Electron capture in core-collapse supernovae investigated through configuration mixing in neutron-rich nuclei

Electron capture in core-collapse supernovae investigated through configuration mixing in neutron-rich nuclei
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通过富中子核中的构型混合研究核心塌陷超新星中的电子捕获

DOI:
10.1088/1742-6596/381/1/012119
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发表时间:
2012
期刊:
Conference Series
影响因子:
--
通讯作者:
Diget C
Diget C
中科院分区:
--
文献类型:
--
作者:
Diget C

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富中子中等质量核的电子捕获是一个关键过程,在这个过程中,阻止大质量恒星核心坍缩的电子被捕获,从而产生非常富中子的核。当核心坍缩时,超新星就开始了。然而,为了进行电子俘获,允许的伽莫夫-泰勒(GT)跃迁必须通过热激发或通过将质子构型从较高的壳层混合到原子核的基态构型中来解除阻塞。本文介绍了在美国密歇根州立大学国家超导回旋加速器实验室进行的丰中子76 Zn同位素组态混合实验。该实验利用单质子和单中子敲除,探测反应残留物的γ射线并测量残留物的平行动量。通过这一点,我们调查的质子成分的76 Zn基态,特别是在π-g 9/2,这可能会解除封锁GT电子捕获,即使在低温下,从而打开了一个新的途径开始崩溃的前超新星恒星的核心。
Electron capture on neutron-rich medium-mass nuclei is a key process where the electrons that impede the collapse of the core of massive stars are captured, thereby producing very neutron-rich nuclei. As the core collapses, the supernova is then initiated. For the electron capture to proceed, however, the allowed Gamow-Teller (GT) transition must be unblocked either by thermal excitations or by mixing of proton configurations from a higher-lying shell into the ground-state configuration of the nucleus. The present paper presents an experiment performed at the National Superconducting Cyclotron Laboratory at Michigan State University, in which we study the configuration mixing in the neutron-rich 76 Zn isotope. The experiment utilised single-proton and single-neutron knockout with detection of reaction-residue γ rays and measurement of the parallel momentum of the residue. Through this we investigate the proton components of the 76 Zn ground state, with a particular interest in π-g 9/2, which may unblock the GT electron capture even at low temperatures and thereby open a new pathway for the initiation of the collapse of the pre-supernova stellar core.
DOI: 10.1103/physrevc.70.034609
发表时间: 2004
期刊: Physical Review C
影响因子: 3.1
作者:
C. Hansen
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期刊: NUCLEAR PHYSICS A
影响因子: 1.4
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期刊: Physical review. C, Nuclear physics
影响因子: --
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影响因子: 1.4
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DOI: 10.1088/1742-6596/381/1/012007
发表时间: 2012
期刊: Journal of Physics: Conference Series
影响因子: --
作者:
J. Tostevin
通讯作者: J. Tostevin