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High-precision mass measurements of the isomeric and ground states of 44V: Improving constraints on the isobaric multiplet mass equation parameters of the A=44, 0+ quintet

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [9];  [10];  [9];  [10];  [11];  [12];  [6];  [3];  [13];  [6]
  1. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States); Central Michigan University
  2. Michigan State Univ., East Lansing, MI (United States); Facility for Rare Isotope Beams, East Lansing, MI (United States)
  3. Univ. of Notre Dame, IN (United States)
  4. Ernst-Moritz-Arndt-Univ., Greifswald (Germany)
  5. Central Michigan Univ., Mount Pleasant, MI (United States)
  6. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  7. Univ. of Padova (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)
  8. Univ. Paris-Saclay, Orsay (France)
  9. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
  10. National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  11. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  12. Univ. of Bordeaux, Gradignan (France)
  13. Facility for Rare Isotope Beams, East Lansing, MI (United States)
+ Show Author Affiliations
Background: The quadratic isobaric multiplet mass equation (IMME) has been very successful at predicting the masses of isobaric analog states in the same multiplet, while its coefficients are known to follow specific trends as functions of mass number. The Atomic Mass Evaluation 2016 [Chin. Phys. C 41, 030003 (2017)] 44V mass value results in an anomalous negative c coefficient for the IMME quadratic term; a consequence of large uncertainty and an unresolved isomeric state. The b and c coefficients can provide useful constraints for construction of the isospin-nonconserving Hamiltonians for the pf shell. In addition, the excitation energy of the 0+, T = 2 level in 44V is currently unknown. This state can be used to constrain the mass of the more exotic 44Cr. Purpose: The aim of the experimental campaign was to perform high-precision mass measurements to resolve the difference between 44V isomeric and ground states, to test the IMME using the new ground state mass value and to provide necessary ingredients for the future identification of the 0+, T = 2 state in 44V. Method: High-precision Penning trap mass spectrometry was performed at LEBIT, located at the National Superconducting Cyclotron Laboratory, to measure the cyclotron frequency ratios of [44g,mVO]+ versus [32SCO]+, a well-known reference mass, to extract both the isomeric and ground state masses of 44V. Results: The mass excess of the ground and isomeric states in 44V were measured to be -23 804.9(80) keV/c2 and -23 537.0(55) keV/c2, respectively. This yielded a new proton separation energy of Sp = 1 773(10) keV. Conclusion: The new values of the ground state and isomeric state masses of 44V have been used to deduce the IMME b and c coefficients of the lowest 2+ and 6+ triplets in A = 44. The 2+ c coefficient is now verified with the IMME trend for lowest multiplets and is in good agreement with the shell-model predictions using charge-dependent Hamiltonians. The mirror energy differences were determined between 44V and 44Sc, in line with isospin-symmetry for this multiplet. Finally, the new value of the proton separation energy determined, to an uncertainty of 10 keV, will be important for the determination of the 0+, T = 2 state in 44V and, consequently, for prediction of the mass excess of 44Cr.
Research Organization:
Central Michigan Univ., Mount Pleasant, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0015927
OSTI ID:
1674966
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 101; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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