alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19

B Davids; AM van den Berg; P Dendooven; F Fleurot; M Hunyadi; MA de Huu; KE Rehm; RE Segel; RH Siemssen; HW Wilschut; HJ Wortche; AH Wuosmaa

doi:10.1103/PhysRevC.67.012801

alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19

B Davids^*
, AM van den Berg
, P Dendooven
, F Fleurot
, M Hunyadi
, MA de Huu
, KE Rehm
, RE Segel
, RH Siemssen
, HW Wilschut
, HJ Wortche
, AH Wuosmaa

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

18 Citations (Scopus)

Abstract

The O-15(alpha,gamma)Ne-19 reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in Ne-19 lying just above the O-15+alpha threshold. We have measured the alpha-decay branching ratios for these states using the p(Ne-21,t)Ne-19 reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via O-15(alpha,gamma)Ne-19, assuming that current models accurately represent their temperature and density conditions.

Original language	English
Article number	012801
Number of pages	4
Journal	Nuclear Physics A
Volume	718
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.67.012801
Publication status	Published - Jan-2003
Event	7th International Symposium on Nuclei in the Cosmos (NIC7) - , Japan Duration: 8-Jul-2002 → 12-Jul-2002

Keywords

CLASSICAL NOVAE
WHITE-DWARFS
RP PROCESS
NUCLEOSYNTHESIS
N-15(ALPHA,GAMMA)F-19
STRENGTHS
ELEMENTS

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alpha-decay branching ratios of near-threshold states in Ne-19
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Davids, B., van den Berg, AM., Dendooven, P., Fleurot, F., Hunyadi, M., de Huu, MA., Rehm, KE., Segel, RE., Siemssen, RH., Wilschut, HW., Wortche, HJ., & Wuosmaa, AH. (2003). alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19. Nuclear Physics A, 718(1), Article 012801. https://doi.org/10.1103/PhysRevC.67.012801

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title = "alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19",

abstract = "The O-15(alpha,gamma)Ne-19 reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in Ne-19 lying just above the O-15+alpha threshold. We have measured the alpha-decay branching ratios for these states using the p(Ne-21,t)Ne-19 reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via O-15(alpha,gamma)Ne-19, assuming that current models accurately represent their temperature and density conditions.",

keywords = "CLASSICAL NOVAE, WHITE-DWARFS, RP PROCESS, NUCLEOSYNTHESIS, N-15(ALPHA,GAMMA)F-19, STRENGTHS, ELEMENTS",

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doi = "10.1103/PhysRevC.67.012801",

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T1 - alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19

AU - Davids, B

AU - van den Berg, AM

AU - Dendooven, P

AU - Fleurot, F

AU - Hunyadi, M

AU - de Huu, MA

AU - Rehm, KE

AU - Segel, RE

AU - Siemssen, RH

AU - Wilschut, HW

AU - Wortche, HJ

AU - Wuosmaa, AH

PY - 2003/1

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N2 - The O-15(alpha,gamma)Ne-19 reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in Ne-19 lying just above the O-15+alpha threshold. We have measured the alpha-decay branching ratios for these states using the p(Ne-21,t)Ne-19 reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via O-15(alpha,gamma)Ne-19, assuming that current models accurately represent their temperature and density conditions.

AB - The O-15(alpha,gamma)Ne-19 reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in Ne-19 lying just above the O-15+alpha threshold. We have measured the alpha-decay branching ratios for these states using the p(Ne-21,t)Ne-19 reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via O-15(alpha,gamma)Ne-19, assuming that current models accurately represent their temperature and density conditions.

KW - CLASSICAL NOVAE

KW - WHITE-DWARFS

KW - RP PROCESS

KW - NUCLEOSYNTHESIS

KW - N-15(ALPHA,GAMMA)F-19

KW - STRENGTHS

KW - ELEMENTS

U2 - 10.1103/PhysRevC.67.012801

DO - 10.1103/PhysRevC.67.012801

M3 - Article

SN - 0375-9474

VL - 718

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1

M1 - 012801

T2 - 7th International Symposium on Nuclei in the Cosmos (NIC7)

Y2 - 8 July 2002 through 12 July 2002

ER -

alpha-decay branching ratios of near-threshold states in Ne-19 and the astrophysical rate of O-15(alpha,gamma)Ne-19

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Keywords

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