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NSR database version of May 24, 2024.

Search: Author = T.Schumm

Found 12 matches.

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2024SI07      Nucl.Instrum.Methods Phys.Res. A1062, 169239 (2024)

T.Sikorsky, A.Pelczar, S.Schneider, Th.Schumm

Integrating superregenerative principles in a compact, power-efficient NMR/NQR spectrometer: A novel approach with pulsed excitation

NUCLEAR MOMENTS 35Cl; measured frequencies; deduced NQR signal with sub-kHz resolution. Nuclear Quadrupole Resonance (NQR)/Nuclear Magnetic Resonance (NMR) spectroscopy, the Damp-Enhanced Superregenerative Nuclear Spin Analyser (DESSA).

doi: 10.1016/j.nima.2024.169239
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2024TI04      Phys.Rev.Lett. 132, 182501 (2024)

J.Tiedau, M.V.Okhapkin, K.Zhang, J.Thielking, G.Zitzer, E.Peik, F.Schaden, T.Pronebner, I.Morawetz, L.T.De Col, F.Schneider, A.Leitner, M.Pressler, G.A.Kazakov, K.Beeks, T.Sikorsky, T.Schumm

Laser Excitation of the Th-229 Nucleus

RADIOACTIVITY 229Th(IT); measured resonance fluorescence signal frequency; deduced the wavelength, the fluorescence lifetime in the crystal of Th-doped CaF2, isomer T1/2 for a nucleus isolated in vacuum. Nuclear laser spectroscopy and realizing optical nuclear clocks applications.

doi: 10.1103/PhysRevLett.132.182501
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2023KR02      Nature(London) 617, 706 (2023)

S.Kraemer, J.Moens, M.Athanasakis-Kaklamanakis, S.Bara, K.Beeks, P.Chhetri, K.Chrysalidis, A.Claessens, T.E.Cocolios, J.G.M.Correia, H.De Witte, R.Ferrer, S.Geldhof, R.Heinke, N.Hosseini, M.Huyse, U.Koster, Y.Kudryavtsev, M.Laatiaoui, R.Lica, G.Magchiels, V.Manea, C.Merckling, L.M.C.Pereira, S.Raeder, T.Schumm, S.Sels, P.G.Thirolf, S.M.Tunhuma, P.Van Den Bergh, P.Van Duppen, A.Vantomme, M.Verlinde, R.Villarreal, U.Wahl

Observation of the radiative decay of the 229Th nuclear clock isomer

RADIOACTIVITY 229Ac(β-), 229Th(IT) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced isomeric transition energies and T1/2. Comparison with available data. The ISOLDE facility at CERN.

doi: 10.1038/s41586-023-05894-z
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2020NI02      Phys.Rev.Lett. 125, 032501 (2020)

B.S.Nickerson, M.Pimon, P.V.Bilous, J.Gugler, K.Beeks, T.Sikorsky, P.Mohn, T.Schumm, A.Palffy

Nuclear Excitation of the 229Th Isomer via Defect States in Doped Crystals

RADIOACTIVITY 229Th(IT); calculated electronic bridge excitation rates involving stimulated emission or absorption using an optical laser.

doi: 10.1103/PhysRevLett.125.032501
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2020SI22      Phys.Rev.Lett. 125, 142503 (2020)

T.Sikorsky, J.Geist, D.Hengstler, S.Kempf, L.Gastaldo, C.Enss, C.Mokry, J.Runke, C.E.Dullmann, P.Wobrauschek, K.Beeks, V.Rosecker, J.H.Sterba, G.Kazakov, T.Schumm, A.Fleischmann

Measurement of the 229Th Isomer Energy with a Magnetic Microcalorimeter

RADIOACTIVITY 233U(α), 229Th(IT); measured decay products, Eγ, Iγ; deduced partial nuclear level scheme, isomer energies and uncertainties, branching ratios of the relevant excited states. Comparison with available data.

doi: 10.1103/PhysRevLett.125.142503
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2019MA63      Nature(London) 573, 238 (2019)

T.Masuda, A.Yoshimi, A.Fujieda, H.Fujimoto, H.Haba, H.Hara, T.Hiraki, H.Kaino, Y.Kasamatsu, S.Kitao, K.Konashi, Y.Miyamoto, K.Okai, S.Okubo, N.Sasao, M.Seto, T.Schumm, Y.Shigekawa, K.Suzuki, S.Stellmer, K.Tamasaku, S.Uetake, M.Watanabe, T.Watanabe, Y.Yasuda, A.Yamaguchi, Y.Yoda, T.Yokokita, M.Yoshimura, K.Yoshimura

X-ray pumping of the 229Th nuclear clock isomer

RADIOACTIVITY 229Th(IT); measured decay products, Eγ, Iγ; deduced nuclear resonance scattering curves, active optical pumping into 229mTh, resonance energy and T1/2, branching ratios.

doi: 10.1038/s41586-019-1542-3
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2019SE13      Nature(London) 573, 243 (2019)

B.Seiferle, L.von der Wense, P.V.Bilous, I.Amersdorffer, C.Lemell, F.Libisch, S.Stellmer, T.Schumm, C.E.Dullmann, A.Palffy, P.G.Thirolf

Energy of the 229Th nuclear clock transition

RADIOACTIVITY 229Th(IT); measured decay products, Eγ, Iγ; deduced transition energy of this isomeric state to the ground state with an uncertainty of 0.17 electronvolts (one standard deviation) using spectroscopy of the internal conversion electrons emitted in flight during the decay of neutral 229mTh atoms.

doi: 10.1038/s41586-019-1533-4
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2018ST09      Phys.Rev. A 97, 062506 (2018)

S.Stellmer, G.Kazakov, M.Schreitl, H.Kaser, M.Kolbe, T.Schumm

Attempt to optically excite the nuclear isomer in 229Th

RADIOACTIVITY 229Th(IT) [from 229Th(γ, γ'), E ∼ 7.8 eV]; measured decay products, Eγ, Iγ; deduced coefficients for various decay curves, isomer T1/2 limits.

doi: 10.1103/PhysRevA.97.062506
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2018ST11      Phys.Rev. C 98, 014317 (2018)

S.Stellmer, Y.Shigekawa, V.Rosecker, G.A.Kazakov, Y.Kasamatsu, Y.Yasuda, A.Shinohara, T.Schumm

Toward an energy measurement of the internal conversion electron in the deexcitation of the 229Th isomer

RADIOACTIVITY 229mTh(IT)[from 233U(α)]; measured Eα, Iα, ce, (ce)α-coin using CANBERRA Passivated Implanted Planar Silicon (PIPS) detector. Numerical simulations by SRIM package for optimizing the stopping layer thickness. Discussed experimental method towards determining excitation energy of first excited isomeric state of 229Th. Relevance to applications of 229mTh as a nuclear clock.

doi: 10.1103/PhysRevC.98.014317
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2018YO02      Phys.Rev. C 97, 024607 (2018)

A.Yoshimi, H.Hara, T.Hiraki, Y.Kasamatsu, S.Kitao, Y.Kobayashi, K.Konashi, R.Masuda, T.Masuda, Y.Miyamoto, K.Okai, S.Okubo, R.Ozaki, N.Sasao, O.Sato, M.Seto, T.Schumm, Y.Shigekawa, S.Stellmer, K.Suzuki, S.Uetake, M.Watanabe, A.Yamaguchi, Y.Yasuda, Y.Yoda, K.Yoshimura, M.Yoshimura

Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of 201Hg

NUCLEAR REACTIONS 201Hg(γ, γ), E=high brilliance synchrotron radiation; measured decay signals, fluorescence energy spectrum, x-rays, half-life of 26.27-keV state of 201Hg, nuclear resonant scattering (NRS) technique using BL09XU of SPring-8 of Japan Synchrotron Radiation Research Institute (JASRI). 201Hg; deduced level, B(M1), σ(NRS).

doi: 10.1103/PhysRevC.97.024607
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Data from this article have been entered in the XUNDL database. For more information, click here.


2017BI04      Phys.Rev. A 95, 032503 (2017)

P.V.Bilous, G.A.Kazakov, I.D.Moore, T.Schumm, A.Palffy

Internal conversion from excited electronic states of 229Th ions

NUCLEAR STRUCTURE 229Th; calculated internal conversion coefficients, lifetimes of the excited electronic states, internal conversion rates. Comparison with available data.

doi: 10.1103/PhysRevA.95.032503
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2016ST16      Phys.Rev. C 94, 014302 (2016)

S.Stellmer, M.Schreitl, G.A.Kazakov, J.H.Sterba, T.Schumm

Feasibility study of measuring the 229Th nuclear isomer transition with 233U-doped crystals

RADIOACTIVITY 229Th(IT)[from α decay of 233U doped into VUV-transparent crystals]; analyzed feasibility of measuring very-low energy nuclear isomeric transition from 229mTh decay from measurements of the VUV optical transmission; analyzed signal background dominated by Cherenkov radiation from β decays of the thorium decay chain.

doi: 10.1103/PhysRevC.94.014302
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