TY - JOUR

T1 - Radiative capture reaction rate from Λ Λ to H dibaryon in the imaginary time method

AU - Hikota, Eri

AU - Funaki, Yasuro

AU - Hiyama, Emiko

AU - Oka, Makoto

N1 - Publisher Copyright:
© 2015 American Physical Society.

PY - 2015/7/13

Y1 - 2015/7/13

N2 - Radiative capture rates of thermal ΛΛ+ΞN states into a H dibaryon are calculated in the novel imaginary time method. The H dibaryon is assumed to be a bound state of ΞN with spin Jπ=0+, isospin I=0 and strangeness -2. We consider the E1 transition to H from ΞN (L=1) scattering states which mix with ΛΛ(L=1). In order to calculate the transition rates, we formulate a coupled-channel imaginary time method by extending the one-channel formula originally proposed by Yabana and Funaki. The imaginary time method allows us to avoid the sum over all the excited thermal initial states, and thus to save computational time significantly. The transition rates are given as a function of temperature and the unknown binding energy of the H dibaryon, which we take as a parameter. It is found that the transition rate is not sensitive to the choices of the H binding energy or the strengths of the channel coupling for temperatures 3 MeV or higher.

AB - Radiative capture rates of thermal ΛΛ+ΞN states into a H dibaryon are calculated in the novel imaginary time method. The H dibaryon is assumed to be a bound state of ΞN with spin Jπ=0+, isospin I=0 and strangeness -2. We consider the E1 transition to H from ΞN (L=1) scattering states which mix with ΛΛ(L=1). In order to calculate the transition rates, we formulate a coupled-channel imaginary time method by extending the one-channel formula originally proposed by Yabana and Funaki. The imaginary time method allows us to avoid the sum over all the excited thermal initial states, and thus to save computational time significantly. The transition rates are given as a function of temperature and the unknown binding energy of the H dibaryon, which we take as a parameter. It is found that the transition rate is not sensitive to the choices of the H binding energy or the strengths of the channel coupling for temperatures 3 MeV or higher.

UR - http://www.scopus.com/inward/record.url?scp=84937010854&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84937010854&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.92.015205

DO - 10.1103/PhysRevC.92.015205

M3 - Article

AN - SCOPUS:84937010854

SN - 0556-2813

VL - 92

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 1

M1 - 015205

ER -