The beta-decay of Kr-70 into Br-70: Restoration of the pseudo-SU(4) symmetry

Vitez-Sveiczer, A.; Algora, A.; Morales, A.; Rubio, B.; Kiss, G.; Sarriguren, P.; Van Isacker, P.; de Angelis, G.; Recchia, F.; Nishimura, S.; Agramunt, J.; Guadilla, V; Montaner-Piza, A.; Orrigo, S.; Horvath, A.; Napoli, D.; Lenzi, S.; Boso, A.; Phong, V.; Wu, J.; Soderstrom, P-A; Sumikama, T.; Suzuki, H.; Takeda, H.; Ahn, D.; Baba, H.; Doornebal, P.; Fukuda, N.; Inabe, N.; Isobe, T.; Kubo, T.; Kubono, S.; Sakurai, H.; Shimizu, Y.; Sidong, C.; Blank, B.; Ascher, P.; Gerbaux, M.; Goigoux, T.; Giovinazzo, J.; Grevy, S.; Nieto, T.; Magron, C.; Gelletly, W.; Dombradi, Zs; Fujita, Y.; Tanaka, M.; Aguilera, P.; Molina, F.; Eberth, J.; Diel, F.; Lubos, D.; Borcea, C.; Ganioglu, Ela; Nishimura, D.; Oikawa, H.; Takei, Y.; Yagi, S.; Korten, W.; de France, G.; Davies, P.; Liu, J.; Lee, J.; Lokotko, T.; Kojouharov, I; Kurz, N.; Shaffner, H.; Petrovici, A.

doi:10.1016/j.physletb.2022.137123

The beta-decay of Kr-70 into Br-70: Restoration of the pseudo-SU(4) symmetry

Atıf İçin Kopyala

Vitez-Sveiczer A., Algora A., Morales A., Rubio B., Kiss G. G., Sarriguren P., ...Daha Fazla

PHYSICS LETTERS B, cilt.830, 2022 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 830
Basım Tarihi: 2022
Doi Numarası: 10.1016/j.physletb.2022.137123
Dergi Adı: PHYSICS LETTERS B
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, zbMATH, Directory of Open Access Journals
Anahtar Kelimeler: Beta decay of Kr-70, pn pairing, GT strength distribution, Pseudo-SU(4) symmetry, QRPA calculations, RP-PROCESS, NUCLEOSYNTHESIS, IDENTIFICATION, EXCITATION, NUCLEI, STATES, SPIN
İstanbul Üniversitesi Adresli: Evet

Özet

The beta-decay of the even-even nucleus Kr-70 with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen gamma-rays associated with the beta-decay of( 70)Kr into Br-70 have been identified for the first time, defining ten populated states below E-exc=3300 keV. The half-life of Kr-70 was derived with increased precision and found to be t(1/2)=45.19 +/- 0.14 ms. The beta-delayed proton emission probability has also been determined as epsilon(p)=0.545(23)%. An increase in the beta-strength to the yrast 1(+) state in comparison with the heaviest Z=N+2 system studied so far (Ge-62 decay) is observed that may indicate increased np correlations in the T=0 channel. The beta-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system. (C) 2022 The Author(s). Published by Elsevier B.V.