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NSR database version of May 22, 2024.

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2021HA11      Phys.Lett. B 814, 136116 (2021)

I.Hamamoto

Deformed halo of 299F20

NUCLEAR STRUCTURE 29F; calculated neutron one-particle energies, deformed halo wave-functions using deformed Woods-Saxon potentials; deduced prolate deformation of the ground state.

doi: 10.1016/j.physletb.2021.136116
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2019HA09      Phys.Rev. C 99, 024319 (2019)

I.Hamamoto

Shape and shell structure of lighter (N ≤ 90) neutron-rich nuclei based on a phenomenological Woods-Saxon potential

NUCLEAR STRUCTURE N=10-60; N=40-90; calculated neutron one-particle energies in a spherically symmetric Woods-Saxon potential with N/Z=2.0 for N=10-60 nuclei, N/Z=1.7 and along the stability line for N=40-90 nuclei. 70Fe; calculated proton and neutron single particle energies as a function of quadrupole deformation β2. Phenomenological Woods-Saxon potential. Shape and shell structure of lighter neutron-rich nuclei away from the stability line in the context of N=20 and N=40 "islands of inversion" (IoI).

doi: 10.1103/PhysRevC.99.024319
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2019HA22      Phys.Rev. C 100, 014324 (2019)

I.Hamamoto

Enhanced E1 transition between weakly-bound excited states in the nucleus 27Ne

NUCLEAR STRUCTURE 27Ne; calculated B(E1) between the weakly-bound first and second excited states; deduced prolate deformed states. Discussed deformed halo arising from shell structure unique in weakly-bound or resonant neutrons. Shell structure of one-particle energy spectra in the axially symmetric quadrupole-deformed potential, using spherical one-body Woods-Saxon potential. Relevance to recently-reported experimental strong electric-dipole (E1) transition in 27Ne.

doi: 10.1103/PhysRevC.100.014324
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2017HA13      Phys.Rev. C 95, 044325 (2017)

I.Hamamoto

Examining possible neutron-halo nuclei heavier than 37Mg

NUCLEAR STRUCTURE 71,73,75Cr, 77Fe, 53Ar; calculated one-particle energies for neutrons, spherical halo, deformed halo, change of shell-structure, narrowed N=50 spherical energy gap for even-Z odd-N neutron-halo nuclei, weakly-bound neutrons. Shell structure with Woods-Saxon potentials.

doi: 10.1103/PhysRevC.95.044325
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2017HA32      Phys.Rev. C 96, 064312 (2017)

I.Hamamoto, H.Sagawa

Interplay between isoscalar and isovector correlations in neutron-rich nuclei

NUCLEAR STRUCTURE 22,24O; calculated isoscalar compression dipole (ISCD) and isovector dipole (IVD) strengths for 1- giant resonance as a function of excitation energy, radial transition densities. Self-consistent Hartree-Fock plus the random-phase approximation (RPA) with the Skyrme interaction, SLy4.

doi: 10.1103/PhysRevC.96.064312
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2016HA15      Phys.Rev. C 93, 054328 (2016)

I.Hamamoto

Shell structure of one-particle resonances in deformed potentials

NUCLEAR STRUCTURE 21C, 39Mg, 49Ti; calculated and analyzed one-neutron resonant levels, J, π and related one-neutron emission widths for prolate-deformed 39Mg and oblate-deformed 21C. Axially symmetric quadrupole deformation neglecting pair correlation. Comparison with available experimental data for 21C.

doi: 10.1103/PhysRevC.93.054328
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2014HA15      Phys.Rev. C 89, 057301 (2014)

I.Hamamoto

Oblate deformation of light neutron-rich even-even nuclei

NUCLEAR STRUCTURE 20C, 42Si; calculated one-particle energies for neutrons as a function of axially symmetric quadrupole deformation by solving the coupled differential equations; oblate shapes for ground states from Nilsson diagrams based on realistic Woods-Saxon potentials. 64,76Ni; possible candidates in A=70 region for oblate ground-state deformation.

doi: 10.1103/PhysRevC.89.057301
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2014HA30      Phys.Rev. C 90, 031302 (2014)

I.Hamamoto, H.Sagawa

Self-consistent Hartree-Fock and RPA Green's function method indicate no pygmy resonance in the monopole response of neutron-rich Ni isotopes

NUCLEAR STRUCTURE 68Ni; calculated monopole strength function (ISGMR) as a function of excitation energy, and the unperturbed particle-hole excitation strength using SLy4 interaction in the Hartree-Fock (HF) and the RPA Green's function methods.

doi: 10.1103/PhysRevC.90.031302
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2013HA20      Phys.Rev. C 88, 024327 (2013)

I.Hamamoto

Possible presence and properties of multi-chiral-pair bands in odd-odd nuclei with the same intrinsic configuration

NUCLEAR STRUCTURE 104,106Rh; calculated multi-chiral pair bands, triaxial shape for the presence of chiral pair bands, B(M1). Identification of chiral pair bands based on internal structure. Particle-rotor model.

doi: 10.1103/PhysRevC.88.024327
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2012HA21      Phys.Rev. C 85, 064329 (2012)

I.Hamamoto

Neutron shell structure and deformation in neutron-drip-line nuclei

NUCLEAR STRUCTURE 18C, 34Mg, 66Ti, 126Ru; calculated bound and resonant neutron one particle energies as a function of quadrupole deformation in neutron-drip nuclei using phenomenological Woods-Saxon potentials. Disappearance of N=28 magic number, possible disappearance of N=50 magic number, and presumable survival of N=82 magic number.

doi: 10.1103/PhysRevC.85.064329
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2011HA14      Int.J.Mod.Phys. E20, 373 (2011)

I.Hamamoto

Selection rule for electromagnetic transitions in nuclear chiral geometry

NUCLEAR STRUCTURE 126,128Cs, 132La, 134Pr; analyzed inter- and intra-bands; deduced selection rule. Comparison with experimental data.

doi: 10.1142/S0218301311017740
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2011ST06      Int.J.Mod.Phys. E20, 349 (2011)

K.Starosta, A.Chester, I.Hamamoto, T.Koike, J.Timar

Opportunities for collective model and chirality studies at TRIUMF

doi: 10.1142/S0218301311017715
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2010HA05      Phys.Rev. C 81, 021304 (2010)

I.Hamamoto

Interpretation of Coulomb breakup of 31Ne in terms of deformation

NUCLEAR STRUCTURE 31Ne; calculated coulomb breakup σ and neutron one-particle levels as a function of quadrupole deformation parameter using the Woods-Saxon potential. Calculated contribution of different Nilsson orbits, interpretation of ground state in terms of p-wave neutron halo structure and deformed 30Ne core.

doi: 10.1103/PhysRevC.81.021304
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2010HA07      J.Phys.(London) G37, 055102 (2010)

I.Hamamoto

Change of shell structure and magnetic moments of odd-N deformed nuclei towards the neutron drip line

NUCLEAR STRUCTURE 11Be, 15,17C, 31,33Mg, 41Si, 45S; calculated magnetic dipole moments, neutron one-particle levels as a function of axially symmetric quadrupole deformation. Deformed Woods-Saxon potentials.

doi: 10.1088/0954-3899/37/5/055102
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2010YO01      Phys.Rev.Lett. 104, 129201 (2010)

D.T.Yordanov, K.Blaum, M.De Rydt, M.Kowalska, R.Neugart, G.Neyens, I.Hamamoto

Comment on "Intruder Configurations in the A=33 Isobars: 33Mg and 33Al"

NUCLEAR STRUCTURE 33Mg, 33Al; calculated magnetic moments; deduced 33Mg π. Comparison with experimental data.

doi: 10.1103/PhysRevLett.104.129201
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2009HA02      Phys.Rev. C 79, 014307 (2009)

I.Hamamoto

One-particle properties of deformed N ≈ 28 odd-N nuclei with weakly bound or resonant neutrons

NUCLEAR STRUCTURE 43S, 45S, 39Mg, 52Cr; calculated levels, J, π, magnetic moments using Schrodinger equation, Nilsson diagrams, and deformed Woods-Saxon potential.

doi: 10.1103/PhysRevC.79.014307
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2009HA08      Phys.Rev. C 79, 034317 (2009)

I.Hamamoto, B.R.Mottelson

Further examination of prolate-shape dominance in nuclear deformation

doi: 10.1103/PhysRevC.79.034317
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2009HA33      Phys.Rev. C 80, 041304 (2009); Publishers Note, Phys.Rev. C 80, 059901 (2009)

D.J.Hartley, R.V.F.Janssens, L.L.Riedinger, M.A.Riley, A.Aguilar, M.P.Carpenter, C.J.Chiara, P.Chowdhury, I.G.Darby, U.Garg, Q.A.Ijaz, F.G.Kondev, S.Lakshmi, T.Lauritsen, A.Ludington, W.C.Ma, E.A.McCutchan, S.Mukhopadhyay, R.Pifer, E.P.Seyfried, I.Stefanescu, S.K.Tandel, U.Tandel, J.R.Vanhoy, X.Wang, S.Zhu, I.Hamamoto, S.Frauendorf

Wobbling mode in 167Ta

NUCLEAR REACTIONS 120Sn(51V, 4n), E=235 MeV; measured Eγ, Iγ, γγ-coin and γγ(θ) using Gammasphere array. 167Ta; deduced levels, J, π, triaxial superdeformed bands, normal deformed bands, dynamic moments of inertia, alignments and rotational frequency. Comparison with ultimate cranked (UC) calculations.

doi: 10.1103/PhysRevC.80.041304
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2009VA06      Phys.Rev.Lett. 102, 242502 (2009)

J.J.Valiente-Dobon, D.Mengoni, A.Gadea, E.Farnea, S.M.Lenzi, S.Lunardi, A.Dewald, Th.Pissulla, S.Szilner, R.Broda, F.Recchia, A.Algora, L.Angus, D.Bazzacco, G.Benzoni, P.G.Bizzeti, A.M.Bizzeti-Sona, P.Boutachkov, L.Corradi, F.Crespi, G.de Angelis, E.Fioretto, A.Gorgen, M.Gorska, A.Gottardo, E.Grodner, B.Guiot, A.Howard, W.Krolas, S.Leoni, P.Mason, R.Menegazzo, D.Montanari, G.Montagnoli, D.R.Napoli, A.Obertelli, T.Pawlat, B.Rubio, E.Sahin, F.Scarlassara, R.Silvestri, A.M.Stefanini, J.F.Smith, D.Steppenbeck, C.A.Ur, P.T.Wady, J.Wrzesinski, E.Maglione, I.Hamamoto

Lifetime Measurements of the Neutron-Rich N = 30 Isotones 50Ca and 51Sc: Orbital Dependence of Effective Charges in the fp Shell

NUCLEAR REACTIONS 208Pb(48Ca, 50Ca), (48Ca, 51Sc), E=310 MeV; measured Eγ, Iγ, half-lives for first excited states using DSAM. 50Ca, 51Sc; deduced B(E2).

doi: 10.1103/PhysRevLett.102.242502
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2008HA16      Phys.Rev. C 77, 054311 (2008)

I.Hamamoto

Neutron decay width of one-particle resonant levels in deformed nuclei

NUCLEAR STRUCTURE 13Be; calculated neutron decay widths, wave functions of one-particle resonant levels. Woods-Saxon potential used.

doi: 10.1103/PhysRevC.77.054311
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2007HA50      J.Phys.(London) G34, 2715 (2007)

I.Hamamoto, S.Shimoura

Properties of 12Be and 11Be in terms of single-particle motion in deformed potential

NUCLEAR STRUCTURE 11,12Be; calculated level energies, B(E0), B(E2), and deformation parameters. Compared results to available data.

doi: 10.1088/0954-3899/34/12/015
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2007HA53      Phys.Rev. C 76, 054319 (2007)

I.Hamamoto

Nilsson diagrams for light neutron-rich nuclei with weakly-bound neutrons

NUCLEAR STRUCTURE 15,17,19C, 31,33,35,37Mg; calculated one-particle bound and resonant level energies. Deduced Nilsson diagrams using Woods-Saxon potential.

doi: 10.1103/PhysRevC.76.054319
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2007HA56      Eur.Phys.J. Special Topics 150, 123 (2007)

I.Hamamoto

Resonant and weakly-bound one-particle levels in quadrupole-deformed potentials

doi: 10.1140/epjst/e2007-00283-7
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2007SH34      Phys.Lett. B 654, 87 (2007)

S.Shimoura, S.Ota, K.Demichi, N.Aoi, H.Baba, Z.Elekes, T.Fukuchi, T.Gomi, K.Hasegawa, E.Ideguchi, M.Ishihara, N.Iwasa, H.Iwasaki, S.Kanno, S.Kubono, K.Kurita, M.Kurokawa, Y.U.Matsuyama, S.Michimasa, K.Miller, T.Minemura, T.Motobayashi, T.Murakami, M.Notani, A.Odahara, A.Saito, H.Sakurai, E.Takeshita, S.Takeuchi, M.Tamaki, T.Teranishi, K.Yamada, Y.Yanagisawa, I.Hamamoto

Lifetime of the isomeric 0+2 state in 12Be

NUCLEAR REACTIONS 9Be(18O, X)12Be, E=100 MeV/nucleon; measured delayed Eγ, Iγ, γγ-coin. 12Be deduced isomeric state energy J, π, T1/2, decay branching, B(E2), B(E0). Comparison with shell model calculations.

doi: 10.1016/j.physletb.2007.08.053
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2006FU15      Phys.Scr. T125, 194 (2006)

Y.Fujita, I.Hamamoto, H.Fujita, Y.Shimbara, T.Adachi, G.P.A.Berg, K.Fujita, K.Hatanaka, J.Kamiya, K.Nakanishi, Y.Sakemi, Y.Shimizu, M.Uchida, T.Wakasa, M.Yosoi

Identification of the [202]3/2 deformed band in mirror nuclei 25Mg and 25Al and implications for unstable nuclei

NUCLEAR REACTIONS 25Mg(3He, t), E=140 MeV/nucleon; measured triton spectra, σ(θ=0°). 25Al deduced levels, J, π, B(GT), rotational band. Comparison with mirror states in 25Mg.

doi: 10.1088/0031-8949/2006/T125/047
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2006HA16      Phys.Rev. C 73, 044317 (2006)

I.Hamamoto

Pair correlation in deformed neutron-drip-line nuclei: The eigenphase formalism and asymptotic behavior

doi: 10.1103/PhysRevC.73.044317
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2006HA24      Phys.Rev. C 73, 064308 (2006)

I.Hamamoto

Positive-energy one-particle levels in quadrupole-deformed Woods-Saxon potentials

doi: 10.1103/PhysRevC.73.064308
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2006HA31      J.Phys.(London) G32, 1105 (2006)

I.Hamamoto, H.Sagawa, X.-R.Zhou

Weakly bound neutrons and quadrupole response function in the many-body pair correlation of neutron drip line nuclei

NUCLEAR STRUCTURE 84Ni; calculated quasiparticle energies, quadrupole response function. Simplified HFB equation, surface-type and volume-type pairing.

doi: 10.1088/0954-3899/32/8/003
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2006PE07      Phys.Rev.Lett. 96, 112502 (2006)

C.M.Petrache, G.B.Hagemann, I.Hamamoto, K.Starosta

Risk of Misinterpretation of Nearly Degenerate Pair Bands as Chiral Partners in Nuclei

NUCLEAR STRUCTURE 134Pr, 136Pm; analyzed rotational bands energies, B(E2), related features; deduced insufficient evidence for chiral partner bands.

doi: 10.1103/PhysRevLett.96.112502
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2006ST26      Phys.Scr. T125, 18 (2006)

K.Starosta, I.Hamamoto, T.Koike, C.Vaman

Electromagnetic properties of nuclear chiral partners

NUCLEAR STRUCTURE 134Pr; analyzed levels, J, π, B(M1)/B(E2), chiral partner bands. 128Cs, 132La; analyzed chiral partner bands B(E2), B(M1).

doi: 10.1088/0031-8949/2006/T125/004
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2005HA11      Phys.Rev. C 71, 037302 (2005)

I.Hamamoto

Effective pair gap of weakly bound neutrons in deformed nuclei

doi: 10.1103/PhysRevC.71.037302
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2005HA44      Phys.Rev. C 72, 024301 (2005)

I.Hamamoto

One-particle resonant levels in a deformed potential

doi: 10.1103/PhysRevC.72.024301
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2004FU02      Phys.Rev.Lett. 92, 062502 (2004)

Y.Fujita, I.Hamamoto, H.Fujita, Y.Shimbara, T.Adachi, G.P.A.Berg, K.Fujita, K.Hatanaka, J.Kamiya, K.Nakanishi, Y.Sakemi, Y.Shimizu, M.Uchida, T.Wakasa, M.Yosoi

Evidence for the Existence of the [2 0 2]3/2 Deformed Band in Mirror Nuclei 25Mg and 25Al

NUCLEAR REACTIONS 25Mg(3He, t), E=140 MeV/nucleon; measured triton spectra, σ(θ=0°). 25Al deduced levels, J, π, B(GT), rotational band. Comparison with mirror states in 25Mg.

doi: 10.1103/PhysRevLett.92.062502
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2004HA07      Nucl.Phys. A731, 211 (2004)

I.Hamamoto

Shell-structure and pair-correlation in nuclei close to the neutron drip line

doi: 10.1016/j.nuclphysa.2003.11.033
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2004HA23      Phys.Rev. C 69, 041306 (2004)

I.Hamamoto

Dominance of low-l component in weakly bound deformed single-neutron orbits

doi: 10.1103/PhysRevC.69.041306
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2004HA37      Phys.Rev. C 69, 064302 (2004)

I.Hamamoto, B.R.Mottelson

Weakly bound s1/2 neutrons in the many-body pair correlation of neutron drip line nuclei

doi: 10.1103/PhysRevC.69.064302
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2004HA44      Phys.Rev. C 70, 034317 (2004)

I.Hamamoto, H.Sagawa

Weakly bound p3/2 neutrons and spin-response function in the many-body pair correlation of neutron drip line nuclei

doi: 10.1103/PhysRevC.70.034317
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2004JE03      Eur.Phys.J. A 19, 173 (2004)

D.R.Jensen, G.B.Hagemann, I.Hamamoto, B.Herskind, G.Sletten, J.N.Wilson, S.W.Odegard, K.Spohr, H.Hubel, P.Bringel, A.Neusser, G.Schonwasser, A.K.Singh, W.C.Ma, H.Amro, A.Bracco, S.Leoni, G.Benzoni, A.Maj, C.M.Petrache, G.Lo Bianco, P.Bednarczyk, D.Curien

Coexisting wobbling and quasiparticle excitations in the triaxial potential well of 163Lu

NUCLEAR REACTIONS 139La(29Si, 5n), E=157 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, configurations, triaxial superdeformed bands. Euroball array.

doi: 10.1140/epja/i2003-10120-5
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2004KO55      Phys.Rev.Lett. 93, 172502 (2004)

T.Koike, K.Starosta, I.Hamamoto

Chiral Bands, Dynamical Spontaneous Symmetry Breaking, and the Selection Rule for Electromagnetic Transitions in the Chiral Geometry

NUCLEAR STRUCTURE 130Cs; calculated levels, J, π, B(E2), B(M1), degenerate chiral rotational bands, selection rule.

doi: 10.1103/PhysRevLett.93.172502
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2004SH02      Eur.Phys.J. A 19, 25 (2004)

Y.Shimbara, Y.Fujita, T.Adachi, G.P.A.Berg, H.Fujita, K.Fujita, I.Hamamoto, K.Hatanaka, J.Kamiya, K.Nakanishi, Y.Sakemi, Y.Shimizu, M.Uchida, T.Wakasa, M.Yosoi

Suppression of Gamow-Teller, M1 transitions in deformed mirror nuclei 25Mg and 25Al

NUCLEAR REACTIONS 25Mg(3He, t), E=140 MeV/nucleon; measured triton spectra; deduced Gamow-Teller and magnetic dipole transition strength distributions.

doi: 10.1140/epja/i2003-10115-2
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2003HA02      Phys.Rev. C 67, 014319 (2003)

I.Hamamoto, G.B.Hagemann

Quantized wobbling excitations with alignments

NUCLEAR STRUCTURE 163Lu; calculated level energies, B(E2), wobbling mode features for triaxial, strongly-deformed rotational bands.

doi: 10.1103/PhysRevC.67.014319
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2003HA27      Phys.Rev. C 68, 034312 (2003)

I.Hamamoto, B.R.Mottelson

Pair correlation in neutron drip line nuclei

doi: 10.1103/PhysRevC.68.034312
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2003HA38      Nucl.Phys. A722, 389c (2003)

I.Hamamoto

Nuclear wobbling-phonon excitations with alignments

NUCLEAR STRUCTURE 163Lu; calculated rotational band energies, B(E2), wobbling mode.

doi: 10.1016/S0375-9474(03)01395-2
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2003HA54      C.R.Physique 4, 433 (2003)

I.Hamamoto, B.R.Mottelson

A personal view of some issues involved in the structure of nuclei with large neutron excess

doi: 10.1016/S1631-0705(3)00059-8
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2002FU17      Phys.Rev. C66, 044313 (2002)

Y.Fujita, Y.Shimbara, I.Hamamoto, T.Adachi, G.P.A.Berg, H.Fujimura, H.Fujita, J.Gorres, K.Hara, K.Hatanaka, J.Kamiya, T.Kawabata, Y.Kitamura, Y.Shimizu, M.Uchida, H.P.Yoshida, M.Yoshifuku, M.Yosoi

M1 and Gamow-Teller transitions in T = 1/2 nuclei 23Na and 23Mg

NUCLEAR REACTIONS 23Na(3He, t), E=140 MeV/nucleon; measured triton spectra, σ(θ=0°). 23Na, 23Mg deduced Gamow-Teller transition strengths, B(M1), orbital contributions. Particle-rotor model. Astrophysical implications discussed.

NUCLEAR STRUCTURE 23Na, 23Mg; analyzed M1 and Gamow-Teller transition strengths; deduced orbital contributions, related features.

doi: 10.1103/PhysRevC.66.044313
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2002HA16      Eur.Phys.J. A 13, 21 (2002)

I.Hamamoto

Properties Unique in Nuclei Far from β Stability Line

doi: 10.1007/s10050-002-8712-6
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2002HA19      Phys.Rev. C65, 044305 (2002)

I.Hamamoto

Wobbling Excitations in Odd-A Nuclei with High-j Aligned Particles

doi: 10.1103/PhysRevC.65.044305
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2002HA44      Phys.Rev. C66, 044315 (2002)

I.Hamamoto, H.Sagawa

Isoscalar dipole strength in 82208Pb126: The spurious mode and the strength in the continuum

NUCLEAR STRUCTURE 208Pb; calculated isoscalar dipole strength distribution; deduced spurious component, related features. Schematic harmonic-oscillator model.

doi: 10.1103/PhysRevC.66.044315
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2002HA58      Prog.Theor.Phys.(Kyoto), Suppl. 146, 143 (2002)

I.Hamamoto

Shape, Shell Structure and Collective Modes Unique to Nuclei Far from Stability Line

NUCLEAR STRUCTURE 60Ca; calculated single-particle level energies, octupole strength distributions.

doi: 10.1143/PTPS.146.143
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2002JE05      Nucl.Phys. A703, 3 (2002)

D.R.Jensen, G.B.Hagemann, I.Hamamoto, S.W.Odegard, M.Bergstrom, B.Herskind, G.Sletten, S.Tormanen, J.N.Wilson, P.O.Tjom, K.Spohr, H.Hubel, A.Gorgen, G.Schonwasser, A.Bracco, S.Leoni, A.Maj, C.M.Petrache, P.Bednarczyk, D.Curien

Wobbling Phonon Excitations, Coexisting with Normal Deformed Structures in 163Lu

NUCLEAR REACTIONS 139La(29Si, 5n), E=152 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, configurations, B(M1)/B(E2), triaxial superdeformed bands, wobbling modes. Euroball IV array, particle-rotor calculations.

doi: 10.1016/S0375-9474(01)01459-2
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2002JE10      Phys.Rev.Lett. 89, 142503 (2002)

D.R.Jensen, G.B.Hagemann, I.Hamamoto, S.W.Odegard, B.Herskind, G.Sletten, J.N.Wilson, K.Spohr, H.Hubel, P.Bringel, A.Neusser, G.Schonwasser, A.K.Singh, W.C.Ma, H.Amro, A.Bracco, S.Leoni, G.Benzoni, A.Maj, C.M.Petrache, G.Lo Bianco, P.Bednarczyk, D.Curien

Evidence for Second-Phonon Nuclear Wobbling

NUCLEAR REACTIONS 139La(29Si, 5n), E=157 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, δ, superdeformed bands, B(M1), B(E2), wobbling excitation mode. Euroball IV array.

doi: 10.1103/PhysRevLett.89.142503
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2001HA10      Nucl.Phys. A683, 255 (2001)

I.Hamamoto, S.V.Lukyanov, X.Z.Zhang

Kinetic Energy and Spin-Orbit Splitting in Nuclei Near Neutron Drip Line

doi: 10.1016/S0375-9474(00)00443-7
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2001HA27      Nucl.Phys. A687, 9c (2001)

I.Hamamoto

Giant Resonances of Nuclei Far from β Stability Lines vs. β Stable Nuclei

NUCLEAR STRUCTURE 60Ca; calculated single particle levels, wave functions, quadrupole giant resonance strength distributions. Hartree-Fock, RPA methods, spin-orbit term discussed.

doi: 10.1016/S0375-9474(01)00594-2
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2001HA45      Phys.Rev. C64, 024313 (2001)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Shape, Shell Structure, and Low-Lying Strong Octupole Strength in 2060Ca40

NUCLEAR STRUCTURE 60Ca, 68Ni, 80Zr; calculated levels, J, π, octupole strength distributions. Self-consistent Hartree-Fock, RPA, Skyrme interactions.

doi: 10.1103/PhysRevC.64.024313
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2001HA54      Acta Phys.Pol. B32, 2545 (2001)

I.Hamamoto, S.W.Odegard, G.B.Hagemann, D.R.Jensen, M.Bergstrom, B.Herskind, G.Sletten, S.Tormanen, J.N.Wilson, P.O.Tjom, K.Spohr, H.Hubel, A.Gorgen, G.Schonwasser, A.Bracco, S.Leoni, A.Maj, C.M.Petrache, P.Bednarczyk, D.Curien

First Evidence for the Wobbling Mode in a Triaxial Superdeformed Odd-A Nucleus

NUCLEAR REACTIONS 139La(29Si, 5n), E=152 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, triaxial superdeformed band, B(M1)/B(E2), wobbling mode. Euroball IV array. Particle-rotor model calculations.


2001OD02      Nucl.Phys. A682, 427c (2001)

S.W.Odegard, G.B.Hagemann, M.Bergstrom, B.Herskind, D.R.Jensen, G.Sletten, S.Tormanen, J.Wilson, P.O.Tjom, K.Spohr, H.Hubel, A.Gorgen, G.Schonwasser, A.Bracco, S.Leoni, A.Maj, C.Petrache, P.Bednarczyk, D.Curien, I.Hamamoto

Search for the Wobbling Mode Built on Triaxial Super Deformation

NUCLEAR REACTIONS 139La(29Si, 5n), E=152 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, triaxial superdeformed bands, B(M1)/B(E2), possible wobbling mode. Euroball IV array. Cranked mean-field calculations.

doi: 10.1016/S0375-9474(00)00669-2
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2001OD03      Phys.Rev.Lett. 86, 5866 (2001)

S.W.Odegard, G.B.Hagemann, D.R.Jensen, M.Bergstrom, B.Herskind, G.Sletten, S.Tormanen, J.N.Wilson, P.O.Tjom, I.Hamamoto, K.Spohr, H.Hubel, A.Gorgen, G.Schonwasser, A.Bracco, S.Leoni, A.Maj, C.M.Petrache, P.Bednarczyk, D.Curien

Evidence for the Wobbling Mode in Nuclei

NUCLEAR REACTIONS 139La(29Si, 5n), E=152 MeV; measured Eγ, Iγ, γγ-coin. 163Lu deduced high-spin levels, J, π, configurations, transitions B(E2), B(M1), wobbling mode. Euroball IV array. Particle-rotor model calculations.

doi: 10.1103/PhysRevLett.86.5866
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2001UR04      Phys.Rev. C64, 054304 (2001)

P.Urkedal, X.Z.Zhang, I.Hamamoto

Low-Lying Appreciable Gamow-Teller Strength in Deformed Neutron-Rich Nuclei

NUCLEAR STRUCTURE 100,102,104,106,108,110Sr, 102,104,106,108,110,112Zr, 104,106,108,110,112Mo, 106,108,110,112,114Ru, 110,112,114,116Pd, 158,160,162,164,166Gd, 160,162,164,166,168Dy, 162,164,166,168,170,172,174Er, 164,166,168,170,172,174,176,178Yb, 170,172,174,176,178,180,182Hf, 176,178,180,182,184W; calculated pair-correlation parameters, quadrupole moments, deformation. 108Mo, 160Gd, 162,164Dy, 170Er, 176Yb, 178Hf; calculated Gamow-Teller strength distributions. 160Gd, 164Dy, 170Er, 176Yb; deduced appreciable low-lying Gamow-Teller strength. Skyrme-Hartree-Fock calculations, Tamm-Dancoff approximation, RPA.

doi: 10.1103/PhysRevC.64.054304
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2000HA36      Phys.Rev. C62, 024318 (2000)

I.Hamamoto, B.A.Brown

Polarization Associated with the Coupling to Isoscalar Dipole Compression Mode

NUCLEAR STRUCTURE 208Pb; calculated one-particle isoscalar dipole moments, role of coupling with isoscalar GDR.

doi: 10.1103/PhysRevC.62.024318
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2000HA37      Phys.Rev. C62, 024319 (2000)

I.Hamamoto, H.Sagawa

Charge-Exchange Spin Monopole Modes

NUCLEAR STRUCTURE 48Ca, 90Zr, 208Pb; calculated charge-exchange spin monopole response functions. Hartree-Fock plus TDA.

doi: 10.1103/PhysRevC.62.024319
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1999HA09      Nucl.Phys. A648, 203 (1999)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Displacement Fields of Excited States in Stable and Neutron Drip-Line Nuclei

NUCLEAR STRUCTURE 11Be, 60Ca, 208Pb; calculated multipole excitation modes transition densities, displacement fields. Self-consistent Hartree-Fock plus RPA.

doi: 10.1016/S0375-9474(99)00024-X
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1999HA28      Phys.Rev. C60, 011305 (1999)

I.Hamamoto

Gamow-Teller β+ Decays of Deformed N ≈ Z Sr Isotopes Close to the Proton Drip Line

NUCLEAR STRUCTURE 75,76Sr; calculated Gamow-Teller strength for β+ decay; deduced dependence on deformation, neutron-proton interaction.

doi: 10.1103/PhysRevC.60.011305
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1999HA44      Phys.Rev. C60, 031303 (1999)

I.Hamamoto

Neutron-Proton Ratio of Collective Excitations

doi: 10.1103/PhysRevC.60.031303
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1999HA57      Phys.Rev. C60, 054320 (1999)

I.Hamamoto

Anharmonicity of Giant Resonances

doi: 10.1103/PhysRevC.60.054320
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1999HA61      Phys.Rev. C60, 064314 (1999)

I.Hamamoto, H.Sagawa

Response of Light Drip Line Nuclei to Spin Dependent Operators

NUCLEAR STRUCTURE 8,10,12,14,16,18,20,22C; calculated single-particle level energies. 8He, 8,22C; calculated M1, spin, orbital strength distributions. Self-consistent Hartree-Fock, RPA with Skyrme interactions.

doi: 10.1103/PhysRevC.60.064314
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1999SA22      Nucl.Phys. A649, 319c (1999)

H.Sagawa, I.Hamamoto, X.Z.Zhang

A Microscopic Study of Giant Resonances in Nuclei Near Drip Lines

NUCLEAR STRUCTURE 208Pb, 34,40,48,60Ca; calculated giant monopole resonance strength distributions. 100Sn; calculated core polarization charges, B(E2). 90Zr, 100Sn; calculated neutron, proton effective charges. Self-consistent Hartree-Fock plus RPA model.

doi: 10.1016/S0375-9474(99)00094-9
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1998HA09      Phys.Rev. C57, R1064 (1998)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Isoscalar and Isovector Dipole Mode in Drip Line Nuclei in Comparison with β-Stable Nuclei

NUCLEAR STRUCTURE 22C, 28O, 34,40,60Ca, 208Pb; calculated isoscalar, isovector dipole strength vs excitation energy; deduced giant resonance features. Hartree-Fock plus RPA calculations, Skyrme interactions.

doi: 10.1103/PhysRevC.57.R1064
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1998HA39      J.Phys.(London) G24, 1417 (1998)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Collective Modes of Nuclei Far from β-Stability Line

NUCLEAR STRUCTURE 28O, 34Ca, 100Sn, 208Pb; calculated isoscalar, isovector dipole strength distributions.

doi: 10.1088/0954-3899/24/8/016
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1998HA60      Phys.Rev. C58, 3388 (1998)

I.Hamamoto, X.Z.Zhang

Coupling of Particles Near Threshold to Shape Oscillations

doi: 10.1103/PhysRevC.58.3388
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1998SA28      J.Phys.(London) G24, 1445 (1998)

H.Sagawa, I.Hamamoto, X.Z.Zhang

Giant Monopole States in Nuclei Near Drip Lines

NUCLEAR STRUCTURE 34,40,48,60Ca, 208Pb; calculated isocalar, isovector monopole strength distributions. Hartree-Fock plus RPA model.

doi: 10.1088/0954-3899/24/8/019
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1998UR03      Phys.Rev. C58, R1889 (1998)

P.Urkedal, I.Hamamoto

Deformation and One-Particle Orbits in 3671Kr35 and 3571Br36

NUCLEAR STRUCTURE 72Kr; calculated single-particle levels, deformation. 71Br, 71Kr; analyzed decay data, Gamow-Teller strengths; deduced deformations, levels J, π. Hartree-Fock calculations.

doi: 10.1103/PhysRevC.58.R1889
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1997HA17      Phys.Lett. 394B, 1 (1997)

I.Hamamoto, H.Sagawa

Electric Quadrupole Polarization Charges in Proton Drip Line Nuclei

NUCLEAR STRUCTURE 48Ni, 100Sn; calculated isoscalar, isovector quadrupole strength function, nucleon polarization charges, B(E2). Hartree-Fock with Skyrme interactions, RPA solved in coordinate space with the Green's function method.

doi: 10.1016/S0370-2693(96)01657-7
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1997HA20      Phys.Rev. C55, 2361 (1997)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Structure of Giant Quadrupole Resonances in Neutron Drip Line Nuclei

NUCLEAR STRUCTURE 28O; 48Ca; calculated isoscalar GQR associated radial transition density, strength function. Self-consistent Hartree-Fock plus RPA, Skyrme interaction.

doi: 10.1103/PhysRevC.55.2361
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1997HA55      Nucl.Phys. A626, 669 (1997)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Quadrupole Strength Function and Core Polarization in Drip Line Nuclei

NUCLEAR STRUCTURE 28O, 34,40,60Ca, 48Ni, 48Ca; calculated isoscalar, isovector quadrupole RPA strength functions, polarizations. Self-consistent Hartree-Fock calculations, Skyrme interactions.

doi: 10.1016/S0375-9474(97)00478-8
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1997HA57      Phys.Rev. C56, 3121 (1997)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Giant Monopole Resonances in Nuclei Near Stable and Drip Lines

NUCLEAR STRUCTURE 34,40,48,60Ca, 90Zr, 208Pb; calculated giant monopole strength distributions, related features. Hartree-Fock, RPA calculations, Skyrme interactions.

doi: 10.1103/PhysRevC.56.3121
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1997RO13      Nucl.Phys. A624, 225 (1997)

C.Rossi Alvarez, C.M.Petrache, D.R.Napoli, D.Bazzacco, S.Lunardi, N.H.Medina, R.Menegazzo, P.Pavan, R.Venturelli, C.Fahlander, I.Hamamoto

Decay Out of the Highly Deformed Bands in the N = 75 Isotones 137Sm and 139Gd

NUCLEAR REACTIONS 104Pd(37Cl, 3np), E=172 MeV; 92Mo(50Cr, n2p), E=220 MeV; measured Eγ, Iγ, γγ-coin. 137Sm, 139Gd deduced high-spin levels, J, π, band structure, configuration, deformation features.

doi: 10.1016/S0375-9474(97)81836-2
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1996HA02      Phys.Rev. C53, 765 (1996)

I.Hamamoto, H.Sagawa, X.Z.Zhang

Single-Particle and Collective Properties of Drip-Line Nuclei

NUCLEAR STRUCTURE 110Ni, 100,120Sn, 120Sr; calculated Hartree-Fock density, Hartree-Fock potential vs r. 110Ni, 100Sn; calculated isoscalar, isovector monopole, isovector dipole, isoscalar quadrupole modes strength functions. Hartree-Fock with Skyrme interactions, RPA.

doi: 10.1103/PhysRevC.53.765
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1996HA10      Phys.Rev. C53, R1492 (1996)

I.Hamamoto, H.Sagawa

Low Energy Strength in Low-Multipole Response Function of Nuclei Near the Neutron Drip Line

NUCLEAR STRUCTURE 28O; calculated Hartree-Fock single-particle energies, <r2>, <r4>, isoscalar, isovector monopole, isovector dipole transition strength function. Hartree-Fock plus RPA with Skyrme interaction.

doi: 10.1103/PhysRevC.53.R1492
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1996HA36      Phys.Rev. C54, 2369 (1996)

I.Hamamoto, H.Sagawa

Core Polarization Charges of Quadrupole Transitions in Neutron Drip Line Nuclei

NUCLEAR STRUCTURE 28O; calculated isoscalar, isovector quadrupole mode strength function, single nucleon core polarization charges, B(λ), radial transition densities. Particle-vibration coupling model, Hartree-Fock single particle wave functions, RPA response functions.

doi: 10.1103/PhysRevC.54.2369
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1995DO08      Phys.Lett. 345B, 181 (1995)

J.Dobaczewski, I.Hamamoto

Isospin Impurities in Ground States of N = Z Nuclei Near the Proton-Drip Line

NUCLEAR STRUCTURE 56Ni, 64Ge, 76Sr, 80Zr, 100Sn; calculated isospin mixing probabilities. Deformed Hartree-Fock solutions, Skyrme interaction.

doi: 10.1016/0370-2693(94)01634-O
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1995FR19      Phys.Rev. C52, 2468 (1995)

F.Frisk, I.Hamamoto, X.Z.Zhang

Gamow-Teller β+ Decay of Deformed Nuclei Near the Proton Drip Line

NUCLEAR STRUCTURE Z=28-66; calculated β+-decay associated Gamow-Teller transition strength. Deformed Hartree-Fock based quasiparticle TDA, Skyrme interactions.

doi: 10.1103/PhysRevC.52.2468
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1995HA30      Phys.Rev. C52, R2326 (1995)

I.Hamamoto, X.Z.Zhang

Neutron Skin of Nuclei Near the Neutron Drip Line

NUCLEAR STRUCTURE 152Dy; analyzed Hartree-Fock minima density distribution at superdeformed shape. A=152; A=178; A=208; calculated one-neutron levels vs N=78-110, 94-126, 118-142 respectively; deduced neutron skin related features. Skyrme type deformed Hartree-Fock calculations.

doi: 10.1103/PhysRevC.52.R2326
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1995HA36      Phys.Scr. T56, 27 (1995)

I.Hamamoto, B.Mottelson

ΔI = 4 Structure in Superdeformed Rotational Band - Deformation with C(4v)

NUCLEAR STRUCTURE A=120; A=100; A=90; analyzed yrast quartet splittings for C(4v) Hamiltonian, other aspects, superdeformed bands; deduced ΔI=4 structure related features, model parameters characteristics.

doi: 10.1088/0031-8949/1995/T56/004
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1995HA39      Z.Phys. A353, 145 (1995)

I.Hamamoto, X.Z.Zhang

Dependence of Gamow-Teller β+-Decay of 80Zr, 76Sr and 72Kr on Nuclear Shape

NUCLEAR STRUCTURE 80Zr, 76Sr, 72Kr; calculated Gamow-Teller β+-decay probability. Skyrme-type deformed Hartree-Fock calculation based quasiparticle TDA.

doi: 10.1007/BF01295892
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1994DO02      Phys.Rev.Lett. 72, 981 (1994)

J.Dobaczewski, I.Hamamoto, W.Nazarewicz, J.A.Sheikh

Nuclear Shell Structure at Particle Drip Lines

NUCLEAR STRUCTURE 100Sn, 100Zn; calculated nucleon densities, central potentials radial dependences. A=120; calculated single particles levels for isobars. Self-consistent mean-field theory.

doi: 10.1103/PhysRevLett.72.981
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1994DO19      Acta Phys.Pol. B25, 541 (1994)

J.Dobaczewski, I.Hamamoto, W.Nazarewicz, J.A.Sheikh

Nuclear Structure at Particle Drip Lines

NUCLEAR STRUCTURE 100,118,132,150Sn; calculated single particle nucleonic densities. A=100, 120, 150; calculated single particle levels. A=94-110; calculated Q(EC) for Ru, PD, Cd, Sn isotopes. 76,78,80,82Sr; calculated levels. Mean field approach.


1994FR20      Phys.Scr. 50, 628 (1994)

H.Frisk, I.Hamamoto, F.R.May

Quadrupole-Octupole Deformation in Finite Fermion System

NUCLEAR STRUCTURE N=138-186; analyzed quadrupole-octupole deformation features; deduced nonaxially-symmetric Y33 deformation superposed on prolate or oblate deformation role. Two-level, modified oscillator models.

doi: 10.1088/0031-8949/50/6/005
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1994HA13      Phys.Rev. C49, 2489 (1994)

I.Hamamoto, W.Nazarewicz

K(π) = 1+ Pairing Interaction and Moments of Inertia of Superdeformed Rotational Bands in Atomic Nuclei

NUCLEAR STRUCTURE 194Hg; calculated Migdal to cranking moment of inertia ratio; deduced K(π)=1+ pairing role on moments of inertia frequency dependence at superdeformed shapes.

doi: 10.1103/PhysRevC.49.2489
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1994HA18      Phys.Rev. C49, 3352 (1994)

I.Hamamoto, W.Nazarewicz

Comment on ' Orbital M1 Versus E2 Strength in Deformed Nuclei: A new energy-weighted sum rule '

doi: 10.1103/PhysRevC.49.3352
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1994HA22      Phys.Lett. 324B, 273 (1994)

I.Hamamoto, S.Mizutori

Dynamical Moments of Inertia at Normal Deformation in Neighbouring Odd and Even-Even Nuclei

NUCLEAR STRUCTURE 157,159,161,163Ho, 159,161,163,165,167,169Tm, 163,165,167,169,171,173,175Lu, 171,173,175,177,179,181Ta, 177,179,181,183,185Re; calculated dynamical moments of inertia fractional changes. Cranking HFB calculations.

doi: 10.1016/0370-2693(94)90193-7
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1994HA39      Nucl.Phys. A577, 19c (1994)

I.Hamamoto

Beta Decay to Gamow-Teller Giant Resonances in Drip-Line Nuclei

NUCLEAR STRUCTURE 8He, 14,20,22C; calculated Gamow-Teller β-decay strength. 14,20,22C, 8He, 22,24,28O; calculated Gamow-Teller ground state, IAS energies. Hartree-Fock plus RPA.

doi: 10.1016/0375-9474(94)90828-1
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1994HA46      Phys.Lett. 333B, 294 (1994)

I.Hamamoto, B.Mottelson

Superdeformed Rotational Bands in the Presence of Y44 Deformation

doi: 10.1016/0370-2693(94)90144-9
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1994NA09      Nucl.Phys. A573, 333 (1994)

T.Nakatsukasa, K.Matsuyanagi, I.Hamamoto, W.Nazarewicz

Low-Energy M1 and E3 Excitations in the Proton-Rich Kr-Zr Region

NUCLEAR STRUCTURE 76,78,80,82Sr, 72,74,76,78,80Kr, 80,82Zr; calculated levels, B(λ). Quasiparticle RPA.

doi: 10.1016/0375-9474(94)90348-4
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1993HA11      Phys.Rev. C47, 2008 (1993)

G.B.Hagemann, I.Hamamoto, W.Satula

Electric-Dipole Transitions and Octupole Softness in Odd-A Rare-Earth Nuclei

NUCLEAR STRUCTURE 157Ho, 165,167Tm, 169,171,173Lu, 163Er, 163,165,167Yb, 177Hf; calculated levels, B(λ), Eγ; deduced octupole softness role. One quasiparticle coupled to axially symmetric rotor.

doi: 10.1103/PhysRevC.47.2008
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1993HA22      Nucl.Phys. A557, 515c (1993)

I.Hamamoto

Octupole Softness and Electric-Dipole Transitions in Yrast Spectroscopy

NUCLEAR STRUCTURE 177Hf, 169Lu; compiled, reviewed B(λ) model analyses; deduced E1 transition hindrance factor related features.

doi: 10.1016/0375-9474(93)90566-G
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1993HA23      Phys.Rev. C48, R960 (1993)

I.Hamamoto, H.Sagawa

Gamow-Teller Beta Decay and Isospin Impurity in Nuclei Near the Proton Drip Line

NUCLEAR STRUCTURE 56Ni, 64Ge, 76Sr, 78Zr, 100,106Sn; calculated Gamow-Teller transition strength nonenergy weighted sum rule percentage. 12C, 16O, 40Ca, 56Ni, 64Ge, 76Sr, 80Zr, 100Sn; calculated isospin mixing probabilities. Hartree-Fock plus TDA approximation.

doi: 10.1103/PhysRevC.48.R960
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1993OG01      Nucl.Phys. A559, 100 (1993)

S.Ogaza, J.Kownacki, M.P.Carpenter, J.Gascon, G.B.Hagemann, Y.Iwata, H.J.Jensen, T.Komatsubara, J.Nyberg, G.Sletten, P.O.Tjom, W.Walus, I.Hamamoto

Shapes, Electromagnetic Properties and Enhanced E1 Strength in 169Lu

NUCLEAR REACTIONS 154Sm(19F, 4n), E=85 MeV; measured Eγ, γγ-coin, Iγ, DSA. 169Lu deduced levels, Iγ, rotational band-structure, configuration-dependent shape, pairing, T1/2, transition quadrupole moments, B(M1)/B(E2), B(E1). Comparison to particle-rotor calculations including octupole softness. Enriched target, array of Compton suppressed Ge-detectors.

doi: 10.1016/0375-9474(93)90182-W
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1993SA16      Phys.Lett. 303B, 215 (1993)

H.Sagawa, I.Hamamoto, M.Ishihara

Gamow-Teller States in Light Nuclei Near the Neutron Drip Line

NUCLEAR STRUCTURE 12C; calculated Hartree-Fock single-particle energies. 14,20,22C, 22,24,28O; calculated Gamow-Teller β-decay strength. Hartree-Fock plus RPA(TDA) calculations.

doi: 10.1016/0370-2693(93)91422-J
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1992DR03      Nucl.Phys. A543, 495 (1992)

S.Drissi, A.Bruder, M.Carlen, J.Cl.Dousse, M.Gasser, J.Kern, S.J.Mannanal, B.Perny, Ch.Rheme, J.L.Salicio, J.P.Vorlet, I.Hamamoto

Signature Inversion and Electromagnetic Properties of Aligned Bands in 166Tm

NUCLEAR REACTIONS 165Ho(α, 3n), E=32.6-47.9 MeV; measured Eγ, Iγ, σ(E, Eγ, θ), γγ-coin, γ(t). 166Tm deduced levels, J, K, π, T1/2, B(M1)/B(E2) ratios. Germanium detectors, on-line curved crystal spectrometer.

doi: 10.1016/0375-9474(92)90277-Q
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1992HA23      Phys.Rev. C46, 838 (1992)

G.B.Hagemann, I.Hamamoto

Interaction Strength of Two Crossing Bands

NUCLEAR STRUCTURE 156Dy, 158,160,164Er, 160,162,164,166Yb, 164,166Hf; analyzed level data; deduced crossing band interaction strength. 155,157,159,161Dy, 157,159,161,163,165Er, 161,163,165,167Yb, 167,169,171Hf; analyzed level energy difference data. 157Ho deduced band interaction strength dependence on n-p interaction details.

doi: 10.1103/PhysRevC.46.838
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