30 results on '"Gavin Lotay"'
Search Results
2. New constraints on the Al25(p,γ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions
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T. Lauritsen, Jordi José, L. Canete, D. T. Doherty, Sergio Almaraz-Calderon, Anu Kankainen, R. V. F. Janssens, G. Christian, R. Wilkinson, W. N. Catford, D. Seweryniak, Gavin Lotay, S. Hallam, H. M. Albers, S. Zhu, C. J. Chiara, E. A. Bennett, John P. Greene, M. Moukaddam, Shuya Ota, M. P. Carpenter, Calem Hoffman, Antti Saastamoinen, and A. Matta
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Physics ,Nuclear reaction ,Radiative capture ,Flux ,Resonance ,Nova (laser) ,Atomic physics ,Spectroscopy - Abstract
The astrophysical $^{25}\mathrm{Al}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{26}\mathrm{Si}$ reaction represents one of the key remaining uncertainties in accurately modeling the abundance of radiogenic $^{26}\mathrm{Al}$ ejected from classical novae. Specifically, the strengths of key proton-unbound resonances in $^{26}\mathrm{Si}$, that govern the rate of the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})$ reaction under explosive astrophysical conditions, remain unsettled. Here, we present a detailed spectroscopy study of the $^{26}\mathrm{Si}$ mirror nucleus $^{26}\mathrm{Mg}$. We have measured the lifetime of the ${3}^{+}$, 6.125-MeV state in $^{26}\mathrm{Mg}$ to be $19(3)\phantom{\rule{0.28em}{0ex}}\mathrm{fs}$ and provide compelling evidence for the existence of a ${1}^{\ensuremath{-}}$ state in the $T=1,\phantom{\rule{0.28em}{0ex}}A=26$ system, indicating a previously unaccounted for $\ensuremath{\ell}=1$ resonance in the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})$ reaction. Using the presently measured lifetime, together with the assumption that the likely ${1}^{\ensuremath{-}}$ state corresponds to a resonance in the $^{25}\mathrm{Al}+p$ system at 435.7(53) keV, we find considerable differences in the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})$ reaction rate compared to previous works. Based on current nova models, we estimate that classical novae may be responsible for up to $\ensuremath{\approx}15%$ of the observed galactic abundance of $^{26}\mathrm{Al}$.
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- 2021
3. Level structure of the Tz=−1 nucleus Ar34 and its relevance for nucleosynthesis in ONe novae
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K. Hadyńska-Klȩk, G. L. Wilson, T. Huang, T. Lauritsen, F. G. Kondev, R. V. F. Janssens, Jordi José, D. Seweryniak, Gavin Lotay, Guy Savard, D. T. Doherty, J. Saiz, S. Hallam, M. P. Carpenter, S. Jazrawi, S. Stolze, A. M. Rogers, S. Zhu, Kalle Auranen, W. N. Catford, J. Li, Catherine Deibel, D. E. M. Hoff, A. R. L. Kennington, and Corina Andreoiu
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Physics ,Proton ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Coupling (probability) ,01 natural sciences ,7. Clean energy ,Nuclear physics ,Nucleosynthesis ,Excited state ,0103 physical sciences ,Nuclear astrophysics ,Nuclear fusion ,010306 general physics ,Spectroscopy ,Energy (signal processing) - Abstract
The $^{24}\mathrm{Mg}+^{12}\mathrm{C}$ fusion reaction was used to perform a detailed $\ensuremath{\gamma}$-ray spectroscopy study of the astrophysically important nucleus $^{34}\mathrm{Ar}$. In particular, an experimental setup, coupling the advanced $\ensuremath{\gamma}$-ray tracking array GRETINA with the well-established Argonne fragment mass analyzer (FMA), was employed to obtain excitation energies and spin-parity assignments for excited states in $^{34}\mathrm{Ar}$, both above and below the proton separation energy. For the first time, an angular distribution analysis of in-beam $\ensuremath{\gamma}$ rays from fusion-evaporation reactions, using a tracking array, has been performed and Coulomb energy differences of analog states in the $T=1,$ $A=34$ mirror system, explored from 0 to 6 MeV. Furthermore, we present a comprehensive discussion of the astrophysical $^{33}\mathrm{Cl}(p,\ensuremath{\gamma})$ stellar reaction rate, together with implications for the identification of nova presolar grains from sulfur isotopic abundances.
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- 2021
4. Isomeric and β -decay spectroscopy of Ho173,174
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P. Lee, Zs. Dombrádi, I. Nishizuka, P. M. Walker, C. M. Shand, Naohito Inabe, F. G. Kondev, Jinguang Wu, Zs. Vajta, Eiji Ideguchi, Jenny Lee, Shigeru Kubono, C. S. Lee, S. Kanaya, N. Kurz, Oliver J. Roberts, Ayumi Yagi, C. R. Nita, Atsuko Odahara, Zhengyu Xu, C. J. Griffin, Y. Shimizu, Z. Patel, G. X. Zhang, D. S. Ahn, H. Baba, V. H. Phong, Naoki Fukuda, Raymond J. Carroll, Hiroyoshi Sakurai, Gavin Lotay, S. Lalkovski, Zs. Podolyák, Toshiyuki Kubo, Shunji Nishimura, F. Browne, Eunji Lee, T. Isobe, A. Estrade, István Kuti, Satoru Terashima, G. J. Lane, Giuseppe Lorusso, Z. Korkulu, A. C. Dai, P. Doornenbal, P. H. Regan, Hiroshi Watanabe, H. Kanaoka, Furong Xu, Thamer Alharbi, H. Schaffner, K. Y. Chae, P. A. Söderström, Toshiyuki Sumikama, Hiroyuki Takeda, Alison Bruce, J. J. Valiente-Dobón, J. Liu, Chang-Bum Moon, Hiroshi Suzuki, and I. Kojouharov
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Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Physical chemistry ,010306 general physics ,Spectroscopy ,01 natural sciences ,Beta decay - Published
- 2020
5. Search for Nova Presolar Grains: γ -Ray Spectroscopy of Ar34 and its Relevance for the Astrophysical Cl33(p,γ) Reaction
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F. G. Kondev, T. Huang, G. L. Wilson, J. Li, D. E. M. Hoff, Jordi José, T. Lauritsen, Sanna Stolze, R. V. F. Janssens, M. P. Carpenter, W. N. Catford, A. R. L. Kennington, A. M. Rogers, K. Hadynska-Klek, Corina Andreoiu, C. M. Deibel, D. T. Doherty, S. Hallam, D. Seweryniak, Gavin Lotay, S. Jazrawi, J. Saiz, Guy Savard, Kalle Auranen, and S. Zhu
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Engineering ,business.industry ,Presolar grains ,0103 physical sciences ,General Physics and Astronomy ,Library science ,User Facility ,010306 general physics ,business ,01 natural sciences - Abstract
This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DEAC02-06CH11357 and Grants No. DEFG02-94-ER40834, DEFG02-97-ER41041, DEFG02-97-ER41043, DEFG02-94-ER40848, and DESC0014231. UK personnel were supported by the Science and Technologies Facilities Council (STFC) and C. A. was supported by the Natural Sciences and Engineering Research Council of Canada. J. J. acknowledges support by the Spanish MINECO Grant No. AYA2017-86274-P, by the E. U. FEDER funds, and by the AGAUR/Generalitat de Catalunya Grant No. SGR661/2017. This research uses resources of ANL’s ATLAS facility, which is a DOE Office of Science User facility.
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- 2020
6. γ -ray spectroscopy of a four-quasiparticle isomer band in Re174
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Raymond J. Carroll, Alan Mitchell, Claes Fahlander, A. Akber, T. Palazzo, R. Shearman, Andrew Stuchbery, M. S. M. Gerathy, Tibor Kibedi, V. Margerin, J. J. Carroll, P. M. Walker, Gavin Lotay, N. Palalani, Furong Xu, G. J. Lane, Matthew Reed, H. M. Albers, D. M. Cullen, S. S. Hota, Zena Patel, and A. C. Dai
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Physics ,010308 nuclear & particles physics ,Excited state ,0103 physical sciences ,Potential energy surface ,Quasiparticle ,Level structure ,State (functional analysis) ,Atomic physics ,010306 general physics ,Nucleon ,Spectroscopy ,01 natural sciences - Abstract
Excited states in $^{174}\mathrm{Re}$ have been populated in fusion-evaporation reactions at the Australian National University, and $\ensuremath{\gamma}$-ray spectroscopy has been used to determine the level structure and to deduce the underlying nucleon configurations. The half-life of the bandhead of the ${K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}$ band has been measured to be 2.7(4) ns. A band built on an isomeric state of spin-parity (${14}^{\ensuremath{-}}$) and a half-life of 53(5) ns has been observed here for the first time, and has been determined to have a four-quasiparticle structure. Contrasting reduced-hindrance values for its decay are discussed in terms of deformation and configuration changes, as indicated by configuration-constrained potential energy surface calculations.
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- 2020
7. Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the ν -Ball spectrometer
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K. Hadynska-Klek, S. Bottoni, Stephan Oberstedt, D. T. Doherty, P. A. Söderström, D. Thisse, R. Shearman, V. Sánchez-Tembleque, V. Vedia, V. Karayonchev, S. Courtin, Zs. Podolyák, Giuseppe Lorusso, J. N. Wilson, G. Häfner, M. Rudigier, C. R. Niţă, M. Lebois, Mohammad Nakhostin, M. Brunet, L. M. Fraile, W. Witt, A. R. L. Kennington, L. Qi, Gavin Lotay, N. Jovancevic, R.L. Canavan, N. Cieplicka-Oryńczak, Ł. W. Iskra, Sean Collins, P. H. Regan, J.-M. Régis, M. Heine, J. Benito, and P. Koseoglou
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Physics ,Spectrometer ,010308 nuclear & particles physics ,Yrast ,Nuclear Theory ,Gamma ray ,Nuclear structure ,Coulomb excitation ,01 natural sciences ,Excited state ,0103 physical sciences ,Quadrupole ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Spectroscopy - Abstract
We report on the measurement of lifetimes of excited states in the near-mid-shell nuclei Dy164,166 using the gamma-ray coincidence fast-timing method. The nuclei of interest were populated using reactions between an O18 beam and a gold-backed isotopically enriched Dy164 target of thickness 6.3mg/cm2 at primary beam energies of 71, 76, and 80 MeV from the IPN-Orsay laboratory, France. Excited states were populated in Dy164, Dy166, and W178,179 following Coulomb excitation, inelastic nuclear scattering, two-neutron transfer, and fusion-evaporation reaction channels respectively. Gamma rays from excited states were measured using the ν-Ball high-purity germanium (HPGe)-LaBr3 hybrid γ-ray spectrometer with the excited state lifetimes extracted using the fast-timing coincidence method using HPGe-gated LaBr3-LaBr3 triple coincident events. The lifetime of the first Iπ=2+ excited state in Dy166 was used to determine the transition quadrupole deformation of this neutron-rich nucleus for the first time. The experimental methodology was validated by showing consistency with previously determined excited state lifetimes in Dy164. The half-lives of the yrast 2+ states in Dy164 and Dy166 were 2.35(6) and 2.3(2) ns, respectively, corresponding to transition quadrupole moment values of Q0=7.58(9) and 7.5(4) eb, respectively. The lifetime of the yrast 2+ state in Dy166 is consistent with a quenching of nuclear quadrupole deformation at β≈0.35 as the N=104 mid-shell is approached.
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- 2020
8. Fast-timing measurements in the ground-state band of Pd114
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T. Lauritsen, T. Kröll, L. A. Gurgi, F. G. Kondev, G. J. Lane, I. Burrows, D. M. Cullen, O. Yordanov, S. Lalkovski, Alison Bruce, John P. Greene, T. Daniel, V. F. E. Pucknell, D. Seweryniak, D. J. Hartley, Gavin Lotay, C. M. Shand, M. Smolen, T. Berry, S. Bottoni, C. R. Niţă, E. A. Stefanova, J. Sethi, E.R. Gamba, R. Ilieva, M. Carmona Gallardo, S. Zhu, J. Rohrer, J. T. Anderson, A. D. Ayangeakaa, S. Ilieva, J. Simpson, Matthew Reed, M. P. Carpenter, P. Copp, M. Rudigier, V. Vedia, I.H. Lazarus, P. H. Regan, Raymond J. Carroll, Zs. Podolyák, and G. Fernández Martínez
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Physics ,Work (thermodynamics) ,Isotope ,Yrast ,chemistry.chemical_element ,medicine.anatomical_structure ,chemistry ,medicine ,Gammasphere ,Interacting boson model ,Atomic physics ,Ground state ,Nucleus ,Palladium - Abstract
Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in ¹¹⁴Pd populated via ²⁵²Cf decay, have been measured. The measured lifetimes are τ₂+=103(10)ps, τ₄+=22(13)ps, and τ₆+≤10ps for the 2⁺₁, 4⁺₁, and 6⁺₁ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J−2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E₂)=B(E2;4⁺₁→2⁺₁)/B(E2;2⁺₁→0⁺₁)=0.80(42) is measured for the first time in ¹¹⁴Pd and compared with the known values RB(E₂) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.
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- 2019
9. Superallowed α Decay to Doubly Magic Sn100
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Catherine Scholey, W. B. Walters, C. J. Chiara, P. J. Woods, T. Lauritsen, Rashi Talwar, T. L. Khoo, J. L. Harker, D. T. Doherty, S. A. Kuvin, H. M. David, M. P. Carpenter, S. Zhu, D. Seweryniak, Gavin Lotay, J. Sethi, Kalle Auranen, A. D. Ayangeakaa, Calem Hoffman, P. Copp, M. Albers, A. M. Rogers, R. V. F. Janssens, and S. Bottoni
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Physics ,Crystallography ,Recoil ,010308 nuclear & particles physics ,0103 physical sciences ,General Physics and Astronomy ,Decay chain ,010306 general physics ,01 natural sciences ,7. Clean energy - Abstract
We report the first observation of the ^{108}Xe→^{104}Te→^{100}Sn α-decay chain. The α emitters, ^{108}Xe [E_{α}=4.4(2) MeV, T_{1/2}=58_{-23}^{+106} μs] and ^{104}Te [E_{α}=4.9(2) MeV, T_{1/2}
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- 2018
10. Direct measurement of astrophysically important resonances in K38(p,γ)Ca39
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A. Rojas, Devin Burke, D. A. Hutcheon, U. Hager, W. N. Catford, G. Christian, Barry Davids, Adam Mahl, C. Akers, Gavin Lotay, Chris Ruiz, A. Chen, D. Connolly, Jennifer Fallis, and X Sun
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Nuclear reaction ,Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Resonance ,White dwarf ,7. Clean energy ,01 natural sciences ,Spectral line ,Nuclear physics ,Recoil ,13. Climate action ,Nucleosynthesis ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Binary system ,Nuclide ,Nuclear Experiment ,010303 astronomy & astrophysics - Abstract
Background: Classical novae are cataclysmic nuclear explosions occurring when a white dwarf in a binary system accretes hydrogen-rich material from its companion star. Novae are partially responsible for the galactic synthesis of a variety of nuclides up to the calcium ( A ∼ 40 ) region of the nuclear chart. Although the structure and dynamics of novae are thought to be relatively well understood, the predicted abundances of elements near the nucleosynthesis endpoint, in particular Ar and Ca, appear to sometimes be in disagreement with astronomical observations of the spectra of nova ejecta. Purpose: One possible source of the discrepancies between model predictions and astronomical observations is nuclear reaction data. Most reaction rates near the nova endpoint are estimated only from statistical model calculations, which carry large uncertainties. For certain key reactions, these rate uncertainties translate into large uncertainties in nucleosynthesis predictions. In particular, the 38 K ( p , γ ) 39 Ca reaction has been identified as having a significant influence on Ar, K, and Ca production. In order to constrain the rate of this reaction, we have performed a direct measurement of the strengths of three candidate l = 0 resonances within the Gamow window for nova burning, at 386 ± 10 keV, 515 ± 10 keV, and 689 ± 10 keV. Method: The experiment was performed in inverse kinematics using a beam of unstable 38 K impinged on a windowless hydrogen gas target. The 39 Ca recoils and prompt γ rays from 38 K ( p , γ ) 39 Ca reactions were detected in coincidence using a recoil mass separator and a bismuth-germanate scintillator array, respectively. Results: For the 689 keV resonance, we observed a clear recoil- γ coincidence signal and extracted resonance strength and energy values of 120 + 50 − 30 ( stat . ) + 20 − 60 ( sys . ) meV and 679 + 2 − 1 ( stat . ) ± 1 ( sys . ) keV , respectively. We also performed a singles analysis of the recoil data alone, extracting a resonance strength of 120 ± 20 ( stat . ) ± 15 ( sys . ) meV, consistent with the coincidence result. For the 386 keV and 515 keV resonances, we extract 90 % confidence level upper limits of 2.54 meV and 18.4 meV, respectively. Conclusions: We have established a new recommended 38 K ( p , γ ) 39 Ca rate based on experimental information, which reduces overall uncertainties near the peak temperatures of nova burning by a factor of ∼ 250 . Using the rate obtained in this work in model calculations of the hottest oxygen-neon novae reduces overall uncertainties on Ar, K, and Ca synthesis to factors of 15 or less in all cases.
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- 2018
11. Direct Measurement of the Key Ec.m.=456 keV Resonance in the Astrophysical Ne19(p,γ)Na20 Reaction and Its Relevance for Explosive Binary Systems
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Gavin Lotay, C. Akers, Chris Ruiz, L. Martin, M. Williams, D. A. Hutcheon, D. Connolly, A. Lennarz, E. McNeice, R. Wilkinson, J. Riley, A. Chen, G. Christian, Alison Laird, W. N. Catford, D. Jedrejcic, and Barry Davids
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Physics ,010308 nuclear & particles physics ,General Physics and Astronomy ,Flux ,Resonance ,Nova (laser) ,Atmospheric temperature range ,rp-process ,7. Clean energy ,01 natural sciences ,Nuclear physics ,Reaction rate ,0103 physical sciences ,010306 general physics ,Beam (structure) ,P system - Abstract
We have performed a direct measurement of the 19Ne(p,γ)20Na reaction in inverse kinematics using a beam of radioactive 19Ne. The key astrophysical resonance in the 19Ne+p system has been definitely measured for the first time at Ec.m.=456+5−2 keV with an associated strength of 17+7−5 meV. The present results are in agreement with resonance strength upper limits set by previous direct measurements, as well as resonance energies inferred from precision (3He, t) charge exchange reactions. However, both the energy and strength of the 456 keV resonance disagree with a recent indirect study of the 19Ne(d, n)20Na reaction. In particular, the new 19Ne(p,γ)20Na reaction rate is found to be factors of ∼8 and ∼5 lower than the most recent evaluation over the temperature range of oxygen-neon novae and astrophysical x-ray bursts, respectively. Nevertheless, we find that the 19Ne(p,γ)20Na reaction is likely to proceed fast enough to significantly reduce the flux of 19F in nova ejecta and does not create a bottleneck in the breakout from the hot CNO cycles into the rp process.
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- 2017
12. Simultaneous measurement ofβ-delayed proton andγdecay ofP27
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E. McCleskey, D. T. Doherty, Philip Woods, Thomas Davinson, J. P. Wallace, A. Banu, Gavin Lotay, A. Spiridon, Brian Roeder, A. Saastamoinen, R. E. Tribble, M. McCleskey, and L. Trache
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Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,0103 physical sciences ,Isobaric process ,Atomic physics ,010306 general physics ,01 natural sciences - Abstract
This is the first study of $^{27}\mathrm{P}$ to measure both the $\ensuremath{\beta}$-delayed proton and $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ decays. While no new proton groups in the astrophysically interesting energy region of 300--400 keV were observed, a new upper limit on the proton branching of 0.16% was estimated. Several new $\ensuremath{\gamma}$-ray lines were observed, mainly coming from the isobaric analog state in $^{27}\mathrm{Si}$, which has been assigned a more accurate energy value of 6638(1) keV.
- Published
- 2016
13. Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei
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E. Sahin, H. Badran, Jari Partanen, Janne Pakarinen, W. Korten, D. M. Debenham, C. Scholey, Matti Leino, Joonas Konki, Panu Ruotsalainen, A.d Herzaáň, P. J. Davies, D. G. Jenkins, Rauno Julin, Philippos Papadakis, Jack Henderson, Gavin Lotay, S. Juutinen, T.a Haylett, P. Peura, Kalle Auranen, P.d Greenlees, Ulrika Jakobsson, Juha Sorri, L. Sinclair, Mikael Sandzelius, P. Joshi, M Mallaburn, H. M. David, Sanna Stolze, G. de Angelis, K.c Kaneko, R. Wadsworth, Tuomas Grahn, Juha Uusitalo, Panu Rahkila, Jan Sarén, and M. A. Bentley
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Physics ,010308 nuclear & particles physics ,Shell (structure) ,Space (mathematics) ,01 natural sciences ,Symmetry (physics) ,Nuclear physics ,medicine.anatomical_structure ,Isospin ,0103 physical sciences ,Isobar ,medicine ,Atomic physics ,010306 general physics ,Spin (physics) ,Spectroscopy ,Nucleus - Abstract
The recoil-β tagging technique has been used in conjunction with the 40 Ca(32 S ,2n) reaction at a beam energy of 88 MeV to identify transitions associated with the decay of the 2 + and, tentatively, 4 + states in the nucleus 70 Kr. These data are used, along with previously published data, to examine the triplet energy differences (TED) for the mass 70 isobars. The experimental TED values are compared with shell model calculations, performed with the JUN45 interaction in the fpg model space, that include a J = 0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV. The agreement is found to be very good up to spin 4 and supports the expectation for analog states that all three nuclei have the same oblate shape at low-spin. The A = 70 results are compared with the experimental and shell model predicted TED and mirror energy differences (MED) for the mass 66 and 74 systems. The comparisons clearly demonstrate the importance of the isotensor INC interaction in replicating the TED data in this region. Issues related to the observed MED values and their interpretation within the shell model are discussed.
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- 2016
14. First measurement of theRu96(p,γ)Rh97cross section for thepprocess with a storage ring
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O. Ershova, A. Kelic-Heil, Iris Dillmann, Klaus Blaum, K. Sümmerer, Gavin Lotay, Markus Steck, Ganna Rastrepina, K. Boretzky, Tudi Le Bleis, Zsolt Fülöp, Helmut Weick, Hans Geissel, F. Nolden, N. Winters, Christophor Kozhuharov, Nikolaos Petridis, F. Käppeler, György Gyürky, Michael Heil, Fritz Bosch, Rene Reifarth, Bo Mei, J. Marganiec, Thomas Aumann, G. Münzenberg, Ralf Plag, C. Langer, Christina Dimopoulou, Haik Simon, Carsten Brandau, Björn Riese, H. Bräuning, G. Weber, U. Popp, Tamás Szücs, Catherine Rigollet, Philip Woods, Thomas Stöhlker, Thomas Davinson, Jan Glorius, Kerstin Sonnabend, Danyal Winters, Christoph Scheidenberger, Qiping Zhong, Yuri A. Litvinov, and Shawn Bishop
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Physics ,Reaction rate ,Nuclear and High Energy Physics ,Cross section (physics) ,Proton ,Hydrogen ,chemistry ,chemistry.chemical_element ,Atomic physics ,Atmospheric temperature range ,Storage ring ,p-process ,Ion - Abstract
This work presents a direct measurement of the $^{96}$Ru($p, \gamma$)$^{97}$Rh cross section via a novel technique using a storage ring, which opens opportunities for reaction measurements on unstable nuclei. A proof-of-principle experiment was performed at the storage ring ESR at GSI in Darmstadt, where circulating $^{96}$Ru ions interacted repeatedly with a hydrogen target. The $^{96}$Ru($p, \gamma$)$^{97}$Rh cross section between 9 and 11 MeV has been determined using two independent normalization methods. As key ingredients in Hauser-Feshbach calculations, the $\gamma$-ray strength function as well as the level density model can be pinned down with the measured ($p, \gamma$) cross section. Furthermore, the proton optical potential can be optimized after the uncertainties from the $\gamma$-ray strength function and the level density have been removed. As a result, a constrained $^{96}$Ru($p, \gamma$)$^{97}$Rh reaction rate over a wide temperature range is recommended for $p$-process network calculations.
- Published
- 2015
15. Inverse Kinematic Study of theAl26g(d,p)Al27Reaction and Implications for Destruction ofAl26in Wolf-Rayet and Asymptotic Giant Branch Stars
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Jennifer Fallis, Philip Woods, J. A. Tostevin, A. Rojas, G. Christian, Barry Davids, D. T. Doherty, Gavin Lotay, Chris Ruiz, V. Margerin, Thomas Davinson, D. Howell, D. J. Mountford, Marialuisa Aliotta, and Oliver S. Kirsebom
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Physics ,Reaction rate ,Stars ,Wolf–Rayet star ,Hydrogen ,chemistry ,General Physics and Astronomy ,Resonance ,chemistry.chemical_element ,Asymptotic giant branch ,Emission spectrum ,Astrophysics ,Atmospheric temperature range - Abstract
In Wolf-Rayet and asymptotic giant branch (AGB) stars, the (26g)Al(p,γ)(27)Si reaction is expected to govern the destruction of the cosmic γ-ray emitting nucleus (26)Al. The rate of this reaction, however, is highly uncertain due to the unknown properties of key resonances in the temperature regime of hydrogen burning. We present a high-resolution inverse kinematic study of the (26g)Al(d,p)(27)Al reaction as a method for constraining the strengths of key astrophysical resonances in the (26g)Al(p,γ)(27)Si reaction. In particular, the results indicate that the resonance at E(r)=127 keV in (27)Si determines the entire (26g)Al(p,γ)(27)Si reaction rate over almost the complete temperature range of Wolf-Rayet stars and AGB stars.
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- 2015
16. Level structure ofS31: From low excitation energies to the region of interest for hydrogen burning in novae through theP30(p,γ)S31reaction
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P. J. Woods, D. T. Doherty, S. Zhu, H. M. David, D. Seweryniak, Gavin Lotay, M. P. Carpenter, L. Trache, R. V. F. Janssens, and C. J. Chiara
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Physics ,Reaction rate ,Nuclear and High Energy Physics ,Work (thermodynamics) ,Hydrogen ,chemistry ,Excited state ,chemistry.chemical_element ,Level structure ,Gammasphere ,Atomic physics ,Ejecta ,Excitation - Abstract
Comprehensive measurements of the excitation energy and spin-parity assignments for states in S31 are presented, from the first excited state, up to energies relevant for the P30(p,γ)S31 reaction in ONe novae. This reaction rate strongly influences heavy element abundances in novae ejecta. States in S31 are paired with their P31 analogues using γ rays detected with the Gammasphere detector array following the Si28(He4, n) fusion-evaporation reaction. The evolution of mirror energy differences is explored and the results are compared with new shell-model calculations. The excellent agreement observed in this work between experimental data and shell-model calculations provides confidence in using computed estimates in situations where experimental data are unavailable. © 2014 American Physical Society.
- Published
- 2014
17. Spectroscopy of proton-rich66Se up toJπ=6+: Isospin-breaking effect in theA=66isobaric triplet
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D. G. Jenkins, Juha Sorri, R. Julin, Panu Ruotsalainen, M. Leino, R. Wadsworth, J. Pakarinen, Pauli Peura, P. J. Davies, A. J. Nichols, Kalle Auranen, C. Scholey, Ulrika Jakobsson, T. Grahn, P. Rahkila, M. A. Bentley, J. Konki, Gavin Lotay, S. Juutinen, A. Herzáň, M. Sandzelius, Jack Henderson, Sanna Stolze, Juha Uusitalo, A. Obertelli, Jukka Partanen, Pankaj S. Joshi, Jan Sarén, and Paul Greenlees
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Physics ,Nuclear and High Energy Physics ,Angular momentum ,Proton ,010308 nuclear & particles physics ,7. Clean energy ,01 natural sciences ,Excited state ,Isospin ,0103 physical sciences ,Coulomb ,Isobaric process ,Triplet state ,Atomic physics ,010306 general physics ,Spectroscopy - Abstract
Candidates for three excited states in the 66^Se have been identified using the recoil-{\beta} tagging method together with a veto detector for charged-particle evaporation channels. These results allow a comparison of mirror and triplet energy differences between analogue states across the A = 66 triplet as a function of angular momentum. The extracted triplet energy differences follow the negative trend observed in the f_7/2 shell. Shell-model calculations indicate a continued need for an additional isospin non-conserving interaction in addition to the Coulomb isotensor part as a function of mass.
- Published
- 2013
18. Publisher's Note: Level structure of30S: Implications for the astrophysical29P(p,γ)30S reaction rate in ONe novae and x-ray bursts [Phys. Rev. C86, 042801(R) (2012)]
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D. T. Doherty, D. Seweryniak, Gavin Lotay, M. P. Carpenter, A. M. Rogers, C. J. Chiara, J. P. Wallace, R. V. F. Janssens, P. J. Woods, T. Lauritsen, and S. Zhu
- Subjects
Physics ,Nuclear physics ,Reaction rate ,Nuclear and High Energy Physics ,Radiative capture ,X-ray ,Level structure ,Thermodynamics - Published
- 2012
19. Level structure of30S: Implications for the astrophysical29P(p,γ)30S reaction rate in ONe novae and x-ray bursts
- Author
-
M. P. Carpenter, C. J. Chiara, T. Lauritsen, D. Seweryniak, Gavin Lotay, Philip Woods, S. Zhu, J. P. Wallace, R. V. F. Janssens, A. M. Rogers, and D. T. Doherty
- Subjects
Reaction rate ,Physics ,Nuclear and High Energy Physics ,Radiative capture ,X-ray ,Level structure ,Resonance ,Astrophysics ,Ejecta ,Spectroscopy ,Excitation - Abstract
A γ-ray spectroscopy study of 30S is presented. Excitation energies have been determined with improved precision over previous studies and firm spin-parity assignments have been made for key 29P+p resonant states. An evaluation of the 29P(p,γ)30S reaction for T=0.08-2.5 GK shows that the 3 + and 2 + resonant states located at E r=289(3) and 410(3) keV, respectively, dominate the 29P(p,γ)30S reaction rate in ONe novae, while the 410-keV resonance is expected to govern the rate in x-ray burster environments. These new, precise resonance energy measurements and firm spin-parity assignments have significantly reduced uncertainties in the 29P(p,γ)30S reaction in ONe novae and x-ray bursts. In particular, the reaction rate is now specified precisely enough for calculations of isotopic abundances in ONe novae ejecta. © 2012 American Physical Society.
- Published
- 2012
20. Publisher’s Note: Measurement of theNe18(α,p0)Na21Reaction Cross Section in the Burning Energy Region for X-Ray Bursts [Phys. Rev. Lett.108, 242701 (2012)]
- Author
-
P. Salter, P. J. Woods, A. St. J. Murphy, Marialuisa Aliotta, P. Machule, P.L. Walden, B. R. Fulton, Chris Ruiz, T. Davinson, M. Taggart, H. Al Falou, N. Galinski, Gavin Lotay, S. Sjue, D. Howell, A. Chen, and Barry Davids
- Subjects
Nuclear physics ,Physics ,Cross section (physics) ,X-ray ,General Physics and Astronomy ,Atomic physics ,Energy (signal processing) - Published
- 2012
21. Key Resonances in theP30(p,γ)S31Gateway Reaction for the Production of Heavy Elements in ONe Novae
- Author
-
S. Zhu, D. T. Doherty, P. J. Woods, M. P. Carpenter, R. V. F. Janssens, C. J. Chiara, Livius Trache, H. M. David, D. Seweryniak, and Gavin Lotay
- Subjects
Nuclear physics ,Reaction rate ,Physics ,Spins ,Astrophysics::High Energy Astrophysical Phenomena ,General Physics and Astronomy ,Parity (physics) ,Atomic physics ,Ejecta - Abstract
Material emitted as ejecta from ONe novae outbursts is observed to be rich in elements as heavy as Ca. The bottleneck for the synthesis of elements beyond sulphur is the (30)P(p,γ)(31)S reaction. Its reaction rate is, however, not well determined due to uncertainties in the properties of key resonances in the burning regime. In the present study, gamma-ray transitions are reported for the first time from all key states in (31)S relevant for the (30)P(p,γ)(31)S reaction. The spins and parity of these resonances have been deduced, and energies have been measured with the highest precision to date. The uncertainty in the estimated (30)P(p,γ)(31)S reaction rate has been drastically reduced. The rate using this new information is typically higher than previous estimates based on earlier experimental data, implying a higher flux of material processed to high-Z elements in novae, but it is in good agreement with predictions using the Hauser-Feshbach approach at higher burning temperatures.
- Published
- 2012
22. Measurement of theNe18(α,p0)Na21Reaction Cross Section in the Burning Energy Region for X-Ray Bursts
- Author
-
M. Taggart, S. Sjue, Barry Davids, B. R. Fulton, P. J. Woods, P. Machule, A. St. J. Murphy, Gavin Lotay, N. Galinski, H. Al Falou, T. Davinson, D. Howell, Marialuisa Aliotta, P.L. Walden, A. Chen, P. Salter, and Chris Ruiz
- Subjects
Physics ,Cross section (physics) ,X-ray ,General Physics and Astronomy ,rp-process ,Atomic physics ,Energy (signal processing) - Abstract
The 18Ne(α,p) 21Na reaction provides one of the main HCNO-breakout routes into the rp process in x-ray bursts. The 18Ne(α,p0) 21Na reaction cross section has been determined for the first time in the Gamow energy region for peak temperatures T∼2 GK by measuring its time-reversal reaction 21Na(p,α) 18Ne in inverse kinematics. The astrophysical rate for ground-state to ground-state transitions was found to be a factor of 2 lower than Hauser-Feshbach theoretical predictions. Our reduced rate will affect the physical conditions under which breakout from the HCNO cycles occurs via the 18Ne(α,p) 21Na reaction.
- Published
- 2012
23. Publisher's Note: Identification of analog states in theT=1/2A=27mirror system from low excitation energies to the region of hydrogen burning in the26Alg,m(p,γ)27Si reactions [Phys. Rev. C84, 035802 (2011)]
- Author
-
P. J. Woods, M. P. Carpenter, R. V. F. Janssens, H. M. David, S. Zhu, D. Seweryniak, and Gavin Lotay
- Subjects
Physics ,Nuclear and High Energy Physics ,Hydrogen ,chemistry ,chemistry.chemical_element ,Atomic physics ,Excitation - Published
- 2011
24. Identification of analog states in theT=1/2A=27mirror system from low excitation energies to the region of hydrogen burning in the26Alg,m(p,γ)27Si reactions
- Author
-
R. V. F. Janssens, P. J. Woods, D. Seweryniak, Gavin Lotay, H. M. David, S. Zhu, and M. P. Carpenter
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Presolar grains ,Carbon-12 ,Nuclear fusion ,Mirror nuclei ,Isotopes of silicon ,Atomic physics ,Ground state ,Oxygen-16 - Abstract
The reactions 26Alg(p,γ)27Si and 26Alm(p,γ)27Si are important for influencing the galactic abundance of the cosmic γ-ray emitter 26Alg and for the excess abundance of 26Mg found in presolar grains, respectively. Precise excitation energies and spin assignments of states from the ground state to the region of astrophysical interest in 27Si, including the identification and pairing of key astrophysical resonances with analog states in the mirror nucleus 27Al, are reported using γ rays observed in the 12C + 16O fusion reaction. The detailed evolution of Coulomb energy differences between the states in 27Si and 27Al is explored, including the region above the astrophysical reaction thresholds. © 2011 American Physical Society.
- Published
- 2011
25. Erratum:γ-ray spectroscopy study of states inSi27relevant for theAl26m(p,γ)Si27reaction in novae and supernovae [Phys. Rev. C80, 055802 (2009)]
- Author
-
P. J. Woods, S. Zhu, D. Seweryniak, Gavin Lotay, M. P. Carpenter, and R. V. F. Janssens
- Subjects
Nuclear physics ,Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Supernova ,Gamma ray ,Gamma spectroscopy ,Isotopes of silicon ,Variable star ,Spectroscopy ,Radioactive decay - Published
- 2010
26. γ-ray spectroscopy study of states inSi27relevant for theAl26m(p,γ)Si27reaction in novae and supernovae
- Author
-
S. Zhu, M. P. Carpenter, P. J. Woods, R. V. F. Janssens, D. Seweryniak, and Gavin Lotay
- Subjects
Nuclear physics ,Physics ,Reaction rate ,Nuclear and High Energy Physics ,Proton ,Excited state ,Gamma ray ,Resonance ,Spectroscopy ,P system ,Oxygen-16 - Abstract
The heavy-ion, fusion-evaporation reaction C12(O16,n) was used to identify γ-decay transitions from excited states in Si27 above the proton threshold. The precise level energy measurements, Jπ assignments, and lifetime measurements of astrophysically important Al26m+p resonances have allowed an evaluation of the Al26m(p,γ)Si27 reaction rate. An lp=0 resonance has been newly identified at a center-of-mass energy in the Al26m+p system of 146.3(3) keV and is expected to dominate the rate for low stellar temperatures. In addition, an lp=1 resonance has been identified at 378.3(30) keV and is likely to dominate the rate at high astrophysical temperatures, such as those found in oxygen-neon novae and core-collapse supernovae. © 2009 The American Physical Society.
- Published
- 2009
27. Identification of Key Astrophysical Resonances Relevant for theAl26g(p,γ)Si27Reaction in Wolf-Rayet Stars, AGB stars, and Classical Novae
- Author
-
Philip Woods, D. Seweryniak, Gavin Lotay, R. V. F. Janssens, S. Zhu, and M. P. Carpenter
- Subjects
Physics ,Proton ,General Physics and Astronomy ,Astronomy ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Stars ,Wolf–Rayet star ,Excited state ,Astrophysics::Solar and Stellar Astrophysics ,Asymptotic giant branch ,Gamma spectroscopy ,Spectroscopy ,Astrophysics::Galaxy Astrophysics ,Excitation - Abstract
A gamma-ray spectroscopy study of ;{26g}Al+p resonant states in 27Si is presented. Excitation energies were measured with improved precision and first spin-parity assignments made for excited states in 27Si above the proton threshold. The results indicate the presence of low-lying resonances with l_{p}=0 and l_{p}=2 captures that could strongly influence the ;{26g}Al(p,gamma)27Si reaction rate at low stellar temperatures, found in low-mass asymptotic giant branch (AGB), intermediate-mass AGB, super AGB, and Wolf-Rayet stars.
- Published
- 2009
28. First in-beam γ-ray spectroscopy study ofAl24and its implications for the astrophysicalMg23(p,γ)Al24reaction rate in ONe novae
- Author
-
P. J. Woods, T. Lauritsen, M. P. Carpenter, D. Seweryniak, Gavin Lotay, R. V. F. Janssens, N. Hoteling, C. J. Lister, S. Zhu, D. G. Jenkins, and A. Robinson
- Subjects
Physics ,Nuclear reaction ,Nuclear physics ,Reaction rate ,Nuclear and High Energy Physics ,Proton ,Excited state ,Gamma ray ,Resonance ,Gamma spectroscopy ,Atomic physics ,Spectroscopy - Abstract
The first in-beam γ-ray spectroscopy study of Al24 is presented. A complete level structure of Al24 incorporating all states below the proton-emission threshold, has been constructed. The first excited state above the proton threshold has also been identified as a 3+ state at 2345.1 ± 1.4 keV. This state, corresponding to a resonance energy of 473 ± 3 keV, has been suggested to be the dominant resonance contributing to the Mg23(p,γ)Al24 stellar reaction rate. The improved precision of the level energy and unambiguous assignment of the state has reduced the uncertainty of the Mg23(p,γ)Al24 stellar reaction rate, which constrains the production of A>20 nuclei in ONe novae. © 2008 The American Physical Society.
- Published
- 2008
29. Single-Neutron States inSn101
- Author
-
D. Peterson, C. J. Lister, D. Seweryniak, Gavin Lotay, P. J. Woods, T. L. Khoo, T. Lauritsen, R. V. F. Janssens, S. Gros, S. Zhu, A. Robinson, N. Hoteling, Xuan Wang, William B. Walters, M. P. Carpenter, and A. A. Hecht
- Subjects
Physics ,Isotope ,Astrophysics::High Energy Astrophysical Phenomena ,Fermi level ,Nuclear structure ,General Physics and Astronomy ,Beta decay ,symbols.namesake ,Atomic orbital ,Excited state ,symbols ,Neutron ,Atomic physics ,Spectroscopy - Abstract
The first data on the relative single-particle energies outside the doubly magic (100)Sn nucleus were obtained. A prompt 171.7(6) keV gamma-ray transition was correlated with protons emitted following the beta decay of (101)Sn and is interpreted as the transition between the single-neutron g(7/2) and d(5/2) orbitals in (101)Sn. This observation provides a stringent test of current nuclear structure models. The measured nug(7/2)-nud(5/2) energy splitting is compared with values calculated using mean-field nuclear potentials and is used to calculate low-energy excited states in light Sn isotopes in the framework of the shell model. The correlation technique used in this work offers possibilities for future, more extensive spectroscopy near (100)Sn.
- Published
- 2007
30. α decay ofTe105
- Author
-
D. Peterson, S. Zhu, D. Seweryniak, Gavin Lotay, Alexander Robinson, P. J. Woods, S. Gros, T. L. Khoo, Karin Lagergren, W. B. Walters, N. Hoteling, K. Starosta, C. N. Davids, A. A. Hecht, and C. Vaman
- Subjects
Physics ,Nuclear and High Energy Physics ,Isotope ,Q value ,Mass analyzer ,Analytical chemistry ,Half-life ,Alpha decay ,Nuclide - Abstract
The {alpha} decay of the neutron-deficient nuclide {sup 105}Te was observed. The {sup 50}Cr({sup 58}Ni,3n) reaction was used to produce {sup 105}Te nuclei. The {sup 105}Te residues were selected with the Argonne Fragment Mass Analyzer and implanted into a double-sided Si strip detector where their subsequent {alpha} decay was detected. An {alpha}-decay Q value of Q{sub {alpha}}=4900(50) keV and a half life of T{sub 1/2}=0.70(-0.17+0.25){mu}s were measured for {sup 105}Te and a reduced {alpha}-decay width of W{sub {alpha}}=3.3(-1.7+2.1) was deduced. The decay properties of {sup 105}Te are compared with those of heavier Te isotopes and theoretical predictions.
- Published
- 2006
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