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arXiv 1511.08024nucl-ex
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天体物理学相关的$^{31}$ Cl的质量和等压多重态质量方程的破裂

Mass of astrophysically relevant $^{31}$Cl and the breakdown of the isobaric multiplet mass equation

A. Kankainen, L. Canete, T. Eronen, J. Hakala, A. Jokinen, J. Koponen, I. D. Moore, D. Nesterenko, J. Reinikainen, S. Rinta-Antila, A. Voss, J. Äystö

摘要:

$^{31}$ Cl的质量已在离子引导同位素分离器在线(IGISOL)设施上用JYFLTRAP双潘宁阱质谱仪测量。测定的质量过剩值为-7034.7(34)keV,比2012年原子质量评估中的精确度高15倍。当采用新的质量值时,T=3/2四重态在A=31处的等压多重态质量方程的二次形式失效($χ^2_n$ =11.6),并且得到非零的三次项d=-3.5(11)keV。已发现$^{31}$ Cl与质子结合较少,质子分离能为$S_p$ =265(4)keV。使用新的$S_p$值,可以显着提高精度地确定$^{31}$ Cl中激发态的能量和$^{31}$ Cl的光衰变速率。改进的光致蜕变速率有助于限制天体物理条件,在这种条件下,$^{30}$ S可以在I型X射线爆发中的快速质子捕获过程中充当等待点。

英文摘要:

The mass of $^{31}$Cl has been measured with the JYFLTRAP double Penning trap mass spectrometer at the Ion-Guide Isotope Separator On-Line (IGISOL) facility. The determined mass-excess value, -7034.7(34) keV, is 15 times more precise than in the Atomic Mass Evaluation 2012. The quadratic form of the isobaric multiplet mass equation for the T=3/2 quartet at A=31 fails ($χ^2_n$=11.6) and a non-zero cubic term, d=-3.5(11) keV, is obtained when the new mass value is adopted. $^{31}$Cl has been found to be less proton-bound with a proton separation energy of $S_p$=265(4) keV. Energies for the excited states in $^{31}$Cl and the photodisintegration rate on $^{31}$Cl have been determined with significantly improved precision using the new $S_p$ value. The improved photodisintegration rate helps to constrain astrophysical conditions where $^{30}$S can act as a waiting point in the rapid proton capture process in type I x-ray bursts.

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