Nuclear Theory·nucl-th

Thursday·November 22, 2018

9 papers—7 primary·2 cross-listed

08
[Submitted on 20 Nov 2018] (cross-list from nucl-ex)
How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$ Ar
H. N. Liu🇫🇷 · A. Obertelli🇩🇪 · P. Doornenbal🇯🇵 · C. A. Bertulani🇺🇸 · G. Hagen🇺🇸 · J. D. Holt🇨🇦 · G. R. Jansen🇺🇸 · T. D. Morris🇺🇸 · A. Schwenk🇩🇪 · R. Stroberg🇨🇦 · N. Achouri🇫🇷 · H. Baba🇯🇵 and 68 other authors
The first $γ$ -ray spectroscopy of $^{52}$ Ar, with the neutron number N = 34, was measured using the $^{53}$ K(p,2p) one-proton removal reaction at $\sim$ 210 MeV/u at the RIBF facility. The 2 $_{1}^{+}$ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N $>$ 20. This result is the first experimental signature of the persistence of the N = 34 subshell closure beyond $^{54}$ Ca, i.e., below the magic proton number Z = 20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2 $_{1}^{+}$ systematics of neutron-rich Ar isotopes, and support a N = 34 subshell closure in $^{52}$ Ar.
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1811.08451 [pdf]
PRL(2019)·90 citations
09
[Submitted on 21 Nov 2018] (cross-list from hep-ph)
Towards a holographic quark-hadron continuity
Kazem Bitaghsir Fadafan🇮🇷 · Farideh Kazemian🇮🇷 · Andreas Schmitt🇬🇧
We study dense nuclear and quark matter within a single microscopic approach, namely the holographic Sakai-Sugimoto model. Nuclear matter is described via instantons in the bulk, and we show that instanton interactions are crucial for a continuous connection of chirally broken and chirally symmetric phases. The continuous path from nuclear to quark matter includes metastable and unstable stationary points of the potential, while the actual chiral phase transition remains of first order, as in earlier approximations. We show that the model parameters can be chosen to reproduce low-density properties of nuclear matter and observe a non-monotonic behavior of the speed of sound as a function of the baryon chemical potential, as suggested by constraints from QCD and astrophysics.
Comments:
28+19 pages, 5 figures; v2: clarifications and references added, version to appear in JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1811.08698 [pdf]
JHEP(2019)·44 citations

Affiliations

first authorsco-authorsvia INSPIRE

How Robust is the N = 34 Subshell Closure? First Spectroscopy of 52Ar

Towards a holographic quark-hadron continuity

Affiliations

How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$ Ar