A new proton-unbound isotope 204Ac was produced in the fusion-evaporation reaction <math altimg='si1.svg'><mmultiscripts><mrow><mi mathvariant='normal'>Tm</mi><mo stretchy='false'>(</mo><msup><mrow /><mrow><mn mathvariant='normal'>40</mn></mrow></msup></mrow><mprescripts /><none /><mrow><mn>169</mn></mrow></mmultiscripts><mrow><mi mathvariant='normal'>Ca</mi></mrow><mo>,</mo><msup><mrow><mn mathvariant='normal'>5n</mn><mo stretchy='false'>)</mo></mrow><mrow><mn mathvariant='normal'>204</mn></mrow></msup><mrow><mi mathvariant='normal'>Ac</mi></mrow></math> and identified via the recoil- <italic>&#945;</italic> correlation at the gas-filled recoiled separators SHANS2 and SHANS. The excitation function for producing 204Ac was measured and the optimal beam energy was evaluated to be 212 MeV. Nineteen ER - <math altimg='si2.svg'><msub><mrow><mi>&#945;</mi></mrow><mrow><mn mathvariant='normal'>1</mn></mrow></msub></math> - <math altimg='si3.svg'><msub><mrow><mi>&#945;</mi></mrow><mrow><mn mathvariant='normal'>2</mn></mrow></msub></math> - <math altimg='si4.svg'><msub><mrow><mi>&#945;</mi></mrow><mrow><mn mathvariant='normal'>3</mn></mrow></msub></math> decay chains were observed for this isotope. Based on these chains, the <italic>&#945;</italic>-particle energy and half-life of 204Ac were determined to be 7948(15) keV and 7.4 <math altimg='si5.svg'><msubsup><mrow /><mrow><mo linebreak='badbreak' linebreakstyle='after'>&#8722;</mo><mn>1.4</mn></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo><mn>2.2</mn></mrow></msubsup></math> ms, respectively. Both are consistent with the theoretical prediction. The reduced <italic>&#945;</italic>-decay width was deduced to be 49 <math altimg='si6.svg'><msubsup><mrow /><mrow><mo linebreak='badbreak' linebreakstyle='after'>&#8722;</mo><mn>15</mn></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo><mn>10</mn></mrow></msubsup></math> keV, which indicates a favored <italic>&#945;</italic> decay for 204Ac. In addition, more precise decay properties of <math altimg='si32.svg'><msub><mrow><mi>E</mi></mrow><mrow><mi>&#945;</mi></mrow></msub></math> = 7883(15) keV and <math altimg='si8.svg'><msub><mrow><mi>T</mi></mrow><mrow><mn mathvariant='normal'>1</mn><mo stretchy='false'>/</mo><mn mathvariant='normal'>2</mn></mrow></msub></math> = 7.7 <math altimg='si9.svg'><msubsup><mrow /><mrow><mo linebreak='badbreak' linebreakstyle='after'>&#8722;</mo><mn>1.6</mn></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo><mn>2.7</mn></mrow></msubsup></math> ms were obtained for 205Ac.

China

M.H. Huang

Z.G. Gan

Z.Y. Zhang

L. Ma

J.G. Wang

M.M. Zhang

H.B. Yang

C.L. Yang

X.Y. Huang

Z. Zhao

S.Y. Xu

L.X. Chen

X.J. Wen

Y.F. Niu

C.X. Yuan

Y.L. Tian

Y.S. Wang

J.Y. Wang

M.L. Liu

Y.H. Qiang

W.Q. Yang

H.B. Zhang

Z.W. Lu

S. Guo

W.X. Huang

Y. He

Z.Z. Ren

S.G. Zhou

X.H. Zhou

H.S. Xu

Russia

V.K. Utyonkov

A.A. Voinov

Yu.S. Tsyganov

A.N. Polyakov

<italic>&#945;</italic> decay of the new isotope 204Ac

A new isotope $^{203}$Ac was produced in the reaction $^{40}$Ca + $^{169}$Tm at beam energy of 226 MeV. One correlated α-decay chain was attributed to $^{203}$Ac. The α-particle energy and half-life were determined to be 8217(16) keV and <math><msubsup><mrow><mn>56</mn></mrow><mrow><mo>−</mo><mn>26</mn></mrow><mrow><mo>+</mo><mn>269</mn></mrow></msubsup></math> μs, respectively. The reduced α-decay width (<math><msup><mrow><mi>δ</mi></mrow><mrow><mn>2</mn></mrow></msup></math>) of $^{203}$Ac was deduced to be <math><msubsup><mrow><mn>1096</mn></mrow><mrow><mo>−</mo><mn>906</mn></mrow><mrow><mo>+</mo><mn>921</mn></mrow></msubsup></math> keV, which indicates a favored α decay. The systematics of <math><msup><mrow><mi>δ</mi></mrow><mrow><mn>2</mn></mrow></msup></math> and single-particle energy levels indicate that the new state probably arises from the intruder <math><msub><mrow><mi>s</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math> configuration, which shows an onset of deformation in Ac isotopes. The proton separation energy <math><msub><mrow><mi>S</mi></mrow><mrow><mi>p</mi></mrow></msub></math> of $^{203}$Ac was extracted as <math><mo>−</mo><mn>1214</mn><mo>(</mo><mn>22</mn><mo>)</mo></math> keV and the systematics of <math><msub><mrow><mi>S</mi></mrow><mrow><mi>p</mi></mrow></msub></math> for odd-A isotopes beyond proton drip line were discussed.

Z.C. Li

L.C. Sun

H. Zhou

X. Zhang

X.L. Wu

JINR

-decay Properties of new Neutron-deficient Isotope Ac

We investigate the strongly coupled minimal walking technicolor model (MWT) in the framework of a bottom-up holographic model, where the global SU(4) symmetry breaks into 
					 subgroups. In the holographic model, we found that 125 GeV composite Higgs particles and small Peskin–Takeuchi S parameter can be achieved simultaneously. In addition, the model predicts a large number of particles at the TeV scale, including dark matter candidates Technicolor Interacting Massive Particles (TIMPs). If we consider the dark matter nuclear spin-independent cross-section in the range of 
					, which can be detected by future experiments, the mass range of TIMPs predicted by the holographic technicolor model is 
					 TeV.
				

Yidian Chen

Xiao-Jun Bi

Mei Huang

Holographic technicolor model and dark matter Y.D.C. is Supported by the NSFC (11847232), X.J.B. is Supported by the the National Natural Science Foundation of China (U1738209, 11851303) and M.H. is Supported in part by the NSFC (11725523, 11735007, 11261130311) (CRC 110 by DFG and NSFC), Chinese Academy of Sciences (XDPB09) and the start-up funding from University of Chinese Academy of Sciences (UCAS)

The formation of charged pion condensate in anti-parallel electromagnetic fields and in the presence of the isospin chemical potential is studied in the two-flavor Nambu–Jona-Lasinio model. The method of Schwinger proper time is extended to explore the quantities in the off-diagonal flavor space, i.e. the charged pion. In this framework, 
					 are treated as bound states of quarks and not as point-like charged particles. The isospin chemical potential plays the role of a trigger for charged pion condensation. We obtain the associated effective potential as a function of the strength of the electromagnetic fields and find that it contains a sextic term which possibly induces a weak first order phase transition. The dependence of pion condensation on model parameters is investigated.
				

Jingyi Chao

Andrey Radzhabov

Charged pion condensation in anti-parallel electromagnetic fields and nonzero isospin density J.Y.C. is supported by the NSFC under Grant number: 11605254 and Major State Basic Research Development Program in China (2015CB856903). M.H. is supported by the NSFC under Grant No. 11725523, 11735007 and 11261130311(CRC 110 by DFG and NSFC). A.R. is supported by the CAS President's international fellowship initiative (2017VMA0045) and numerical calculations are performed on computing cluster "Akademik V.M. Matrosov" (http://hpc.icc.ru)

The decay of $^{218}$Pa was investigated by means of α and γ spectroscopy. The nucleus was produced in the fusion reaction $^{40}$Ar+$^{182}$W and separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure). The known α decays of $^{218}$Pa were measured with improved precision and newly assigned to be originating from the ground state, which clarified the ambiguities in their previous assignments. In addition, a new isomeric state in $^{218}$Pa decaying with α-particle energies of 9691(15) keV, 9595(21) keV and a half-life of <math><msubsup><mrow><mn>135</mn></mrow><mrow><mo>−</mo><mn>32</mn></mrow><mrow><mo>+</mo><mn>62</mn></mrow></msubsup></math> μs was identified. The spins and parities of the involved states were tentatively assigned on the basis of the systematic α-decay properties of the odd-proton <math><mi>N</mi><mo>=</mo><mn>127</mn></math> isotones and shell model calculations.

H.B. Zhou

S. Huang

X.T. He

S.Y. Wang

W.Z. Xu

H.W. Li

X.X. Xu

H.R. Yang

L.M. Duan

M.V. Shumeiko

A new isomeric state in Pa

The semi-magic nucleus $^{219}$Np was produced in the fusion reaction $^{187}$Re($^{36}$Ar, 4n)$^{219}$Np at the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure). A fast electronics system based on waveform digitizers was used in the data acquisition and the sampled pulses were processed by digital algorithms. The reaction products were identified using spatial and time correlations between the implants and subsequent α decays. According to the observed α-decay chain, an energy of <math><msub><mrow><mi>E</mi></mrow><mrow><mi>α</mi></mrow></msub><mo>=</mo><mn>9039</mn><mo>(</mo><mn>40</mn><mo>)</mo><mtext> </mtext><mtext>keV</mtext></math> and a half-life of <math><msub><mrow><mi>T</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>=</mo><msup><mrow><msub><mrow><mn>0.15</mn></mrow><mrow><mo>−</mo><mn>0.07</mn></mrow></msub></mrow><mrow><mo>+</mo><mn>0.72</mn></mrow></msup><mtext> </mtext><mtext>ms</mtext></math> were determined for $^{219}$Np. The deduced proton binding energy of $^{219}$Np fits well into the systematics, which gives another evidence of that there is no sub-shell closure at <math><mi>Z</mi><mo>=</mo><mn>92</mn></math>. The influence of the <math><mi>N</mi><mo>=</mo><mn>126</mn></math> shell closure on the stability of Np isotopes is discussed within the framework of α-decay reduced widths.

L. Yu

J. Jiang

Z. Liu

G.Q. Xiao

Alpha decay properties of the semi-magic nucleus Np

We improve the Monte-Carlo based QCD sum rules by introducing the rigorous Hölder-inequality-determined sum rule window and a Breit-Wigner type parametrization for the phenomenological spectral function. In this improved sum rule analysis methodology, the sum rule analysis window can be determined without any assumptions on OPE convergence or the QCD continuum. Therefore, an unbiased prediction can be obtained for the phenomenological parameters (the hadronic mass and width etc.). We test the new approach in the ρ meson channel with re-examination and inclusion of αs corrections to dimension-4 condensates in the OPE. We obtain results highly consistent with experimental values. We also discuss the possible extension of this method to some other channels.

Qi-Nan Wang

Canada

Zhu-Feng Zhang

T.G. Steele

Hong-Ying Jin

Zhuo-Ran Huang

A comprehensive revisit of the ρ meson with improved Monte-Carlo based QCD sum rulesSupported by NSFC (11175153, 11205093, 11347020), Open Foundation of the Most Important Subjects of Zhejiang Province, and K. C. Wong Magna Fund in Ningbo University, TGS is Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Z. F. Zhang and Z. R. Huang are Grateful to the University of Saskatchewan for its Warm Hospitality