Dr. Mark Spieker

Office: 217 Keen
Phone: (850) 644-2066
mspieker@fsu.edu

Research:

Particle- and gamma-spectroscopy experiments to study low-lying nuclear structure in stable and rare isotopes.

Publications

Experimental identification of the T=1, Jπ=6+ state of 54Co and isospin symmetry in A=54 studied via one-nucleon knockout reactions
M. Spieker, D. Weisshaar, A. Gade, B. A. Brown, P. Adrich, D. Bazin, M. A. Bentley, J. R. Brown, C. M. Campbell, C. Aa. Diget, B. Elman, T. Glasmacher, M. Hill, B. Longfellow, B. Pritychenko, A. Ratkiewicz, D. Rhodes, and J. A. Tostevin
Phys. Rev. C 100, 061303(R), (2019)

Triaxiality in selenium-76
J. Henderson, C. Y. Wu, J. Ash, B. A. Brown, P. C. Bender, R. Elder, B. Elman, A. Gade, M. Grinder, H. Iwasaki, B. Longfellow, T. Mijatović, D. Rhodes, M. Spieker, and D. Weisshaar
Phys. Rev. C 99, 054313, (2019)

One-proton and one-neutron knockout reactions from N=Z=28 ⁵⁶Ni to the A=55 mirror pair ⁵⁵Co and ⁵⁵Ni
M. Spieker, A. Gade, D. Weisshaar, B. A. Brown, J. A. Tostevin, B. Longfellow, P. Adrich, D. Bazin, M. A. Bentley, J. R. Brown, C. M. Campbell, C. Aa. Diget, B. Elman, T. Glasmacher, M. Hill, B. Pritychenko, A. Ratkiewicz, and D. Rhodes
Phys. Rev. C 99, 051304(R), (2019)

Fine structure of the pygmy quadrupole resonance in ^112,114Sn
N. Tsoneva, M. Spieker, H. Lenske, A. Zilges
Nuclear Physics A 990, 183-198 (2019)

Collectivity of the 2p-2h proton intruder band of ¹¹⁶Sn
C. M. Petrache, J.-M. Régis, C. Andreoiu, M. Spieker, C. Michelagnoli, P. E. Garrett, A. Astier, E. Dupont, F. Garcia, S. Guo, G. Häfner, J. Jolie, F. Kandzia, V. Karayonchev, Y.-H. Kim, L. Knafla, U. Köster, B. F. Lv, N. Marginean, C. Mihai, P. Mutti, K. Ortner, C. Porzio, S. Prill, N. Saed-Samii, W. Urban, J. R. Vanhoy, K. Whitmore, J. Wisniewski, and S. W. Yates
Phys. Rev. C 99, 024303, (2019)

Multi-messenger investigation of the Pygmy Dipole Resonance in ¹⁴⁰Ce,
D. Savran, V. Derya, S. Bagchi, J. Endres, M.N. Harakeh, J. Isaak, N. Kalantar-Nayestanaki, E.G. Lanza, B. Löher, A. Najafi, S. Pascu, S.G. Pickstone, N. Pietralla, V.Yu. Ponomarev, C. Rigollet, C. Romig, M. Spieker, A. Vitturi, A. Zilges
Physics Letters B 786, 16-20, (2018)

Investigation of J=1 states and their γ-decay behavior in ⁵²Cr
J. Wilhelmy, B. A. Brown, P. Erbacher, U. Gayer, J. Isaak, Krishichayan, B. Löher, M. Müscher, H. Pai, N. Pietralla, P. Ries, D. Savran, P. Scholz, M. Spieker, W. Tornow, V. Werner, and A. Zilges
Phys. Rev. C 98, 034315, (2018)

Localizing the Shape Transition in Neutron-Deficient Selenium
J. Henderson, C. Y. Wu, J. Ash, P. C. Bender, B. Elman, A. Gade, M. Grinder, H. Iwasaki, E. Kwan, B. Longfellow, T. Mijatović, D. Rhodes, M. Spieker, and D. Weisshaar
Phys. Rev. Lett. 121, 082502, (2018)

High-resolution (p,t) study of low-spin states in ²⁴⁰Pu: Octupole excitations, α clustering, and other structure features
M. Spieker, S. Pascu, D. Bucurescu, T. M. Shneidman, T. Faestermann, R. Hertenberger, H.-F. Wirth, N.-V. Zamfir, and A. Zilges
Phys. Rev. C 97, 064319, (2018)

Shape coexistence and collective low-spin states in ^112,114Sn studied with the (p,p′γ) Doppler-shift attenuation coincidence technique
M. Spieker, P. Petkov, E. Litvinova, C. Müller-Gatermann, S. G. Pickstone, S. Prill, P. Scholz, and A. Zilges
Phys. Rev. C 97, 054319, (2018)

The pygmy quadrupole resonance and neutron-skin modes in ¹²⁴Sn
M.Spieker, N.Tsoneva, V.Derya, J.Endres, D.Savran, M.N.Harakeh, S.Harissopulos, R.-D.Herzberg, A.Lagoyannis, H.Lenske, N.Pietralla, L.Popescu, M.Scheck, F.Schlüter, K.Sonnabend, V.I.Stoica, H.J.Wörtche, A.Zilges
Physics Letters B 752, 102-107, (2016)

Experimental constraints on the γ-ray strength function in ⁹⁰Zr using partial cross sections of the ⁸⁹Y(p,γ)⁹⁰Zr reaction
L.Netterdon, A.Endres, S.Goriely, J.Mayer, P.Scholz, M.Spieker, A.Zilges
Physics Letters B 744, 358-362, (2015)

Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei
M. Spieker, S. Pascu, A. Zilges, and F. Iachello
Phys. Rev. Lett. 114, 192504, (2015)

Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones
A. Hennig, M. Spieker, V. Werner, T. Ahn, V. Anagnostatou, N. Cooper, V. Derya, M. Elvers, J. Endres, P. Goddard, A. Heinz, R. O. Hughes, G. Ilie, M. N. Mineva, P. Petkov, S. G. Pickstone, N. Pietralla, D. Radeck, T. J. Ross, D. Savran, and A. Zilges
Phys. Rev. C 90, 051302(R), (2014)

Possible experimental signature of octupole correlations in the 0₂⁺ states of the actinides
M. Spieker, D. Bucurescu, J. Endres, T. Faestermann, R. Hertenberger, S. Pascu, S. Skalacki, S. Weber, H.-F. Wirth, N.-V. Zamfir, and A. Zilges
Phys. Rev. C 88, 041303(R), (2013)

Selected Invited talks

"α-cluster states and their connection to the E1 strength of heavy nuclei"
43rd Symposium on Nuclear Physics, Cocoyoc, Mexico, January 2020