Nuclear Theory·nucl-th
15 papers—12 primary·3 cross-listed
S. Aldaihan🇺🇸 · W.M. Snow🇺🇸 · D.E. Krause🇺🇸 · J.C. Long🇺🇸 · E. Fischbach🇺🇸
Present laboratory limits on the coupling strength of anomalous pseudoscalar and axial interactions are many orders of magnitude weaker than their scalar and vector analogs. Here we investigate two mechanisms which can circumvent this suppression and thereby lead to improved limits.
Dibyadyuti Pramanik · S. Sarkar · M. Saha Sarkar · Abhijit Bisoi · Sudatta Ray · Shinjinee Dasgupta · A.Chakraborty · Krishichayan · Ritesh Kshetri · Indrani Ray · S. Ganguly · M. K. Pradhan and 10 other authors
The high-spin states in 153Ho, have been studied by 139 57 La(20Ne, 6n) reaction at a projectile energy of 139 MeV at Variable Energy Cyclotron Centre (VECC), Kolkata, India, utilizing an earlier campaign of Indian National Gamma Array (INGA) setup. Data from gamma-gamma coincidence, directional correlation and polarization measurements have been analyzed to assign and confirm the spins and parities of the levels. We have suggested a few additions and revisions of the reported level scheme of 153Ho. The RF-gamma time difference spectra have been useful to confirm the half-life of an isomer in this nucleus. From the comparison of experimental and theoretical results, it is found that there are definite indications of shape coexistence in this nucleus. The experimental and calculated lifetimes of several isomers have been compared to follow the coexistence and evolution of shape with increasing spin.
Takeshi Mizushima · Kota Masuda · Muneto Nitta
We clarify topology of superfluids which are expected to be realized in the inner cores of neutron stars and cubic odd-parity superconductors. phases include uniaxial/biaxial nematic phases and nonunitary ferromagnetic and cyclic phases. We here show that all the phases are accompanied by different types of topologically protected gapless fermions: Surface Majorana fermions in nematic phases and a quartet of (single) itinerant Majorana fermions in the cyclic (ferromagnetic) phase. Using the superfluid Fermi liquid theory, we also demonstrate that dihedral-two and -four biaxial nematic phases are thermodynamically favored in the weak coupling limit under a magnetic field. It is shown that the tricritical point exists on the phase boundary between these two phases and may be realized in the core of realistic magnetars. We unveil the intertwining of symmetry and topology behind mass acquisition of surface Majorana fermions in nematic phases.
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