Complete set of polarization transfer observables for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>16</mml:mn></mml:msup></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>⃗</mml:mo></mml:mover><mml:mo>,</mml:mo><mml:mspace width="-0.16em" /><mml:mover accent="true"><mml:mi>n</mml:mi><mml:mo>⃗</mml:mo></mml:mover><mml:mo>)<

Wakasa, T.; Okamoto, Masao; Takaki, M.; Dozono, M.; Hatanaka, K.; Ichimura, M.; Noro, T.; Okamura, H.; Sakemi, Y.

doi:10.1103/physrevc.84.014614

Cited by 14 publications

(11 citation statements)

References 45 publications

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“…5(a)) and certainly it corresponds to the J π T = 2 − 1 resonance of 4 H. We see some difference in the shape of the strength function. Two conceivable reasons for it include firstly that the spin-nonflip process can in fact contribute to the SD transition as the ground state of 4 He contains S = 2 components and secondly that some higher multipole effects may contribute to the cross section particularly at high energy [10]. The first reason is easily understood if we consider the transition from (L = S = 2) to (L = 1, 2, 3, S = 2).…”

Section: A Discretized Spin-dipole Strengthmentioning

confidence: 99%

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Spin-dipole strength functions of4He with realistic nuclear forces

Horiuchi

Suzuki

2013

Phys. Rev. C

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Both isoscalar and isovector spin-dipole excitations of 4 He are studied using realistic nuclear forces in the complex scaling method. The ground state of 4 He and discretized continuum states with J π = 0 − , 1 − , 2 − for A = 4 nuclei are described in explicitly correlated Gaussians reinforced with global vectors for angular motion. Two-and three-body decay channels are specifically treated to take into account final state interactions. The observed resonance energies and widths of the negative-parity levels are all in fair agreement with those calculated from both the spin-dipole and electric-dipole strength functions as well as the energy eigenvalues of the complex scaled Hamiltonian. Spin-dipole sum rules, both non energy-weighted and energy-weighted, are discussed in relation to tensor correlations in the ground state of 4 He.

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Section: A Discretized Spin-dipole Strengthmentioning

confidence: 99%

“…Recently the charge-exchange reaction of ( 7 Li, 7 Beγ) is undertaken to measure the electric dipole (E1) and the SD resonances of 4 He and 6,7 Li [8,9]. A more recent measurement of polarization transfer observables with 16 O( p, n) 16 F reaction [10] indicates that valuable information on the SD excitations is attainable.…”

Section: Introductionmentioning

confidence: 99%

Spin-dipole strength functions of4He with realistic nuclear forces

Horiuchi

Suzuki

2013

Phys. Rev. C

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“…In practice, this is less likely to occur, the two resonances overlap and 1 − states displaying not vanishing transition strength associated to either of the operators can be found to be degenerate or lying close in energy (see examples in Ref. [36]). …”

Section: A Time-dependent Hartree-fock Modelmentioning

confidence: 99%

Unrestricted Skyrme-tensor time-dependent Hartree-Fock model and its application to the nuclear response from spherical to triaxial nuclei

2012

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The nuclear time-dependent Hartree-Fock model formulated in the three-dimensional space, based on the full standard Skyrme energy density functional complemented with the tensor force, is presented for the first time. Full self-consistency is achieved by the model. The application to the isovector giant dipole resonance is discussed in the linear limit, ranging from spherical nuclei ( 16 O, 120 Sn) to systems displaying axial or triaxial deformation ( 24 Mg, 28 Si, 178 Os, 190 W , 238 U). Particular attention is paid to the spin-dependent terms from the central sector of the functional, recently included together with the tensor. They turn out to be capable of producing a qualitative change on the strength distribution in this channel. The effect on the deformation properties is also discussed. The quantitative effects on the linear response are small and, overall, the giant dipole energy remains unaffected. Calculations are compared to predictions from the (quasi)-particle random phase approximation and experimental data where available, finding good agreement.

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“…For instance, 16 O is the key nucleus in the waterČherenkov detector for (anti-)neutrinos providing evident signals of supernova neutrino bursts and neutrino oscillations [14][15][16]. In one of the most recent experiments, the fine structure of GT and SD excitations in 16 O has been identified by using the 16 O( p, n) 16 F reaction with polarized proton beam [17]. In this experiment, the known SD states [18] of E x 8 MeV have been clearly identified, where the excitation energies E x are measured from the ground state of the daughter nucleus 16 F. As shown with arrows in Fig.…”

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confidence: 99%

Fine structure of charge-exchange spin-dipole excitations in16O

2012

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The charge-exchange spin-dipole (SD) excitations for both (p, n) and (n, p) channels in 16 O are investigated in the fully self-consistent random phase approximation based on the covariant density functional theory. The fine structure of SD excitations in the most up-to-date 16 O( p, n) 16 F experiment is excellently reproduced without any readjustment in the functional. The SD excitations are characterized by the delicate balance between the σ-and ω-meson fields via the exchange terms. The fine structure of SD excitations for the 16 O(n, p) 16 N channel is predicted for future experiments. PACS numbers: 24.30.Cz, 21.60.Jz, 24.10.Jv, 25.40.Kv The nuclear charge-exchange excitations [1] correspond to the transitions from the ground state of the nucleus (N, Z) to the final states in the neighboring nuclei (N ∓ 1, Z ± 1) in the isospin lowering T − and raising T + channels, respectively. These excitations can take place spontaneously such as the well-known β decays or be induced by external fields such as the charge-exchange (p, n) or (n, p) reactions. They are categorized according to the orbital angular momentum transfer as allowed transitions with L = 0 and first-and second-forbidden transitions with L = 1 and L = 2, etc. Meanwhile, they are also classified by the spin's degree of freedom as the non-spin-flip modes with S = 0 and the spin-flip modes with S = 1.Among all the nuclear charge-exchange excitation modes, the spin-dipole (SD) excitations with S = 1 and L = 1 have attracted more and more attentions due to their connection with the neutron-skin thickness [2], the cross sections of neutrino-nucleus scattering [3,4], the double beta decay rates [5], and so on. Different from the famous Gamow-Teller (GT) excitations having a single spin-parity J π = 1 + component, the SD excitations are composed of three collective components with spin-parity J π = 0 − , 1 − , and 2 − . It is relatively straight forward to distinguish the orbital angular momentum transfer L by the angular distributions of double differential cross sections, but it is not trivial to resolve different J π components in SD excitations [1]. However, the resolution of these three J π components is crucial to understand the multipole-dependent effects on the neutrino-nucleus scattering [6] and neutrinoless double beta (0νββ) decays [7,8], and the strengths of nucleon-nucleon effective tensor interactions [9, 10] for understanding the evolution of the single-particle energies in exotic nuclei [11,12]. In particular, the J π = 0 − states can also serve as doorways for parity mixing in compound nuclear states [13]. Therefore, the investigation of the fine structure for SD excitations including all J π components has become one of the central issues for both experimental and theoretical nuclear physics, particle physics, and astrophysics.Charge-exchange excitations in 16 O are of particular interest in both nuclear physics and astrophysics. For instance, 16 O is the key nucleus in the waterČherenkov detector for (anti-)neutrinos providing evident s...

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Complete set of polarization transfer observables for the16O(p⃗,n⃗)<

Cited by 14 publications

References 45 publications

Spin-dipole strength functions of4He with realistic nuclear forces

Spin-dipole strength functions of4He with realistic nuclear forces

Unrestricted Skyrme-tensor time-dependent Hartree-Fock model and its application to the nuclear response from spherical to triaxial nuclei

Fine structure of charge-exchange spin-dipole excitations in16O

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