Pair transfer at high angular momenta

Shape vibration and quasiparticle excitations in the lowest0+excited state in erbium isotopes

“…We would lastly mention that a potential application of the theory would be the calculation of neutron pair transfer to investigate the K = 0 + bands [1]. Two neutron transfer in deformed nuclei is usually calculated in the HFB or QRPA theories [48,49]. For deformed superfluid nuclei the particle number and the angular momentum are not conserved quantities and the use of a symmetry conserving theory like the one presented in this work may reveal important clues on the pair transfer phenomenon.…”

Pair transfer spectral function at finite temperature in nanometer-scale superconducting grains

“…Actually, when ⌬ is a nonzero solution of Eq. ͑21͒, the lowest RPA mode vanishes 17,15 while the corresponding amplitude diverges, with R RPA (Ē )ϰĒ Ϫ2 for Ē →0. In actual calculations with finite width , one must exclude the zero mode from Eq.…”

“…The aim of this work is to examine the spectral function for Cooper pair transfer, i.e., the spectral decomposition of the Cooper pair creation operator. In nuclear physics, this quantity ͑pair transfer strength function 17 ͒ has been studied in connection with pair absorption or removal reactions, 18,19 and exhibits a very high sensitivity to pairing correlations, which strongly enhance pair transfer matrix elements between superconducting ground states. 18,19 In fact, it has been employed to reveal signatures of pairing effects in nuclei at high spin 17 ͑i.e., large rotational frequency͒, where superconductivity may be gapless and hence hard to detect through observation of the spectrum, and may even be absent at the BCS level due to the Mottelson-Valatin effect.…”