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CERN Document Server 找到 5 笔记录  检索需时 1.32 秒. 
1.
New results on the $^8$Be anomaly / Krasznahorkay, A J (Debrecen, Inst. Nucl. Res.) ; Csatlós, M (Debrecen, Inst. Nucl. Res.) ; Csige, L (Debrecen, Inst. Nucl. Res.) ; Gácsi, Z (Debrecen, Inst. Nucl. Res.) ; Gulyás, J (Debrecen, Inst. Nucl. Res.) ; Nagy, Á (Debrecen, Inst. Nucl. Res.) ; Sas, N (Debrecen, Inst. Nucl. Res.) ; Timár, J (Debrecen, Inst. Nucl. Res.) ; Tornyi, T G (Debrecen, Inst. Nucl. Res.) ; Vajda, I (Debrecen, Inst. Nucl. Res.) et al.
Recently, we observed anomalous internal pair creation for the M1 transition depopulating the 18.15 MeV isoscalar 1$^+$ state in $^8$Be. We observed a significant (σ = 7.37) peak-like deviation from the predicted angular correlation of the e+ e pairs at θ = 140°. [...]
2018 - 7 p. - Published in : J. Phys.: Conf. Ser. 1056 (2018) 012028 Fulltext: pdf - PDF; 10.1088_1742-6596_1056_1_012028 - PDF;
In : Conference on Neutrino and Nuclear Physics, Catania, Italy, 15 - 21 Oct 2017
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2.
Observation of Anomalous Internal Pair Creation in $^8$Be / Krasznahorkay, A J (KLTE-ATOMKI) ; Csatlós, M (KLTE-ATOMKI) ; Csige, L (KLTE-ATOMKI) ; Gácsi, Z (KLTE-ATOMKI) ; Gulyás, J (KLTE-ATOMKI) ; Hunyadi, M (KLTE-ATOMKI) ; Ketel, T J (NIKHEF, Amsterdam) ; Krasznahorkay, A (KLTE-ATOMKI ; CERN) ; Kuti, I (KLTE-ATOMKI) ; Nyakó, B M (KLTE-ATOMKI) et al.
The electron–positron angular correlation was measured for the isoscalar magnetic dipole 18.15 MeV transition in 8Be. Significant, peak-like deviation was observed from the internal pair creation at Θ ≈ 140° in the angular correlation. [...]
2015 - 8 p. - Published in : Acta Phys. Pol. Suppl. 8 (2015) 597 Acta Physica Polonica: PDF;
In : 22nd Nuclear Physics Workshop 'Marie & Pierre Curie': Essential Problems in Nuclear Physics, Kazimierz Dolny, Poland, 22 - 27 Sep 2015, pp.597
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3.
The structure of low-lying states in ${}^{140}$Sm studied by Coulomb excitation / Klintefjord, M. (Oslo U.) ; Hadyńska-Klȩk, K. (INFN, Legnaro ; Oslo U.) ; Görgen, A. (Oslo U.) ; Bauer, C. (Darmstadt, Tech. Hochsch.) ; Bello Garrote, F.L. (Oslo U.) ; Bönig, S. (Darmstadt, Tech. Hochsch.) ; Bounthong, B. (Strasbourg, IPHC) ; Damyanova, A. (Geneva U.) ; Delaroche, J.P. (CEA DAM) ; Fedosseev, V. (CERN) et al.
The electromagnetic structure of $^{140}$Sm was studied in a low-energy Coulomb excitation experiment with a radioactive ion beam from the REX-ISOLDE facility at CERN. The $2^+$ and $4^+$ states of the ground-state band and a second $2^+$ state were populated by multi-step excitation. [...]
arXiv:1603.01525.- 2016-05-02 - 14 p. - Published in : Phys. Rev. C 93 (2016) 054303 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
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4.
Observation of Anomalous Internal Pair Creation in $^8$Be: A Possible Signature of a Light, Neutral Boson / Krasznahorkay, A. J. (Debrecen, Inst. Nucl. Res.) ; Csatlós, M. (KLTE-ATOMKI) ; Csige, L. (KLTE-ATOMKI) ; Gácsi, Z. (KLTE-ATOMKI) ; Gulyás, J. (KLTE-ATOMKI) ; Hunyadi, M. (KLTE-ATOMKI) ; Ketel, T.J. (NIKHEF, Amsterdam) ; Krasznahorkay, A. (KLTE-ATOMKI ; CERN) ; Kuti, I. (KLTE-ATOMKI) ; Nyakó, B.M. (KLTE-ATOMKI) et al.
Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV state ($J^\pi=1^+$, $T=1$) $\rightarrow$ ground state ($J^\pi=0^+$, $T=0$) and the isoscalar magnetic dipole 18.15 MeV ($J^\pi=1^+$, $T=0$) state $\rightarrow$ ground state transitions in $^{8}$Be. Significant deviation from the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of $> 5\sigma$. [...]
arXiv:1504.01527.- 2016-01-26 - 5 p. - Published in : Phys. Rev. Lett. 116 (2016) 042501 APS Open Access article: PDF; Fulltext: PDF; External link: Symmetry Magazine article
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5.
A pair spectrometer for measuring multipolarities of energetic nuclear transitions / Gulyás, J. (Debrecen, Inst. Nucl. Res.) ; Ketel, T.J. (NIKHEF, Amsterdam) ; Krasznahorkay, A.J. (Debrecen, Inst. Nucl. Res.) ; Csatlós, M. (Debrecen, Inst. Nucl. Res.) ; Csige, L. (Debrecen, Inst. Nucl. Res.) ; Gácsi, Z. (Debrecen, Inst. Nucl. Res.) ; Hunyadi, M. (Debrecen, Inst. Nucl. Res.) ; Krasznahorkay, A. (CERN) ; Vitéz, A. (Debrecen, Inst. Nucl. Res.) ; Tornyi, T.G. (Debrecen, Inst. Nucl. Res.)
A multi-detector array has been designed and constructed for the simultaneous measurement of energy- and angular correlations of electron-positron pairs. Experimental results are obtained over a wide angular range for high-energy transitions in 16O, 12C and 8Be. [...]
arXiv:1504.00489.- 2016-02-01 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 808 (2016) 21-28 Fulltext: PDF; External link: Preprint
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