dorsal/arxiv
View SchemaQuadrupole Deformation of Barium Isotopes
| Authors | M. Sugita, K. Uchiyama, K. Furuno |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9811093 |
| URL | https://arxiv.org/abs/nucl-th/9811093 |
| DOI | 10.1016/S0370-2693(98)01181-2 |
| Journal | Phys.Lett. B440 (1998) 239-245 |
Abstract
The B(E2:0_1^+ -> 2_1^+) values of the Ba isotopes (Z=56) exhibit a sharp increase in deformation as the neutron numbers approach the mid-shell value of N=66. This behavior is anomalous because the 2_1^+ level energies are very similar to those of the neighboring isotopes. By means of the axially-symmetric deformed Woods-Saxon (WS) hamiltonian plus the BCS method, we investigated the systematics of B(E2) of the Ba isotopes. We showed that 15% of the B(E2) values at N=66 was due to the level crossing, occurring at the deformation with beta being nearly 0.3, between the proton orbits originating from the orbits Omega=1/2^-(h11/2) and 9/2^+(g9/2) at zero deformation. The latter of these two was an intruder orbit originating from below the energy gap at Z=50, rising higher in energy with the deformation and intruding the Z=50-82 shell. These two orbits have the largest magnitude of the quadrupole moment with a different sign among the orbits near and below the Fermi surface. Occupancy and non-occupancy of these orbits by protons thus affect B(E2:0_1^+ -> 2_1^+) significantly.
{
"annotation_id": "518cbc7b-da15-43b4-891c-5dbd987e18e0",
"date_created": "2026-03-02T18:00:25.836000Z",
"date_modified": "2026-03-02T18:00:25.836000Z",
"file_hash": "8b00131bf5010bbe2131781afc984e84199e4c24db72f800a09cff9fcf7d72cf",
"private": false,
"record": {
"abstract": "The B(E2:0_1^+ -\u003e 2_1^+) values of the Ba isotopes (Z=56) exhibit a sharp\nincrease in deformation as the neutron numbers approach the mid-shell value of\nN=66. This behavior is anomalous because the 2_1^+ level energies are very\nsimilar to those of the neighboring isotopes. By means of the axially-symmetric\ndeformed Woods-Saxon (WS) hamiltonian plus the BCS method, we investigated the\nsystematics of B(E2) of the Ba isotopes. We showed that 15% of the B(E2) values\nat N=66 was due to the level crossing, occurring at the deformation with beta\nbeing nearly 0.3, between the proton orbits originating from the orbits\nOmega=1/2^-(h11/2) and 9/2^+(g9/2) at zero deformation. The latter of these two\nwas an intruder orbit originating from below the energy gap at Z=50, rising\nhigher in energy with the deformation and intruding the Z=50-82 shell. These\ntwo orbits have the largest magnitude of the quadrupole moment with a different\nsign among the orbits near and below the Fermi surface. Occupancy and\nnon-occupancy of these orbits by protons thus affect B(E2:0_1^+ -\u003e 2_1^+)\nsignificantly.",
"arxiv_id": "nucl-th/9811093",
"authors": [
"M. Sugita",
"K. Uchiyama",
"K. Furuno"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0370-2693(98)01181-2",
"journal_ref": "Phys.Lett. B440 (1998) 239-245",
"title": "Quadrupole Deformation of Barium Isotopes",
"url": "https://arxiv.org/abs/nucl-th/9811093"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "999540fe-a580-4eeb-8dc6-ec53da87d870",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}