Counting44Ti nuclei from the40Ca(α,γ )44Ti reaction

M. Paul; C. Feldstein; I. Ahmad; D. Berkovits; C. Bordeanu; J. Caggiano; S. Ghelberg; J. Goerres; J. Greene; M. Hass; A. Heinz; D. Henderson; Susanta K Hui; R. V.F. Janssens; C. L. Jiang; S. Jiang; Y. Nirel; R. C. Pardo; T. Pennington; K. E. Rehm; G. Savard; G. Verri; R. Vondrasek; I. Weidenhover; M. Wiescher

doi:10.1016/S0375-9474(03)00720-6

Counting⁴⁴Ti nuclei from the⁴⁰Ca(α,γ )⁴⁴Ti reaction

M. Paul, C. Feldstein, I. Ahmad, D. Berkovits, C. Bordeanu, J. Caggiano, S. Ghelberg, J. Goerres, J. Greene, M. Hass, A. Heinz, D. Henderson, Susanta K Hui, R. V.F. Janssens, C. L. Jiang, S. Jiang, Y. Nirel, R. C. Pardo, T. Pennington, K. E. RehmG. Savard, G. Verri, R. Vondrasek, I. Weidenhover, M. Wiescher

Radiation Oncology

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Abstract

Among the many production and destruction nuclear reactions that bear on the net⁴⁴Ti yield in the supernova environment, recently highlighted by γ-ray astronomy observations, the α capture on⁴⁰Ca stands out in the α-rich freezeout phase conjectured by astrophysical models. We activate a He-gas target, with a⁴⁰Ca beam and implant recoiling⁴⁴Ti nuclei (∼10⁶) in a Cu catcher. The⁴⁴Ti atoms chemically extracted with a^natTi carrier are counted by accelerator mass spectrometry (AMS). The measurement of the⁴⁴Ti/Ti ratio, together with the amount, of Ti carrier added, determine the number of⁴⁴Ti nuclei produced in the activation, independent, of chemical yield or transmission efficiency. The resonance strength (7.4±2.5 eV) at E_cm∼1.1 MeV/n determined for two close-by levels of⁴⁴Ti is in excellent agreement, with previous prompt-γ measurements. We plan to extend our experiments to the lower energy range.

Original language	English (US)
Pages (from-to)	239-242
Number of pages	4
Journal	Nuclear Physics A
Volume	723
Issue number	1-2
DOIs	https://doi.org/10.1016/S0375-9474(03)00720-6
State	Published - Jul 28 2003

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Paul, M., Feldstein, C., Ahmad, I., Berkovits, D., Bordeanu, C., Caggiano, J., Ghelberg, S., Goerres, J., Greene, J., Hass, M., Heinz, A., Henderson, D., Hui, S. K., Janssens, R. V. F., Jiang, C. L., Jiang, S., Nirel, Y., Pardo, R. C., Pennington, T., ... Wiescher, M. (2003). Counting⁴⁴Ti nuclei from the⁴⁰Ca(α,γ )⁴⁴Ti reaction. Nuclear Physics A, 723(1-2), 239-242. https://doi.org/10.1016/S0375-9474(03)00720-6

Paul, M, Feldstein, C, Ahmad, I, Berkovits, D, Bordeanu, C, Caggiano, J, Ghelberg, S, Goerres, J, Greene, J, Hass, M, Heinz, A, Henderson, D, Hui, SK, Janssens, RVF, Jiang, CL, Jiang, S, Nirel, Y, Pardo, RC, Pennington, T, Rehm, KE, Savard, G, Verri, G, Vondrasek, R, Weidenhover, I & Wiescher, M 2003, 'Counting⁴⁴Ti nuclei from the⁴⁰Ca(α,γ )⁴⁴Ti reaction', Nuclear Physics A, vol. 723, no. 1-2, pp. 239-242. https://doi.org/10.1016/S0375-9474(03)00720-6

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title = "Counting44Ti nuclei from the40Ca(α,γ )44Ti reaction",

abstract = "Among the many production and destruction nuclear reactions that bear on the net44Ti yield in the supernova environment, recently highlighted by γ-ray astronomy observations, the α capture on40Ca stands out in the α-rich freezeout phase conjectured by astrophysical models. We activate a He-gas target, with a40Ca beam and implant recoiling44Ti nuclei (∼106) in a Cu catcher. The44Ti atoms chemically extracted with anatTi carrier are counted by accelerator mass spectrometry (AMS). The measurement of the44Ti/Ti ratio, together with the amount, of Ti carrier added, determine the number of44Ti nuclei produced in the activation, independent, of chemical yield or transmission efficiency. The resonance strength (7.4±2.5 eV) at Ecm∼1.1 MeV/n determined for two close-by levels of44Ti is in excellent agreement, with previous prompt-γ measurements. We plan to extend our experiments to the lower energy range.",

author = "M. Paul and C. Feldstein and I. Ahmad and D. Berkovits and C. Bordeanu and J. Caggiano and S. Ghelberg and J. Goerres and J. Greene and M. Hass and A. Heinz and D. Henderson and Hui, {Susanta K} and Janssens, {R. V.F.} and Jiang, {C. L.} and S. Jiang and Y. Nirel and Pardo, {R. C.} and T. Pennington and Rehm, {K. E.} and G. Savard and G. Verri and R. Vondrasek and I. Weidenhover and M. Wiescher",

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T1 - Counting44Ti nuclei from the40Ca(α,γ )44Ti reaction

AU - Paul, M.

AU - Feldstein, C.

AU - Ahmad, I.

AU - Berkovits, D.

AU - Bordeanu, C.

AU - Caggiano, J.

AU - Ghelberg, S.

AU - Goerres, J.

AU - Greene, J.

AU - Hass, M.

AU - Heinz, A.

AU - Henderson, D.

AU - Hui, Susanta K

AU - Janssens, R. V.F.

AU - Jiang, C. L.

AU - Jiang, S.

AU - Nirel, Y.

AU - Pardo, R. C.

AU - Pennington, T.

AU - Rehm, K. E.

AU - Savard, G.

AU - Verri, G.

AU - Vondrasek, R.

AU - Weidenhover, I.

AU - Wiescher, M.

PY - 2003/7/28

Y1 - 2003/7/28

N2 - Among the many production and destruction nuclear reactions that bear on the net44Ti yield in the supernova environment, recently highlighted by γ-ray astronomy observations, the α capture on40Ca stands out in the α-rich freezeout phase conjectured by astrophysical models. We activate a He-gas target, with a40Ca beam and implant recoiling44Ti nuclei (∼106) in a Cu catcher. The44Ti atoms chemically extracted with anatTi carrier are counted by accelerator mass spectrometry (AMS). The measurement of the44Ti/Ti ratio, together with the amount, of Ti carrier added, determine the number of44Ti nuclei produced in the activation, independent, of chemical yield or transmission efficiency. The resonance strength (7.4±2.5 eV) at Ecm∼1.1 MeV/n determined for two close-by levels of44Ti is in excellent agreement, with previous prompt-γ measurements. We plan to extend our experiments to the lower energy range.

AB - Among the many production and destruction nuclear reactions that bear on the net44Ti yield in the supernova environment, recently highlighted by γ-ray astronomy observations, the α capture on40Ca stands out in the α-rich freezeout phase conjectured by astrophysical models. We activate a He-gas target, with a40Ca beam and implant recoiling44Ti nuclei (∼106) in a Cu catcher. The44Ti atoms chemically extracted with anatTi carrier are counted by accelerator mass spectrometry (AMS). The measurement of the44Ti/Ti ratio, together with the amount, of Ti carrier added, determine the number of44Ti nuclei produced in the activation, independent, of chemical yield or transmission efficiency. The resonance strength (7.4±2.5 eV) at Ecm∼1.1 MeV/n determined for two close-by levels of44Ti is in excellent agreement, with previous prompt-γ measurements. We plan to extend our experiments to the lower energy range.

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Counting⁴⁴Ti nuclei from the⁴⁰Ca(α,γ )⁴⁴Ti reaction

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