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NSR database version of May 21, 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 T1/2, 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 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.


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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