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Article ; Online: Search for a Neutron Dark Decay in ^{6}He.

Le Joubioux, M / Savajols, H / Mittig, W / Fléchard, X / Hayen, L / Penionzhkevich, Yu E / Ackermann, D / Borcea, C / Caceres, L / Delahaye, P / Didierjean, F / Franchoo, S / Grillet, A / Jacquot, B / Lebois, M / Ledoux, X / Lecesne, N / Liénard, E / Lukyanov, S /

Naviliat-Cuncic, O / Piot, J / Singh, A / Smirnov, V / Stodel, C / Testov, D / Thisse, D / Thomas, J C / Verney, D

Physical review letters

2024 Volume 132, Issue 13, Page(s) 132501

Abstract: Neutron dark decays have been suggested as a solution to the discrepancy between bottle and beam experiments, providing a dark matter candidate that can be searched for in halo nuclei. The free neutron in the final state following the decay of ^{6}He ... ...

Abstract	Neutron dark decays have been suggested as a solution to the discrepancy between bottle and beam experiments, providing a dark matter candidate that can be searched for in halo nuclei. The free neutron in the final state following the decay of ^{6}He into ^{4}He+n+χ provides an exceptionally clean detection signature when combined with a high efficiency neutron detector. Using a high-intensity ^{6}He^{+} beam at Grand Accélérateur National d'Ions Lourds, a search for a coincident neutron signal resulted in an upper limit on a dark decay branching ratio of Br_{χ}≤4.0×10^{-10} (95% C.L.). Using the dark neutron decay model proposed originally by Fornal and Grinstein, we translate this into an upper bound on a dark neutron branching ratio of O(10^{-5}), improving over global constraints by one to several orders of magnitude depending on m_{χ}.
Language	English
Publishing date	2024-04-13
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.132.132501
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Article ; Online: Fusion-evaporation studies with the Super Separator spectrometer (S3) at Spiral2

Déchery F. / Boutin D. / Amthor A. M. / Drouart A. / Nolen J. A. / Savajols H.

EPJ Web of Conferences, Vol 17, p

2011 Volume 14004

Abstract: The Super Separator Spectrometer S3 is a device designed for experiments with the very high intensity stable ion beam of the superconducting linear accelerator of the SPIRAL2 facility. Its Physics goals cover the study of radioactive ions produced by ... ...

Abstract	The Super Separator Spectrometer S3 is a device designed for experiments with the very high intensity stable ion beam of the superconducting linear accelerator of the SPIRAL2 facility. Its Physics goals cover the study of radioactive ions produced by fusion-evaporation reactions, like superheavy elements or neutron deficient nuclei close to the proton drip line, but also neutron rich nuclei produced by multi-nucleon transfer reactions as well as ion-ion atomic interactions. It is composed of a two-step separator, with a momentum achromat followed by a mass spectrometer. Superconducting multipole triplets, combining quadruple, sextuple and octupole fields, allow a combination of high transmission and mass resolution. A specific open multipole has been designed to stop the high beam power at the first momentum dispersive plane. A decay spectroscopy detection set-up or a low energy branch can be coupled to S3 for a wide range of studies.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Subject code	535
Language	English
Publishing date	2011-10-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Evidence of soft dipole resonance in ^{11}li with isoscalar character.

Kanungo, R / Sanetullaev, A / Tanaka, J / Ishimoto, S / Hagen, G / Myo, T / Suzuki, T / Andreoiu, C / Bender, P / Chen, A A / Davids, B / Fallis, J / Fortin, J P / Galinski, N / Gallant, A T / Garrett, P E / Hackman, G / Hadinia, B / Jansen, G /

Keefe, M / Krücken, R / Lighthall, J / McNeice, E / Miller, D / Otsuka, T / Purcell, J / Randhawa, J S / Roger, T / Rojas, A / Savajols, H / Shotter, A / Tanihata, I / Thompson, I J / Unsworth, C / Voss, P / Wang, Z

Physical review letters

2015 Volume 114, Issue 19, Page(s) 192502

Abstract: The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported. The experiment was performed at the newly commissioned IRIS facility at TRIUMF. ... ...

Abstract	The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported. The experiment was performed at the newly commissioned IRIS facility at TRIUMF. The results show a resonance peak at an excitation energy of 1.03±0.03 MeV with a width of 0.51±0.11 MeV (FWHM). The angular distribution is consistent with a dipole excitation in the distorted-wave Born approximation framework. The observed resonance energy together with shell model calculations show the first signature that the monopole tensor interaction is important in ^{11}Li. The first ab initio calculations in the coupled cluster framework are also presented.
Language	English
Publishing date	2015-05-15
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.114.192502
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Article ; Online: New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces.

Gallant, A T / Bale, J C / Brunner, T / Chowdhury, U / Ettenauer, S / Lennarz, A / Robertson, D / Simon, V V / Chaudhuri, A / Holt, J D / Kwiatkowski, A A / Mané, E / Menéndez, J / Schultz, B E / Simon, M C / Andreoiu, C / Delheij, P / Pearson, M R / Savajols, H /

Schwenk, A / Dilling, J

Physical review letters

2012 Volume 109, Issue 3, Page(s) 32506

Abstract: We present precision Penning trap mass measurements of neutron-rich calcium and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN system, the mass of 51K was measured for the first time, and the precision of the (51,52)Ca mass ... ...

Abstract	We present precision Penning trap mass measurements of neutron-rich calcium and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN system, the mass of 51K was measured for the first time, and the precision of the (51,52)Ca mass values were improved significantly. The new mass values show a dramatic increase of the binding energy compared to those reported in the atomic mass evaluation. In particular, 52Ca is more bound by 1.74 MeV, and the behavior with neutron number deviates substantially from the tabulated values. An increased binding was predicted recently based on calculations that include three-nucleon (3N) forces. We present a comparison to improved calculations, which agree remarkably with the evolution of masses with neutron number, making neutron-rich calcium isotopes an exciting region to probe 3N forces.
Language	English
Publishing date	2012-07-20
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.109.032506
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Article ; Online: Measurement of the isoscalar monopole response in the neutron-rich nucleus 68Ni.

Vandebrouck, M / Gibelin, J / Khan, E / Achouri, N L / Baba, H / Beaumel, D / Blumenfeld, Y / Caamaño, M / Càceres, L / Colò, G / Delaunay, F / Fernandez-Dominguez, B / Garg, U / Grinyer, G F / Harakeh, M N / Kalantar-Nayestanaki, N / Keeley, N / Mittig, W / Pancin, J /

Raabe, R / Roger, T / Roussel-Chomaz, P / Savajols, H / Sorlin, O / Stodel, C / Suzuki, D / Thomas, J C

Physical review letters

2014 Volume 113, Issue 3, Page(s) 32504

Abstract: The isoscalar monopole response has been measured in the unstable nucleus (68)Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was ... ...

Abstract	The isoscalar monopole response has been measured in the unstable nucleus (68)Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 ± 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L=0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei.
Language	English
Publishing date	2014-07-18
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.113.032504
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Article ; Online: Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion.

Ferrer, R / Barzakh, A / Bastin, B / Beerwerth, R / Block, M / Creemers, P / Grawe, H / de Groote, R / Delahaye, P / Fléchard, X / Franchoo, S / Fritzsche, S / Gaffney, L P / Ghys, L / Gins, W / Granados, C / Heinke, R / Hijazi, L / Huyse, M /

Kron, T / Kudryavtsev, Yu / Laatiaoui, M / Lecesne, N / Loiselet, M / Lutton, F / Moore, I D / Martínez, Y / Mogilevskiy, E / Naubereit, P / Piot, J / Raeder, S / Rothe, S / Savajols, H / Sels, S / Sonnenschein, V / Thomas, J-C / Traykov, E / Van Beveren, C / Van den Bergh, P / Van Duppen, P / Wendt, K / Zadvornaya, A

Nature communications

2017 Volume 8, Page(s) 14520

Abstract: Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and electromagnetic multipole moments of these nuclei. However, in such ... ...

Abstract	Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and electromagnetic multipole moments of these nuclei. However, in such measurements it is difficult to combine a high efficiency with a high spectral resolution. Here we demonstrate the on-line application of atomic laser ionization spectroscopy in a supersonic gas jet, a technique suited for high-precision studies of the ground- and isomeric-state properties of nuclei located at the extremes of stability. The technique is characterized in a measurement on actinium isotopes around the N=126 neutron shell closure. A significant improvement in the spectral resolution by more than one order of magnitude is achieved in these experiments without loss in efficiency.
Language	English
Publishing date	2017-02-22
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	2041-1723
ISSN (online)	2041-1723
DOI	10.1038/ncomms14520
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Article: Resonance state in 7H.

Caamaño, M / Cortina-Gil, D / Mittig, W / Savajols, H / Chartier, M / Demonchy, C E / Fernández, B / Gómez Hornillos, M B / Gillibert, A / Jurado, B / Kiselev, O / Lemmon, R / Obertelli, A / Rejmund, F / Rejmund, M / Roussel-Chomaz, P / Wolski, R

Physical review letters

2007 Volume 99, Issue 6, Page(s) 62502

Abstract: The existence of the 7H nuclear system was investigated via a one-proton transfer reaction with a 8He beam at 15.4A MeV and a 12C gas target. The experimental setup was based on the active-target MAYA which allowed a complete reconstruction of the ... ...

Abstract	The existence of the 7H nuclear system was investigated via a one-proton transfer reaction with a 8He beam at 15.4A MeV and a 12C gas target. The experimental setup was based on the active-target MAYA which allowed a complete reconstruction of the reaction kinematics. The existence of the 7H was confirmed with the identification of seven events where the system was formed with a resonance energy of 0.57(-0.21)(+0.42) MeV above the 3H+4n threshold and a resonance width of 0.09(-0.06)(+0.94) MeV. This study represents an unambiguous proof of the existence of the most neutron-proton unbalanced system presently found.
Language	English
Publishing date	2007-08-10
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.99.062502
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Article: Internal gamma decay and the superallowed branching ratio for the beta(+) emitter (38)K(m).

Leach, K G / Svensson, C E / Ball, G C / Leslie, J R / Austin, R A E / Bandyopadhyay, D / Barton, C / Bassiachvilli, E / Ettenauer, S / Finlay, P / Garrett, P E / Grinyer, G F / Hackman, G / Melconian, D / Morton, A C / Mythili, S / Newman, O / Pearson, C J / Pearson, M R /

Phillips, A A / Savajols, H / Schumaker, M A / Wong, J

Physical review letters

2008 Volume 100, Issue 19, Page(s) 192504

Abstract: The branching ratio for the superallowed beta(+) decay of (38)K(m) was measured at TRIUMF's ISAC radioactive ion beam facility. The M3 internal transition between the isomer and the ground state of (38)K(m) was observed with a branching ratio of 330(43) ... ...

Abstract	The branching ratio for the superallowed beta(+) decay of (38)K(m) was measured at TRIUMF's ISAC radioactive ion beam facility. The M3 internal transition between the isomer and the ground state of (38)K(m) was observed with a branching ratio of 330(43) ppm. A search for the nonanalogue beta-decay branch to the first excited 0(+) state in (38)Ar was also performed and yielded an upper limit of < or =12 ppm at 90% C.L. These measurements lead to a revised superallowed branching ratio for (38)K(m) of 99.967(4)%, and increase the (38)K(m) ft value by its entire quoted uncertainty to ft=3052.1(10) s. Implications for tests of the nuclear-structure dependent corrections in superallowed beta decays and the extraction of the Cabibbo-Kobayashi-Maskawa matrix element V(ud) are discussed.
Language	English
Publishing date	2008-05-16
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.100.192504
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Article ; Online: Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction.

Catford, W N / Timis, C N / Lemmon, R C / Labiche, M / Orr, N A / Fernández-Domínguez, B / Chapman, R / Freer, M / Chartier, M / Savajols, H / Rejmund, M / Achouri, N L / Amzal, N / Ashwood, N I / Baldwin, T D / Burns, M / Caballero, L / Casadjian, J M / Curtis, N /

de France, G / Gelletly, W / Liang, X / Pain, S D / Pucknell, V P E / Rubio, B / Sorlin, O / Spohr, K / Theisen, Ch / Warner, D D

Physical review letters

2010 Volume 104, Issue 19, Page(s) 192501

Abstract: The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of ... ...

Abstract	The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
Language	English
Publishing date	2010-05-14
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.104.192501
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Article: Measurement of the two-halo neutron transfer reaction (1)H((11)Li, (9)Li)(3)H at 3A MeV.

Tanihata, I / Alcorta, M / Bandyopadhyay, D / Bieri, R / Buchmann, L / Davids, B / Galinski, N / Howell, D / Mills, W / Mythili, S / Openshaw, R / Padilla-Rodal, E / Ruprecht, G / Sheffer, G / Shotter, A C / Trinczek, M / Walden, P / Savajols, H / Roger, T /

Caamano, M / Mittig, W / Roussel-Chomaz, P / Kanungo, R / Gallant, A / Notani, M / Savard, G / Thompson, I J

Physical review letters

2008 Volume 100, Issue 19, Page(s) 192502

Abstract: The p((11)Li, (9)Li)t reaction has been studied for the first time at an incident energy of 3A MeV at the new ISAC-2 facility at TRIUMF. An active target detector MAYA, built at GANIL, was used for the measurement. The differential cross sections have ... ...

Abstract	The p((11)Li, (9)Li)t reaction has been studied for the first time at an incident energy of 3A MeV at the new ISAC-2 facility at TRIUMF. An active target detector MAYA, built at GANIL, was used for the measurement. The differential cross sections have been determined for transitions to the (9)Li ground and first excited states in a wide range of scattering angles. Multistep transfer calculations using different (11)Li model wave functions show that wave functions with strong correlations between the halo neutrons are the most successful in reproducing the observation.
Language	English
Publishing date	2008-05-16
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.100.192502
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