Barranco, F. and Potel, G. and Vigezzi, E. (2024) Giant Pairing Vibration in the continuum beyond RPA. Il nuovo cimento C, 47 (2). pp. 1-8. ISSN 1826-9885
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Abstract
The possibility of the existence of collective pairing modes (Jπ = 0+) lying at high excitation energy (10-15 MeV) resulting from the correlated two-particle or two-hole excitation across major shells, was formulated in the 70’s by Bes and Broglia, and today these modes are known as the Giant Pairing Vibrations (GPV). Since then there have been numerous unsuccessful attempts to detect them, and recently a bump has been reported in the excitation spectrum of 14C produced by the reaction 12C(18O,16O)14C, that was proposed to be a signature of the GPV. In this contribution we present a microscopic calculation of the response function of 12C to the creation operator of two neutrons coupled to 0+, including the coupling to the continuum. We carry out a pp-RPA calculation, obtaining a concentration of ∗ below threshold in reasonable agreement with the two observed discrete excited 0+∗≈ 13 MeV) based on s and d orbitals, which displays the general features expected for a GPV. We then take into account the coupling between the neutron degrees of freedom and the low-lying collective quadrupole vibrations of the core, that shifts and fragments the sd strength, producing two states strength close to threshold (E states, as well as a bump in the continuum (E ≈ 18 MeV).
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 20 May 2024 14:13 |
| Last Modified: | 20 May 2024 14:13 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/22874 |
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