Pairing correlations in excited states of superfluid nuclei

Akkermans, J.; Allaart, K.; Boeker, Egbert

doi:10.1016/0375-9474(77)90216-0

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…First the superfluidity parameters u,,v a are obtained from gap equations which account for a reduction of the pairing by the presence of three quasiparticles [39]. Then the set of basis states (2.1) and (2.2) is constructed and the Shell Model Hamiltonian is diagonalized within the space of number-projected states to obtain energies and wave functions.…”

Section: Calculation Of the Spectroscopic Properties Of The Odd Nucleimentioning

confidence: 99%

Number-projected three-quasiparticle description of the odd Sn isotopes

1978

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An account is given of the description of the low-energy properties of the odd Sn nuclei in terms of number projected one-(1 q.p.) and three-quasiparticle (3 q.p.) states. The shell model space for the neutrons consists of one major shell. A simple Gaussian force is used as an effective interaction. Its strength and the single-particle energies, which are the only parameters, are derived in a consistent way from spectroscopic data on the onequasiparticle states. We find that the spectra can be well interpreted in terms of l q.p. and 3q.p. states. Branching ratios of gamma decay, one-nucleon transfer spectroscopic factors, electric and magnetic moments show generally good agreement with the experimental data. For halflives and mixing ratios, which are most sensitive to details of the 3 q.p. components, the agreement is less, but all have the correct order of magnitude.

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Section: Calculation Of the Spectroscopic Properties Of The Odd Nucleimentioning

confidence: 99%

Number-projected three-quasiparticle description of the odd Sn isotopes

1978

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“…The BCS-parameters vo, u a are determined such that the presence of unpaired particles is accounted for in an average way [23]. The technique how to calculate matrix elements of a shell model hamiltonian in the space of states (2.1) and (2.2), coupled to proper angular momenta, is well known [15,21].…”

Section: The Model Spacementioning

confidence: 99%

“…So far this model has 0340-2193/79/0292/0159/$02.20 been applied to odd Sn nuclei only [21,22]. Since it is known [23] that in Sn nuclei certain deformed structures may appear at rather low excitation energy, the N = 50 isotones might be more suitable for the application of the model. As the description of the odd nuclei can only be expected to be successful when also the lowest (collective) excited states can be described by the same method, these states are considered first, and improved by the inclusion of neutron particle-hole excitations.…”

Section: Introductionmentioning

confidence: 99%

A broken-pair description of89Y,91Nb and93Tc

Hofstra

Allaart

1979

Z Physik A

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The low-energy properties of 89y, 91Nb and 93Tc are described in a broken-pair model. The shell model space for the protons consists of one major shell and for the neutrons particle-hole states within two major shells are taken into account. The effective interaction is assumed to be a simple Gaussian Serber force, which has proved to be the most successful in adjacent even nuclei. Energy spectra up to about 3 MeV excitation energy and one-nucleon transfer data can be described very well. Also electromagnetic properties can be reproduced rather well if reasonable effective charges are used. No indication for deformed states, as found in Sn nuclei, is observed.

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Nuclear Data Sheets for A = 91

Baglin

1999

Nuclear Data Sheets

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Pairing correlations in excited states of superfluid nuclei

Cited by 15 publications

References 12 publications

Number-projected three-quasiparticle description of the odd Sn isotopes

Number-projected three-quasiparticle description of the odd Sn isotopes

A broken-pair description of89Y,91Nb and93Tc

Nuclear Data Sheets for A = 91

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