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Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon 238U
A search for isomeric gamma-decays among fission fragments from 345 MeV/nucleon 238U has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected and identifiedExpand
X-ray pumping of the 229Th nuclear clock isomer
Active optical pumping is presented using narrow-band 29-kiloelectronvolt synchrotron radiation to resonantly excite the second excited state of 229Th, which then decays predominantly into the isomer, enabling accurate determination of the 229mTh isomer’s energy, half-life and excitation linewidth. Expand
Neutrino spectroscopy with atoms and molecules
We give a comprehensive account of our proposed experimental method of using atoms or molecules in order to measure parameters of neutrinos still undetermined; the absolute mass scale, the massExpand
Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell
Abstract The electric quadrupole coupling constant of the 31 Al ground state is measured to be ν Q = | e Q V z z h | = 2196 ( 21 ) kHz using two different β -NMR (Nuclear Magnetic Resonance)Expand
Fast x-ray detector system with simultaneous measurement of timing and energy for a single photon.
A fast X-ray detector system for nuclear resonant scattering experiments that successfully observed the NRS from the 26.27-keV level of mercury-201, and demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy. Expand
Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon
A search for new isotopes using in-flight fission of a 345 MeV/nucleon 238 U beam has been carried out at the RI Beam Factory at the RIKEN Nishina Center. Fission fragments were analyzed and identi...
Externally triggered coherent two-photon emission from hydrogen molecules
We report coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed theExpand
Experimental search for the electron electric dipole moment with laser cooled francium atoms
A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laserExpand
Nuclear spin maser with an artificial feedback mechanism
Abstract We describe a scheme for nuclear spin maser which has an artificial feedback to the nuclear spins to bring about a self-sustained nuclear spin precession and thus to allow unlimitedly longExpand
Development of co-located 129Xe and 131Xe nuclear spin masers with external feedback scheme
Abstract We report on the operation of co-located 129Xe and 131Xe nuclear spin masers with an external feedback scheme, and discuss the use of 131Xe as a comagnetometer in measurements of the 129XeExpand