Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei

S. Ahn; D. W. Bardayan; K. L. Jones; A. S. Adekola; G. Arbanas; J. C. Blackmon; K. Y. Chae; K. A. Chipps; J. A. Cizewski; S. Hardy; M. E. Howard; R. L. Kozub; B. Manning; M. Matoš; C. D. Nesaraja; P. D. O'Malley; S. D. Pain; W. A. Peters; S. T. Pittman; B. C. Rasco; M. S. Smith; I. Spassova

doi:10.1103/PhysRevC.100.044613

Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei

S. Ahn, D. W. Bardayan, K. L. Jones, A. S. Adekola, G. Arbanas, J. C. Blackmon, K. Y. Chae, K. A. Chipps, J. A. Cizewski, S. Hardy, M. E. Howard, R. L. Kozub, B. Manning, M. Matoš, C. D. Nesaraja, P. D. O'Malley, S. D. Pain, W. A. Peters, S. T. Pittman, B. C. RascoM. S. Smith, I. Spassova

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Abstract

Results are presented from the first neutron-transfer measurement on Ge80 using an exotic beam from the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Newly measured spins and spectroscopic factors of low-lying states of Ge81 are determined, and the neutron capture cross section on Ge80 was calculated in a direct-semidirect model to provide a more realistic (n,γ) reaction rate for r-process simulations. Furthermore, a region of shape coexistence around N≈50 is confirmed and implications for the magic nature of Ni78 are discussed.

Original language	English
Article number	044613
Journal	Physical Review C
Volume	100
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.100.044613
State	Published - Oct 23 2019

Funding

The authors are grateful to J. M. Allmond, J. L. Wood, and R. K. Grzywacz for very useful discussions. This work is supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contracts No. DE-FG02-96ER40983 (UT), No. DE-SC0001174(UT), No. DE-FG02-96ER40955 (TTU), No. DE-AC05-00OR22725 (ORNL), No. DE-FG02-96ER40978 (LSU), the U.S. Department of Energy, National Nuclear Security Administration Stewardship Science Academic Alliance Program under Contracts No. DE-FG52-08NA28552 and No. DE-NA0002132 (Rutgers), through the US Department of Energy Topical Collaboration TORUS and by the National Science Foundation under grant PHY-1067806 (Rutgers) and grant PHY-1419765 (Notre Dame) and a National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Education, Science, and Technology (MEST) under Grants No. NRF-2014S1A2A2028636, No. NRF-2015R1D1A1A01056918, No. NRF-2016K1A3A7A09005579, and No. NRF-2016R1A5A1013277. This research was conducted at the Oak Ridge National Laboratory Holifield Radioactive Ion Beam Facility, a former D.O.E. Office of Science User Facility.

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Ahn, S., Bardayan, D. W., Jones, K. L., Adekola, A. S., Arbanas, G., Blackmon, J. C., Chae, K. Y., Chipps, K. A., Cizewski, J. A., Hardy, S., Howard, M. E., Kozub, R. L., Manning, B., Matoš, M., Nesaraja, C. D., O'Malley, P. D., Pain, S. D., Peters, W. A., Pittman, S. T., ... Spassova, I. (2019). Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei. Physical Review C, 100(4), Article 044613. https://doi.org/10.1103/PhysRevC.100.044613

@article{34fa2c5fb0c444bf942de6d15bd98c7e,

title = "Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei",

abstract = "Results are presented from the first neutron-transfer measurement on Ge80 using an exotic beam from the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Newly measured spins and spectroscopic factors of low-lying states of Ge81 are determined, and the neutron capture cross section on Ge80 was calculated in a direct-semidirect model to provide a more realistic (n,γ) reaction rate for r-process simulations. Furthermore, a region of shape coexistence around N≈50 is confirmed and implications for the magic nature of Ni78 are discussed.",

author = "S. Ahn and Bardayan, {D. W.} and Jones, {K. L.} and Adekola, {A. S.} and G. Arbanas and Blackmon, {J. C.} and Chae, {K. Y.} and Chipps, {K. A.} and Cizewski, {J. A.} and S. Hardy and Howard, {M. E.} and Kozub, {R. L.} and B. Manning and M. Mato{\v s} and Nesaraja, {C. D.} and O'Malley, {P. D.} and Pain, {S. D.} and Peters, {W. A.} and Pittman, {S. T.} and Rasco, {B. C.} and Smith, {M. S.} and I. Spassova",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = oct,

day = "23",

doi = "10.1103/PhysRevC.100.044613",

language = "English",

volume = "100",

journal = "Physical Review C",

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Ahn, S, Bardayan, DW, Jones, KL, Adekola, AS, Arbanas, G, Blackmon, JC, Chae, KY, Chipps, KA, Cizewski, JA, Hardy, S, Howard, ME, Kozub, RL, Manning, B, Matoš, M, Nesaraja, CD, O'Malley, PD, Pain, SD, Peters, WA, Pittman, ST, Rasco, BC, Smith, MS & Spassova, I 2019, 'Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei', Physical Review C, vol. 100, no. 4, 044613. https://doi.org/10.1103/PhysRevC.100.044613

TY - JOUR

T1 - Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei

AU - Ahn, S.

AU - Bardayan, D. W.

AU - Jones, K. L.

AU - Adekola, A. S.

AU - Arbanas, G.

AU - Blackmon, J. C.

AU - Chae, K. Y.

AU - Chipps, K. A.

AU - Cizewski, J. A.

AU - Hardy, S.

AU - Howard, M. E.

AU - Kozub, R. L.

AU - Manning, B.

AU - Matoš, M.

AU - Nesaraja, C. D.

AU - O'Malley, P. D.

AU - Pain, S. D.

AU - Peters, W. A.

AU - Pittman, S. T.

AU - Rasco, B. C.

AU - Smith, M. S.

AU - Spassova, I.

PY - 2019/10/23

Y1 - 2019/10/23

N2 - Results are presented from the first neutron-transfer measurement on Ge80 using an exotic beam from the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Newly measured spins and spectroscopic factors of low-lying states of Ge81 are determined, and the neutron capture cross section on Ge80 was calculated in a direct-semidirect model to provide a more realistic (n,γ) reaction rate for r-process simulations. Furthermore, a region of shape coexistence around N≈50 is confirmed and implications for the magic nature of Ni78 are discussed.

AB - Results are presented from the first neutron-transfer measurement on Ge80 using an exotic beam from the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Newly measured spins and spectroscopic factors of low-lying states of Ge81 are determined, and the neutron capture cross section on Ge80 was calculated in a direct-semidirect model to provide a more realistic (n,γ) reaction rate for r-process simulations. Furthermore, a region of shape coexistence around N≈50 is confirmed and implications for the magic nature of Ni78 are discussed.

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DO - 10.1103/PhysRevC.100.044613

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VL - 100

JO - Physical Review C

JF - Physical Review C

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M1 - 044613

ER -

Direct neutron capture cross section on Ge 80 and probing shape coexistence in neutron-rich nuclei

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