Importance of ({ital n},{ital p}) reactions for stellar beta decay rates

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.53.3139· OSTI ID:284796

Aufderheide, M B ^[1]; Bloom, S D; Mathews, G J ^[2]; Resler, D A ^[2]

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1. L-170, B Division, Defense and Nuclear Technology Directorate, Lawrence Livermore National Lab., P.O. Box 808, Livermore, California 94551 (United States)
2. L-59, Physics and Space Technology Directorate, Lawrence Livermore National Lab., P.O. Box 808, Livermore, California 94551 (United States)

Recent ({ital n},{ital p}) experiments on {sup 54}Fe, {sup 56}Fe, {sup 58}Ni, and {sup 59}Co have measured Gamow-Teller resonances which are crucial for determining stellar beta decay rates in {sup 54}Mn, {sup 56}Mn, {sup 58}Co, and {sup 59}Fe, respectively. These nuclei are important players in the iron-core URCA process, which is a dynamic balancing of electron capture and beta decay rates during the final stage of nuclear burning in massive stars. We find that three of the nuclei, after calibration from ({ital n},{ital p}) measurements, have significantly stronger decay rates than currently expected. These stronger rates will cause a more vigorous URCA process, resulting in presupernova cores which are cooler and less neutron rich than is presently used in core collapse calculations. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: University of Pennsylvania
• DOE Contract Number: AC02-76ER03071; W-7405-ENG-48
• OSTI ID: 284796
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 53; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BETA DECAY
COBALT 58 TARGET
COBALT 59 TARGET
ELECTRON CAPTURE
GAMOW-TELLER RULES
IRON 54 TARGET
IRON 56 TARGET
MANGANESE 54 TARGET
NEUTRON REACTIONS
NICKEL 58 TARGET
PROTONS
RESONANCE