The Brink-Axel hypothesis and the γ-ray strength function between excited states of 128Te

Söderström, P.-A.; KUŞOĞLU, Aslı; Balabanski, D.L.; Ban, S.-R.; Corbu, R.; Cuciuc, M.; Petruse, T.; Spataru, A.; Aogaki, S.; Borcea, R.; Brezeanu, M.; Calinescu, S.; Costache, C.; Dhal, A.; Dinescu, I.; Florea, N.M.; Furuno, T.; Gavrilescu, A.; Gupta, A.; Honda, Y.; Jerca, N.C.; Kawabata, T.; Lelasseux, V.; Lica, R.; Marin, C.; Mihai, C.; Niculae, S.; Pai, H.; Pârlea, I.P.; Testov, D.A.; Tofan, D.; Tozar, T.; Turturică, A.; Turturică, G.; Ujeniuc, S.

doi:10.1016/j.physletb.2026.140942

The Brink-Axel hypothesis and the γ-ray strength function between excited states of 128Te

Söderström P., KUŞOĞLU A., Balabanski D., Ban S., Corbu R., Cuciuc M., ...Daha Fazla

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.881, 2026 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 881
Basım Tarihi: 2026
Doi Numarası: 10.1016/j.physletb.2026.140942
Dergi Adı: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, MathSciNet, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
Anahtar Kelimeler: Brink-Axel hypothesis, Nuclear level density, Porter-Thomas fluctuations, γ-ray strength function
İstanbul Üniversitesi Adresli: Evet

Özet

Here we report on the measurement of the γ -ray strength function of 128Te in an inelastic proton scattering experiment. This strength function data were evaluated by three different independent methods: (γ, γ ′) cross sections, the Oslo Method with neutron resonant capture systematics, and the Shape Method, and we show that all three methods yield consistent results. We test the Brink-Axel hypothesis by investigating this γ -ray strength function as a function of excitation energy of the initial and final states. We observe a reduced χ 2 very close to one between the individual strength functions and the total, implying the existence of a unique γ -ray strength function in (p, p′ γ) reactions. A slight difference in the individual γ -ray strength functions can be partially explained by Porter-Thomas fluctuations, in contrast to the γ -ray strength functions obtained from (γ→,γ′γ″) data that show significantly larger fluctuations. This shows that there is a difference between the photoexcitation reactions and excitation by proton scattering regarding the decay characteristics from the quasi-continuum.