Study of the 44Ti(α, p)47V reaction and implications for core collapse
supernovae

V. Margerin; A. Murphy; T. Davinson; R. Dressler; J. Fallis; A. Kankainen; A.M. Laird; G. Lotay; D.J. Mountford; C.D. Murphy; C. Seiffert; D. Schumann; T. Stowasser; T. Stora; C.H.-T. Wang; P.J. Woods

doi:10.1016/j.physletb.2014.03.003

Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae

V. Margerin, A. Murphy, T. Davinson, R. Dressler, J. Fallis, A. Kankainen, A.M. Laird, G. Lotay, D.J. Mountford, C.D. Murphy, C. Seiffert, D. Schumann, T. Stowasser, T. Stora, C.H.-T. Wang, P.J. Woods

School of Physics and Astronomy

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

Abstract

The underlying physics triggering core collapse supernovae is not fully understood but observations of material ejected during such events helps to solve this puzzle. In particular, several satellite based γ -ray observations of the isotope 44Ti have been reported recently. Conveniently, the amount of this
isotope in stellar ejecta is thought to depend critically on the explosion mechanism. The most influential reaction to the amount of 44Ti in supernovae is 44Ti(α, p)47V. Here we report on a direct study of this reaction conducted at the REX-ISOLDE facility, CERN. The experiment was performed with a 44Ti beam at Elab = 2.16 MeV/u, corresponding to an energy distribution, for reacting α-particles, centred on Ecm = 4.15 with a 1σ width of 0.23 MeV. This is, for the first time, well within the Gamow window for core collapse supernovae. The material from which the 44Ti beam was extracted originates from highly
irradiated components of the SINQ spallation neutron source of the Paul Scherrer Institute. No yield above background was observed, enabling an upper limit for the rate of this reaction to be determined. This result is below expectation, suggesting that the 44Ti(α, p)47V reaction proceeds more slowly than
previously thought. Implications for astrophysical events, and remnant age, are discussed.

Original language	English
Pages (from-to)	358-361
Number of pages	4
Journal	Physics Letters B
Volume	731
Early online date	12 Mar 2014
DOIs	https://doi.org/10.1016/j.physletb.2014.03.003
Publication status	E-pub ahead of print - 12 Mar 2014

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Edinburgh Nuclear Physics Group Consolidated Grant Proposal
Woods, P. (Principal Investigator), Aliotta, M. (Co-investigator), Murphy, A. (Co-investigator) & Watts, D. (Co-investigator)
STFC
1/08/14 → 30/09/18
Project: Research

Alex Murphy
- amurphyph.ed.acuk
- School of Physics and Astronomy - Personal Chair in Nuclear & Particle Astrophysics
Person: Academic: Research Active

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Margerin, V., Murphy, A., Davinson, T., Dressler, R., Fallis, J., Kankainen, A., Laird, A. M., Lotay, G., Mountford, D. J., Murphy, C. D., Seiffert, C., Schumann, D., Stowasser, T., Stora, T., Wang, CH.-T., & Woods, P. J. (2014). Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae. Physics Letters B, 731, 358-361. Advance online publication. https://doi.org/10.1016/j.physletb.2014.03.003

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title = "Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae",

abstract = "The underlying physics triggering core collapse supernovae is not fully understood but observations of material ejected during such events helps to solve this puzzle. In particular, several satellite based γ -ray observations of the isotope 44Ti have been reported recently. Conveniently, the amount of thisisotope in stellar ejecta is thought to depend critically on the explosion mechanism. The most influential reaction to the amount of 44Ti in supernovae is 44Ti(α, p)47V. Here we report on a direct study of this reaction conducted at the REX-ISOLDE facility, CERN. The experiment was performed with a 44Ti beam at Elab = 2.16 MeV/u, corresponding to an energy distribution, for reacting α-particles, centred on Ecm = 4.15 with a 1σ width of 0.23 MeV. This is, for the first time, well within the Gamow window for core collapse supernovae. The material from which the 44Ti beam was extracted originates from highlyirradiated components of the SINQ spallation neutron source of the Paul Scherrer Institute. No yield above background was observed, enabling an upper limit for the rate of this reaction to be determined. This result is below expectation, suggesting that the 44Ti(α, p)47V reaction proceeds more slowly thanpreviously thought. Implications for astrophysical events, and remnant age, are discussed.",

author = "V. Margerin and A. Murphy and T. Davinson and R. Dressler and J. Fallis and A. Kankainen and A.M. Laird and G. Lotay and D.J. Mountford and C.D. Murphy and C. Seiffert and D. Schumann and T. Stowasser and T. Stora and C.H.-T. Wang and P.J. Woods",

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doi = "10.1016/j.physletb.2014.03.003",

language = "English",

volume = "731",

pages = "358--361",

journal = "Physics Letters B",

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Margerin, V, Murphy, A , Davinson, T, Dressler, R, Fallis, J, Kankainen, A, Laird, AM, Lotay, G, Mountford, DJ, Murphy, CD, Seiffert, C, Schumann, D, Stowasser, T, Stora, T, Wang, CH-T & Woods, PJ 2014, 'Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae', Physics Letters B, vol. 731, pp. 358-361. https://doi.org/10.1016/j.physletb.2014.03.003

TY - JOUR

T1 - Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae

AU - Margerin, V.

AU - Murphy, A.

AU - Davinson, T.

AU - Dressler, R.

AU - Fallis, J.

AU - Kankainen, A.

AU - Laird, A.M.

AU - Lotay, G.

AU - Mountford, D.J.

AU - Murphy, C.D.

AU - Seiffert, C.

AU - Schumann, D.

AU - Stowasser, T.

AU - Stora, T.

AU - Wang, C.H.-T.

AU - Woods, P.J.

PY - 2014/3/12

Y1 - 2014/3/12

N2 - The underlying physics triggering core collapse supernovae is not fully understood but observations of material ejected during such events helps to solve this puzzle. In particular, several satellite based γ -ray observations of the isotope 44Ti have been reported recently. Conveniently, the amount of thisisotope in stellar ejecta is thought to depend critically on the explosion mechanism. The most influential reaction to the amount of 44Ti in supernovae is 44Ti(α, p)47V. Here we report on a direct study of this reaction conducted at the REX-ISOLDE facility, CERN. The experiment was performed with a 44Ti beam at Elab = 2.16 MeV/u, corresponding to an energy distribution, for reacting α-particles, centred on Ecm = 4.15 with a 1σ width of 0.23 MeV. This is, for the first time, well within the Gamow window for core collapse supernovae. The material from which the 44Ti beam was extracted originates from highlyirradiated components of the SINQ spallation neutron source of the Paul Scherrer Institute. No yield above background was observed, enabling an upper limit for the rate of this reaction to be determined. This result is below expectation, suggesting that the 44Ti(α, p)47V reaction proceeds more slowly thanpreviously thought. Implications for astrophysical events, and remnant age, are discussed.

AB - The underlying physics triggering core collapse supernovae is not fully understood but observations of material ejected during such events helps to solve this puzzle. In particular, several satellite based γ -ray observations of the isotope 44Ti have been reported recently. Conveniently, the amount of thisisotope in stellar ejecta is thought to depend critically on the explosion mechanism. The most influential reaction to the amount of 44Ti in supernovae is 44Ti(α, p)47V. Here we report on a direct study of this reaction conducted at the REX-ISOLDE facility, CERN. The experiment was performed with a 44Ti beam at Elab = 2.16 MeV/u, corresponding to an energy distribution, for reacting α-particles, centred on Ecm = 4.15 with a 1σ width of 0.23 MeV. This is, for the first time, well within the Gamow window for core collapse supernovae. The material from which the 44Ti beam was extracted originates from highlyirradiated components of the SINQ spallation neutron source of the Paul Scherrer Institute. No yield above background was observed, enabling an upper limit for the rate of this reaction to be determined. This result is below expectation, suggesting that the 44Ti(α, p)47V reaction proceeds more slowly thanpreviously thought. Implications for astrophysical events, and remnant age, are discussed.

U2 - 10.1016/j.physletb.2014.03.003

DO - 10.1016/j.physletb.2014.03.003

M3 - Article

AN - SCOPUS:84896911522

SN - 0370-2693

VL - 731

SP - 358

EP - 361

JO - Physics Letters B

JF - Physics Letters B

ER -

Study of the 44Ti(α, p)47V reaction and implications for core collapse supernovae

Abstract

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Alex Murphy

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