Decoherence of collective motion in warm nuclei
| Autor: | C. M. Petrache, S. Frauendorf, Ronald Schwengner, Kathrin Wimmer |
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| Přispěvatelé: | Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Quantum decoherence
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Nuclear Theory QC1-999 FOS: Physical sciences Zero-point energy Degree of coherence rotational damping 01 natural sciences Nuclear Theory (nucl-th) collective bands quantal coherence 0103 physical sciences magnetic rotation Scissors resonance 010306 general physics Physics 010308 nuclear & particles physics Yrast Collective motion in atomic nuclei thermal M1 radiation Excited state Quasiparticle Atomic physics Excitation Coherence (physics) |
| Zdroj: | European Physical Journal Web of Conferences 223(2019), 01017-1-01017-6 EPJ Web Conf. 4th International Conference on Nuclear Structure and Dynamics 4th International Conference on Nuclear Structure and Dynamics, May 2019, Venice, Italy. pp.01017, ⟨10.1051/epjconf/201922301017⟩ EPJ Web of Conferences, Vol 223, p 01017 (2019) |
| Popis: | Collective states in cold nuclei are represented by a wave function that assigns coherent phases to the participating nucleons. The degree of coherence decreases with excitation energy above the yrast line because of coupling to the increasingly dense background of quasiparticle excitations. The consequences of decoherence are discussed, starting with the well studied case of rotational damping. In addition to superdeformed bands, a highly excited oblate band is presented as a new example of screening from rotational damping. Suppression of pair correlation leads to incoherent thermal M1 radiation, which appears as an exponential spike (LEMAR) at zero energy in the $\gamma$ strength function of spherical nuclei. In deformed nuclei a Scissors Resonance appears and LEMAR changes to damped magnetic rotation, which is interpreted as partial restoration of coherence. Comment: Proceedings of the conference on Nuclear structure and dynamics 2019 |
| Databáze: | OpenAIRE |
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