Search for the 15Be ground state

A. Spyrou; J. K. Smith; T. Baumann; B. A. Brown; J. Brown; G. Christian; P. A. Deyoung; N. Frank; S. Mosby; W. A. Peters; A. Schiller; M. J. Strongman; M. Thoennessen; J. A. Tostevin

doi:10.1103/PhysRevC.84.044309

Search for the 15Be ground state

A. Spyrou^*, J. K. Smith, T. Baumann, B. A. Brown, J. Brown, G. Christian, P. A. Deyoung, N. Frank, S. Mosby, W. A. Peters, A. Schiller, M. J. Strongman, M. Thoennessen, J. A. Tostevin

^*Corresponding author for this work

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

17 Scopus citations

Abstract

A two-proton knockout reaction from a 17C beam at 55 MeV/u was used to produce the unbound nucleus 15Be. No significant number of events were observed for the decay of 15Be into a neutron and a 14Be fragment. An upper limit for the 14Be production cross section of 0.079±0.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in 15Be decay through three sequential neutron decays into 12Be, via the unbound first excited state of 14Be. Therefore, these states in 15Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2⁺ state in 14Be.

Original language	English (US)
Article number	044309
Journal	Physical Review C - Nuclear Physics
Volume	84
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.84.044309
State	Published - Oct 12 2011
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.84.044309

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title = "Search for the 15Be ground state",

abstract = "A two-proton knockout reaction from a 17C beam at 55 MeV/u was used to produce the unbound nucleus 15Be. No significant number of events were observed for the decay of 15Be into a neutron and a 14Be fragment. An upper limit for the 14Be production cross section of 0.079±0.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in 15Be decay through three sequential neutron decays into 12Be, via the unbound first excited state of 14Be. Therefore, these states in 15Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2+ state in 14Be.",

author = "A. Spyrou and Smith, {J. K.} and T. Baumann and Brown, {B. A.} and J. Brown and G. Christian and Deyoung, {P. A.} and N. Frank and S. Mosby and Peters, {W. A.} and A. Schiller and Strongman, {M. J.} and M. Thoennessen and Tostevin, {J. A.}",

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T1 - Search for the 15Be ground state

AU - Spyrou, A.

AU - Smith, J. K.

AU - Baumann, T.

AU - Brown, B. A.

AU - Brown, J.

AU - Christian, G.

AU - Deyoung, P. A.

AU - Frank, N.

AU - Mosby, S.

AU - Peters, W. A.

AU - Schiller, A.

AU - Strongman, M. J.

AU - Thoennessen, M.

AU - Tostevin, J. A.

PY - 2011/10/12

Y1 - 2011/10/12

N2 - A two-proton knockout reaction from a 17C beam at 55 MeV/u was used to produce the unbound nucleus 15Be. No significant number of events were observed for the decay of 15Be into a neutron and a 14Be fragment. An upper limit for the 14Be production cross section of 0.079±0.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in 15Be decay through three sequential neutron decays into 12Be, via the unbound first excited state of 14Be. Therefore, these states in 15Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2+ state in 14Be.

AB - A two-proton knockout reaction from a 17C beam at 55 MeV/u was used to produce the unbound nucleus 15Be. No significant number of events were observed for the decay of 15Be into a neutron and a 14Be fragment. An upper limit for the 14Be production cross section of 0.079±0.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in 15Be decay through three sequential neutron decays into 12Be, via the unbound first excited state of 14Be. Therefore, these states in 15Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2+ state in 14Be.

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DO - 10.1103/PhysRevC.84.044309

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IS - 4

M1 - 044309

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Search for the 15Be ground state

Abstract

ASJC Scopus subject areas

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