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      "statement": "The Authors", 
      "year": "2021"
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        {
          "country": "Italy", 
          "value": "Istituto Nazionale di Fisica Nucleare - Sezione di Catania, Catania, Italy"
        }
      ], 
      "surname": "Sambataro", 
      "given_names": "M.", 
      "full_name": "Sambataro, M."
    }, 
    {
      "affiliations": [
        {
          "country": "Romania", 
          "value": "National Institute of Physics and Nuclear Engineering, M\u0103gurele, Romania"
        }
      ], 
      "surname": "Sandulescu", 
      "email": "sandulescu@theory.nipne.ro", 
      "full_name": "Sandulescu, N.", 
      "given_names": "N."
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  "titles": [
    {
      "source": "Elsevier", 
      "title": "-Like quartetting in the excited states of proton-neutron pairing Hamiltonians"
    }
  ], 
  "collections": [
    {
      "primary": "Physics Letters B"
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      "value": "10.1016/j.physletb.2021.136476"
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  "publication_info": [
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      "journal_volume": "820 C", 
      "journal_title": "Physics Letters B", 
      "material": "article", 
      "artid": "136476", 
      "year": 2021
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  "abstracts": [
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      "source": "Elsevier", 
      "value": "Previous studies have shown that the ground state of systems of nucleons composed by an equal number of protons and neutrons interacting via proton-neutron pairing forces can be described accurately by a condensate of \u03b1-like quartets. Here we extend these studies to the low-lowing excited states of these systems and show that these states can be accurately described by breaking a quartet from the ground state condensate and replacing it with an \u201cexcited\u201d quartet. This approach, which is analogous to the one-broken-pair approximation employed for like-particle pairing, is analyzed for various isovector and isovector-isoscalar pairing Hamiltonians which can be solved exactly by diagonalization."
    }
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      "date": "2021-06-29", 
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