Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Katsuma, M."'
Autor:
Katsuma, M.
The triple-$\alpha$ reaction from ternary continuum states at off-resonant energies, $\alpha+\alpha+\alpha \rightarrow ^{12}$C, still remains in unsolved problems. This direct process is estimated with a non-adiabatic Faddeev hyper-spherical harmonic
Externí odkaz:
http://arxiv.org/abs/2411.03600
Autor:
Katsuma, M.
Triple-$\alpha$ reaction rates have been determined well with the sequential process via the narrow resonances. However, the direct triple-$\alpha$ process at off-resonant energies still remains in unsolved problems. In the present report, the direct
Externí odkaz:
http://arxiv.org/abs/2302.03844
Autor:
Katsuma, M.
The conversion between the formal and observed parameters is obtained from the phase equivalence between the $R$-matrix and Breit-Wigner formula, and it is applied to a study of the low-energy $E$1 $S$-factor of $^{12}$C($\alpha$,$\gamma_0$)$^{16}$O.
Externí odkaz:
http://arxiv.org/abs/1910.00158
Autor:
Katsuma, M.
The subthreshold 1$^-_1$ state at an excitation energy $E_x = 7.12$ MeV in $^{16}$O has been believed to enhance the $S$-factor of $^{12}$C($\alpha$,$\gamma$)$^{16}$O. The enhancement seems to originate from strong interference between 1$^-_1$ and 1$
Externí odkaz:
http://arxiv.org/abs/1811.10836
Autor:
Katsuma, M.
The astrophysical $S$-factor of $E$1 transition for $^{12}$C($\alpha$,$\gamma_0$)$^{16}$O is discussed in the $R$-matrix theory. The reduced $\alpha$-particle widths of the 1$^-_1$ ($E_x= 7.12$ MeV) and 1$^-_2$ ($E_x= 9.59$ MeV) states are extracted
Externí odkaz:
http://arxiv.org/abs/1701.02848
Autor:
Katsuma, M.
The photodisintegration of $^{16}$O is predicted to be dominated by $E$2 excitation in the vicinity of the $\alpha$-particle threshold. The reaction rates of $^{12}$C($\alpha$,$\gamma$)$^{16}$O are expected to be determined from this reaction.
C
C
Externí odkaz:
http://arxiv.org/abs/1611.02057
Autor:
Katsuma, M.
The radiative capture cross sections of $^{12}$C($\alpha$,$\gamma$)$^{16}$O and derived reaction rates are calculated from the direct capture potential model. The resulting $S$-factor at low energies is found to be dominated by $E$2 transition to the
Externí odkaz:
http://arxiv.org/abs/1501.06250
Autor:
Katsuma, M.
The photoelectric cross section of $^{16}$O($\gamma$,$\alpha$)$^{12}$C is estimated to be larger than the radiative capture cross section of $^{12}$C($\alpha$ ,$\gamma$)$^{16}$O. The predicted cross section and the angular distribution of $\alpha$-pa
Externí odkaz:
http://arxiv.org/abs/1409.1655
Autor:
Katsuma, M.
The additional resonant contribution to the potential model is examined in $\alpha$+$^{12}$C elastic scattering and the low-energy $^{12}$C($\alpha$,$\gamma$)$^{16}$O reaction. The excitation function of elastic scattering below $E_{c.m.}= 5$ MeV see
Externí odkaz:
http://arxiv.org/abs/1404.3966
Autor:
Arnould, M., Katsuma, M.
A necessary condition for the reliable modelling of the structure or evolution of the stars and of their concomitant nucleosynthesis is the availability of good quality nuclear data in a very wide area of the chart of nuclides. This short review pres
Externí odkaz:
http://arxiv.org/abs/0706.1132