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Article ; Online: Observation of Anomalous Internal Pair Creation in ^{8}Be: A Possible Indication of a Light, Neutral Boson.

Krasznahorkay, A J / Csatlós, M / Csige, L / Gácsi, Z / Gulyás, J / Hunyadi, M / Kuti, I / Nyakó, B M / Stuhl, L / Timár, J / Tornyi, T G / Vajta, Zs / Ketel, T J / Krasznahorkay, A

Physical review letters

2016 Volume 116, Issue 4, Page(s) 42501

Abstract: Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV (J^{π}=1^{+}, T=1) state→ground state (J^{π}=0^{+}, T=0) and the isoscalar magnetic dipole 18.15 MeV (J^{π}=1^{+}, T=0) state→ground state transitions in ^{8} ... ...

Abstract	Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV (J^{π}=1^{+}, T=1) state→ground state (J^{π}=0^{+}, T=0) and the isoscalar magnetic dipole 18.15 MeV (J^{π}=1^{+}, T=0) state→ground state transitions in ^{8}Be. Significant enhancement relative to the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of >5σ. This observation could possibly be due to nuclear reaction interference effects or might indicate that, in an intermediate step, a neutral isoscalar particle with a mass of 16.70±0.35(stat)±0.5(syst) MeV/c^{2} and J^{π}=1^{+} was created.
Language	English
Publishing date	2016-01-29
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.116.042501
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Article ; Online: Experimental Evidence for Transverse Wobbling in ^{105}Pd.

Timár, J / Chen, Q B / Kruzsicz, B / Sohler, D / Kuti, I / Zhang, S Q / Meng, J / Joshi, P / Wadsworth, R / Starosta, K / Algora, A / Bednarczyk, P / Curien, D / Dombrádi, Zs / Duchêne, G / Gizon, A / Gizon, J / Jenkins, D G / Koike, T /

Krasznahorkay, A / Molnár, J / Nyakó, B M / Paul, E S / Rainovski, G / Scheurer, J N / Simons, A J / Vaman, C / Zolnai, L

Physical review letters

2019 Volume 122, Issue 6, Page(s) 62501

Abstract: New rotational bands built on the ν(h_{11/2}) configuration have been identified in ^{105}Pd. Two bands built on this configuration show the characteristics of transverse wobbling: the ΔI=1 transitions between them have a predominant E2 component and the ...

Abstract	New rotational bands built on the ν(h_{11/2}) configuration have been identified in ^{105}Pd. Two bands built on this configuration show the characteristics of transverse wobbling: the ΔI=1 transitions between them have a predominant E2 component and the wobbling energy decreases with increasing spin. The properties of the observed wobbling bands are in good agreement with theoretical results obtained using constrained triaxial covariant density functional theory and quantum particle rotor model calculations. This provides the first experimental evidence for transverse wobbling bands based on a one-neutron configuration, and also represents the first observation of wobbling motion in the A∼100 mass region.
Language	English
Publishing date	2019-03-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.122.062501
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Book ; Online: A neutron spectrometer for studying giant resonances with (p, n) reactions in inverse kinematics

Stuhl, L. / Krasznahorkay, A. / Csatlós, M. / Algora, A. / Gulyás, J. / Kalinka, G. / Timár, J. / Kalantar-Nayestanaki, N. / Rigollet, C. / Bagchi, S. / Najafi, M. A.

2013

Abstract: A neutron spectrometer, the European Low-Energy Neutron Spectrometer (ELENS), has been constructed to study exotic nuclei in inverse-kinematics experiments. The spectrometer, which consists of plastic scintillator bars, can be operated in the neutron ... ...

Abstract	A neutron spectrometer, the European Low-Energy Neutron Spectrometer (ELENS), has been constructed to study exotic nuclei in inverse-kinematics experiments. The spectrometer, which consists of plastic scintillator bars, can be operated in the neutron energy range of 100 keV to 10 MeV. The neutron energy is determined using the time-of-flight technique, while the position of the neutron detection is deduced from the time-difference information from photomultipliers attached to both ends of each bar. A novel wrapping method has been developed for the plastic scintillators. The array has a larger than 25% detection efficiency for neutrons of approximately 500 keV in kinetic energy and an angular resolution of less than 1 degree. Details of the design, construction and experimental tests of the spectrometer will be presented. Comment: 10 pages, 13 figures
Keywords	Physics - Instrumentation and Detectors ; Nuclear Experiment
Subject code	621
Publishing date	2013-10-23
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Perspectives for photofission studies with highly brilliant, monochromatic γ–ray beams

Tesileanu O. / Stroe L. / Glodariu T. / Filipescu D. / Jentschel M. / Krasznahorkay A. / Habs D. / Günther M. / Csige L. / Thirolf P.G. / Karwowski H. / Rich G.

EPJ Web of Conferences, Vol 38, p

2012 Volume 08001

Abstract: New research facilities like MEGa–Ray (Livermore) or ELI–NP (Bucharest) will provide within the next years (2013–2016) photon beams of unprecedented quality with respect to both photon intensity (total flux ~ 1013 γ/s) and spectral intensity (~ (104–106)/ ...

Abstract	New research facilities like MEGa–Ray (Livermore) or ELI–NP (Bucharest) will provide within the next years (2013–2016) photon beams of unprecedented quality with respect to both photon intensity (total flux ~ 1013 γ/s) and spectral intensity (~ (104–106)/eVs), thus exceeding the performance of existing facilities by severalorders of magnitude. This tremendous progress will be enabled by Compton-backscattering of an intense laser off a high-quality electron beam, in conjunction with novel refractive bremsstrahlung beams focusing γ optics and efficient monochromatization techniques. We envisage to employ these γ beams for photofission studies on extremely deformed nuclear states of actinides, investigating their multiple–humped potential energy landscape in a highly selective way. Transmission resonances in the prompt fission cross section from the (superdeformed) second and (hyperdeformed) third potential minimum will be studied, where the fission decay channel can be expressed as a tunnelling process of these gateway states through the multiple–humped fission barrier.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Subject code	535
Language	English
Publishing date	2012-12-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Characterization of Large Volume 3.5″ x 8″ LaBr3:Ce Detectors for the HECTOR+ array

Camera F. / Giaz A. / Pellegri L. / Riboldi S. / Blasi N. / Boiano C. / Bracco A. / Brambilla S. / Ceruti S. / Coelli S. / Crespi F.C.L. / Csatlòs M. / Krasznahorkay A. / Gulyàs J. / Lodetti S. / Frega S. / Miani A. / Million B. / Stuhl L. /

Wieland O.

EPJ Web of Conferences, Vol 66, p

2014 Volume 11008

Abstract: A selection of the properties of large volume, cylindrical 3.5” x 8” LaBr3:Ce scintillation detectors coupled to a 3.5” PMT (model R10233-1000SEL from HAMAMATSU) and a special designed Voltage Divider (LABRVD) will be discussed. A number of 10 of such ... ...

Abstract	A selection of the properties of large volume, cylindrical 3.5” x 8” LaBr3:Ce scintillation detectors coupled to a 3.5” PMT (model R10233-1000SEL from HAMAMATSU) and a special designed Voltage Divider (LABRVD) will be discussed. A number of 10 of such detectors constitute the HECTOR+ array which, in fall 2012, measured at GSI coupled to the AGATA DEMOSTRATOR at the PRESPEC experimental setup. These crystals are among the largest ever produced and needed to be characterized. We have performed several tests and here we discuss, in particular, the energy resolution measured using monochromatic γ−ray sources and in-beam reactions producing γ−rays up to 22.6 MeV. As already measured in two previous works a saturation in the energy resolution was observed in case of high energy gamma rays. Crystal non-homogeneities and PMT gain drifts can affect the resolution of measurements especially in case of high energy γ−rays.
Keywords	Physics ; QC1-999 ; Science ; Q
Language	English
Publishing date	2014-03-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Observation of low- and high-energy Gamow-Teller phonon excitations in nuclei.

Fujita, Y / Fujita, H / Adachi, T / Bai, C L / Algora, A / Berg, G P A / von Brentano, P / Colò, G / Csatlós, M / Deaven, J M / Estevez-Aguado, E / Fransen, C / De Frenne, D / Fujita, K / Ganioğlu, E / Guess, C J / Gulyás, J / Hatanaka, K / Hirota, K /

Honma, M / Ishikawa, D / Jacobs, E / Krasznahorkay, A / Matsubara, H / Matsuyanagi, K / Meharchand, R / Molina, F / Muto, K / Nakanishi, K / Negret, A / Okamura, H / Ong, H J / Otsuka, T / Pietralla, N / Perdikakis, G / Popescu, L / Rubio, B / Sagawa, H / Sarriguren, P / Scholl, C / Shimbara, Y / Shimizu, Y / Susoy, G / Suzuki, T / Tameshige, Y / Tamii, A / Thies, J H / Uchida, M / Wakasa, T / Yosoi, M / Zegers, R G T / Zell, K O / Zenihiro, J

Physical review letters

2014 Volume 112, Issue 11, Page(s) 112502

Abstract: Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in ((3)He, t) charge- ... ...

Abstract	Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in ((3)He, t) charge-exchange reactions. In the (42)Ca → (42)Sc reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the (54)Fe → (54)Co reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.
Language	English
Publishing date	2014-03-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.112.112502
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Article ; Online: Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in ^{132}Sn.

Yasuda, J / Sasano, M / Zegers, R G T / Baba, H / Bazin, D / Chao, W / Dozono, M / Fukuda, N / Inabe, N / Isobe, T / Jhang, G / Kameda, D / Kaneko, M / Kisamori, K / Kobayashi, M / Kobayashi, N / Kobayashi, T / Koyama, S / Kondo, Y /

Krasznahorkay, A J / Kubo, T / Kubota, Y / Kurata-Nishimura, M / Lee, C S / Lee, J W / Matsuda, Y / Milman, E / Michimasa, S / Motobayashi, T / Muecher, D / Murakami, T / Nakamura, T / Nakatsuka, N / Ota, S / Otsu, H / Panin, V / Powell, W / Reichert, S / Sakaguchi, S / Sakai, H / Sako, M / Sato, H / Shimizu, Y / Shikata, M / Shimoura, S / Stuhl, L / Sumikama, T / Suzuki, H / Tangwancharoen, S / Takaki, M / Takeda, H / Tako, T / Togano, Y / Tokieda, H / Tsubota, J / Uesaka, T / Wakasa, T / Yako, K / Yoneda, K / Zenihiro, J

Physical review letters

2018 Volume 121, Issue 13, Page(s) 132501

Abstract: The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216 MeV/u on a ... ...

Abstract	The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, ^{132}Sn with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from ^{132}Sn leading to ^{132}Sb exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst) MeV with the width of Γ=4.7±0.8 MeV. The integrated GT strength up to E_{x}=25 MeV is S_{GT}^{-}=53±5(stat)_{-10}^{+11}(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g^{'}=0.68±0.07, thanks to the high sensitivity of the GTR energy to g^{'}. In combination with previous studies on the GTR for ^{90}Zr and ^{208}Pb, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208.
Language	English
Publishing date	2018-05-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.132501
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Article: Dilepton decay from excited states in 28Si populated via different isospin entrance channels.

Buda / Bacelar / Balanda / Krasznahorkay / van der Ploeg H / Sujkowski / van der Woude A

Physical review. C, Nuclear physics

1996 Volume 53, Issue 1, Page(s) 157–167

Language	English
Publishing date	1996-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	209771-0
ISSN	1089-490X ; 0556-2813 ; 2469-9985
ISSN (online)	1089-490X
ISSN	0556-2813 ; 2469-9985
DOI	10.1103/physrevc.53.157
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Article ; Online: Reactor decay heat in 239Pu: solving the γ discrepancy in the 4-3000-s cooling period.

Algora, A / Jordan, D / Taín, J L / Rubio, B / Agramunt, J / Perez-Cerdan, A B / Molina, F / Caballero, L / Nácher, E / Krasznahorkay, A / Hunyadi, M D / Gulyás, J / Vitéz, A / Csatlós, M / Csige, L / Aysto, J / Penttilä, H / Moore, I D / Eronen, T /

Jokinen, A / Nieminen, A / Hakala, J / Karvonen, P / Kankainen, A / Saastamoinen, A / Rissanen, J / Kessler, T / Weber, C / Ronkainen, J / Rahaman, S / Elomaa, V / Rinta-Antila, S / Hager, U / Sonoda, T / Burkard, K / Hüller, W / Batist, L / Gelletly, W / Nichols, A L / Yoshida, T / Sonzogni, A A / Peräjärvi, K

Physical review letters

2010 Volume 105, Issue 20, Page(s) 202501

Abstract: The β feeding probability of (102,104,105,106,107)Tc, 105Mo, and 101Nb nuclei, which are important contributors to the decay heat in nuclear reactors, has been measured using the total absorption technique. We have coupled for the first time a total ... ...

Abstract	The β feeding probability of (102,104,105,106,107)Tc, 105Mo, and 101Nb nuclei, which are important contributors to the decay heat in nuclear reactors, has been measured using the total absorption technique. We have coupled for the first time a total absorption spectrometer to a Penning trap in order to obtain sources of very high isobaric purity. Our results solve a significant part of a long-standing discrepancy in the γ component of the decay heat for 239Pu in the 4-3000 s range.
Language	English
Publishing date	2010-11-12
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.105.202501
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Article ; Online: First EXL experiment with stored radioactive beam

Schmid M. von / Bagchi S. / Bönig S. / Csatlós M. / Dillmann I. / Dimopoulou C. / Egelhof P. / Eremin V. / Furuno T. / Geissel H. / Gernhäuser R. / Harakeh M. N. / Hartig A.-L. / Ilieva S. / Kalantar-Nayestanaki N. / Kiselev O. / Kollmus H. / Kozhuharov C. / Krasznahorkay A. /

Kröll T. / Kuilman M. / Litvinov S. / Litvinov Yu. A. / Mahjour-Shafiei M. / Mutterer M. / Nagae D. / Najafi M. A. / Nociforo C. / Nolden F. / Popp U. / Rigollet C. / Roy S. / Scheidenberger C. / Steck M. / Streicher B. / Stuhl L. / Thürauf M. / Uesaka T. / Weick H. / Winfield J. S. / Winters D. / Woods P. J. / Yamaguchi T. / Yue K. / Zamora J. C. / Zenihiro J.

EPJ Web of Conferences, Vol 66, p

Proton scattering on 56Ni

2014 Volume 03093

Abstract: EXL (EXotic nuclei studied in Light-ion induced reactions at the NESR storage ring) is a project within NUSTAR at FAIR. It aims at investigations of light-ion induced direct reactions in inverse kinematics with radioactive ions cooled and stored in the ... ...

Abstract	EXL (EXotic nuclei studied in Light-ion induced reactions at the NESR storage ring) is a project within NUSTAR at FAIR. It aims at investigations of light-ion induced direct reactions in inverse kinematics with radioactive ions cooled and stored in the future NESR (New Experimental Storage Ring). The existing ESR (Experimental Storage Ring) at GSI, together with its internal gas-jet target, provides a unique opportunity to perform such kind of experiments on a smaller scale at the present time. We have developed a UHV-compatible (Ultra High Vacuum) detector setup mainly based on DSSDs (Double-sided Silicon-Strip Detector) for the target-like recoils [4]. With this setup we were able to successfully investigate reactions with a stored radioactive beam for the first time ever. As a part of the first EXL campaign we investigated the reaction 56Ni(p,p)56Ni in inverse kinematics in order to measure the differential cross section for elastic proton scattering and deduce the nuclear-matter distribution and radius of 56Ni. In the following, the experimental setup is introduced in more detail, and the current status of the ongoing analysis is discussed.
Keywords	Physics ; QC1-999 ; Science ; Q
Subject code	540
Language	English
Publishing date	2014-03-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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