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898 results on '"Aoyama S"'

178. Tensor Force Manifestations in ab Initio Study of the H( d, γ)He, H( d, p)H, and H( d, n)He Reactions.

Author

Arai, K., Aoyama, S., Suzuki, Y., Descouvemont, P., and Baye, D.

Subjects
HELIUM isotopes, HYDROGEN isotopes, NUCLEAR reactions, NUCLEAR cluster model, NUCLEON-nucleon interactions, ASTROPHYSICS, GRAVITY assist (Astrodynamics)
Abstract

The H( d, γ)He capture reaction and the H( d, p)H and H( d, n)He transfer reactions at very low energies are studied in an extended microscopic cluster model with a realistic nucleon-nucleon force. Our results show that the tensor force in realistic interactions plays an essential and indispensable role to reproduce the very low-energy astrophysical S factor of these reactions. [ABSTRACT FROM AUTHOR]

Published
2013
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189. Tensor Force Manifestations in Ab Initio Study of the ²H(d, γ)4He, ²H(d, p)³H, and ²H(d, n)³He Reactions.

Author

Arai, K., Aoyama, S., Suzuki, Y., Descouvemont, P., and Baye, D.

Subjects
*COULOMB functions, *WAVE functions, *PHENOMENOLOGICAL theory (Physics), *SCATTERING (Physics), *ASTROPHYSICS, *STOCHASTIC processes
Abstract

The ²H(d, p)³H, ²H(d, n)3He, and ²H(d, ϒ)4He reactions are studied at low energies in a multichannel ab initio model that takes into account the distortions of the nuclei. The internal wave functions of these nuclei are given by the stochastic variational method with the AV81 realistic interaction and a phenome- nological three-body force included to reproduce the two-body thresholds. The obtained astrophysical S factors are all in very good agreement with the experiment. The most important channels for both transfer and radiative capture are identified by comparing to calculations with an effective central force. They are all found to dominate thanks to the tensor force. [ABSTRACT FROM AUTHOR]

Published
2011
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192. A MICROSCOPIC CLUSTER MODEL STUDY OF 3He + p SCATTERINGS.

Author

ARAI, K., AOYAMA, S., and SUZUKI, Y.

Subjects
*PARTICLES (Nuclear physics), *SCATTERING (Physics), *NUCLEAR reactions, *SHEAR waves, *LAMB waves
Abstract

3He + p scattering phase shifts for the S- and P-waves are studied in a microscopic cluster model in order to investigate the role of the d + 2p channel in the low-energy phase shifts. In the present cluster model, the description of the 3He wave function is extended from a simple (0s)3 model to a three-body model and two different nucleon-nucleon interactions, the Minnesota and AV8' potentials, are employed. The present extended cluster model shows that the d + 2p channel is indispensable to reproduce the resonant phase shifts in the AV8' potential while it plays a minor role in the MN potential. On the contrary, the role of this channel in the S-wave non-resonant phase shifts is negligible in both potentials. [ABSTRACT FROM AUTHOR]

Published
2010
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193. DI-NEUTRON CORRELATIONS IN THE SUPER NEUTRON-RICH NUCLEUS; 7H.

Author

AOYAMA, S. and ITAGAKI, N.

Subjects
*PARTICLES (Nuclear physics), *PAIRING correlations (Nuclear physics), *PROTONS, *NEUTRONS, *NUCLEAR physics
Abstract

We study the di-neutron correlations in the super neutron-rich nucleus 7H with the AMD triple-S (AMD superposition of selected snapshots). 7H is the most neutron-rich nucleus in the neutron ratio to the proton (N/Z = 6). And the strong di-neutron correlations are expected due to the weak binding properties. In this paper, the mixing of di-neutron cluster components is estimated by calculating the squared overlap with the di-neutron condensate type wave function. The calculated results show significant mixing of di-neutron (t + 2n + 2n) components (70 ~ 80%). [ABSTRACT FROM AUTHOR]

Published
2010
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