First Measurement of the Neutron-Emission Probability with a Surrogate Reaction in Inverse Kinematics at a Heavy-Ion Storage Ring

Sguazzin, M.; Jurado, B.; Pibernat, J.; Swartz, J.A.; Grieser, M.; Glorius, J.; Litvinov, Yu.A.; Adamczewski-Musch, J.; Alfaurt, P.; Ascher, P.

doi:10.1103/PhysRevLett.134.072501

First Measurement of the Neutron-Emission Probability with a Surrogate Reaction in Inverse Kinematics at a Heavy-Ion Storage Ring

M. Sguazzin
(
- LP2I, Bordeaux
)
,
B. Jurado
(
- LP2I, Bordeaux
)
,
J. Pibernat
(
- LP2I, Bordeaux
)
,
J.A. Swartz
(
- LP2I, Bordeaux
)
,
M. Grieser
(
- Heidelberg, Max Planck Inst.
)

Dec 21, 2023

10 pages

Published in:

Phys.Rev.Lett. 134 (2025) 7, 072501

Published: Feb 18, 2025

e-Print:

2312.13742 [nucl-ex]

DOI:

10.1103/PhysRevLett.134.072501 (publication)

View in:

pdf

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Abstract: (APS)

Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the radioactivity of the targets involved. One way of overcoming this issue is to combine surrogate reactions with the unique possibilities offered by heavy-ion storage rings. In this work, we describe the first surrogate-reaction experiment in inverse kinematics, which we successfully conducted at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, using the

{}^{208}{Pb} (p, p^{'})

reaction as a surrogate for neutron capture on

{}^{207}{Pb}

. Thanks to the outstanding detection efficiencies possible at the ESR, we were able to measure for the first time the neutron-emission probability as a function of the excitation energy of

{}^{208}{Pb}

. We have used this probability to select different descriptions of the

γ

-ray strength function and nuclear level density, and provide reliable results for the neutron-induced radiative capture cross section of

{}^{207}{Pb}

at energies for which no experimental data exist.

Note:

10 pages and 5 figures

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See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevLett.134.072501 for more details on the calculations of the spin-parity distributions, on the γ-ray strength functions and level densities used, and on the comparison of the calculations and the experimental data, which includes Refs. [26–38]

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