Title: Mass measurement of 51Fe for the determination of the 51Fe($p, γ$) 52Co reaction rate

Journal Article · · Physical Review C
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [6];  [6];  [7];  [5];  [8];  [5];  [5];  [6];  [9];  [6]
  1. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States); DOE/OSTI
  2. Univ. of Notre Dame, IN (United States)
  3. Michigan State Univ., East Lansing, MI (United States); Facility for Rare Isotope Beams, East Lansing, MI (United States)
  4. Ernst-Moritz-Arndt-Univ., Greifswald (Germany); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  5. National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  6. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  7. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
  8. Central Michigan Univ., Mount Pleasant, MI (United States)
  9. Facility for Rare Isotope Beams, East Lansing, MI (United States)
+ Show Author Affiliations

Background: The 51Fe(p, γ) 52Co reaction lies along the main rp-process path leading up to the 56Ni waiting point. The uncertainty in the reaction Q value, which determines the equilibrium between the forward protoncapture and reverse photodisintegration 52Co(γ,p)51Fe reaction, contributes to considerable uncertainty in the reaction rate in the temperature range of interest for Type I x-ray bursts and thus to an ≈10% uncertainty in burst ashes lighter than A = 56. Purpose: With a recent Penning trap mass measurement of 52Co reducing the uncertainty on its mass to 6.6 keV [Nesterenko et al., J. Phys. G 44, 065103 (2017)], the dominant source of uncertainty in the reaction Q value is now the mass of 51Fe, reported in the 2016 atomic mass evaluation to a precision of 9 keV [Wang et al., Chin.Phys. C 41, 030003 (2017)]. A new, high-precision Penning trap mass measurement of 51Fe was performed to allow the determination of an improved precision Q value and thus new reaction rates. Method: 51Fe was produced using projectile fragmentation at the Coupled Cyclotron Facility at the National Superconducting Cyclotron Laboratory, and separated using the A1900 fragment separator. The resulting secondary beam was then thermalized in the beam stopping area before a mass measurement was performed using the LEBIT 9.4T Penning trap mass spectrometer. Results: The new mass excess, ME = -40189.2(1.6) keV, is sixfold more precise than the current AME value, and 1.6σ less negative. This value was used to calculate a new proton separation energy for 52Co of 1431(7) keV. New excitation levels were then calculated for 52Co using the NUSHELLX code with the GXPF1A interaction, and a new reaction rate and burst ash composition was calculated. Conclusions:With a new measured Q value, the uncertainty on the 51Fe(p, γ ) reaction rate is dominated by the poorly measured 52Co level structure. Finally, reducing this uncertainty would allow a more precise rate calculation and a better determination of the mass abundances in the burst ashes.

Research Organization:
Central Michigan Univ., Mount Pleasant, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC52-07NA27344; SC0015927
OSTI ID:
1612349
Report Number(s):
LLNL-JRNL-826153
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 98; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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radioactive beams
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