Chin. Phys., 2007, Vol. 16(12): 3624-3630    DOI: 10.1088/1009-1963/16/12/012
 THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Prev   Next

# Neutrino energy loss by electron capture on strongly screened iron group nuclei

Liu Jing-Jing, Luo Zhi-Quan
Institute of Theoretical Physics, China West Normal University, Nanchong 637002, China
Abstract  The influences on the neutrino energy loss rates in iron group nuclei at the same density are investigated in the presence of strong electron screening and in the absence of electron screening. The results show that at a temperature of $15\ti10^9$\,K, the neutrino energy loss rates which come from the electron capture process for most iron group nuclei decrease no more than 2 orders of magnitude but for the others (such as $^{53,55,56,57,58,59,60}$Co, $^{56,59}$Ni) they can decrease about 3 orders of magnitude due to strong electron screening (SES), whereas, at a temperature of $10^9K$ the neutrino energy loss rates of the most iron group nuclei can be diminished greatly due to the SES. For example, $^{61}$Fe, $^{60}$Fe, and $^{62}$Ni the neutrino energy loss rates decrease about 4, 15 and 16 orders of magnitude and for $^{57}$Cr, $^{58}$Cr, and $^{60}$Cr decrease about 18, 12, and 10 orders of magnitude respectively. According to our calculations the neutrino energy loss rates of nuclei $^{58}$Mn, $^{59}$Mn, $^{60}$Mn, and $^{62}$Mn may decrease about 13 orders of magnitude at a temperature of $10^9$\,K due to the SES.
Keywords:  neutrino energy loss      strong electron screening      electron capture
Published:  20 December 2007
 PACS: 23.40.-s (β-decay;double β-decay; electron and muon capture) 27.40.+z (39 ≤ A ≤ 58) 97.10.Cv (Stellar structure, interiors, evolution, nucleosynthesis, ages)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10347008).