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Nuclear electromagnetic moments provide key information for a deeper understanding of nuclear structure. Magnetic dipole moments are highly sensitive to the single-particle configurations of nuclei, while electric quadrupole moments are fingerprints of the nuclear deformation. Furthermore, reliable determination of spin and parity assignments is essential for interpreting nuclear structure....
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The Aluminium Superconducting Grid Array for Radiation Detection (ASGARD) anticipates to perform world-first precision spectroscopy of recoiling nuclei following short-lived beta decays. It will do this using novel superconducting tunnel junction detectors operated inside a windowless dilution refrigerator that can be coupled to a room temperature beam line. As part of the first measurements,...
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β-decay study of neutron deficient transitional Pt and Ir isotopes using (NA)2STARS
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The study of the beta-delayed two-proton (β–2p) emission is an important tool to obtain direct information about the structure of proton-rich nuclei. This exotic decay can be either a sequential emission via an intermediate state or a simultaneous emission of the two protons. Up to now, the 2p direct branch has never been evidenced. Recently, a silicon cube, a high-efficiency charged-particle...
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Abstract:
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The discovery of β-delayed neutron emission is almost as old as that of nuclear fission itself. In 1939, Roberts et al. [1] reported neutron emission persisting for more than a minute after the end of irradiation of a bottle containing roughly 100 g of uranium nitride. It was later recognized that this process plays a pivotal role both in nucleosynthesis, in particular the... -
The ground-state properties of atomic nuclei reflect the delicate balance between the repulsive force of the Coulomb interaction and the stabilizing force of nuclear interactions, including shell and pairing effects. Some of these properties, such as nuclear spin and electromagnetic moments, are accessible for optical spectroscopy in high-resolution mode. However, many exotic radionuclides of...
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The installation of the HINA (Highly Charged Ions for Nuclear Physics and Astrophysics) project and the related Electron Beam Ion Trap (EBIT) will represent a unique opportunity to access spectroscopy studies on highly charged ions. Our aim at the DESIR facility is to combine the availability of highly charged ions (HCIs) with the existing collinear laser spectroscopy (CLS) setup,...
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The HINA project (Highly Charged Ions for Nuclear Physics and Astrophysics) aims to develop in-trap decay spectroscopy of highly charged radioactive ions as a new experimental approach for nuclear physics and astrophysics studies. The method relies on storing HCIs in an electron-beam ion trap (EBIT) and observing their decay under well-defined atomic conditions, enabling studies of nuclear...
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Constraining key reaction rates for Supernovae and Neutron Stars with Total Absorption Gamma-ray Spectroscopy with the new STARS array
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Constraining key reaction rates of the rp-process with Total Absorption Gamma-ray Spectroscopy with the new STARS array
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GT beta-decay to 1- states in 38- and 40-S can take place if the GS spin of the parent nuclei is 2-. This is why
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the present proposal should be considered with the one concerning the measurements of GS spins with LASAGNE.
The Q-beta window for the decay of 38- and 40-P is 12.2 and 14.7 MeV, respectively, well above the neutron emission
threshold (Q-beta-n of 4.2 and 7 MeV, respectively).... -
The commissioning of the DESIR hall, equipped at its entrance with world-class beam purification and radioactive-ion preparation devices, opens outstanding opportunities for low-energy, trap-based, laser-based, and β-delayed studies. However, the full scientific potential of DESIR, commensurate with the efforts invested in its realization, will remain constrained over the coming decade by an...
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Improved beta-proton spectroscopy of 27P. Application to the Al26(p,g)Si27 reaction (astrophysical motivation)
Beam intensity > 10 pps
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Tape station + charged particle detection
gamma detection -
In-trap decay spectroscopy of highly charged ions (HCIs) is the main objective of the HINA (Highly Charged Ions for Nuclear Physics and Astrophysics) project, which aims to exploit a dedicated setup combining an Electron Beam Ion Trap (EBIT) and an electrostatic trap to produce, confine, and study the decay of HCIs. In such systems, where only a few bound electrons remain, electron-capture...
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The neutron-deficient region below the heaviest doubly-magic N=Z nucleus 100Sn provides a rich and important testing ground for nuclear structure effects, from shell closures and the evolution of deformation and single-particle behaviour moving away from them, to neutron-proton pairing around the N=Z line. It has thus attracted significant interest in recent years, with measurements of several...
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Abstract:
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Nuclear physics provides one of the most precise probes to test the electroweak interaction [Har20]. The procedure is based on the study of super-allowed Fermi beta decays, and requires high-precision determination of the half-life of the decay, the Q value and the branching ratio of the 0+ to 0+ transition (in the case of T=1 analog decays). The method relays on the validity of... -
Two reactions important for the CNO cycle break-out to rapid proton capture process in type I x-ray can profit from the
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measurement of beta-delayed particle emission from GS of 20-Mg : 15-O(a,g)19-Ne and 19-Ne(p, g)20-Na.
19-Ne(p, g)20-Na : the resonance at Er = 457keV (E* = 2647keV in 20Na) in the Gamow window is populated by beta decay of 20-
Mg. From previous measurements, upper limits... -
Letter of intent submitted from the MLLTRAP collaboration.
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The vicinity of ¹⁰⁰Sn is a rich landscape for studying nuclear isomers and exotic decay modes, including super-allowed α, βp, β2p, βα, and βpα emissions. This region is further characterized by enhanced neutron-proton pairing arising from its proximity to shell closure, making it an ideal testing ground for the nuclear shell model. In nuclear astrophysics, the rapid proton capture process...
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see attached
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see attached
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Nuclei in the region of $^{80}$Zr have long been thought to exhibit strong nuclear deformation, and rapid changes in nuclear shape happen in this region of the nuclear chart. From spherical at N = 50, nuclei become strongly deformed in the N ≤ 40 region. Until now, studies focus on Yrast states and the observation of deformed bands in neutron-deficient Sr nuclei. Another way of studying these...
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The study of shell evolution far from stability is a major focus of modern nuclear physics, such evolution is the cause of several interesting phenomena, one of which is shape coexistence. Shape coexistence can be characterized by the presence, in a narrow energy range, of several deformed nuclear configurations in the same nucleus. It is nowadays accepted that this phenomenon occurs almost in...
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Attached are 6 LOIs for LASAGN at DESIR. Among those, 3 are for "day one" experiments targeting available SPIRAL1 beams to be studied with LASAGN phase 1 : O, F and Cl. The 3 other (P, B and Br/Kr) would be requiering beam devellopments from SPIRAL1, S3 and TULIP and LASAGN phase 2 for some of the measurments.
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Abstract:
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Since the beginning of this decade, investigation near the proton dripline has regained interest thanks to the recent advancements in terms of neutron deficient radioactive ion beam production and continuous development of low energy apparatus dedicated to high-precision measurements. Among them, Penning-trap mass spectrometers offer a way to experimentally determine the exact... -
Nuclei beyond iron are mostly produced by neutron-capture processes (s-process and r-process). However, around 35 rare but stable nuclei, from 74Se to 196Hg, need another production mechanism, since they are situated on the neutron-deficient side of the stability valley. These are called p-nuclei. The main scenario for their production is photodisintegration of heavy, neutron-rich seed nuclei,...
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Online text: Nuclear moments of excited states are proposed to be measured with the DESIR facility, on light to heavy neutron-deficient isotopes with SPIRAL1 and S3-LEB beams. Experiments may be performed after beam bunching using e.g. GPIB, purification and/or e.g. MR-TOF-MS device and employment of both IPAC and TDPAC techniques using an adapted gSPEC device in standalone mode, or in...
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Radioactive molecules have emerged as precision probes for the violation of fundamental symmetries. Those containing actinides produced at S3 possibly offer an unprecedented sensitivity to parity and time-reversal violation. The ambient temperature of molecules interacting with a laser beam, however, masks any sensitivity to fundamental symmetries. Making use of the Reglis gas cell at the S3...
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Considering that isospin is a good symmetry, broken mainly by electromagnetic effects, E. P. Wigner introduced the isobaric mass multiplet equation (IMME) to describe how the masses of isobaric analog states (IAS) of a given multiplet vary with isospin projection (i.e. difference between proton and neutron numbers). For a set of IAS with the same mass number A, total isospin T, but different...
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The mass of the heaviest 𝑁=𝑍 doubly-magic nuclide, 100Sn, has never been directly measured so far. This iconic nucleus, along with its neighbouring nuclei, presents an enormous challenge for nuclear models, particularly in understanding shell closure evolution, isospin symmetry breaking and proton- neutron pairing. Additionally, 𝑁=𝑍 nuclides manifest an enhanced binding energy (known as the...
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Studying the evolution of shell closures approaching the drip-lines is a powerful way to probe nuclear forces and refine the theoretical description of nuclear structure. The particular case of the spin-orbit 𝑁=28 magic number has been intensively investigated in various types of experiments. It has been suggested that the loss of magicity below 48Ca arises from a subtle interplay between...
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Letters of intent submitted for the MLLTRAP collaboration
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In attached document
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The study of octupole deformation in atomic nuclei provides crucial insight into nuclear structure at the limits of stability. While the octupole deformation region centered at Z~88, N~136 has been well established experimentally, the question of its extent remains open, especially at higher Z. Experimental measurements in this region would help establish the boundaries of octupole...
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Cluster radioactivity can be understood as a phenomenon between alpha decay and fission, a kind of very asymmetric fission. This radioactivity has been observed for the first time in the 1980s in the decay of 223Ra [1]. Since then cluster emission in more than 20 heavy nuclei has been experimentally evidenced [2]. However, all these cases have daughter nuclei in the close vicinity of...
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Abstract:
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Beta decay correlation coefficients and the beta spectrum shape are 2 powerful observables to constrain the existence of Physics beyond the Standard Model of particles in the weak sector.
New constraints on deviations from the standard expected value of the angular correlation coefficient are currently being set at WISArD, ISOLDE, with a precision of 0.1-0.2% that will allow us... -
The region of neutron-deficient isotopes around the N = 50 shell-closure is a region where several very interesting nuclear structure phenomena occur. For example, a large number of high-spin, β-decaying isomers develop at high energy in the region south-west of $^{100}$Sn, due to the large overlap between protons and neutron holes in the g$_{9/2}$ orbital. A summary of already observed...
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The isotope 94Ag has three long-lived states [1,2,3,4]: the ground state (T1/2 = 26 ms), a first long-lived (7+) isomer (T1/2 = 550 ms, E = 1350(400) keV), and second long-lived (21+) isomer (T1/2 = 400 ms, E = 7-8 MeV). The (21+) isomer is of particular interest, because it is said to decay by (i) beta-decay and a long gamma-ray cascade [1], (ii) beta-p decay (BR ≈ 20%) [2], (iii) direct...
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Study of the $\beta$-decay of $T_z=-1$ nuclei for nuclear structure and astrophysics and to test the CVC hypothesis
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We propose to measure the $\beta$-decay of the $T_z=-1$ member of the $T=1$ triplets, in particular the $T_z=-1$ nuclei $^{42}$Ti, $^{46}$Cr, $^{50}$Fe and $^{54}$Ni, using the Total Absorption Gamma-ray Spectroscopy (TAGS) technique. These measurements are of profound... -
Abstract: In this Letter of Intent we would like to study the beta-decay and beta-delayed proton emission in Cd(Z = 48, N = 49,50,51) and In(Z = 49, N = 52,53) isotopes. The measurements include the decay gamma rays by both high resolution spectroscopy (HRS) and total absorption spectroscopy (TAS). With these measurements, the properties of the excited states in the daughter and the...
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Why are we living in a world made of matter? The “Matter’s Origin from RadioActivity” (MORA) experiment [1] is looking for answers. CP violation is one of the three famous Sakharov conditions needed for explaining the matter – antimatter imbalance observed in the Universe [2]. The measurement of the CP violating D correlation in the beta decay of trapped and laser polarized 23Mg+ and 39Ca+...
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Details in attached document
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The study of the beta decay of 100Sn can be considered a flagship experiment of fragmentation facilities of new generation. The reasons are clear. The production of this isotope is very challenging, requiring very high primary beam intensities and the related physics is very interesting. On one hand, 100Sn is the last accessible N=Z double magic nucleus that is stable from the perspective of...
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Total Absorption Gamma-ray Spectroscopy of waiting points of the rp-process of nucleosynthesis with the new STARS array
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Letter of intent submitted from the LASAGN and MLLTRAP collaborations.
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The $^{78}$Ni region is of particular interest to better understand shell-evolution far from stability and shape coexistence phenomena occurring in the N = 40 region appear to extend to the N = 50 region [1]. Even though the N = 50 shell-closure seems to be rather robust far from stability, several observations of intruder configurations at low energy seem to indicate otherwise. First hints of...
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In the last two decades, there have been significant advances in the laser spectroscopy of neutron-deficient nuclides around the lead isotopic chain (a recent view of the extent of the gathered data can be found in [1]). These measurements have revealed a rich and quickly shifting landscape, with the charge radii exhibiting sudden jumps and oscillations with the variation of neutron number as...
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