<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mo>−</mml:mo><mml:mi>n</mml:mi></mml:mrow></mml:math>decay of the neutron-rich<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ge</mml:mi><mml:mprescripts /><mml:none /><mml:mn>84</mml:mn></mml:mmultiscripts></mml:math>nucleus

We report on the β-delayed neutron emission probability (P 1n) measurements of the 82,83,84 Ga (N = 51,52,53) precursors performed in one single experiment using the 3 He neutron-counter TETRA at the ALTO facility in Orsay. Altogether our results for the three A = 82,83, and 84 Ga precursors point towards a sizable P 1n staggering in the N = 50 region, similar to the one already observed just after the N = 28 shell closure in the K isotopes chain, hinting at a similar mechanism. We will discuss the possible microscopic origin of this behavior, i.e., the existence in the light N = 51 isotones of low-lying components of the so called pygmy Gamow-Teller resonance, already well established at Z = 36, and persisting toward 79 Ni.

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“…This confirms the assignment of the 307-keV γ ray to the βn decay of 84 Ge recently reported in Ref. [39].…”

Section: βN-gated γ -Spectroscopysupporting

confidence: 92%

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities

et al. 2017

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Structure of As83, As85, and As
Rezynkina¹,
Dao²,
Duchêne³
et al. 2022
Phys. Rev. C
5
1
2
1
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The structure of 83 As, 85 As and 87 As have been studied in fusion-fission reaction 238 U+ 9 Be. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident γ-rays were detected in the γ-ray tracking array AGATA. New transitions in 83 As and 85 As are reported and placed in the level schemes. A level scheme of the excited states in 87 As is proposed for the first time. The data are interpreted in frame of Large-Scale Shell-Model calculations, SU3 symmetries and Beyond Mean-Field frameworks. A spherical regime at magic number N =50 is predicted and the location of the proton g 9/2 orbital is proposed for the first time. Development of collectivity in a prolate deformed, γ-soft regime in the open shell cases 85 As and 87 As, most neutron-rich isotopes beyond N =50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the 9/2 + state in 79 Cu, one proton above 78 Ni.

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Experimental study of the β decay of the very neutron-rich nucleus Ge85

et al. 2017

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The β-decay properties of the very neutron-rich nucleus 85 Ge, produced in the proton-induced fission of 238 U, were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The level scheme of 85 33 As52 populated in 85 Ge βγ decay was reconstructed and compared to shell model calculations. The investigation of the systematics of low-energy levels in N=52 isotones together with shell-model analysis, allowed us to provide an estimate of the low-energy structure of the more exotic N=52 isotone 81 Cu.

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βandβ−ndecay of the neutron-richGe84nucleus

Cited by 3 publications

References 35 publications

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities

Structure of As83, As85, and As
Rezynkina¹,
Dao²,
Duchêne³
et al. 2022
Phys. Rev. C
5
1
2
1
View full text Add to dashboard Cite

Experimental study of the β decay of the very neutron-rich nucleus Ge85

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βandβ−ndecay of the neutron-richGe84nucleus

Cited by 3 publications

References 35 publications

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities

Structure of As83, As85, and AsRezynkina1, Dao2, Duchêne3 et al. 2022Phys. Rev. C5121View full textAdd to dashboardCite

Experimental study of the β decay of the very neutron-rich nucleus Ge85

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Product

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About

Structure of As83, As85, and As
Rezynkina¹,
Dao²,
Duchêne³
et al. 2022
Phys. Rev. C
5
1
2
1
View full text Add to dashboard Cite