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-process nucleosynthesisBhattacharyya, A.*; Datta, U.*; Rahaman, A.*; Chakraborty, S.*; Aumann, T.*; Beceiro-Novo, S.*; Boretzky, K.*; Caesar, C.*; Carlson, B. V.*; Catford, W. N.*; et al.
Physical Review C, 104(4), p.045801_1 - 045801_14, 2021/10
被引用回数：5 パーセンタイル：57.13(Physics, Nuclear)中性子過剰核に対する中性子捕獲断面積は、過程元素合成を理解する上で直接必要なデータであるものの、中性子標的が存在しないことと中性子過剰核の半減期が短いため、その実験を行うことは困難である。その代替手段として、
反応の逆過程である
反応のデータから導出する方法が行われている。本論文では、中性子数20領域の中性子過剰核に対し、クーロン分解反応を用いて反応の断面積を測定し、そこから反応の断面積を得た。その結果、
Naと
Alに対する中性子捕獲断面積については、統計模型で予測された値よりも小さく、
Mgに対しては大きな値となることがわかった。
decays of 
At and expansion of the Po level schemeBrunet, M.*; Podoly
k, Zs.*; Berry, T. A.*; Brown, B. A.*; Carroll, R. J.*; Lica, R.*; Sotty, Ch.*; Andreyev, A. N.; Borge, M. J. G.*; Cubiss, J. G.*; et al.
Physical Review C, 103(5), p.054327_1 - 054327_13, 2021/05
被引用回数：4 パーセンタイル：57.13(Physics, Nuclear)The structure of Po populated through the EC/
decay of At is investigated using 
-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed rays which have been (re)assigned a position. Through the analysis using the shell model calculations approximately half of the -decay strength of At is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations.
= 0 selection rule in Gamow-Teller transitions; The -decay of 
HgBerry, T. A.*; Podolyk, Zs.*; Carroll, R. J.*; Lic
, R.*; Grawe, H.*; Timofeyuk, N. K.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; et al.
Physics Letters B, 793, p.271 - 275, 2019/06
被引用回数：5 パーセンタイル：47.88(Astronomy & Astrophysics)Gamow-Teller decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This = 0 requirement plays a major role in the decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical -process pathway below both 
= 50 (for 
82) and = 82 (for 126). The level of forbiddenness of the = 1 
1
0
transition has been investigated from the 
decay of the ground state of Hg into the single-proton-hole nucleus Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible -ray transitions depopulating the 
0
state in Tl, an upper limit of 3.9
10
% was obtained for the probability of this decay, corresponding to log
8.8 within a 95% confidence limit. This is the most stringent test of the = 0 selection rule to date.
MgLund, M. V.*; Andreyev, A. N.; Borge, M. J. G.*; Cederk
ll, J.*; De Witte, H.*; Fraile, L. M.*; Fynbo, H. O. U.*; Greenlees, P. T.*; Harkness-Brennan, L. J.*; Howard, A. M.*; et al.
European Physical Journal A, 52(10), p.304_1 - 304_14, 2016/10
被引用回数：17 パーセンタイル：75.78(Physics, Nuclear)Beta-delayed proton emission from Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station setup including both charged-particle and -ray detection capabilities. A total of 27 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State in Na is observed. This may allow studies of the 4032.9(2.4) keV resonance in 
Ne through the beta decay of Mg, which is important for the astrophysically relevant reaction 
O(
,)Ne. Beta-delayed protons were used to obtain a more precise value for the half-life of Mg, 91.4(1.0) ms.
-forbidden 1/2
3/2 
transition in 
SnLic, R.*; Mach, H.*; Fraile, L. M.*; Gargano, A.*; Borge, M. J. G.*; Mrginean, N.*; Sotty, C. O.*; Vedia, V.*; Andreyev, A. N.; Benzoni, G.*; et al.
Physical Review C, 93(4), p.044303_1 - 044303_7, 2016/04
被引用回数：5 パーセンタイル：39.53(Physics, Nuclear)The levels in Sn populated from the 
decay of In isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station. The lowest 1/2 state and the 3/2 ground state in Sn are expected to have configurations dominated by the neutron 
(=0) and 
(=2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow -forbidden transition. Using fast-timing spectroscopy we have measured the half-life of the 1/2 315.3-keV state, 
= 19(10) ps, which corresponds to a moderately fast transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and 
factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured value by the renormalization of the effective operator for neutron holes.
