In-beam γ-ray spectroscopy at the proton dripline: 40Sc
In-beam γ-ray spectroscopy at the proton dripline: 40Sc
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质子滴管处的束内 γ 射线光谱:40Sc
DOI:
10.1016/j.physletb.2020.135637
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发表时间:
2020
影响因子:
4.4
通讯作者:
Li, J.
中科院分区:
文献类型:
--
作者:
Gade, A.;Weisshaar, D.;Brown, B.A.;Tostevin, J.A.;Bazin, D.;Brown, K.;Charity, R.J.;Farris, P.J.;Hill, A.M.;Li, J.
We report on the first in-beam γ-ray spectroscopy of the proton-dripline nucleus 40 Sc using two-nucleon pickup onto an intermediate-energy rare-isotope beam of 38 Ca. The 9 Be (38 Ca, 40 Sc+γ) X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in 40 Sc for which the transferred proton and neutron couple to high orbital angular momentum. In turn, due to angular-momentum selection rules in proton emission and the nuclear structure and energetics of 39 Ca, such states in 40 Sc then exhibit γ-decay branches although they are well above the proton separation energy. This work uniquely complements results from particle spectroscopy following charge-exchange reactions on 40 Ca as well as 40 Ti EC/β+ decay which both display very different selectivities. The population and γ-ray decay of the previously known first (5−) state at 892 keV and the observation of a new level at 2744 keV are discussed in comparison to the mirror nucleus and shell-model calculations. On the experimental side, this work shows that high-resolution in-beam γ-ray spectroscopy is possible with new generation Ge arrays for reactions induced by rare-isotope beams on the level of a few μb of cross section.
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DOI:
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发表时间:
1988
期刊:
影响因子:
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作者:
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1994
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1984
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2014
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发表时间:
1986
期刊:
Physical review. C, Nuclear physics
影响因子:
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