Enhanced low-energy 
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 strength of 
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 and its robustness within the shell model

Larsen, A. C.; Midtbø, J. E.; Guttormsen, M.; Renstrøm, T.; Liddick, S. N.; Spyrou, A.; Karampagia, S.; Brown, B. A.; Achakovskiy, O. I.; Kamerdzhiev, S. P.; Bleuel, D. L.; Couture, A.; Campo, L. Crespo; Crider, B. P.; Dombos, A. C.; Lewis, R.; Mosby, S.; Naqvi, F.; Perdikakis, G.; Prokop, C. J.; Quinn, S. J.; Siem, S.

doi:10.1103/physrevc.97.054329

Cited by 35 publications

(39 citation statements)

References 78 publications

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“…The shell-model calculations clearly support an assertion of M 1 character for the low-energy upbend, in accordance with other recent shell-model work [89][90][91][92][93]. In the case of 56,57 Fe, there is experimental evidence that the upbend is dominated by dipole transitions [46,94].…”

Section: Resultssupporting

confidence: 90%

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Liddick¹,

Larsen²,

Guttormsen³

et al. 2019

Phys. Rev. C

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Numerous scientific fields including astrophysics, nuclear power, and nuclear forensics require a knowledge of basic nuclear properties for large numbers of short-lived, radioactive isotopes far removed from stable nuclei. Neutron-capture cross sections are one such piece of nuclear data where direct measurements are not possible and theoretical predictions can vary by orders of magnitude. A recently developed indirect technique for inferring neutron capture rates, the β-Oslo method, has been introduced but not compared against a known, directly measured neutron capture cross section. To provide this benchmark, two indirect methods based on β decay and charged-particle reactions were used to extract the nuclear level density and γ-ray strength function of 51 Ti. The nuclear level density and γ-ray strength function from the two data sets were found to be equivalent and were used to extract the neutron capture cross section of 50 Ti which agrees with previous direct measurements at high neutron energies. The results demonstrate the validity of the β-Oslo method for extracting neutron capture cross sections of short-lived nuclei and provide a sufficiently small uncertainty to be used in various applications.

show abstract

Section: Resultssupporting

confidence: 90%

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Liddick¹,

Larsen²,

Guttormsen³

et al. 2019

Phys. Rev. C

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“…The experimental and theoretical studies of multipole pygmy-and giant resonances, especially pygmy-dipole resonance (for simplicity, hereinafter PDR and GMR), continue to draw much attention, see reviews [1][2][3][4][5]. For PDR , it is explained by the new experimental possibilities [3,6,7], for example, polarized proton inelastic scattering at very forward angles [6], the existence of many new and delicate physical effects in this energy region, like irrotational and vortical kind of motion [2,8] and the upbend phenomenon for the photon strength function in the energy region of 1-3 MeV [7]. Besides, as it turned out, it is impossible to explain completely, with the account of phonon coupling (PC), the observed PDR fine structure, even in the nucleus 208 Pb, within both nonself-consistent [9] and self-consistent [10] approaches.…”

Section: Introductionmentioning

confidence: 99%

Microscopic theory of pygmy- and giant resonances: accounting for complex 1p1h$$\otimes $$phonon configurations

Kamerdzhiev

Shitov

2020

Eur. Phys. J. A

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The self-consistent Theory of Finite Fermi Systems (TFFS) is consistently generalized for the case of accounting for phonon coupling (PC) effects in the energy region of pygmy-and giant multipole resonances (PDR and GMR) in magic nuclei with the aim to consider particle-hole (ph) and both complex 1p1h⊗phonon and two-phonon configurations. The article is the direct continuation and generalization of the previous article [S.Kamerdzhiev, M.Shitov, Eur.Phys.J.A. 56, 265 (2020)], referred to as [I], where 1p1h-and only complex 1p1h⊗phonon configurations were considered. The newest equation for the TFFS main quantity, the effective field (vertex), which describes the nuclear polarizability, has been obtained. It has considerably generalized the results of the previous article and accounts for two-phonon configurations. Two variants of the newest vertex equation have been derived: (1)the first variant contains complex 1p1h⊗phonon configurations and the full 1p1h-interaction amplitude Γ instead of the known effective interaction F in [I], (2) the second one contains both 1p1h⊗phonon and two-phonon configurations. Both variants contain new, as compared to usual approaches, PC contributions, which are of interest in the energy region under consideration and, at least, should result in a redistribution of the PDR and GMR strength, which is important for the explanation of the PDR and GMR fine structure. The qualitative analysis and discussion of the new terms and the comparison to the known time-blocking approximation are performed.

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“…In 70 Co, the ground state has been predicted to be the shorter-living high-spin state with spin and parity (6 − , 7 − ) and T 1/2 = 112(7) ms, studied in many fragmentation experiments [33,[47][48][49]. Recently, a β-decay study of 70 Fe [50] and Monte Carlo shell-model calculations based on the A3DA Hamiltonian [51] suggest the ground state of 70 Co to be a (1 + , 2 + ) state with T 1/2 = 508(7) ms.…”

mentioning

confidence: 99%

Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward
Cañete
¹
,
Giraud
²
,
Kankainen
³

et al. 2020
Phys. Rev. C

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Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

Cited by 35 publications

References 78 publications

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Microscopic theory of pygmy- and giant resonances: accounting for complex 1p1h$$\otimes $$phonon configurations

Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward
Cañete
¹
,
Giraud
²
,
Kankainen
³

et al. 2020
Phys. Rev. C

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Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

Cited by 35 publications

References 78 publications

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Microscopic theory of pygmy- and giant resonances: accounting for complex 1p1h$$\otimes $$phonon configurations

Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward Cañete1, Giraud2, Kankainen3 et al. 2020Phys. Rev. C

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About

Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward
Cañete
¹
,
Giraud
²
,
Kankainen
³

et al. 2020
Phys. Rev. C