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β -delayed neutron emission of Mn 64 ,  Cr 62 , and Fe 65

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [7];  [2];  [2];  [2];  [8];  [2];  [2];  [9];  [10];  [11]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Michigan State Univ., East Lansing, MI (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  4. Michigan State Univ., East Lansing, MI (United States); Texas A & M Univ., College Station, TX (United States); Institute for Basic Science, Daejeon (Korea, Republic of)
  5. Michigan State Univ., East Lansing, MI (United States); Remote Sensing Laboratory (RSL), Las Vegas, NV (United States)
  6. Mississippi State Univ., Mississippi State, MS (United States)
  7. Goethe Univ., Frankfurt (Germany); University of Applied Sciences Aachen (Germany)
  8. Michigan State Univ., East Lansing, MI (United States); Ohio Univ., Athens, OH (United States)
  9. Michigan State Univ., East Lansing, MI (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  10. Michigan State Univ., East Lansing, MI (United States); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  11. Michigan State University; Facility for Rare Isotope Beams; Michigan State University; Joint Institute for Nuclear Astrophysics; Michigan State University
+ Show Author Affiliations

The β-decay properties of nuclei near the second nuclear “island of inversion” around neutron rich nuclei with neutron number 40 are important tests of nuclear structure models and interactions. In particular, the β-delayed neutron emission branch (Ρn), is useful for investigating β-strength and neutron-γ competition above the neutron separation energies of the daughter nuclei. We report new constraints for Ρn values for three nuclei in the region: 62Cr (Ρn<1%), 64Mn (Ρn = 1.5⁢(6)%), and 65Fe (Ρn < 1%), measured with the Neutron Emission Ratio Observer (NERO) neutron long counter system and the Beta Counting Station (BCS) at the National Superconducting Cyclotron Laboratory (NSCL). Our results resolve the large discrepancy between previous direct and indirect measurements for 64Mn and confirm the predictions of global theoretical models when a statistical treatment of the γ and neutron decays of the daughter states is included. Here we also obtain improved half-lives for 62Cr [206(5) ms] and the short-lived isomer in the 62Fe daughter [112(7) ms] from β-delayed γ emission data obtained in the same experiment with the Summing NaI (SuN) total absorption spectrometer. Finally, we use γ emission data to obtain a new upper limit for the 62Cr β-decay population of the long-lived isomeric state in 62Mn.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC52-07NA27344; NA0003906; NA0003180
OSTI ID:
2438190
Alternate ID(s):
OSTI ID: 2473940
Report Number(s):
LLNL--JRNL-860289; 1091685
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 110; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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