Date: Wed, 29 Apr 20 00:28:34 GMT Subject: nucl-th daily 3 new + 5 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Mon 27 Apr 20 18:00:00 GMT to Tue 28 Apr 20 18:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:2004.13525 Date: Sun, 26 Apr 2020 01:19:31 GMT (640kb) Title: 12B(n,gamma)13B reaction as alternative path to astrophysical synthesis of 13C isotope Authors: S.B. Dubovichenko, N.A. Burkova, A.V. Dzhazairov-Kakhramanov, A.Yertaiuly Categories: nucl-th Comments: 18p., 5 fig., 4 tabl., 48 ref Report-no: aphi-2020-2 \\ The total cross sections of the neutron radiative capture on 12B at astrophysical energies to the ground state of 13B have been calculated in the energy range of 10E-8 to 10 MeV within the framework of a modified potential cluster model with the classification of orbital states according to Young diagrams. Reaction rates in the temperature range of 0.01 to 10 T9 and their analytical parameterization were obtained. The calculated rates of 12B(n,gamma)13B excess the previous results by approximately to one order. Cross sections and reaction rates of 12C(n,gamma)13C are calculated and compared to the n10B, n11B, n12B, and p12C reaction rates. It is proposed that obtained rates of the 12B(n,gamma)13B reaction should be taken into account in novel scenarios of stable isotope 13C synthesis without of 12C hydrogen burning. \\ ( https://arxiv.org/abs/2004.13525 , 640kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13575 Date: Tue, 28 Apr 2020 15:03:40 GMT (1997kb,AD) Title: Ab initio calculations of low-energy nuclear scattering using a generalized L\"uscher method Authors: Xilin Zhang, S. R. Stroberg, P.Navr\'atil, Chan Gwak, J. A. Melendez, R. J. Furnstahl and J. D. Holt Categories: nucl-th hep-lat Comments: 13 pages, 10 figures, and 6 tables, with ancillary files included Report-no: INT-PUB-20-018 \\ The L\"uscher method in Lattice QCD was recently generalized to enable low-energy nuclear scattering results to be extracted from the discrete energy levels of the target-projectile clusters confined by harmonic potential traps. Here we report encouraging results for neutron--$\alpha$ and neutron--$^{24}\mathrm{O}$ elastic scattering from analyzing the trapped levels computed using two different ab initio nuclear structure methods. The $n$--$\alpha$ results have also been checked against a direct ab initio reaction calculation. The $n$--$^{24}\mathrm{O}$ results demonstrate the approach's applicability for a large range of systems provided their spectra in traps can be computed by ab initio methods. A key ingredient is a rigorous understanding of the errors in the calculated energy levels caused by inevitable Hilbert-space truncations in the ab initio methods. \\ ( https://arxiv.org/abs/2004.13575 , 1997kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13588 Date: Tue, 28 Apr 2020 15:24:12 GMT (264kb,D) Title: The Lagrange-mesh R-matrix method for inhomogenous equations Authors: Jin Lei and Pierre Descouvemont Categories: nucl-th Comments: 7 pages, 6 figures \\ The Lagrange-mesh $R$-matrix method is generalized to inhomogeneous equations. This method is numerically stable and efficient. It can be directly used for transfer reactions with the formalism discussed by Ascuitto and Glendenning [Phys. Rev. 181,1396 (1969)] and for inclusive breakup reactions modeled by Ichimura, Austern, and Vincent [Phys. Rev. C 32, 431 (1985)]. We first present a simple example to assess the method. Then the application to the $^{93}$Nb($d$,$pX$) non-elastic breakup is discussed. \\ ( https://arxiv.org/abs/2004.13588 , 264kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:2004.13193 (*cross-listing*) Date: Mon, 27 Apr 2020 21:44:38 GMT (401kb) Title: Intrinsic Transverse Momentum and Evolution in Weighted Spin Asymmetries Authors: Jian-Wei Qiu, Ted C. Rogers and Bowen Wang Categories: hep-ph nucl-th Comments: 12 pages, 3 figures \\ The transverse momentum dependent (TMD) and collinear higher twist theoretical factorization frameworks are the most frequently used approaches to describing spin dependent hard cross sections weighted by and integrated over transverse momentum. Of particular interest is the contribution from small transverse momentum associated with the target bound state. In phenomenological applications, this contribution is often investigated using transverse momentum weighted integrals that sharply regulate the large transverse momentum contribution, for example with Gaussian parametrizations. Since the result is a kind of hybrid of TMD and collinear (inclusive) treatments, it is important to establish if and how the formalisms are related in applications to weighted integral observables. The suppression of a large transverse momentum tail, for example, can potentially affect the type of evolution that is applicable. We find that a naive version of a widely used identity relating the $k_T^2$-weighted and integrated Sivers TMD function to a renormalized twist-3 function has strongly ambiguous ultraviolet contributions, and that corrections to it are not necessarily perturbatively suppressed. We discuss the implications for applications, arguing in particular that the relevant evolution for transverse momentum weighted and integrated cross sections with sharp effective large transverse momentum cutoffs is of the TMD form rather than the standard renormalization group evolution of collinear correlation functions. \\ ( https://arxiv.org/abs/2004.13193 , 401kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13467 (*cross-listing*) Date: Tue, 28 Apr 2020 13:03:22 GMT (427kb,D) Title: Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states Authors: Magdalena Skurzok Categories: nucl-ex nucl-th \\ In this paper the search for eta-mesic nuclei with particular focus on light $\eta$-He bound states is reviewed. A brief description of recent theoretical studies and experimental results is presented. \\ ( https://arxiv.org/abs/2004.13467 , 427kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13568 (*cross-listing*) Date: Tue, 28 Apr 2020 14:45:38 GMT (410kb) Title: The newly observed $\Lambda_b(6072)^0$ structure and its $\rho-$mode nonstrange partners Authors: Wei Liang and Qi-Fang L\"u Categories: hep-ph hep-ex nucl-th Comments: 8 pages, 4 figures, comments and suggestions are welcome \\ Inspired by the newly observed $\Lambda_b(6072)$ structure, we investigate its strong decay behaviors under various assignments within the $^3P_0$ model. Compared with the mass and total decay width, our results suggest that the $\Lambda_b(6072)$ can be regarded as the lowest $\rho-$mode excitation in $\Lambda_b$ family. Then, the strong decays of $\rho-$mode nonstrange partners for the $\Lambda_b(6072)$ are calculated. It is found that the $J^P=5/2^-$ $\Lambda_b$ and $\Lambda_c$ states are relatively narrow, and mainly decay into the $\Sigma_b^{(*)} \pi$ and $\Sigma_c^{(*)} \pi$ final states, respectively. These two states have good potentials to be observed in future experiments, which may help us to distinguish the three-quark model and diquark model. \\ ( https://arxiv.org/abs/2004.13568 , 410kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13627 (*cross-listing*) Date: Tue, 28 Apr 2020 16:19:36 GMT (29kb) Title: Enhanced dynamics in fusion of neutron-rich oxygen nuclei at above-barrier energies Authors: S. Hudan, R.T. deSouza, A.S. Umar, Z. Lin, C.J. Horowitz Categories: nucl-ex nucl-th Comments: 6 pages, 4 figures \\ Above-barrier fusion cross-sections for an isotopic chain of oxygen isotopes with A=16-19 incident on a $^{12}$C target are presented. Experimental data are compared with both static and dynamical microscopic calculations. These calculations are unable to explain the $\sim$37\% increase in the average above-barrier fusion cross-section observed for $^{19}$O as compared to $\beta$-stable oxygen isotopes. This result suggests that for neutron-rich nuclei existing time-dependent Hartree-Fock calculations underpredict the role of dynamics at near-barrier energies. High-quality measurement of above-barrier fusion for an isotopic chain of increasingly neutron-rich nuclei provides an effective means to probe this fusion dynamics. \\ ( https://arxiv.org/abs/2004.13627 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:2004.13669 (*cross-listing*) Date: Tue, 28 Apr 2020 17:13:41 GMT (12kb) Title: Program to calculate coefficients of transformations between three-particle hyperspherical harmonics Authors: Victor D. Efros Categories: physics.comp-ph nucl-th physics.atom-ph Comments: 14 pages, to appear in Comput. Phys. Commun \\ A program to calculate the three-particle hyperspherical brackets is presented. Test results are listed and it is seen that the program is well applicable up to very high values of the hypermomentum and orbital momenta. The listed runs show that it is also very fast. Applications of the brackets to calculating interaction matrix elements and constructing hyperspherical bases for identical particles are described. Comparisons are done with the programs published previously. \\ ( https://arxiv.org/abs/2004.13669 , 12kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1908.10323 (*cross-listing*) replaced with revised version Tue, 28 Apr 2020 17:09:49 GMT (257kb,D) Title: Neutral pion mass in the linear sigma model coupled to quarks at arbitrary magnetic field Authors: Aritra Das and Najmul Haque Categories: hep-ph nucl-th Comments: 17 pages, 8 figures, v2, published version Journal-ref: Phys. Rev. D 101, 074033 (2020) DOI: 10.1103/PhysRevD.101.074033 \\ ( https://arxiv.org/abs/1908.10323 , 257kb) ------------------------------------------------------------------------------ \\ arXiv:1909.07171 replaced with revised version Tue, 28 Apr 2020 06:44:42 GMT (4396kb) Title: Particle-vibration coupling for giant resonances beyond the diagonal approximation Authors: Shihang Shen, Gianluca Col\`o, and Xavier Roca-Maza Categories: nucl-th Comments: 22 pages, 18 figures Journal-ref: Phys. Rev. C 101, 044316 (2020) DOI: 10.1103/PhysRevC.101.044316 \\ ( https://arxiv.org/abs/1909.07171 , 4396kb) ------------------------------------------------------------------------------ \\ arXiv:2001.03859 replaced with revised version Tue, 28 Apr 2020 08:03:31 GMT (184kb) Title: Nucleon effective mass in hot dense matter Authors: X. L. Shang, A. Li, Z. Q. Miao, G. F. Burgio, H.-J. Schulze Categories: nucl-th astro-ph.HE astro-ph.SR Comments: version accepted for publication in Physical Review C \\ ( https://arxiv.org/abs/2001.03859 , 184kb) ------------------------------------------------------------------------------ \\ arXiv:2003.03765 replaced with revised version Tue, 28 Apr 2020 14:38:05 GMT (60kb,D) Title: Chiral phase transition in a rotating sphere Authors: Zheng Zhang, Chao Shi, Xiaofeng Luo and Hong-Shi Zong Categories: nucl-th Journal-ref: Phys. Rev. D 101, 074036 (2020) DOI: 10.1103/PhysRevD.101.074036 \\ ( https://arxiv.org/abs/2003.03765 , 60kb) ------------------------------------------------------------------------------ \\ arXiv:2004.08778 (*cross-listing*) replaced with revised version Tue, 28 Apr 2020 06:11:58 GMT (510kb,AD) Title: Magnetic susceptibility of QCD matter and its decomposition from the lattice Authors: Gunnar S. Bali (1 and 2), Gergely Endr\H{o}di (3 and 4), Stefano Piemonte (1) ((1) Regensburg U., (2) Tata Inst., (3) Bielefeld U., (4) Frankfurt U.) Categories: hep-lat hep-ph nucl-th Comments: 39 pages, 11 figures, 1 ancillary python script, v2: 1 new figure, new reference, minor changes \\ ( https://arxiv.org/abs/2004.08778 , 510kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arxiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arxiv.org/help/