40Ca(α,γ)44Ti 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

40Ca(α,γ)44Ti 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 44Ti(t1/2=59 yr) 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 44Ti production reaction 40Ca(α,γ)44Ti (Ec.m.∼0.6–1.2
MeV/u) by direct off-line counting of 44Ti 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 44Ti yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

Original language	English
Article number	041102
Number of pages	4
Journal	Physical Review Letters
Volume	96
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.96.041102
Publication status	Published - 3 Feb 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). 40Ca(α,γ)44Ti reaction in the energy regime of supernova nucleosynthesis. Physical Review Letters, 96(4), Article 041102. https://doi.org/10.1103/PhysRevLett.96.041102

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title = "40Ca(α,γ)44Ti reaction in the energy regime of supernova nucleosynthesis",

abstract = "The 44Ti(t1/2=59 yr) 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 44Ti production reaction 40Ca(α,γ)44Ti (Ec.m.∼0.6–1.2 MeV/u) by direct off-line counting of 44Ti 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 44Ti 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 J.P. Greene and M. Hass and A. Heger and A. Heinz and D.J. Henderson and R.V.F. Janssens and C.L. Jiang and Y. Kashiv and {Nara Singh}, B.S. and A. Ofan and R.C. Pardo and T. Pennington and K.E. Rehm and G. Savard and R. Scott and R. Vondrasek",

year = "2006",

month = feb,

day = "3",

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, '40Ca(α,γ)44Ti 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 - 40Ca(α,γ)44Ti 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 - 2006/2/3

Y1 - 2006/2/3

N2 - The 44Ti(t1/2=59 yr) 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 44Ti production reaction 40Ca(α,γ)44Ti (Ec.m.∼0.6–1.2 MeV/u) by direct off-line counting of 44Ti 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 44Ti yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

AB - The 44Ti(t1/2=59 yr) 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 44Ti production reaction 40Ca(α,γ)44Ti (Ec.m.∼0.6–1.2 MeV/u) by direct off-line counting of 44Ti 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 44Ti yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.

U2 - 10.1103/PhysRevLett.96.041102

DO - 10.1103/PhysRevLett.96.041102

M3 - Article

SN - 0031-9007

VL - 96

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 041102

ER -

40Ca(α,γ)44Ti reaction in the energy regime of supernova nucleosynthesis

Abstract

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