57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass

M. Saxena; W. J Ong; Z. Meisel; D. E.M. Hoff; N. Smirnova; P. C. Bender; S. P. Burcher; M. P. Carpenter; J. J. Carroll; A. Chester; C. J. Chiara; R. Conaway; P. A. Copp; B. P. Crider; J. Derkin; A. Estradé; G. Hamad; J. T. Harke; R. Jain; H. Jayatissa; S. N. Liddick; B. Longfellow; M. Mogannam; F. Montes; N. Nepal; T. H. Ogunbeku; A. L. Richard; H. Schatz; D. Soltesz; S. K. Subedi; I. Sultana; A. S. Tamashiro; V. Tripathi; Y. Xiao; R. Zink

doi:10.1016/j.physletb.2022.137059

⁵⁷Zn β-delayed proton emission establishes the ⁵⁶Ni rp-process waiting point bypass

M. Saxena
, W. J Ong
, Z. Meisel
, D. E.M. Hoff
, N. Smirnova
, P. C. Bender
, S. P. Burcher
, M. P. Carpenter
, J. J. Carroll
, A. Chester
, C. J. Chiara
, R. Conaway
, P. A. Copp
, B. P. Crider
, J. Derkin
, A. Estradé
, G. Hamad
, J. T. Harke
, R. Jain
, H. Jayatissa

S. N. Liddick, B. Longfellow, M. Mogannam, F. Montes, N. Nepal, T. H. Ogunbeku, A. L. Richard, H. Schatz, D. Soltesz, S. K. Subedi, I. Sultana, A. S. Tamashiro, V. Tripathi, Y. Xiao, R. Zink

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

5 Scopus citations

Abstract

We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17% of the rp-process flow taking this route.

Original language	English
Article number	137059
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	829
DOIs	https://doi.org/10.1016/j.physletb.2022.137059
State	Published - 10 Jun 2022
Externally published	Yes

Keywords

Type-1 X-ray bursts
Waiting-point
β-decay measurement of proton rich isotope

Access to Document

10.1016/j.physletb.2022.137059

Cite this

Saxena, M., J Ong, W., Meisel, Z., Hoff, D. E. M., Smirnova, N., Bender, P. C., Burcher, S. P., Carpenter, M. P., Carroll, J. J., Chester, A., Chiara, C. J., Conaway, R., Copp, P. A., Crider, B. P., Derkin, J., Estradé, A., Hamad, G., Harke, J. T., Jain, R., ... Zink, R. (2022). ⁵⁷Zn β-delayed proton emission establishes the ⁵⁶Ni rp-process waiting point bypass. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 829, Article 137059. https://doi.org/10.1016/j.physletb.2022.137059

@article{80022216faaf40e5940ab4c06d701a33,

title = "57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass",

abstract = "We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)\%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17\% of the rp-process flow taking this route.",

keywords = "Type-1 X-ray bursts, Waiting-point, β-decay measurement of proton rich isotope",

author = "M. Saxena and \{J Ong\}, W. and Z. Meisel and Hoff, \{D. E.M.\} and N. Smirnova and Bender, \{P. C.\} and Burcher, \{S. P.\} and Carpenter, \{M. P.\} and Carroll, \{J. J.\} and A. Chester and Chiara, \{C. J.\} and R. Conaway and Copp, \{P. A.\} and Crider, \{B. P.\} and J. Derkin and A. Estrad{\'e} and G. Hamad and Harke, \{J. T.\} and R. Jain and H. Jayatissa and Liddick, \{S. N.\} and B. Longfellow and M. Mogannam and F. Montes and N. Nepal and Ogunbeku, \{T. H.\} and Richard, \{A. L.\} and H. Schatz and D. Soltesz and Subedi, \{S. K.\} and I. Sultana and Tamashiro, \{A. S.\} and V. Tripathi and Y. Xiao and R. Zink",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s)",

year = "2022",

month = jun,

day = "10",

doi = "10.1016/j.physletb.2022.137059",

language = "English",

volume = "829",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Saxena, M, J Ong, W, Meisel, Z, Hoff, DEM, Smirnova, N, Bender, PC, Burcher, SP, Carpenter, MP, Carroll, JJ, Chester, A, Chiara, CJ, Conaway, R, Copp, PA, Crider, BP, Derkin, J, Estradé, A, Hamad, G, Harke, JT, Jain, R, Jayatissa, H, Liddick, SN, Longfellow, B, Mogannam, M, Montes, F, Nepal, N, Ogunbeku, TH, Richard, AL, Schatz, H, Soltesz, D, Subedi, SK, Sultana, I, Tamashiro, AS, Tripathi, V, Xiao, Y & Zink, R 2022, '⁵⁷Zn β-delayed proton emission establishes the ⁵⁶Ni rp-process waiting point bypass', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 829, 137059. https://doi.org/10.1016/j.physletb.2022.137059

TY - JOUR

T1 - 57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass

AU - Saxena, M.

AU - J Ong, W.

AU - Meisel, Z.

AU - Hoff, D. E.M.

AU - Smirnova, N.

AU - Bender, P. C.

AU - Burcher, S. P.

AU - Carpenter, M. P.

AU - Carroll, J. J.

AU - Chester, A.

AU - Chiara, C. J.

AU - Conaway, R.

AU - Copp, P. A.

AU - Crider, B. P.

AU - Derkin, J.

AU - Estradé, A.

AU - Hamad, G.

AU - Harke, J. T.

AU - Jain, R.

AU - Jayatissa, H.

AU - Liddick, S. N.

AU - Longfellow, B.

AU - Mogannam, M.

AU - Montes, F.

AU - Nepal, N.

AU - Ogunbeku, T. H.

AU - Richard, A. L.

AU - Schatz, H.

AU - Soltesz, D.

AU - Subedi, S. K.

AU - Sultana, I.

AU - Tamashiro, A. S.

AU - Tripathi, V.

AU - Xiao, Y.

AU - Zink, R.

PY - 2022/6/10

Y1 - 2022/6/10

N2 - We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17% of the rp-process flow taking this route.

AB - We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17% of the rp-process flow taking this route.

KW - Type-1 X-ray bursts

KW - Waiting-point

KW - β-decay measurement of proton rich isotope

UR - https://www.scopus.com/pages/publications/85127627544

U2 - 10.1016/j.physletb.2022.137059

DO - 10.1016/j.physletb.2022.137059

M3 - Article

AN - SCOPUS:85127627544

SN - 0370-2693

VL - 829

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 137059