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Topic guide — what do these subjects study?
These browsing tags overlap: a paper can belong to several topics. Counts show this bibliography, not the number of papers in the whole field. A topic with zero papers still has a learning explanation; it does not imply a publication here. Use the topic filter with year, author role and search. “Mass spectrometry” is the usual term for measuring masses; optical spectroscopy measures spectra. Topic explanations: English.
Existing research themes
N = Z nuclei / MASSPASS (4)
Precision masses near equal neutron and proton numbers probe shell evolution and astrophysical reaction paths.
Typical observables: See the linked research programme and papers.
Q values for neutrino physics (11)
Decay-energy measurements assess candidates for direct neutrino-mass experiments.
Typical observables: See the linked research programme and papers.
Atomic masses and isotope shifts (1)
Accurate atomic masses support isotope-shift analysis and the separation of mass and nuclear-size effects.
Typical observables: See the linked research programme and papers.
Storage rings, MR-TOF and MCP detectors (7)
Ion manipulation, precision timing and position detection enable rare-isotope mass measurements.
Typical observables: See the linked research programme and papers.
Mass methods and beams
Mass spectrometry and ion-beam applications (71)
Measures and separates ions by mass-to-charge ratio. Precision masses and clean isotope beams support decay-energy, nuclear-structure and astrophysics studies.
Typical observables: Atomic masses, Q values, beam purity and emittance.
Mass-spectrometry innovations in heavy-ion research (27)
Develops Penning traps, MR-TOF instruments, storage rings, timing detectors and ion optics for rare isotopes. Read resolving power, accuracy and efficiency separately: a narrow peak alone does not establish an accurate mass.
Typical observables: Resolving power, calibration, timing, transmission and systematic uncertainty.
Laser spectroscopy and ion sources (4)
Laser spectroscopy uses isotope shifts and hyperfine structure to determine radii, spins and moments. Ion sources create and prepare the required beam; a laser-ablation source is not automatically a laser-spectroscopy measurement.
Typical observables: Isotope shifts, hyperfine constants, charge radii, beam yield and purity.
Nuclear structure
Shape coexistence and nuclear structure (0)
Different intrinsic nuclear shapes can produce low-lying states in the same nucleus. Energies, electromagnetic transitions and radii help distinguish coexistence from a gradual change in deformation; a mass trend alone is not proof.
Typical observables: Low-lying 0+ states, E0/E2 strengths, charge radii and configuration mixing.
Nuclear structure and isotope evolution (25)
Follows how shell structure, pairing and deformation change along isotope or isotone chains. Here isotope evolution means changes with proton or neutron number, rather than motion of isotopes through a material.
Typical observables: Separation energies, shell gaps, pairing indicators, radii and isomers.
Multi-neutron systems (4)
Investigates correlations and possible resonances in systems made only of neutrons. A short-lived resonance-like structure must be distinguished from a bound nucleus and from final-state interaction effects.
Typical observables: Missing-mass spectra, relative energies, widths and reaction-model dependence.
Dipole resonances and strength distributions (1)
Examines dipole excitations and how their strength is distributed in energy. Electric dipole motion can reveal collective response and weakly bound neutron dynamics; a low-energy peak requires interpretation before being called a distinct resonance.
Typical observables: E1 strength, excitation energy, decay channels and polarizability.
Octupole deformation and correlations (1)
Reflection-asymmetric, often pear-like shapes involve octupole degrees of freedom. Static deformation and octupole vibrations are different possibilities, tested through spectra, parity partners and electric-octupole transition strengths.
Typical observables: Parity doublets, E3 strengths, collective bands and deformation indicators.
Nuclear structure and isospin symmetry (3)
Compares mirror nuclei and isobaric multiplets by exchanging proton and neutron roles. Coulomb effects and other charge-dependent interactions break ideal isospin symmetry, affecting displacement energies and precision weak-decay tests.
Typical observables: Multiplet masses, Coulomb displacement energies, IMME coefficients and decay corrections.
Neutron skins and nuclear symmetry energy (0)
The neutron skin is the difference between neutron and proton root-mean-square radii. Its relation to the density dependence of symmetry energy is model-dependent; charge radii alone do not directly measure a neutron skin.
Typical observables: Neutron/proton radii, parity-violating scattering, dipole polarizability and equation-of-state constraints.
Decay and symmetries
Beta decay and fundamental symmetries (2)
Uses decay rates, spectra and angular correlations to test the weak interaction. Searches for time-reversal violation or non-standard couplings need controlled nuclear and detector effects; an ordinary beta-decay measurement is not itself evidence of symmetry violation.
Typical observables: Correlation coefficients, Vud, spectral shapes and systematic corrections.
Neutrino masses and double beta decay (13)
Direct beta or electron-capture endpoints probe the neutrino mass scale through decay kinematics. Double-beta studies also need Q values and nuclear matrix elements; neutrinoless decay, if observed, would test lepton-number conservation. These methods make different assumptions.
Typical observables: Q values, endpoint spectra, phase-space factors, matrix elements and backgrounds.
Nuclear structure and isotope decay (29)
Uses radioactive decay to identify levels, spins, transition strengths and long-lived isomers. Decay energies and branching ratios connect the mass surface to the structure of parent and daughter nuclei.
Typical observables: Half-lives, Q values, branching ratios, level schemes and beta strength.
Nuclear astrophysics
Nucleosynthesis and the chemical evolution of stars (7)
Links nuclear reaction and decay networks to the abundance of elements in stars and ejecta. Masses and lifetimes constrain pathways, while stellar evolution and mixing determine how products reach later generations of stars.
Typical observables: Abundances, reaction flows, masses, half-lives and astrophysical conditions.
Nuclear reactions and nucleosynthesis in novae (0)
Classical novae are thermonuclear outbursts on accreting white dwarfs. Resonances, proton captures and beta decays determine reaction rates and the isotopes ejected; a supernova or Big-Bang study is not automatically a nova study.
Typical observables: Resonance energies and strengths, temperature-dependent rates and ejecta yields.
Astrophysical reactions and nuclear dynamics (8)
Connects laboratory cross sections and resonances with reaction rates in astrophysical plasmas. Reaction mechanisms, target states and uncertainties matter when translating a beam experiment into a stellar rate.
Typical observables: Cross sections, resonance strengths, reaction rates and network sensitivity.
Heavy nuclei and reactions
Superheavy-element synthesis and decay (0)
Creates the heaviest nuclei in fusion reactions and identifies them through decay chains. Production probabilities compete with fission, and shell effects influence survival. Transfer reactions on heavy targets do not automatically imply superheavy-element synthesis.
Typical observables: Evaporation-residue cross sections, alpha-decay chains and fission lifetimes.
Fission-fragment dynamics and energy distributions (2)
Studies how a fissioning nucleus divides mass, charge, energy and angular momentum between fragments. Fragment yields and isomer populations constrain the roles of shell structure, excitation and the scission process.
Typical observables: Mass/charge yields, total kinetic energy, spin distributions and isomeric ratios.
Detector technologies
Superconducting calorimeters for precision detection (0)
Measures deposited energy as a tiny temperature rise at cryogenic temperatures. Transition-edge sensors use the steep resistance change near a superconducting transition; energy resolution, response time and background must be assessed together.
Typical observables: Energy resolution, thermal response, pile-up, calibration and noise.
Resistive plate chambers in particle detection (0)
Gas detectors with resistive electrodes amplify ionization signals in a strong electric field. They provide fast timing and triggering in particle experiments; they are a different technology from MCP detectors.
Typical observables: Efficiency, time resolution, rate capability, gas mixture and ageing.
査読付き論文 100 編以上。全リスト： ORCID · INSPIRE-HEP · Scopus · Web of Science · Lens · Frontiers Loop · SciProfiles · 大学プロフィール · MASSPASS プロジェクト
主要論文 #
24 件の文献記録
- , Precise determination of electron-capture Q value of ¹¹³Sn decay related to electron neutrino mass measurements, Phys. Rev. C 114, 035501 (2026) · arXiv:2604.03410 — QEC = 1039.25(19) keV
- , High-precision mass and β⁻ decay Q-value measurement of ¹²⁹Sb and its isomer, Eur. Phys. J. A 62, 123 (2026)
- , High-precision direct decay energy measurements of the electron-capture decay of ⁹⁷Tc, Phys. Rev. C 112, 035501 (2025) · arXiv:2502.04490 — QEC = 324.82(21) keV
- , Overview of high-performance timing and position-sensitive MCP detectors utilizing secondary electron emission for mass measurements of exotic nuclei at nuclear physics facilities, Sensors 24, 7261 (2024) — review
- , High-precision measurements of the atomic mass and electron-capture decay Q value of ⁹⁵Tc, Phys. Lett. B 859, 139094 (2024) · arXiv:2406.05273
- , High-precision measurement of the atomic mass of ⁸⁴Sr and implications to isotope shift studies, Eur. Phys. J. A 60, 147 (2024) · arXiv:2404.02025
- , Direct high-precision measurement of the mass difference of ⁷⁷As–⁷⁷Se related to neutrino mass determination, Eur. Phys. J. A 60, 104 (2024) · arXiv:2401.15242
- , High-precision mass measurements of neutron-deficient silver isotopes probe the robustness of the N = 50 shell closure, Phys. Rev. Lett. 133, 132503 (2024) · arXiv:2401.07976
- , β⁻ decay Q-value measurement of ¹³⁶Cs and its implications for neutrino studies, Phys. Rev. C 108, 045502 (2023) · arXiv:2306.04604
- , Direct determination of the atomic mass difference of the pairs ⁷⁶As–⁷⁶Se and ¹⁵⁵Tb–¹⁵⁵Gd rules out ⁷⁶As and ¹⁵⁵Tb as possible candidates for electron (anti)neutrino mass measurements, Phys. Rev. C 106, 015502 (2022) · arXiv:2202.07656
- , High-precision electron-capture Q value measurement of ¹¹¹In for electron-neutrino mass determination, Phys. Lett. B 832, 137226 (2022) · arXiv:2201.12573
- , Observation of an ultralow-Q-value electron-capture channel decaying to ⁷⁵As via a high-precision mass measurement, Phys. Rev. C 106, 015501 (2022) · arXiv:2203.00457
- , High-precision measurement of a low Q value for allowed β⁻ decay of ¹³¹I related to neutrino mass determination, Phys. Lett. B 830, 137135 (2022)
- , ¹⁵⁹Dy electron-capture: a new candidate for neutrino mass determination, Phys. Rev. Lett. 127, 272301 (2021) · arXiv:2106.06626
- , Development of a large-area timing and position-sensitive foil-MCP detector for mass measurements at the Rare-RI Ring in RIKEN, arXiv preprint (2021) · arXiv:2106.08264
- , Direct measurement of the mass difference of ⁷²As–⁷²Ge rules out ⁷²As as a promising β-decay candidate to determine the neutrino mass, Phys. Rev. C 103, 065502 (2021) · arXiv:2103.08729
- , Development of mirror-type MCP detectors for mass measurements at the Rare-RI Ring, JPS Conf. Proc. 35, 011023 (2021)
- , MCP with delay-line anode used for position sensitive detector at Rare RI Ring, JPS Conf. Proc. 35, 011025 (2021)
- , Scheme of high-resolution identification and selection of secondary ions for mass measurements with the Rare-RI Ring, Hyperfine Interact. 240, 92 (2019)
- , Study of mass-measurement method for N = Z nuclei with isochronous mass spectrometry, Nucl. Phys. Rev. 36, 294 (2019)
- , Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF, Nucl. Sci. Tech. 30, 152 (2019) · arXiv:2105.14551
- , Timing performance of a mirror-type MCP detector for mass measurements at the Rare RI Ring, RIKEN Accel. Prog. Rep. 51, 152 (2018)
- , Simulation and design of a large-area position-sensitive TOF MCP detector at the Rare RI Ring, RIKEN Accel. Prog. Rep. 50, 187 (2017)
- , Online results for the injection ion optics of the Rare RI Ring, RIKEN Accel. Prog. Rep. 49, 180 (2016)
共同研究のハイライト #
6 件の文献記録
- , Nuclear charge radius of ²⁶ᵐAl and its implication for Vud in the quark-mixing matrix, Phys. Rev. Lett. 131, 222502 (2023)
- , Observation of a correlated free four-neutron system, Nature 606, 678 (2022)
- , Impact of nuclear deformation and pairing on the charge radii of palladium isotopes, Phys. Rev. Lett. 128, 152501 (2022)
- , Measuring the β-decay properties of neutron-rich exotic Pm, Sm, Eu, and Gd isotopes to constrain the nucleosynthesis yields in the rare-earth region, Astrophys. J. 936, 107 (2022)
- , First application of mass measurements with the Rare-RI Ring reveals the solar r-process abundance trend at A = 122 and A = 123, Phys. Rev. Lett. 128, 152701 (2022)
- , Constraining the primordial lithium abundance: new cross section measurement of the ⁷Be+n reactions updates the total ⁷Be destruction rate, Astrophys. J. Lett. 915, L13 (2021)
その他の共著論文 #
70 件の文献記録
2026
- , A pathway towards decentralized studies of radioactive post-lead elements and their applications in BSM physics, Nat. Commun. (2026)
- , Dipole strength distribution of ⁸He and decay characteristics, Phys. Rev. Lett. 136, 172501 (2026)
- , Direct mass measurement of ⁹¹Rh and ⁸⁹Ru and mid-shell trend of the one-proton separation energies for N = Z + 1 nuclei, Phys. Rev. C 114, 034311 (2026)
- , High-resolution multi-reflection time-of-flight mass spectrometer for exotic nuclei at IGISOL, Nucl. Instrum. Methods A 1088, 171513 (2026)
- , Identification of MNT fragments produced by an energy-degraded ²³⁸U beam on a ²⁰⁹Bi target at the FRS Ion Catcher, Eur. Phys. J. A 62, 138 (2026)
2025
- , Ultralow Qβ value for the allowed decay of ¹¹⁰Agm confirmed via mass measurements, Phys. Rev. Lett. 134, 172501 (2025)
- , Prominent bump in the two-neutron separation energies of neutron-rich lanthanum isotopes revealed by high-precision mass spectrometry, Phys. Rev. Lett. 134, 042501 (2025)
- , Direct mass measurement of ⁹³Pd and implications for the isomer structures in ⁹⁴Ag, Phys. Rev. Research 7, L042022 (2025)
- , Discovery of a new long-lived isomer in ¹¹⁴Rh via Penning-trap mass spectrometry, Phys. Lett. B 862, 139359 (2025)
- , Disentangling the influence of excitation energy and compound nucleus angular momentum on fission fragment angular momentum, Phys. Rev. C 111, L031601 (2025)
- , Miniaturised cooler-buncher for reduction of longitudinal emittance at IGISOL, Nucl. Instrum. Methods A 1072, 170186 (2025)
- , Performance of a precise isochronous magnetic field over a wide momentum range in the Rare-RI Ring, Nucl. Instrum. Methods A 1072, 170083 (2025)
- , Probing the quantum phase transition near N ≈ 60 via mass measurements of technetium isotopes, Phys. Rev. C 112, 064302 (2025) · arXiv:2505.15625
- , Performance of the MORA apparatus for testing time-reversal invariance in nuclear beta decay, Eur. Phys. J. A 61, 221 (2025) · arXiv:2504.16957
- , First observation of MNT isotope beams at the FRS Ion Catcher, Nucl. Phys. A 1057, 123041 (2025)
- , High-precision mass measurements of the ground and isomeric states in ¹²⁴,¹²⁵Ag, Phys. Rev. C 111, 044314 (2025) · arXiv:2408.14181
- , Isomeric yield ratios and mass spectrometry of Y and Nb isotopes in the neutron-rich N = 60 region: The unusual case of ⁹⁸Y, Phys. Lett. B 871, 140012 (2025)
2024
- , Mass measurements in the ¹³²Sn region with the JYFLTRAP double Penning trap mass spectrometer, Phys. Rev. C 110, 034325 (2024)
- , Precision mass measurements in the zirconium region pin down the mass surface across the neutron midshell at N = 66, Phys. Lett. B 856, 138916 (2024)
- , A laser ablation carbon cluster ion source for the FRS Ion Catcher, Nucl. Instrum. Methods A 1064, 169371 (2024)
- , Novel device to study double-alpha decay at the FRS Ion Catcher, Nucl. Instrum. Methods A 1063, 169252 (2024)
- , Detailed structure of ¹³¹Sn populated in the β decay of isomerically purified ¹³¹In states, Phys. Rev. C 110, 014328 (2024)
- , First investigation on the isomeric ratio in multinucleon transfer reactions: Entrance channel effects on the spin distribution, Phys. Lett. B 853, 138654 (2024)
- , Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL, Phys. Rev. C 110, 034326 (2024) · arXiv:2403.04710
- , Isospin symmetry breaking in the T = 1, A = 70 triplet, Phys. Rev. C 110, 024314 (2024)
- , Octupole correlations in the N = Z + 2 = 56 ¹¹⁰Xe nucleus, Phys. Lett. B 848, 138371 (2024)
- , Probing the N = 104 midshell region for the r process via precision mass spectrometry of neutron-rich rare-earth isotopes with the JYFLTRAP double Penning trap, Phys. Rev. C 110, 045809 (2024) · arXiv:2405.08511
- , Reinvestigation of ⁹¹Sr and ⁹⁵Y atomic masses using the JYFLTRAP Penning trap, Eur. Phys. J. A 60, 37 (2024) · arXiv:2310.18065
- , γ-ray spectroscopy above the 9⁺ isomeric state in the N = Z nucleus ⁶⁶As, Eur. Phys. J. A 60, 241 (2024)
- , A compact ion source combining electron-impact and thermal ionization for multiple-reflection time-of-flight mass spectrometry, Rev. Sci. Instrum. 95, 083309 (2024)
- , Isochronous mass spectrometry at the RIKEN Rare-RI Ring facility, Phys. Rev. C 110, 014310 (2024)
2023
- , High-precision Penning-trap mass measurements of Cd and In isotopes at JYFLTRAP remove the fluctuations in the two-neutron separation energies, Phys. Rev. C 108, 064302 (2023) · arXiv:2308.15270
- , High-precision measurements of low-lying isomeric states in ¹²⁰⁻¹²⁴In with the JYFLTRAP double Penning trap, Phys. Rev. C 108, 054301 (2023) · arXiv:2306.11505
- , Precision mass measurement of ¹⁷³Hf for nuclear structure of ¹⁷³Lu and the γ process, Eur. Phys. J. A 59, 263 (2023) · arXiv:2308.08318
- , Binding energies of ground and isomeric states in neutron-rich ruthenium isotopes: Measurements at JYFLTRAP and comparison to theory, Phys. Rev. C 108, 064315 (2023) · arXiv:2306.04517
- , First full beta-strength measurement with DTAS across N = 126 at FAIR Phase-0, EPJ Web Conf. 290, 02006 (2023)
- , Investigation of ²²Mg levels via resonant scattering of ¹⁸Ne + α, Front. Phys. 11, 1163299 (2023)
- , Isospin symmetry in the T = 1, A = 62 triplet, Phys. Lett. B 847, 138249 (2023)
- , Novel isochronous features for FRS-ESR experiments with stored exotic projectile fragments, Nucl. Instrum. Methods B 541, 305–309 (2023)
- , Study of multinucleon knockout reactions of exotic nuclei in the region of Sn, EPJ Web Conf. 290, 02001 (2023)
2022
- , High-precision Q-value measurement and nuclear matrix element calculations for the double-β decay of ⁹⁸Mo, Eur. Phys. J. A 58, 44 (2022)
- , Direct determination of the excitation energy of the quasistable isomer ¹⁸⁰ᵐTa, Phys. Rev. C 106, 024310 (2022)
2021
- , Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer, Eur. Phys. J. A 57, 302 (2021)
- , Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring, Nucl. Instrum. Methods A 986, 164713 (2021)
- , Experimental study of ⁴n by directly detecting the decay neutrons, Few-Body Syst. 62, 102 (2021)
2020
- , High-precision mass measurement of ¹⁶⁸Yb for verification of nonlinear isotope shift, Int. J. Mass Spectrom. 458, 116435 (2020) · arXiv:2007.13375
- , Development of a new in-ring beam monitor in the Rare-RI Ring, Nucl. Instrum. Methods B 463, 241–243 (2020)
- , Efficiency and timing performance of time-of-flight detector utilizing thin foils and crossed static electric and magnetic fields for mass measurements with Rare-RI Ring facility, Nucl. Instrum. Methods A 965, 163807 (2020)
- , Experimental challenges of the first mass measurement campaign at the Rare-RI Ring, J. Phys.: Conf. Ser. 1643, 012058 (2020)
- , Experimental study on the ⁷Be(n,p)⁷Li and the ⁷Be(n,α)⁴He reactions for cosmological lithium problem, JPS Conf. Proc. 31, 011036 (2020)
- , Experimental study of ⁴n with ⁸He(p,2p) reaction, J. Phys.: Conf. Ser. 1643, 012090 (2020)
- , Study of multi-neutron systems with SAMURAI spectrometer, Springer Proc. Phys., 529–534 (2020)
- , Study on ²⁶ᵐAl(p,γ) reaction at the SNe temperature, JPS Conf. Proc. 31, 011073 (2020)
2019
- , Cross section measurements of the ⁷Be(n,p)⁷Li and the ⁷Be(n,α)⁴He reactions covering the Big-Bang nucleosynthesis energy range by the Trojan Horse method at CRIB, Springer Proc. Phys., 33–37 (2019)
- , Masses of neutron-rich ⁵²⁻⁵⁴Sc and ⁵⁴,⁵⁶Ti nuclides: The N = 32 subshell closure in scandium, Phys. Rev. C 99, 064303 (2019)
2018
- , Beam production of ¹⁸Ne with in-flight method for alpha scattering at CRIB, Nucl. Instrum. Methods A 897, 8–13 (2018)
- , Impact of the ²⁶ᵐAl(p,γ) reaction to galactic ²⁶Al yield, AIP Conf. Proc. 1947, 020003 (2018)
- , Isomeric ²⁶Al beam production with CRIB, EPJ Web Conf. 184, 02013 (2018)
- , Measurements of the neutron-induced reactions on ⁷Be with CRIB by the Trojan Horse method, AIP Conf. Proc. 1947, 020011 (2018)
- , Study of α-cluster structure in ²²Mg using a radioactive ion beam, J. Korean Phys. Soc. 73, 1055–1060 (2018)
2017
- , Application of isochronous mass spectrometry for the study of angular momentum population in projectile fragmentation reactions, Phys. Rev. C 95, 014610 (2017)
- , Half-life measurement of short-lived ⁹⁴ᵐRu using isochronous mass spectrometry, Phys. Rev. C 96, 031303 (2017)
- , Isomer beam elastic scattering: ²⁶ᵐAl(p,p) for astrophysics, EPJ Web Conf. 165, 01030 (2017)
2016
- , An improvement of isochronous mass spectrometry: Velocity measurements using two time-of-flight detectors, Nucl. Instrum. Methods B 376, 311–315 (2016)
2015
- , A data analysis method for isochronous mass spectrometry using two time-of-flight detectors at CSRe, Chin. Phys. C 39, 106201 (2015)
- , Direct mass measurements of neutron-rich ⁸⁶Kr projectile fragments and the persistence of neutron magic number N = 32 in Sc isotopes, Chin. Phys. C 39, 104001 (2015)
- , First isochronous mass measurements with two time-of-flight detectors at CSRe, Phys. Scr. T166, 014010 (2015)
- , Simulations of the isochronous mass spectrometry at the HIRFL-CSR, Phys. Scr. T166, 014044 (2015)
- , Study of projectile fragmentation reaction with isochronous mass spectrometry, Phys. Scr. T166, 014009 (2015)
2014
- , Time-of-flight detectors with improved timing performance for isochronous mass measurements at the CSRe, Nucl. Instrum. Methods A 756, 1–5 (2014)