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NSR database version of April 27, 2024.

Search: Author = S.Stellmer

Found 8 matches.

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2020VO09      Eur.Phys.J. A 56, 176 (2020)

L.von der Wense, P.V.Bilous, B.Seiferle, S.Stellmer, J.Weitenberg, P.G.Thirolf, A.Palffy, G.Kazakov

The theory of direct laser excitation of nuclear transitions

doi: 10.1140/epja/s10050-020-00177-x
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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 T_1/2, branching ratios.

doi: 10.1038/s41586-019-1542-3
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Data from this article have been entered in the XUNDL database. For more information, click here.

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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Data from this article have been entered in the XUNDL database. For more information, click here.

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 T_1/2 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.

2017VO08      Phys.Rev.Lett. 119, 132503 (2017)

L.von der Wense, B.Seiferle, S.Stellmer, J.Weitenberg, G.Kazakov, A.Palffy, P.G.Thirolf

A Laser Excitation Scheme for ^229mTh

RADIOACTIVITY ²²⁹Th(IT); analyzed available data; deduced direct laser excitation scheme.

doi: 10.1103/physrevlett.119.132503
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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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