Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians
Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians
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DOI：
10.1016/j.physletb.2020.135678
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发表时间：
2019-12
影响因子：
4.4
通讯作者：
S. Heil;M. Petri;M. Petri;K. Vobig;D. Bazin;J. Belarge;P. Bender;P. Bender;B. Brown;Robert Elder;B. Elman;A. Gade;T. Haylett;J. Holt;T. Hüther;A. Hufnagel;H. Iwasaki;N. Kobayashi;C. Loelius;B. Longfellow;E. Lunderberg;M. Mathy;J. Menendez;S. Paschalis;R. Roth;A. Schwenk;A. Schwenk;J. Simonis;I. Syndikus;D. Weisshaar;K. Whitmore
中科院分区：
文献类型：
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作者：
S. Heil;M. Petri;M. Petri;K. Vobig;D. Bazin;J. Belarge;P. Bender;P. Bender;B. Brown;Robert Elder;B. Elman;A. Gade;T. Haylett;J. Holt;T. Hüther;A. Hufnagel;H. Iwasaki;N. Kobayashi;C. Loelius;B. Longfellow;E. Lunderberg;M. Mathy;J. Menendez;S. Paschalis;R. Roth;A. Schwenk;A. Schwenk;J. Simonis;I. Syndikus;D. Weisshaar;K. Whitmore
奇异核的结构为最先进的核理论提供了有价值的检验。特别是电磁跃迁率对核力和多体物理学的各个方面比单独的激发能更敏感。我们报告了21 O激发态的首次寿命测量，发现τ 12 += 420− 32+ 35（stat）− 12+ 34（sys）ps。这一结果与几种γ射线衰变的能级方案和分支比一起，与唯象壳模型和基于手征有效场论导出的两核子力和三核子力的从头计算结果进行了比较。我们发现电四极子降低了B（E2; 1/2+→ 5/2 g. s.+）= 0.71− 0.06− 0.06+ 0.07+ 0.02 e 2 fm 4，由1/2+态的寿命导出，比使用标准有效电荷的唯象结果小，这表明在富中子氧同位素中需要修改后者。我们将这一结果与大空间和价空间从头计算进行比较，并通过使用多输入相互作用，我们探索了这种可观察到的核力的基本细节的敏感性。
The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states in 21 O, finding τ 1/2+= 420− 32+ 35 (stat)− 12+ 34 (sys) ps. This result together with the deduced level scheme and branching ratio of several γ-ray decays are compared to both phenomenological shell-model and ab initio calculations based on two-and three-nucleon forces derived from chiral effective field theory. We find that the electric quadrupole reduced transition probability of B (E 2; 1/2+→ 5/2 g. s.+)= 0.71− 0.06− 0.06+ 0.07+ 0.02 e 2 fm 4, derived from the lifetime of the 1/2+ state, is smaller than the phenomenological result where standard effective charges are employed, suggesting the need for modifications of the latter in neutron-rich oxygen isotopes. We compare this result to both large-space and valence-space ab initio calculations, and by using multiple input interactions we explore the sensitivity of this observable to underlying details of nuclear forces.