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NSR database version of April 26, 2024.

Search: Author = A.Escuderos

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2017PE05      Int.J.Mod.Phys. E26, 1740021 (2017)

W.Pereira, R.Garcia, L.Zamick, A.Escuderos, K.NeergArd

Partial conservation law in a schematic single j shell model

doi: 10.1142/S0218301317400213
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2017ZA08      Rom.J.Phys. 62, 302 (2017)

L.Zamick, A.Escuderos

Degeneracies with the QQ Interaction in a Single-j Shell

2014RO02      Phys.Rev. C 89, 014316 (2014)

S.J.Q.Robinson, T.Hoang, L.Zamick, A.Escuderos, Y.Y.Sharon

Shell model calculations of B(E2) values, static quadrupole moments, and g factors for a number of N=Z nuclei

NUCLEAR STRUCTURE ⁴⁴Ti, ⁴⁸Cr, ⁵²Fe, ⁸⁸Ru, ⁹²Pd, ⁹⁶Cd; calculated levels, J, π, B(E2), static quadrupole moments, g factors. Large-scale shell model calculations using GXFP1, FPD6, JUN45, and JJ4B interactions. Comparisons with predictions of rotational and vibrational models, and with available experimental data. Oblate structure of ⁸⁸Ru.

doi: 10.1103/PhysRevC.89.014316
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2013ZA04      Phys.Rev. C 87, 044302 (2013)

L.Zamick, A.Escuderos

Odd-j pairing in nuclei

NUCLEAR STRUCTURE ⁹⁶Cd; calculated levels, J, π of yrast even spins, wave functions for g.s., 2+ and 8+ states. Shell-model calculations with J=J_max pairing interactions. Eigenstates of E(9) and normalized U9-j coefficients.

doi: 10.1103/PhysRevC.87.044302
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2013ZA08      Phys.Rev. C 87, 067302 (2013)

L.Zamick, A.Escuderos, S.J.Q.Robinson, Y.Y.Sharon, M.W.Kirson

Isobaric analog states in the f_7/2 and g_9/2 shells

NUCLEAR STRUCTURE ^44,46Sc, ^44,46Ca, ⁵²Mn, ⁵²Cr, ⁶⁰Cu, ⁶⁰Ni, ⁹⁴Rh, ⁹⁴Ru, ⁹⁶Ag, ⁹⁶Pd; calculated Coulomb energy estimates for pairs of nuclei using various mass formulas. ^44,46Sc, ⁵²Mn, ⁶⁰Cu, ⁹⁴Rh, ⁹⁶Ag; calculated energies of isobaric analog states (IAS) with T=2 and 3 using binding energy formulas and Coulomb energies, and shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.067302
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2013ZA10      Phys.Rev. C 88, 014326 (2013)

L.Zamick, A.Escuderos

Large-j limit for certain 9-j symbols: Power law behavior

doi: 10.1103/PhysRevC.88.014326
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2012ZA03      Nucl.Phys. A889, 8 (2012)

L.Zamick, A.Escuderos

Single j-shell studies of cross-conjugate nuclei and isomerism: (2j-1) rule

NUCLEAR STRUCTURE ⁴⁴Sc, ⁴⁴Ti, ⁵²Fe, ⁵²Mn; calculated yrast spectra. ⁹⁶Ag, ⁹⁶Cd; calculated levels, J using j-shell model space with different interactions, considered isomeric states. Compared to data.

doi: 10.1016/j.nuclphysa.2012.06.003
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2012ZA05      Phys.Rev. C 86, 047306 (2012)

L.Zamick, A.Escuderos

Symmetries in the g_9/2 shell

NUCLEAR STRUCTURE ⁹⁶Cd; calculated levels, J, π, wave functions, single j-shell calculation, symmetries. Two-body interaction matrix elements with isospin T=0.

doi: 10.1103/PhysRevC.86.047306
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2010ES06      J.Phys.(London) G37, 125108 (2010)

A.Escuderos, A.Faessler, V.Rodin, F.Simkovic

Contributions of different neutron pairs in different approaches for neutrinoless double-beta decay

RADIOACTIVITY ⁴⁸Ca, ⁷⁶Ge, ⁸²Se, ^94,96Zr, ^98,100Mo, ¹⁰⁴Ru, ¹¹⁰Pd, ¹¹⁶Cd, ¹²⁴Sn, ^128,130Te, ¹³⁶Xe, ¹⁵⁰Nd, ¹⁵⁴Sm(2β^-); calculated the neutrinoless 2β-decay matrix elements. QRPA, shell, HFB, IBM models.

doi: 10.1088/0954-3899/37/12/125108
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2008SP01      Phys.Lett. B 659, 101 (2008)

K.-H.Speidel, S.Schielke, J.Leske, N.Pietralla, T.Ahn, A.Costin, M.v.Schmid, O.Zell, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

First g-factor measurements on semi-magic ³⁶S and their implications for the rigidity of the N = 20 shell closure

NUCLEAR REACTIONS ¹²C(³⁶S, ³⁶S'), (³⁶S, ⁴⁰Ar), E=70 MeV; measured Eγ, Iγ, T_1/2 using transient field technique and DSA; ³⁶S, ⁴⁰Ar; deduced B(E2), g-factor. Comparison with shell model and previous results.

doi: 10.1016/j.physletb.2007.11.049
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Data from this article have been entered in the XUNDL database. For more information, click here.

2008SP04      Phys.Rev. C 78, 017304 (2008)

K.-H.Speidel, S.Schielke, J.Leske, N.Pietralla, T.Ahn, A.Costin, O.Zell, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

New shell model calculations for ⁴⁰Ar based on recent g-factor and lifetime measurements

NUCLEAR REACTIONS ¹²C(³⁶S, ⁴⁰Ar), E=70 MeV; measured Eγ, Iγ, particle spectra, γγ-coin, (particle)γ-coin, g-factors, B(E2). ⁴⁰Ar; measured half-lives of 2+ and 4+ states using Doppler-shift attenuation method; deduced levels, J, π.

doi: 10.1103/PhysRevC.78.017304
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Data from this article have been entered in the XUNDL database. For more information, click here.

2007BE42      Phys.Atomic Nuclei 70, 1330 (2007)

N.Benczer-Koller, G.J.Kumbartzki, P.Boutachkov, A.Escuderos, Y.Y.Sharon, L.Zamick, E.A.Stefanova, S.J.Q.Robinson, V.Werner

Magnetic moments: Study of the interplay between single-particle and collective excitations

NUCLEAR STRUCTURE ^38,40S, ^36,38,40Ar, ⁷⁰Ge, ^92,94Zr; analyzed coulomb excitation data for g-factor measurements for mixed symmetry states. Compared results to model calculations.

doi: 10.1134/S1063778807080029
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2007BO04      Phys.Rev. C 75, 021302 (2007)

P.Boutachkov, N.Benczer-Koller, G.J.Kumbartzki, A.Escuderos, Y.Y.Sharon, L.Zamick, S.J.Q.Robinson, H.Ai, M.Chamberlain, G.Gurdal, A.Heinz, E.A.McCutchan, J.Quian, V.Werner, E.Williams, K.Aleksandrova, C.A.Copos, D.A.Kovacheva, P.Manchev

Sign of the g factor of the 4⁺₁ state in ⁶⁸Zn

NUCLEAR REACTIONS ¹²C(⁶⁸Zn, ⁶⁸Zn'), E=180, 200 MeV; measured Eγ, Iγ(θ, H, t), (particle)γ-coin following projectile Coulomb excitation. ⁶⁸Zn deduced levels, J, π, g. Transient field technique. Comparison with model predictions.

doi: 10.1103/PhysRevC.75.021302
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Data from this article have been entered in the XUNDL database. For more information, click here.

2007BO41      Phys.Rev. C 76, 054311 (2007)

P.Boutachkov, S.J.Q.Robinson, A.Escuderos, G.Kumbartzki, N.Benczer-Koller, E.Stefanova, Y.Y.Sharon, L.Zamick, E.A.McCutchan, V.Werner, H.Ai, A.B.Garnsworthy, G.Gurdal, A.Heinz, J.Qian, N.J.Thompson, E.Williams, R.Winkler

Measurement of the g factor of the 4⁺₁ state in ⁷⁰Ge

NUCLEAR REACTIONS C(⁷⁰Ge, X)⁷⁰Ge, E=190, 225 MeV; measured Eγ, Iγ; deduced levels, J, π, g-factors for 2⁺, 3⁺ and 4⁺ states, B(E2), half-lives. Comparison with calculated and measured g-factors of ^64,66,68Zn, ^{74,76,78,80,82}Se.

doi: 10.1103/PhysRevC.76.054311
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Data from this article have been entered in the XUNDL database. For more information, click here.

2006ES01      Phys.Rev. C 73, 027301 (2006)

A.Escuderos, S.J.Q.Robinson, L.Zamick

Full major shell calculation for states that were degenerate in a single j-shell calculation

NUCLEAR STRUCTURE ⁴³Sc, ^44,45Ti, ^46,47V; calculated levels, J, π, configurations, energy splitting. Full shell-model calculation.

doi: 10.1103/PhysRevC.73.027301
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2006ES02      Phys.Rev. C 73, 044302 (2006)

A.Escuderos, L.Zamick

Seniority conservation and seniority violation in the g_9/2 shell

NUCLEAR STRUCTURE ^82,83,85,87Zr, ⁹³Tc, ⁹⁵Rh, ⁹⁷Ag, ⁹⁸Cd; calculated levels, J, π, seniority mixing features. Three interactions considered.

doi: 10.1103/PhysRevC.73.044302
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2006LE31      Phys.Rev. C 74, 024315 (2006)

J.Leske, K.-H.Speidel, S.Schielke, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

Low-level structure of ⁷⁰Ge from lifetime and g-factor measurements following α transfer to a ⁶⁶Zn ion beam

NUCLEAR REACTIONS ¹²C(⁶⁶Zn, 2α), (⁶⁶Zn, ⁶⁶Zn'), E=180 MeV; measured Eγ, Iγ(θ, H, t), αγ-coin, DSA. ⁷⁰Ge deduced levels, J, π, T_1/2, B(E2), g factor. Comparison with previous results, model predictions.

doi: 10.1103/PhysRevC.74.024315
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Data from this article have been entered in the XUNDL database. For more information, click here.

2006RO13      Phys.Rev. C 73, 037306 (2006)

S.J.Q.Robinson, A.Escuderos, L.Zamick, P.von Neumann-Cosel, A.Richter, R.W.Fearick

Shell-model test of the rotational-model relation between static quadrupole moments Q(2⁺₁), B(E2)'s, and orbital M1 transitions

NUCLEAR STRUCTURE ^44,46,48Ti, ^48,50Cr; calculated quadrupole moments, B(E2), B(M1). Comparison of shell model and collective model results.

doi: 10.1103/PhysRevC.73.037306
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2006ZA08      Int.J.Mod.Phys. E15, 1681 (2006)

L.Zamick, A.Escuderos

Symmetries and structure in the fp shell and g_9/2 shell

NUCLEAR STRUCTURE ⁴³Sc, ^43,44Ti, ⁴⁶V, ⁵⁰Cr; calculated levels, J, wavefunctions, symmetry features.

doi: 10.1142/S021830130600540X
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2005ES11      Phys.Rev. C 72, 054301 (2005)

A.Escuderos, B.F.Bayman, L.Zamick, S.J.Q.Robinson

Degeneracies when only T = 1 two-body interactions are present

NUCLEAR STRUCTURE ⁴³Sc, ^44,45Ti, ^46,47V; calculated levels, J, π, configurations; deduced explanation for degeneracies.

doi: 10.1103/PhysRevC.72.054301
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2005LE19      Phys.Rev. C 71, 044316 (2005)

J.Leske, K.-H.Speidel, S.Schielke, O.Kenn, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

Nuclear structure of the first 2⁺ state in radioactive ⁶⁸Ge based on g factor and lifetime measurements

NUCLEAR REACTIONS ¹²C(⁶⁴Zn, 2α), E=180 MeV; measured Eγ, Iγ(θ, H, t), αα-, αγ-coin. ⁶⁸Ge deduced level energies, B(E2), g factor. Transient field technique.

doi: 10.1103/PhysRevC.71.044316
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2005RA03      Phys.Rev. C 71, 024307 (2005)

A.A.Raduta, C.M.Raduta, A.Escuderos

Description of the two neutrino double β decay in deformed nuclei with projected spherical single particle basis

RADIOACTIVITY ⁴⁸Ca, ⁹⁶Zr, ¹⁰⁰Mo, ¹⁰⁴Ru, ¹¹⁰Pd, ¹¹⁶Cd, ^128,130Te, ^134,136Xe(2β); calculated 2νββ-decay T_1/2, Gamow-Teller amplitudes, strength distributions. Proton-neutron quasiparticle RPA, angular-momentum-projected single-particle basis.

doi: 10.1103/PhysRevC.71.024307
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2005RO33      Phys.Rev. C 72, 034314 (2005)

S.J.Q.Robinson, A.Escuderos, L.Zamick

Unfolding the effects of the T=0 and T=1 parts of the two-body interaction on nuclear collectivity in the f-p shell

NUCLEAR STRUCTURE ^44,46,48Ti, ^48,50Cr, ⁴⁶V; calculated levels, J, π, B(E2); deduced role of T=0 two-body matrix elements. Comparisons with data.

doi: 10.1103/PhysRevC.72.034314
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2005ZA01      Phys.Rev. C 71, 014315 (2005)

L.Zamick, A.Escuderos

Companion problems in quasispin and isospin

doi: 10.1103/PhysRevC.71.014315
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2005ZA04      Phys.Rev. C 71, 034317 (2005)

L.Zamick, A.Escuderos, S.J.Lee, A.Z.Mekjian, E.Moya de Guerra, A.A.Raduta, P.Sarriguren

Expressions for the number of J=0 pairs in even-even Ti isotopes

NUCLEAR STRUCTURE ^44,46,48Ti; calculated number of nucleon pairs vs angular momentum, effect of nucleon-nucleon interaction.

doi: 10.1103/PhysRevC.71.034317
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2005ZA06      Phys.Rev. C 71, 054308 (2005)

L.Zamick, A.Escuderos

Alternate derivation of Ginocchio-Haxton relation [2j + 3/6]

doi: 10.1103/PhysRevC.71.054308
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2005ZA12      Phys.Rev. C 72, 044317 (2005)

L.Zamick, A.Escuderos

Isospin relations for four nucleons in a single j shell

doi: 10.1103/PhysRevC.72.044317
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2004RA13      Phys.Rev. C 69, 064321 (2004)

A.A.Raduta, A.Escuderos, A.Faessler, E.Moya de Guerra, P.Sarriguren

Two neutrino double-β decay in deformed nuclei with an angular momentum projected basis

RADIOACTIVITY ⁷⁶Ge, ⁸²Se, ^148,150Nd, ¹⁵⁴Sm, ¹⁶⁰Gd, ²³²Th, ²³⁸U(2β^-); calculated 2ν-accompanied 2β-decay Gamow-Teller amplitudes, strength distributions, T_1/2. Proton-neutron quasiparticle RPA.

doi: 10.1103/PhysRevC.69.064321
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2002RA02      Phys.Rev. C65, 024312 (2002)

A.A.Raduta, A.Escuderos, E.Moya de Guerra

Description of Collective Magnetic States within a Spherical Single Particle Basis

NUCLEAR STRUCTURE ^{144,148,150,152,154}Sm; calculated B(M1) strength distributions, related features. Quasiparticle RPA, spherical single particle basis. Comparisons with data, previous results.

doi: 10.1103/PhysRevC.65.024312
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2001MO25      Nucl.Phys. A690, 276c (2001)

E.Moya de Guerra, P.Sarriguren, A.Escuderos, J.Jung

Spin-Isospin Excitations and Beta-Decay of Proton Rich Nuclei

NUCLEAR STRUCTURE ^64,66,68Ge, ⁸²Sr; calculated M1, Gamow-Teller strength distributions, deformation dependent features. Self-consistent quasiparticle RPA.

doi: 10.1016/S0375-9474(01)00958-7
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2001SA50      Nucl.Phys. A691, 631 (2001)

P.Sarriguren, E.Moya de Guerra, A.Escuderos

Spin-Isospin Excitations and β⁺/EC Half-Lives of Medium-Mass Deformed Nuclei

NUCLEAR STRUCTURE ^64,66,68,70Ge, ^68,70,72,74Se, ^72,74,76,78Kr, ^76,78,80,82Sr; calculated Gamow-Teller and spin M1 strength distributions, T_1/2 for β⁺/EC decay, deformation effects. Self-consistent approach.

doi: 10.1016/S0375-9474(01)00565-6
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2001SA67      Phys.Rev. C64, 064306 (2001)

P.Sarriguren, E.Moya de Guerra, A.Escuderos

β Decay in Odd-A and Even-Even Proton-Rich Kr Isotopes

RADIOACTIVITY ^{69,70,71,72,73,74,75,76,77}Kr(EC), (β⁺); calculated Gamow-Teller strength distributions, Q(EC), T_1/2, deformation dependence. Self-consistent Hartree-Fock approach, comparisons with data.

doi: 10.1103/PhysRevC.64.064306
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2001UD01      Phys.Rev. C64, 024614 (2001)

J.M.Udias, J.A.Caballero, E.Moya de Guerra, J.R.Vignote, A.Escuderos

Relativistic Mean Field Approximation to the Analysis of ¹⁶O(e, e'p)¹⁵N Data at |Q²| ≤ 0.4 (GeV/c)²

NUCLEAR REACTIONS ¹⁶O(e, e'p), E ≈ 300-600 MeV; analyzed σ(E), response functions, related data; deduced relativistic effects. Relativistic DWIA.

doi: 10.1103/PhysRevC.64.024614
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1999SA46      Nucl.Phys. A658, 13 (1999)

P.Sarriguren, E.Moya de Guerra, A.Escuderos

Shapes and β-Decay in Proton Rich Ge, Se, Kr and Sr Isotopes

NUCLEAR STRUCTURE ^64,66,68,70Ge, ^68,70,72,74Se, ^72,74,76,78Kr, ^76,78,80,82Sr; calculated pair gap parameters, Fermi energies, charge radii, quadrupole moments, deformation, Gamow-Teller strength distributions. Deformed self-consistent Hartree-Fock plus RPA approach.

doi: 10.1016/S0375-9474(99)00346-2
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1998SA21      Nucl.Phys. A635, 55 (1998)

P.Sarriguren, E.Moya de Guerra, A.Escuderos, A.C.Carrizo

β Decay and Shape Isomerism in ⁷⁴Kr

NUCLEAR STRUCTURE ⁷⁴Kr; calculated levels, J, π, Gamow-Teller strength distributions vs energy, deformation, T_1/2; deduced shape isomerism. Hartree-Fock plus RPA approach.

doi: 10.1016/S0375-9474(98)00158-4
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