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NSR database version of April 27, 2024.

Search: Author = S.Karampagia

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2022KA20      Nucl.Phys. A1023, 122453 (2022)

S.Karampagia, V.Zelevinsky, J.Spitler

Ratio of consecutive level spacings as a signature of chaos in nuclear many-body models

NUCLEAR STRUCTURE ⁵²Ca, ⁵²Sc, ⁵²Ti; calculated chaotic features in the energy spectra of stationary states using the latest version of the nuclear shell model, along with the interacting boson model. Comparison with available data.

doi: 10.1016/j.nuclphysa.2022.122453
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2022NA07      Nucl.Phys. A1018, 122359 (2022)

F.Naqvi, S.Karampagia, A.Spyrou, S.N.Liddick, A.C.Dombos, D.L.Bleuel, B.A.Brown, L.Crespo Campo, A.Couture, B.Crider, T.Ginter, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, G.Perdikakis, C.Prokop, T.Renstrom, S.Siem

Total absorption spectroscopy measurement on neutron-rich ^{74, 75}Cu isotopes

RADIOACTIVITY ^74,75Cu(β^-) [from ⁹Be(⁸⁶Kr, X), E=140 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced T_1/2, cumulative β-decay intensities, B(GT). Comparison with available data.

doi: 10.1016/j.nuclphysa.2021.122359
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Data from this article have been entered in the XUNDL database. For more information, click here.

2021DO07      J.Phys.(London) G48, 045103 (2021)

W.-T.Dong, Y.Zhang, B.-C.He, F.Pan, Y.-A.Luo, J.P.Draayer, S.Karampagia

Statistical analysis of the excited-state quantum phase transitions in the interacting boson model

doi: 10.1088/1361-6471/abdd8c
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2021PE08      Phys.Rev. C 103, 055808 (2021)

C.F.Persch, P.A.DeYoung, S.Lyons, A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, J.Gombas, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, J.Engel, M.Guttormsen, A.C.Larsen, R.Lewis, S.Karampagia, S.Mosby, E.M.Ney, A.Palmisano, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, M.K.Smith, S.J.Quinn

β-decay feeding intensity distributions of ^{71, 73}Ni

RADIOACTIVITY ^71,73Ni(β^-)[from ⁹Be(⁸⁶Kr, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured implantation events and β particles using position-sensitive, double-sided, silicon-strip detector (DSSD), and two silicon PIN detectors for TOF and energy loss, Eγ, Iγ, half-lives of decays of ^71,73Ni using a total absorption summing NaI(Tl) detector (SuN) surrounding the DSSD; deduced multiplicity spectra, Iβ(E) feedings, B(GT). GEANT4 and DICEBOX analysis of total absorption spectrum (TAS). Comparison with QRPA, and shell-model calculations, the latter using NuShellX@MSU code with JJ44B and JUN45 interaction Hamiltonians. Relevance to improvement in the nuclear input for r-process calculations.

NUCLEAR REACTIONS ⁹Be(⁸⁶Kr, X)⁷¹Ni/⁷³Ni/⁷¹Cu/⁷³Cu/, E=140 MeV/nucleon; measured yields of reaction products using A1900 fragment separator and two silicon PIN detectors for TOF and energy loss at NSCL-MSU facility.

doi: 10.1103/PhysRevC.103.055808
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Data from this article have been entered in the XUNDL database. For more information, click here.

2020KA38      Int.J.Mod.Phys. E29, 2030005 (2020)

S.Karampagia, V.Zelevinsky

Nuclear shell model and level density

NUCLEAR STRUCTURE ^{26,27,28,29,30,31,32}Si, ⁵²Fe, ²⁴Mg; calculated level densities.

doi: 10.1142/S0218301320300052
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2018KA12      At.Data Nucl.Data Tables 120, 1 (2018)

S.Karampagia, R.A.Senkov, V.Zelevinsky

Level density of the sd-nuclei-Statistical shell-model predictions

NUCLEAR STRUCTURE ^{19,20,21,22,23,24,25,26,27}F, ^{19,20,21,22,23,24,25,26,27,28,29}Ne, ^{20,21,22,23,24,25,26,27,28,29,30,31}Na, ^{22,23,24,25,26,27,28,29,30,31}Mg, ^{22,23,24,25,26,27,28,29,30,31,32}Al, ^{23,24,25,26,27,28,29,30,31,32,33}Si, ^{24,25,26,27,28,29,30,31,32,33,34}P, ^{26,27,28,29,30,31,32,33,34,35}S, ^{28,29,30,31,32,33,34,35,36}Cl, ^{30,31,32,33,34,35,36,37}Ar, ^{32,33,34,35,36,37}K; calculated nuclear level density using the configuration-interaction nuclear shell model; deduced the parameters of the Constant Temperature phenomenological model.

doi: 10.1016/j.adt.2017.08.001
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2018LA07      Phys.Rev. C 97, 054329 (2018)

A.C.Larsen, J.E.Midtbo, M.Guttormsen, T.Renstrom, S.N.Liddick, A.Spyrou, S.Karampagia, B.A.Brown, O.Achakovskiy, S.Kamerdzhiev, D.L.Bleuel, A.Couture, L.Crespo Campo, B.P.Crider, A.C.Dombos, R.Lewis, S.Mosby, F.Naqvi, G.Perdikakis, C.J.Prokop, S.J.Quinn, S.Siem

Enhanced low-energy γ-decay strength of ⁷⁰Ni and its robustness within the shell model

RADIOACTIVITY ⁷⁰Co(β^-)[from ⁹Be(⁸⁶Kr, X), E=140 MeV/nucleon followed by fragment separation using A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, summed γ energies, β^-γ-coin using double-sided silicon strip detector (DSSD) for electrons placed in the center of the Summing NaI (SuN) total absorption spectrometer for γ radiation. ⁷⁰Ni; deduced nuclear level density (NLD) and γ-strength function (γSF) using β-Oslo method. Comparison with previous experimental results, and with HFB+c calculations.

NUCLEAR STRUCTURE ⁷⁰Ni; calculated levels, J, π, B(E2), level densities, γSF, summed γSF, and M1 γ strengths for A=56-76 Ni isotopes. Quasiparticle time-blocking approximation and large-scale shell-model calculations with CA48MH1G and JUN45 interactions. Comparison with experimental results.

doi: 10.1103/PhysRevC.97.054329
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2018ZE02      Phys.Lett. B 783, 428 (2018)

V.Zelevinsky, S.Karampagia, A.Berlaga

Constant temperature model for nuclear level density

NUCLEAR STRUCTURE ²⁴Mg, ^28,30Si; calculated nuclear level densities. Comparison with available data.

doi: 10.1016/j.physletb.2018.07.023
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2017KA08      Phys.Rev. C 95, 024322 (2017)

S.Karampagia, B.A.Brown, V.Zelevinsky

Low energy magnetic radiation enhancement in the f_7/2 shell

NUCLEAR STRUCTURE ^49,50Cr, ⁴⁸V; calculated B(M1), γ-strength functions (γSF), distribution of M1 emission and absorption in the f_7/2 shell-model basis; deduced that slope of the exponential fall off is proportional to the energy of the T=1 pairing gap. Comparison with experimental M1 strength functions.

doi: 10.1103/PhysRevC.95.024322
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2017KA22      Nucl.Phys. A962, 46 (2017)

S.Karampagia, A.Renzaglia, V.Zelevinsky

Quantum phase transitions and collective enhancement of level density in odd-A and odd-odd nuclei

NUCLEAR STRUCTURE ^26,27,28Al, ³⁰P, ⁵⁰Mn; calculated levels, J, π, B(E2), B(M1) between discrete levels, quadrupole moments, level density using effective mean field plus interaction Hamiltonian in specific configuration space, namely sd and pf shells. Compared with available data.

doi: 10.1016/j.nuclphysa.2017.03.008
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2016KA28      Phys.Rev. C 94, 014321 (2016)

S.Karampagia, V.Zelevinsky

Nuclear shape transitions, level density, and underlying interactions

NUCLEAR STRUCTURE ²⁴Mg, ²⁸Si, ⁵²Fe; calculated energies, B(E2), and quadrupole moments of yrast 2+, 4+ and 6+ levels, and E(4+)/E(2+) ratios as functions of Hamiltonian parameters, either k₁ or k₂ with one kept fixed, cumulative number of levels, amplitudes of the ground-state wave functions in terms of proton and neutron components. Moments method, and varying the interaction matrix elements.

doi: 10.1103/PhysRevC.94.014321
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2015BO05      Phys.Rev. C 91, 054315 (2015)

D.Bonatsos, A.Martinou, N.Minkov, S.Karampagia, D.Petrellis

Octupole deformation in light actinides within an analytic quadrupole octupole axially symmetric model with a Davidson potential

NUCLEAR STRUCTURE ^222,224,226Ra, ^224,226Th; calculated levels, J, π, B(E1), BE(2), B(E3). Analytic quadrupole octupole axially (AQOA) symmetric model using Davidson potential. Bohr collective Hamiltonian, and quadrupole plus octupole deformation. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.054315
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2015KA18      Phys.Rev. C 91, 054325 (2015)

S.Karampagia, D.Bonatsos, R.F.Casten

Regularity and chaos in 0⁺ states of the interacting boson model using quantum measures

doi: 10.1103/PhysRevC.91.054325
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2013BO27      Phys.Rev. C 88, 054309 (2013)

D.Bonatsos, S.Karampagia, R.B.Cakirli, R.F.Casten, K.Blaum, L.Amon Susam

Emergent collectivity in nuclei and enhanced proton-neutron interactions

NUCLEAR STRUCTURE Z=50-82, N=82-126; analyzed empirical values of proton-neutron interaction V_pn for even and odd Z nuclei, E(4+)/E(2+) values for even A nuclei; calculated average spatial overlaps (for deformation ϵ=0.22) for proton and neutron orbitals, Nilsson diagrams; deduced enhancement of the large empirical values of p-n interactions along the Z=N line indicative of collectivity, shape changes, and the saturation of deformation. Pseudoshell approach to heavy nuclei.

doi: 10.1103/PhysRevC.88.054309
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2012BO23      J.Phys.:Conf.Ser. 366, 012025 (2012)

D.Bonatsos, S.Karampagia, R.F.Casten

Analytic derivation of the Alhassid-Whelan arc of regularity

doi: 10.1088/1742-6596/366/1/012025
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2011BO15      Phys.Rev. C 83, 054313 (2011)

D.Bonatsos, S.Karampagia, R.F.Casten

Analytic derivation of an approximate SU(3) symmetry inside the symmetry triangle of the interacting boson approximation model

doi: 10.1103/PhysRevC.83.054313
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