Publications

Aug, 2026

Journal

Direct observation of the superallowed α-decay of 104Te

Aug, 2026

Conference Paper

Decay spectroscopy in the neutron-rich Mo–Ru–Pd region

A leading challenge of nuclear-structure research is to understand the properties of nuclides of extreme isospin. Experiments at radioactive-ion-beam facilities, such as the Facility for Rare Isotope Beams in the US, may answer key questions that address diverse topics including fundamental nuclear physics, stellar nucleosynthesis and nuclear applications. The neutron-rich…

Mar, 2026

Journal

Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon 238U Beam

A search for new neutron-rich isotopes beyond Z = 28 and N = 50 was performed using a 345 MeV/nucleon 238U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for ei…

Mar, 2026

Journal

Excited states in semi-magic 82Ge populated in the βn-decay of 83Ga

The βn and β-decay of the neutron-rich 83Ga isotopes produced in proton-induced fission of 238U were studied at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory using on-line mass separation and the hybrid-3Hen neutron-γ detector array. Excited states in semi-magic 82Ge populated in βn decay of 83Ga were identified using neutron-γ coinci…

Mar, 2026

Journal

A method for estimating light quenching in inorganic scintillator detectors for radioactive ion beam experiments

In recent experiments, inorganic scintillators have been used to study the decays of exotic nuclei, providing an alternative to silicon detectors and enabling measurements that were previously impossible. However, proper use of these materials requires us to understand and quantify the scintillation process, specifically in response to very heavy nuclei. In this work, we s…

Mar, 2026

Conference Paper

New nuclear data from total absorption spectroscopy and beta-delayed neutron measurements.

Mar, 2026

Journal

Beta-Decay Half-Lives beyond 54Ca: A Systematic Survey of Decay Properties Approaching the Neutron Dripline

In an experiment performed at the Facility for Rare Isotope Beams (FRIB) using the FRIB Decay Station initiator, 15 new half-lives of isotopes near 54Ca were measured. A new method of extracting lifetimes from experimental data, taking into account the unknown 𝛽-delayed neutron emission branches of very neutron-rich nuclei, was developed to enable systematic uncertainty an…

Nov, 2025

Journal

Upper Limit for the 248Cm(50Ti, xn)298−xOg Reaction Cross Section

After the synthesis of element 113, nihonium (Nh) via the 209Bi(70Zn,n)278Nh cold fusion reaction using the RIKEN heavy-ion Linear ACcelerator (RILAC) and the GAs-filled Recoil Ion Separator (GARIS), the search for the heaviest isotopes of oganesson was initiated with GARIS-II by means of the 248Cm(50Ti,xn)298−xOg fusion evaporation reaction. The optimal bombarding energy…

Nov, 2025

Journal

Measurements of 𝛽-delayed proton emitters in the region of 100Sn

An experiment on neutron-deficient nuclei in the region of doubly magic 100Sn was carried out at the Radioactive Ion Beam Factory (RIBF) at the RIKEN Nishina Center in Japan. 𝑁≈𝑍≈50 nuclei were produced following fragmentation of an intense primary 124Xe beam and implanted in the Advanced Implantation Detector Array silicon setup for the first study of proton-rich nuclei w…

Nov, 2025

Journal

YSO implantation detector for beta-delayed neutron spectroscopy

A segmented-scintillator-based implantation detector was developed to study the energy distribution of β-delayed neutrons emitted from exotic isotopes. The detector comprises a 34 × 34 YSO scintillator coupled to an 8 × 8 anode Position-Sensitive Photo-Multiplier Tube (PSPMT) via a tapered light guide. The detector was used at RIBF, RIKEN for time-of-flight-based neutron s…

Oct, 2025

Journal

Levels in 125Cd populated by the 𝛽-decay of 125mAg and 125Ag

The 𝛽 decay of 125⁢𝑚,125Ag into levels in 125Cd was investigated at the Holifield Radioactive Ion Beam Facility (HRIBF). Uranium-238 targets were bombarded with 50-MeV protons with an intensity of 15𝜇A, and the induced fission products were mass separated and deposited on a moving tape in the center of the VANDLE array consisting of 𝛾 detectors and plastic scintillators. A…

Oct, 2025

Journal

𝛽 decay of neutron-rich 76Cu and the structure of 76Zn

The 𝛽 decay of 76Cu to the levels of 76Zn was studied at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Lab (ORNL). A purified 76Cu beam was developed and data were recorded for the decay of the 𝐴=76 decay chain using four high-purity germanium (HPGe) clover detectors at the Low-energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS). In this…