Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis

H. Nassar; M. Paul; I. Ahmad; Y. Ben-Dov; J. Caggiano; S. Ghelberg; S. Goriely; J. P. Greene; M. Hass; A. Heger; A. Heinz; D. J. Henderson; R. V.F. Janssens; C. L. Jiang; Y. Kashiv; B. S. Nara Singh; A. Ofan; R. C. Pardo; T. Pennington; K. E. Rehm; G. Savard; R. Scott; R. Vondrasek

doi:10.1103/PhysRevLett.96.041102

Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis

H. Nassar, M. Paul, I. Ahmad, Y. Ben-Dov, J. Caggiano, S. Ghelberg, S. Goriely, J. P. Greene, M. Hass, A. Heger, A. Heinz, D. J. Henderson, R. V.F. Janssens, C. L. Jiang, Y. Kashiv, B. S. Nara Singh, A. Ofan, R. C. Pardo, T. Pennington, K. E. RehmG. Savard, R. Scott, R. Vondrasek

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Abstract

The Ti44(t1/2=59yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by γ-ray astronomy from the Cas A remnant. We investigate in the laboratory the major Ti44 production reaction Ca40(α,γ)Ti44 (Ec.m.∼0.6-1.2MeV/u) by direct off-line counting of Ti44 nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova Ti44 yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

Original language	English
Article number	041102
Journal	Physical Review Letters
Volume	96
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.96.041102
Publication status	Published - 1 Jan 2006
Externally published	Yes

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Nassar, H., Paul, M., Ahmad, I., Ben-Dov, Y., Caggiano, J., Ghelberg, S., Goriely, S., Greene, J. P., Hass, M., Heger, A., Heinz, A., Henderson, D. J., Janssens, R. V. F., Jiang, C. L., Kashiv, Y., Nara Singh, B. S., Ofan, A., Pardo, R. C., Pennington, T., ... Vondrasek, R. (2006). Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis. Physical Review Letters, 96(4), Article 041102. https://doi.org/10.1103/PhysRevLett.96.041102

@article{e943643049024df0b460597a401e9721,

title = "Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis",

abstract = "The Ti44(t1/2=59yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by γ-ray astronomy from the Cas A remnant. We investigate in the laboratory the major Ti44 production reaction Ca40(α,γ)Ti44 (Ec.m.∼0.6-1.2MeV/u) by direct off-line counting of Ti44 nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova Ti44 yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.",

author = "H. Nassar and M. Paul and I. Ahmad and Y. Ben-Dov and J. Caggiano and S. Ghelberg and S. Goriely and Greene, {J. P.} and M. Hass and A. Heger and A. Heinz and Henderson, {D. J.} and Janssens, {R. V.F.} and Jiang, {C. L.} and Y. Kashiv and {Nara Singh}, {B. S.} and A. Ofan and Pardo, {R. C.} and T. Pennington and Rehm, {K. E.} and G. Savard and R. Scott and R. Vondrasek",

year = "2006",

month = jan,

day = "1",

doi = "10.1103/PhysRevLett.96.041102",

language = "English",

volume = "96",

journal = "Physical Review Letters",

issn = "0031-9007",

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Nassar, H, Paul, M, Ahmad, I, Ben-Dov, Y, Caggiano, J, Ghelberg, S, Goriely, S, Greene, JP, Hass, M, Heger, A, Heinz, A, Henderson, DJ, Janssens, RVF, Jiang, CL, Kashiv, Y, Nara Singh, BS, Ofan, A, Pardo, RC, Pennington, T, Rehm, KE, Savard, G, Scott, R & Vondrasek, R 2006, 'Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis', Physical Review Letters, vol. 96, no. 4, 041102. https://doi.org/10.1103/PhysRevLett.96.041102

TY - JOUR

T1 - Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis

AU - Nassar, H.

AU - Paul, M.

AU - Ahmad, I.

AU - Ben-Dov, Y.

AU - Caggiano, J.

AU - Ghelberg, S.

AU - Goriely, S.

AU - Greene, J. P.

AU - Hass, M.

AU - Heger, A.

AU - Heinz, A.

AU - Henderson, D. J.

AU - Janssens, R. V.F.

AU - Jiang, C. L.

AU - Kashiv, Y.

AU - Nara Singh, B. S.

AU - Ofan, A.

AU - Pardo, R. C.

AU - Pennington, T.

AU - Rehm, K. E.

AU - Savard, G.

AU - Scott, R.

AU - Vondrasek, R.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - The Ti44(t1/2=59yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by γ-ray astronomy from the Cas A remnant. We investigate in the laboratory the major Ti44 production reaction Ca40(α,γ)Ti44 (Ec.m.∼0.6-1.2MeV/u) by direct off-line counting of Ti44 nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova Ti44 yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

AB - The Ti44(t1/2=59yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by γ-ray astronomy from the Cas A remnant. We investigate in the laboratory the major Ti44 production reaction Ca40(α,γ)Ti44 (Ec.m.∼0.6-1.2MeV/u) by direct off-line counting of Ti44 nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova Ti44 yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

UR - http://www.scopus.com/inward/record.url?scp=33144456041&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.96.041102

DO - 10.1103/PhysRevLett.96.041102

M3 - Article

AN - SCOPUS:33144456041

SN - 0031-9007

VL - 96

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 041102

ER -

Ca40(α,γ)Ti44 reaction in the energy regime of supernova nucleosynthesis

Abstract

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