Gaussian modification of neutrino energy loss on strongly screening nuclides 55Co and 56Ni by electron capture in stellar interior

  • Gaussian modifications of the neutrino energy loss (NEL) by electron capture on the strongly screening nuclides 55Co and 56Ni are investigated. The results show that in strong electron screening (SES), the NEL rates decrease without modifying the Gamow-Teller (G-T) resonance transition. For instance, the NEL rates of 55Co and 56Ni decrease more than two and three orders of magnitude for ρ7=5.86, T9≤5, Ye=0.47, Δ=6.3, respectively. In contrast, due to Gaussian modification, the NEL rates increase about two orders of magnitude in SES. Due to SES, the maximum values of the C-factor (in %) on NEL of 55Co, 56Ni are of the order of 99.80%, 99.56% at ρ7=5.86 Ye=0.47 and 99.60%, 99.65% at ρ7=106 Ye=0.43, respectively.
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  • [1] Fuller G M, Fowler W A, Newman M J. Astrophys J. 1980, 42: 447; Astrophys J. 1985, 293: 12 Itoh N, Nishikawa A, Kohyama Y. Astrophys J, 1996, 470: 10153 Gutierrez J, Garcia-Berro E, Iben I, Isern J, Labay J, Canal R. Astrophys J. 1996, 459: 7014 Bravo E, Garcia-Senz D. Monthly Notices of the Royal As-tronomical Society, 1999, 307: 9845 LUO Z Q, LIU M Q, LIN L B, PENG Q H. Chinese As-tronomy and Astrophysics, 2006, 30(1): 196 LUO Z Q, PENG Q H. Chinese Astronomy and Astro-physics, 2001, 25(1): 17 LIU J J, LUO Z Q. Chinese Physics Lett., 2007, 24(7): 18618 LIU J J. Chinese Physics C (HEP NP), 2010, 34(2): 1719 LIU J J. Chinese Physics C (HEP NP), 2010, 34(11): 19010 LIU J J. Chinese Physics B, 2010, 19(9): 09960111 Itoh N, Tomizawa N, Tamamura M, Yasuharu K, Satoshi N. Astrophys J, 2002, 579: 38012 Heger A,Woosley S E,Martinez-Pinedo G, Langanke K. As-trophys J, 2001, 560: 30713 Nabi J-Un,Rahman M-Ur, Sajjad M. Acta.Phys.Polon.B, 2008, 39: 651; Brazilian Journal of Physics, 2007, 37: 123814 Aufderheide M B,Fushiki I,Woosley S E,Stanford E, Hart-mann D H. Astrophys.J, 1994, 91: 38915 Pruet J J, Fuller G M. Astrophys J, 2003, 149: 18916 Kar K, Ray A, Sarkar S. Astrophys J, 1994, 434: 66217 LUO Z Q, LIU MQ, LIN L B, PENG Q H. Chinese Physics, 2005, 14(6): 127218 LIU J J, LUO Z Q. Acta Astronomica Sinica, 2010, 51(2): 144 (in Chinese)
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LIU Jing-Jing, KANG Xiao-Ping, HE Zhong, Huai-Ren, SHI Huan-Yu, HUANG Hong-Chao, ZHONG Shan, FENG Hao and LI Chang-Wei. Gaussian modification of neutrino energy loss on strongly screening nuclides 55Co and 56Ni by electron capture in stellar interior[J]. Chinese Physics C, 2011, 35(3): 243-247. doi: 10.1088/1674-1137/35/3/006
LIU Jing-Jing, KANG Xiao-Ping, HE Zhong, Huai-Ren, SHI Huan-Yu, HUANG Hong-Chao, ZHONG Shan, FENG Hao and LI Chang-Wei. Gaussian modification of neutrino energy loss on strongly screening nuclides 55Co and 56Ni by electron capture in stellar interior[J]. Chinese Physics C, 2011, 35(3): 243-247.  doi: 10.1088/1674-1137/35/3/006 shu
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Received: 2010-05-25
Revised: 2010-06-12
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Gaussian modification of neutrino energy loss on strongly screening nuclides 55Co and 56Ni by electron capture in stellar interior

Abstract: Gaussian modifications of the neutrino energy loss (NEL) by electron capture on the strongly screening nuclides 55Co and 56Ni are investigated. The results show that in strong electron screening (SES), the NEL rates decrease without modifying the Gamow-Teller (G-T) resonance transition. For instance, the NEL rates of 55Co and 56Ni decrease more than two and three orders of magnitude for ρ7=5.86, T9≤5, Ye=0.47, Δ=6.3, respectively. In contrast, due to Gaussian modification, the NEL rates increase about two orders of magnitude in SES. Due to SES, the maximum values of the C-factor (in %) on NEL of 55Co, 56Ni are of the order of 99.80%, 99.56% at ρ7=5.86 Ye=0.47 and 99.60%, 99.65% at ρ7=106 Ye=0.43, respectively.

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