Imaging
Central Michigan University
2016-2024
RIKEN Nishina Center
2023
Michigan State University
2022
National Superconducting Cyclotron Laboratory
2022
Daresbury Laboratory
2021
Joint Institute for Nuclear Astrophysics
2020
University of Tennessee at Knoxville
2019
Theoretical models of β-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions these is a challenge due to lack currently available experimental data. In this work probabilities 33 nuclides important mass regions south and south-west 132Sn presented, 16 for first time. The measurements were performed at RIKEN using Advanced Implantation Detector Array (AIDA) BRIKEN detector array. P1n values presented constrain theoretical region,...
Abstract The β -delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using Advanced Implantation Detector Array (AIDA) BRIKEN neutron detector array. existing -decay half-life ( T 1/2 ) database was significantly increased toward more isotopes, uncertainties previously values decreased. new data not only constrain theoretical predictions half-lives probabilities, but also allow probing mechanisms...
The $\ensuremath{\beta}$-delayed one- and two-neutron emission probabilities (${P}_{1n}$ ${P}_{2n}$) of 20 neutron-rich nuclei with $N\ensuremath{\ge}82$ have been measured at the RIBF facility RIKEN Nishina Center. ${P}_{1n}$ $^{130,131}\mathrm{Ag}$, $^{133,134}\mathrm{Cd}$, $^{135,136}\mathrm{In}$, $^{138,139}\mathrm{Sn}$ were determined for first time, stringent upper limits placed on ${P}_{2n}$ nearly all cases. ($\ensuremath{\beta}2n$) was unambiguously identified in $^{133}\mathrm{Cd}$...
An ambitious program to measure decay properties, primarily β-delayed neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path rapid capture process, has been launched at RIKEN Nishina Center.We give here an overview status project.
$\ensuremath{\beta}$-delayed one-neutron and two-neutron branching ratios $({P}_{1n}$ ${P}_{2n})$ have been measured in the decay of $A=84$ to 87 Ga isotopes at Radioactive-Isotope Beam Factory (RIBF) RIKEN Nishina Center using a high-efficiency array $^{3}\mathrm{He}$ neutron counters (BRIKEN). Two-neutron emission was observed $^{84,85,87}\mathrm{Ga}$ for first time were be ${P}_{2n}=1.6(2)%,1.3(2)%$, $10.2{(28)}_{\mathrm{stat}}{(5)}_{\mathrm{sys}}%$, respectively. One-neutron ratio...
The astrophysical origin for the chemical elements between first and second $r$-process peaks is a matter of intense debate, with number nucleosynthesis processes at explosive stellar environments possibly contributing to their production. Modeling neutron-capture that would produce these requires reliable data on trends neutron separation energies neutron-rich isotopes which are highly unstable not readily accessible by experiment. This work describes application an experimental technique,...
Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for first time at Radioactive Isotope Beam Factory RIKEN Nishina Center. New millisecond isomers have identified low excitation energies, 985.3(19) keV in Tl213 and 874(5) Tl215. The measured half-lives 1.34(5) ms 3.0(3) Tl215 suggest spins parities 11/2− with single proton-hole configuration πh11/2 as leading component. They are populated via E1 transitions by decay higher-lying isomeric states...
Ferroelectrets, i.e., soft materials with electric charges deposited on the surfaces of internal voids, are well known for their potential in transducer applications and energy harvesting. Due to regular geometry optical transparency, tubular channel ferroelectrets (manufactured by laminating polymer films around a polytetrafluoroethylene template which is later removed) well-suited studying process charge deposition. Understanding how space formed will lead improvements density...
We report on the observation of a microsecond isomeric state in single-proton-hole, three-neutron-particle nucleus $^{134}\mathrm{In}$. The nuclei interest were produced by in-flight fission $^{238}\mathrm{U}$ beam at Radioactive Isotope Beam Factory RIKEN. isomer depopulates through $\ensuremath{\gamma}$ ray energy 56.7(1) keV and with half-life ${T}_{1/2}=3.5(4)\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{s}$. Based comparison shell-model calculations, we interpret as...
We measured the Zn57 β-delayed proton (βp) and γ emission at National Superconducting Cyclotron Laboratory. find a half-life of 43.6±0.2 ms, βp branching ratio (84.7±1.4)%, identify four transitions corresponding to exotic β-γ-p decay mode, second such identification in fp-shell. The p/γ was used correct for isospin mixing while determining mass via isobaric multiplet equation. Previously, it uncertain as whether rp-process flow could bypass textbook waiting point Ni56 astrophysical...
Isomeric states in the neutron-rich nuclei Zr111 [T1/2=0.10(7)μs], Nb113 [T1/2=0.7(4)μs], Mo115 [T1/2=46(3)μs] were first identified at Radioactive Ion Beam Factory (RIBF) of RIKEN by using in-flight fission and fragmentation a U238 beam an energy 345 MeV/u. This is brief report γ transitions de-exciting from isomeric half-lives measurements, which provides spectroscopy nuclear region prolate-to-oblate shape-phase transition around mass A ≈110.Received 22 October 2022Revised 28 November...
Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for first time at Radioactive Isotope Beam Factory RIKEN Nishina Center. New millisecond isomers have identified low excitation energies, 985.3(19) keV in 213Tl and 874(5) 215Tl. The measured half-lives 1.34(5) ms 3.0(3) 215Tl suggest spins parities 11/2- with single proton-hole configuration h11/2 as leading component. They are populated via E1 transitions by decay higher-lying isomeric states...
At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives ( T 1/2 ) β-delayed neutron-emission probabilities P xn ). The setup consisted BigRIPS in-flight separator for particle identification, Advanced Implantation Detector Array (AIDA) ions β detection, BRIKEN neutron counter detection. Using this arrangement, 4 new 14 1 n Furthermore, 38 2 values remeasured, decreasing uncertainties some them. In addition to...
Half-lifes ( T 1/2 ) of exotic neutron-rich isotopes Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted BigRIPS in-flight separator for ion selection identification, Advance Implantation Detector Array (AIDA) ions β detection, BRIKEN detector neutron counting. Using this setup, 4 new have been first time, 38 remeasured with improved precision in several cases. These data should help to constrain theoretical models calculations . status analysis...
β-delayed γ-neutron spectroscopy has been performed on the decay of A=84 to 87 gallium isotopes at RI-beam Factory RIKEN Nishina Center using a high-efficiency array 3He neutron counters (BRIKEN). β−2n−γ events were measured in decays all four for first time, which is direct evidence populating excited states two-neutron daughter nuclei. Detailed schemes with γ branching ratios obtained these isotopes, and emission probabilities (Pxn) updated from previous study. Hauser-Feshbach statistical...
The charge deposition process in tubular channel ferroelectrets, (i. e. voided FEP polymer films with internal electric charges) has been studied using a combination of near-UV fluorescence light emission imaging and non-destructive space measurements the laser intensity modulation method (LIMM). By galvanically isolating diode from detection circuit, LIMM sensitivity was improved by nearly one order magnitude. It shown that onset as function charging voltage precisely correlates charge....
The commissioning of a new setup for β-delayed neutron measurements was carried out successfully in November-2016, at the RIKEN Nishina Center Japan. β-decay half-lives and Pn branching ratios several isotopes 78Ni region were measured. Details experimental first results are given.