Search

Your search keyword '"Mauss B"' showing total 34 results
Start Over Author "Mauss B"
34 results on '"Mauss B"'

1. Prompt fission neutron spectra in the 235U(n,f) reaction

Author

Mauss B., Taïeb J., Laurent B., Bélier G., Chatillon A., Étasse D., Morfouace P., Roig O., Devlin M., Gomez J.A., Haight R. C., Kelly K. J., O’Donnell J.M., and Schmitt K.T.

Subjects
Physics, QC1-999
Abstract

Prompt fission neutron spectra (PFNS) are crucial to any neutronic simulation of critical nuclear systems. An experimental setup dedicated to the measurements of PFNS of very high accuracy was developed at the Los Alamos Neutron Science Center (LANSCE) some ten years ago. It allows for the measurement of PFNS for neutron induced fission at the Weapon Neutron Research (WNR) neutron source of the LANSCE. A measurement of the PFNS from the 235U(n,f) reaction was realized recently and is currently analyzed. Preliminary results are presented here and are compared to present nuclear data evaluations.

Published
2023
Full Text
View/download PDF

2. Isospin symmetry in the $T = 1, A = 62$ triplet

Author

Wimmer, K., Ruotsalainen, P., Lenzi, S. M., Poves, A., Hüyük, T., Browne, F., Doornenbal, P., Koiwai, T., Arici, T., Auranen, K., Bentley, M. A., Cortés, M. L., Delafosse, C., Eronen, T., Ge, Z., Grahn, T., Greenlees, P. T., Illana, A., Imai, N., Joukainen, H., Julin, R., Jungclaus, A., Jutila, H., Kankainen, A., Kitamura, N., Longfellow, B., Louko, J., Lozeva, R., Luoma, M., Mauss, B., Napoli, D. R., Niikura, M., Ojala, J., Pakarinen, J., Pereira-Lopez, X., Rahkila, P., Recchia, F., Sandzelius, M., Sarén, J., Taniuchi, R., Tann, H., Uthayakumaar, S., Uusitalo, J., Vaquero, V., Wadsworth, R., Zimba, G., and Yajzey, R.

Subjects
Nuclear Experiment
Abstract

Excited states in the $T_z = 0, -1$ nuclei $^{62}$Ga and $^{62}$Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident \grays were measured with the DALI2$^+$ array and uniquely assigned to the $A=62$ isobars. In addition, $^{62}$Ge was also studied independently at JYFL-ACCLAB using the ${}^{24}$Mg(${}^{40}$Ca,$2n$)${}^{62}$Ge fusion-evaporation reaction. The first excited $T=1, J^\pi =2^+$ states in $^{62}$Ga and $^{62}$Ge were identified at $979(1)$ and $965(1)$~keV, respectively, resolving discrepant interpretations in the literature. States beyond the first $2^+$ state in $^{62}$Ge were also identified for the first time in the present work. The results are compared with shell-model calculations in the $fp$ model space. Mirror and triplet energy differences are analyzed in terms of individual charge-symmetry and charge-independence breaking contributions. The MED results confirm the shrinkage of the $p$-orbits' radii when they are occupied by at least one nucleon on average., Comment: aceepted Phys. Lett. B

Published
2023

3. N=16 magicity revealed at the proton drip-line through the study of 35Ca

Author

Lalanne, L., Sorlin, O., Poves, A., Assié, M., Hammache, F., Koyama, S., Suzuki, D., Flavigny, F., Girard-Alcindor, V., Lemasson, A., Matta, A., Roger, T., Beaumel, D., Blumenfeld, Y, Brown, B. A., Santos, F. De Oliveira, Delaunay, F., de Séréville, N., Franchoo, S., Gibelin, J., Guillot, J., Kamalou, O., Kitamura, N., Lapoux, V., Mauss, B., Morfouace, P., Pancin, J., Saito, T. Y., Stodel, C., and Thomas, J-C.

Subjects
Nuclear Experiment
Abstract

The last proton bound calcium isotope $^{35}$Ca has been studied for the first time, using the $^{37}$Ca($p, t$)$^{35}$Ca two neutron transfer reaction. The radioactive $^{37}$Ca nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce tritons $t$ that were detected in the MUST2 detector array, in coincidence with the heavy residues Ca or Ar. The atomic mass of $^{35}$Ca and the energy of its first 3/2$^+$ state are reported. A large $N=16$ gap of 4.61(11) MeV is deduced from the mass measurement, which together with other measured properties, makes $^{36}$Ca a doubly-magic nucleus. The $N = 16$ shell gaps in $^{36}$Ca and $^{24}$O are of similar amplitude, at both edges of the valley of stability. This feature is discussed in terms of nuclear forces involved, within state-of-the-art shell model calculations. Even though the global agreement with data is quite convincing, the calculations underestimate the size of the $N = 16$ gap in 36Ca by 840(110) keV.

Published
2023

4. MICROMEGAS calibration for ACTAR TPC

Author

Mauss B., Roger T., Pancin J., Damoy S., and Grinyer G. F.

Subjects
Physics, QC1-999
Abstract

Active targets, such as the ACtive TARget and Time Projection Chamber (ACTAR TPC) being developed at GANIL, are detection systems that operate on the basis of a time projection chamber but where the filling gas also serves as a thick target for nuclear reactions. In nuclear physics experiments, the energy resolution is of primary importance to identify the reaction products and to precisely reconstruct level schemes of nuclei. These measurements are based on the energy deposited on a pixelated pad plane. A MICROMEGAS detector is used in ACTAR TPC for the ionization electron collection and amplification, and it is a major contributor to the energy dispersion through, for example, inhomogeneities of the amplification gap. A variation of one percent in the gap can lead to an amplitude variation of more than two percent which is of the same order as the resolution obtained with an energy deposition of 5 MeV. One way to calibrate the pad plane is through the use of a two dimensional source scanning table. It is used to calibrate the gain inhomogeneities and, using MAGBOLTZ calculations, deduce the corresponding gap variations. The inverse of this method would allow the relative gain variations to be calculated for the different gas mixtures and pressures used in experiments with ACTAR TPC.

Published
2018
Full Text
View/download PDF

5. The structure of $^{36}$Ca under the Coulomb magnifying glass

Author

Lalanne, L., Sorlin, O., Poves, A., Assié, M., Hammache, F., Koyama, S., Flavigny, F., Girard-Alcindor, V., Lemasson, A., Matta, A., Roger, T., Beaumel, D., Blumenfeld, Y, Brown, B. A., Santos, F. De Oliveira, Delaunay, F., de Séréville, N., Franchoo, S., Gibelin, J., Guillot, J., Kamalou, O., Kitamura, N., Lapoux, V., Mauss, B., Morfouace, P., Niikura, M., Pancin, J., Saito, T. Y., Suzuki, D., Stodel, C., and Thomas, J-C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Detailed spectroscopy of the neutron-deficient nucleus $^{36}$Ca was obtained up to 9 MeV using the $^{37}$Ca($p$,$d$)$^{36}$Ca and the $^{38}$Ca($p$,$t$)$^{36}$Ca transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid Hydrogen target CRYPTA, to produce light ejectiles (the deuteron $d$ or triton $t$) that were detected in the MUST2 detector array, in coincidence with the heavy residues %identified by a zero degree detection system. %States have been measured up to 9 MeV. Our main findings are: i) a similar shift in energy for the 1$^+_1$ and 2$^+_1$ states by about -250 keV, as compared to the mirror nucleus $^{36}$S, ii) the discovery of an intruder 0$^+_2$ state at 2.83(13) MeV, which appears below the first 2$^+$ state, in contradiction with the situation in $^{36}$S, and iii) a tentative 0$^+_3$ state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s$_{1/2}$ orbit. The inversion between the 0$^+_2$ and 2$^+_1$ states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by Shell Model (SM) calculations, using the $sd$-$pf$ valence space, predicting an almost pure intruder nature for the 0$^+_2$ state, with two protons (neutrons) being excited across the $Z$=20 magic closure in $^{36}$Ca ($^{36}$S). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum., Comment: Paper of 5 pages, 3 figures. Contains also a supplementary material of 3 pages and 4 figures

Published
2022
Full Text
View/download PDF

6. Evaluation of the $^{35}$K($p$,$\gamma$)$^{36}$Ca reaction rate using the $^{37}$Ca($p$,$d$)$^{36}$Ca transfer reaction

Author

Lalanne, L., Sorlin, O., Assié, M., Hammache, F., de Séréville, N., Koyama, S., Suzuki, D., Flavigny, F., Beaumel, D., Blumenfeld, Y, Brown, B. A., Santos, F. De Oliveira, Delaunay, F., Franchoo, S., Gibelin, J., Girard-Alcindor, V., Guillot, J., Kamalou, O., Kitamura, N., Lapoux, V., Lemasson, A., Matta, A., Mauss, B., Morfouace, P., Niikura, M., Pancin, J., Poves, A., Roger, T., Saito, T., Stodel, C., and Thomas, J-C.

Subjects
Nuclear Experiment
Abstract

A recent sensitivity study has shown that the $^{35}$K$(p,\gamma)^{36}$Ca reaction is one of the ten $(p,\gamma)$ reaction rates that could significantly impact the shape of the calculated X-ray burst light curve. In this work, we propose to reinvestigate the $^{35}$K$(p,\gamma)^{36}$Ca reaction rate, as well as related uncertainties, by determining the energies and decay branching ratios of $^{36}$Ca levels, within the Gamow window, in the 0.5 to 2 GK X-ray burst temperature range. These properties were studied using the one neutron pick-up transfer reaction $^{37}$Ca$(p,d)^{36}$Ca in inverse kinematics using a radioactive beam of $^{37}$Ca at 48 MeV nucleon$^{-1}$. The experiment performed at GANIL, used the liquid Hydrogen target CRYPTA, the MUST2 detector array for the detection of the light charged particles and a zero degree detection system for the outgoing heavy ions. The atomic mass of $^{36}$Ca is confirmed and new resonances have been proposed together with their proton decay branching ratios. This spectroscopic information, used in combination with recent theoretical predictions for the $\gamma$-width, were used to calculate the $^{35}$K$(p,\gamma)^{36}$Ca reaction rate. The recommended rate of the present work was obtain within a uncertainty factor of 2 at 1 sigma. This is consistent, with the previous estimate in the X-ray burst temperature range. A large increase of the reaction rate was found at higher temperatures due to two newly discovered resonances. The $^{35}$K$(p,\gamma)^{36}$Ca thermonuclear reaction rate is now well constrained by the present work in a broad range of temperatures. Our results show that the $^{35}$K$(p,\gamma)^{36}$Ca reaction does not affect the shape of the X-ray burst light curve, and that it can be removed from the list of the few influential proton radiative captures reactions having a strong impact on the light curve., Comment: Published 13 May 2021 in PRC

Published
2021
Full Text
View/download PDF

7. Proton 3D tracking and emission time from a short-lived isomer with ACTAR TPC

Author

Giovinazzo, J., Roger, T., Blank, B., Rudolph, D., Alvarez-Pol, H., Arokiaraj, A., Ascher, P., Camaaño-Fresco, M., Caceres, L., Cox, D.M., Fernández-Domínguez, B., Lois-Fuentes, J., Gerbaux, M., Grévy, S., Grinyer, G.F., Kamalou, O., Mauss, B., Mentana, A., Ortega Moral, A., Pancin, J., Pibernat, J., Piot, J., Sorlin, O., Stodel, C., Thomas, J.-C., and Versteegen, M.

Published
2022
Full Text
View/download PDF

8. Author Correction: 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

Author

Giovinazzo, J., Roger, T., Blank, B., Rudolph, D., Brown, B. A., Alvarez-Pol, H., Arokia Raj, A., Ascher, P., Caamaño-Fresco, M., Caceres, L., Cox, D. M., Fernández-Domínguez, B., Lois-Fuentes, J., Gerbaux, M., Grévy, S., Grinyer, G. F., Kamalou, O., Mauss, B., Mentana, A., Pancin, J., Pibernat, J., Piot, J., Sorlin, O., Stodel, C., Thomas, J.-C., and Versteegen, M.

Published
2022
Full Text
View/download PDF

9. Mirror symmetry at far edges of stability: The cases of C8 and He8

Author

Koyama, S., primary, Suzuki, D., additional, Assié, M., additional, Lalanne, L., additional, Sorlin, O., additional, Abe, T., additional, Beaumel, D., additional, Blumenfeld, Y., additional, Caceres, L., additional, De Oliveira Santos, F., additional, Delaunay, F., additional, Flavigny, F., additional, Franchoo, S., additional, Gibelin, J., additional, Girard-Alcindor, V., additional, Guillot, J., additional, Hammache, F., additional, Kamalou, O., additional, Kamenyero, A., additional, Kitamura, N., additional, Lapoux, V., additional, Lemasson, A., additional, Matta, A., additional, Mauss, B., additional, Morfouace, P., additional, Niikura, M., additional, Otsu, H., additional, Pancin, J., additional, Roger, T., additional, Saito, T. Y., additional, Sakurai, H., additional, Stodel, C., additional, and Thomas, J-C., additional

Published
2024
Full Text
View/download PDF

10. 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

Author

Giovinazzo, J., Roger, T., Blank, B., Rudolph, D., Brown, B. A., Alvarez-Pol, H., Arokia Raj, A., Ascher, P., Caamaño-Fresco, M., Caceres, L., Cox, D. M., Fernández-Domínguez, B., Lois-Fuentes, J., Gerbaux, M., Grévy, S., Grinyer, G. F., Kamalou, O., Mauss, B., Mentana, A., Pancin, J., Pibernat, J., Piot, J., Sorlin, O., Stodel, C., Thomas, J.-C., and Versteegen, M.

Published
2021
Full Text
View/download PDF

11. Commissioning of the ACtive TARget and Time Projection Chamber (ACTAR TPC)

Author

Mauss, B., Morfouace, P., Roger, T., Pancin, J., Grinyer, G.F., Giovinazzo, J., Alcindor, V., Álvarez-Pol, H., Arokiaraj, A., Babo, M., Bastin, B., Borcea, C., Caamaño, M., Ceruti, S., Fernández-Domínguez, B., Foulon-Moret, E., Gangnant, P., Giraud, S., Laffoley, A., Mantovani, G., Marchi, T., Monteagudo, B., Pibernat, J., Poleshchuk, O., Raabe, R., Refsgaard, J., Revel, A., Saillant, F., Stanoiu, M., Wittwer, G., and Yang, J.

Published
2019
Full Text
View/download PDF

13. Isospin symmetry in the T = 1,A = 62 triplet

Author

Wimmer, K., primary, Ruotsalainen, P., additional, Lenzi, S.M., additional, Poves, A., additional, Hüyük, T., additional, Browne, F., additional, Doornenbal, P., additional, Koiwai, T., additional, Arici, T., additional, Auranen, K., additional, Bentley, M.A., additional, Cortés, M.L., additional, Delafosse, C., additional, Eronen, T., additional, Ge, Z., additional, Grahn, T., additional, Greenlees, P.T., additional, Illana, A., additional, Imai, N., additional, Joukainen, H., additional, Julin, R., additional, Jungclaus, A., additional, Jutila, H., additional, Kankainen, A., additional, Kitamura, N., additional, Longfellow, B., additional, Louko, J., additional, Lozeva, R., additional, Luoma, M., additional, Mauss, B., additional, Napoli, D.R., additional, Niikura, M., additional, Ojala, J., additional, Pakarinen, J., additional, Pereira-Lopez, X., additional, Rahkila, P., additional, Recchia, F., additional, Sandzelius, M., additional, Sarén, J., additional, Taniuchi, R., additional, Tann, H., additional, Uthayakumaar, S., additional, Uusitalo, J., additional, Vaquero, V., additional, Wadsworth, R., additional, Zimba, G., additional, and Yajzey, R., additional

Published
2023
Full Text
View/download PDF

14. Demonstrator Detection System for the Active Target and Time Projection Chamber (ACTAR TPC) project

Author

Roger, T., Pancin, J., Grinyer, G.F., Mauss, B., Laffoley, A.T., Rosier, P., Alvarez-Pol, H., Babo, M., Blank, B., Caamaño, M., Ceruti, S., Daemen, J., Damoy, S., Duclos, B., Fernández-Domínguez, B., Flavigny, F., Giovinazzo, J., Goigoux, T., Henares, J.L., Konczykowski, P., Marchi, T., Lebertre, G., Lecesne, N., Legeard, L., Maugeais, C., Minier, G., Osmond, B., Pedroza, J.L., Pibernat, J., Poleshchuk, O., Pollacco, E.C., Raabe, R., Raine, B., Renzi, F., Saillant, F., Sénécal, P., Sizun, P., Suzuki, D., Swartz, J.A., Wouters, C., Wittwer, G., and Yang, J.C.

Published
2018
Full Text
View/download PDF

16. Gamma-ray spectroscopy of exotic neutron-rich nuclei in the doubly magic 132Sn region

Author

Parry, T, primary, Armstrong, M, additional, Podolyák, Zs, additional, Górska, M, additional, Acosta, J, additional, Chen, Z Q, additional, Jungclaus, A, additional, Wimmer, K, additional, Doornenbal, P, additional, Aoi, N, additional, Baba, H, additional, Bartram, G, additional, Browne, F, additional, Campbell, C, additional, Crawford, H, additional, De Witte, H, additional, Fransen, C, additional, Hess, H, additional, Iwazaki, S, additional, Kim, J, additional, Kohda, A, additional, Koiwai, T, additional, Mauss, B, additional, Moon, B, additional, Reiter, P, additional, Suzuki, D, additional, Taniuchi, R, additional, Thiel, S, additional, Tostevin, J A, additional, Yamamoto, Y, additional, Yaneva, A, additional, and Yuan, C, additional

Published
2023
Full Text
View/download PDF

17. N=16 Magicity Revealed at the Proton Drip Line through the Study of Ca35

Author

Lalanne, L., primary, Sorlin, O., additional, Poves, A., additional, Assié, M., additional, Hammache, F., additional, Koyama, S., additional, Suzuki, D., additional, Flavigny, F., additional, Girard-Alcindor, V., additional, Lemasson, A., additional, Matta, A., additional, Roger, T., additional, Beaumel, D., additional, Blumenfeld, Y, additional, Brown, B. A., additional, Santos, F. De Oliveira, additional, Delaunay, F., additional, de Séréville, N., additional, Franchoo, S., additional, Gibelin, J., additional, Guillot, J., additional, Kamalou, O., additional, Kitamura, N., additional, Lapoux, V., additional, Mauss, B., additional, Morfouace, P., additional, Pancin, J., additional, Saito, T. Y., additional, Stodel, C., additional, and Thomas, J-C., additional

Published
2023
Full Text
View/download PDF

18. N=16 magicity revealed at the proton drip-line through the study of 35Ca

Author

Lalanne, L, Sorlin, O, Poves, A, Assié, M, Hammache, F, Koyama, S, Suzuki, D, Flavigny, F, Girard-Alcindor, V, Lemasson, A, Matta, A, Roger, T, Beaumel, D, Blumenfeld, Y, Brown, B.A, de Oliveira Santos, F, Delaunay, F, de Séréville, N, Franchoo, S, Gibelin, J, Guillot, J, Kamalou, O, Kitamura, N, Lapoux, V, Mauss, B, Morfouace, P, Pancin, J, Saito, T.Y, Stodel, C, Thomas, J-C, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

International audience; The last proton bound calcium isotope $^{35}$Ca has been studied for the first time, using the $^{37}$Ca($p, t$)$^{35}$Ca two neutron transfer reaction. The radioactive $^{37}$Ca nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce tritons $t$ that were detected in the MUST2 detector array, in coincidence with the heavy residues Ca or Ar. The atomic mass of $^{35}$Ca and the energy of its first 3/2$^+$ state are reported. A large $N=16$ gap of 4.61(11) MeV is deduced from the mass measurement, which together with other measured properties, makes $^{36}$Ca a doubly-magic nucleus. The $N = 16$ shell gaps in $^{36}$Ca and $^{24}$O are of similar amplitude, at both edges of the valley of stability. This feature is discussed in terms of nuclear forces involved, within state-of-the-art shell model calculations. Even though the global agreement with data is quite convincing, the calculations underestimate the size of the $N = 16$ gap in 36Ca by 840(110) keV.

Published
2023

19. Prompt fission neutron spectra in the 235U(n,f) reaction.

Author

Mauss, B., Taïeb, J., Laurent, B., Bélier, G., Chatillon, A., Étasse, D., Morfouace, P., Roig, O., Devlin, M., Gomez, J.A., Haight, R. C., Kelly, K. J., O'Donnell, J.M., and Schmitt, K.T.

Subjects
NEUTRON spectroscopy, NUCLEAR reactions, NUCLEAR fission, DATA analysis, URANIUM isotopes
Abstract

Prompt fission neutron spectra (PFNS) are crucial to any neutronic simulation of critical nuclear systems. An experimental setup dedicated to the measurements of PFNS of very high accuracy was developed at the Los Alamos Neutron Science Center (LANSCE) some ten years ago. It allows for the measurement of PFNS for neutron induced fission at the Weapon Neutron Research (WNR) neutron source of the LANSCE. A measurement of the PFNS from the 235U(n,f) reaction was realized recently and is currently analyzed. Preliminary results are presented here and are compared to present nuclear data evaluations. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

20. Structure of Ca36 under the Coulomb Magnifying Glass

Author

Lalanne, L., primary, Sorlin, O., additional, Poves, A., additional, Assié, M., additional, Hammache, F., additional, Koyama, S., additional, Suzuki, D., additional, Flavigny, F., additional, Girard-Alcindor, V., additional, Lemasson, A., additional, Matta, A., additional, Roger, T., additional, Beaumel, D., additional, Blumenfeld, Y., additional, Brown, B. A., additional, Santos, F. De Oliveira, additional, Delaunay, F., additional, de Séréville, N., additional, Franchoo, S., additional, Gibelin, J., additional, Guillot, J., additional, Kamalou, O., additional, Kitamura, N., additional, Lapoux, V., additional, Mauss, B., additional, Morfouace, P., additional, Niikura, M., additional, Pancin, J., additional, Saito, T. Y., additional, Stodel, C., additional, and Thomas, J-C., additional

Published
2022
Full Text
View/download PDF

21. Mirror symmetry at mass = 54: 4 Effective Charges Near Doubly Magic Ni

Author

Rudolph, D., Blank, B., Giovinazzo, J., Roger, T., Alvarez-Pol, H., Arokia Raj, A., Ascher, P., Caamaño-Fresco, M., Caceres, L., Cox, D.M., Fernández-Domínguez, B., Lois-Fuentes, J., Gerbaux, M., Grévy, S., Grinyer, G.F., Kamalou, O., Mauss, B., Mentana, A., Pancin, J., Pibernat, J., Piot, J., Sorlin, O., Stodel, C., Thomas, J.C., and Versteegen, M.

Abstract

Proton-emission branches of the 10+ isomer in the Tz=−1 nucleus $^{54}$Ni have been imaged with the active target and time projection chamber (ACTAR TPC) in an experiment conducted at the Grand Accélérateur National d'Ions Lourds (GANIL). The completed decay scheme allows derivation of the reduced transition strengths, B(E2;10+→8+) and B(E4;10+→6+), for the two competing γ-ray transitions. By means of a comparison with their well-known ‘mirror transitions’ in Tz=+1 $^{54}$Fe, and aided by a variety of shell-model calculations in the fp model space, effective charges for E4 transitions near N=Z $^{56}$Ni can be deduced: επ≈1.40 and εν≈0.30. Mirror-energy differences are explored with various shell-model interactions and isospin-symmetry breaking terms.

Published
2022

22. Mirror symmetry at mass A = 54: E4 effective charges near doubly magic 56Ni

Author

Rudolph, D., primary, Blank, B., additional, Giovinazzo, J., additional, Roger, T., additional, Alvarez-Pol, H., additional, Arokia Raj, A., additional, Ascher, P., additional, Caamaño-Fresco, M., additional, Caceres, L., additional, Cox, D.M., additional, Fernández-Domínguez, B., additional, Lois-Fuentes, J., additional, Gerbaux, M., additional, Grévy, S., additional, Grinyer, G.F., additional, Kamalou, O., additional, Mauss, B., additional, Mentana, A., additional, Pancin, J., additional, Pibernat, J., additional, Piot, J., additional, Sorlin, O., additional, Stodel, C., additional, Thomas, J.-C., additional, and Versteegen, M., additional

Published
2022
Full Text
View/download PDF

23. Structure of <math display='inline'><mrow><mmultiscripts><mrow><mi>Ca</mi></mrow><mprescripts/><none/><mrow><mn>36</mn></mrow></mmultiscripts></mrow></math> under the Coulomb Magnifying Glass

Author

Lalanne, L., Sorlin, O., Poves, A., Assié, M., Hammache, F., Koyama, S., Suzuki, D., Flavigny, F., Girard-Alcindor, V., Lemasson, A., Matta, A., Roger, T., Beaumel, D., Blumenfeld, Y., Brown, B.A., de Oliveira Santos, F., Delaunay, F., de Séréville, N., Franchoo, S., Gibelin, J., Guillot, J., Kamalou, O., Kitamura, N., Lapoux, V., Mauss, B., Morfouace, P., Niikura, M., Pancin, J., Saito, T.Y., Stodel, C., Thomas, J-C., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Detailed spectroscopy of the neutron-deficient nucleus Ca36 was obtained up to 9 MeV using the Ca37(p,d)Ca36 and the Ca38(p,t)Ca36 transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce light ejectiles (the deuteron d or triton t) that were detected in the MUST2 detector array, in coincidence with the heavy residues identified by a zero-degree detection system. Our main findings are (i) a similar shift in energy for the 11+ and 21+ states by about -250 keV, as compared with the mirror nucleus S36; (ii) the discovery of an intruder 02+ state at 2.83(13) MeV, which appears below the first 2+ state, in contradiction with the situation in S36; and (iii) a tentative 03+ state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s1/2 orbit. The inversion between the 02+ and 21+ states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by shell model calculations, using the sd-pf valence space, predicting an almost pure intruder nature for the 02+ state, with two protons (neutrons) being excited across the Z=20 magic closure in Ca36 (S36). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.

Published
2022
Full Text
View/download PDF

24. Mirror energy differences above the 0 shell: First -ray Spectroscopy of the = −2 Nucleus Zn

Author

Fernández, A., Jungclaus, A., Doornenbal, P., Bentley, M.A., Lenzi, S.M., Rudolph, D., Browne, F., Cortés, M.L., Koiwai, T., Taniuchi, R., Vaquero, V., Wimmer, K., Arici, T., Imai, N., Kitamura, N., Longfellow, B., Lozeva, R., Mauss, B., Napoli, D.R., Niikura, M., Pereira-Lopez, X., Pigliapoco, S., Poves, A., Recchia, F., Ruotsalainen, P., Sakurai, H., Uthayakumaar, S., Wadsworth, R., and Yajzey, R.

Abstract

Excited states in $^{56}$Zn were populated following one-neutron removal from a $^{57}$Zn beam impinging on a Be target at intermediate energies in an experiment conducted at the Radioactive Isotope Beam Factory at RIKEN. Three γ rays were observed and tentatively assigned to the 6+→4+→2+→0+ yrast sequence. This turns $^{56}$Zn into the heaviest Tz=−2 nucleus in which excited states are known. The excitation-energy differences between these levels and the isobaric analogue states in the Tz=+2 mirror partner, $^{56}$Fe, are compared with large-scale shell-model calculations considering the full pf valence space and various isospin-breaking contributions. This comparison, together with an analysis of the mirror energy differences in the A=58, Tz=±1 pair $^{58}$Zn and $^{58}$Ni, provides valuable information with respect to the size of the monopole radial and the isovector multipole isospin-breaking terms in the region above doubly-magic $^{56}$Ni.

Published
2021

25. Mirror energy differences above the 0f7/2 shell: First γ-ray spectroscopy of the T = −2 nucleus 56Zn

Author

Fernández, A., primary, Jungclaus, A., additional, Doornenbal, P., additional, Bentley, M.A., additional, Lenzi, S.M., additional, Rudolph, D., additional, Browne, F., additional, Cortés, M.L., additional, Koiwai, T., additional, Taniuchi, R., additional, Vaquero, V., additional, Wimmer, K., additional, Arici, T., additional, Imai, N., additional, Kitamura, N., additional, Longfellow, B., additional, Lozeva, R., additional, Mauss, B., additional, Napoli, D.R., additional, Niikura, M., additional, Pereira-Lopez, X., additional, Pigliapoco, S., additional, Poves, A., additional, Recchia, F., additional, Ruotsalainen, P., additional, Sakurai, H., additional, Uthayakumaar, S., additional, Wadsworth, R., additional, and Yajzey, R., additional

Published
2021
Full Text
View/download PDF

27. Evaluation of the K35(p,γ)Ca36 reaction rate using the Ca37(p,d)Ca36 transfer reaction

Author

Lalanne, L., primary, Sorlin, O., additional, Assié, M., additional, Hammache, F., additional, de Séréville, N., additional, Koyama, S., additional, Suzuki, D., additional, Flavigny, F., additional, Beaumel, D., additional, Blumenfeld, Y., additional, Brown, B. A., additional, Santos, F. De Oliveira, additional, Delaunay, F., additional, Franchoo, S., additional, Gibelin, J., additional, Girard-Alcindor, V., additional, Guillot, J., additional, Kamalou, O., additional, Kitamura, N., additional, Lapoux, V., additional, Lemasson, A., additional, Matta, A., additional, Mauss, B., additional, Morfouace, P., additional, Niikura, M., additional, Pancin, J., additional, Poves, A., additional, Roger, T., additional, Saito, T., additional, Stodel, C., additional, and Thomas, J-C., additional

Published
2021
Full Text
View/download PDF

28. 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC.

Author

Giovinazzo, J., Roger, T., Blank, B., Rudolph, D., Brown, B. A., Alvarez-Pol, H., Arokia Raj, A., Ascher, P., Caamaño-Fresco, M., Caceres, L., Cox, D. M., Fernández-Domínguez, B., Lois-Fuentes, J., Gerbaux, M., Grévy, S., Grinyer, G. F., Kamalou, O., Mauss, B., Mentana, A., and Pancin, J.

Subjects
RADIOACTIVE decay, ATOMIC nucleus, RADIOACTIVITY, NUCLEAR structure, PROTONS, MESOSCOPIC systems
Abstract

Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions. Proton radioactivity is useful for studying nuclear structure. Here the authors report two proton emission branches from the 10+ state isomer of 54mNi by using a time projection chamber. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

32. Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53m Co.

Author

Sarmiento LG, Roger T, Giovinazzo J, Brown BA, Blank B, Rudolph D, Kankainen A, Alvarez-Pol H, Raj AA, Ascher P, Block M, Caamaño-Fresco M, Caceres L, Canete L, Cox DM, Eronen T, Fahlander C, Fernández-Domínguez B, Forsberg U, Lois-Fuentes J, Gerbaux M, Gerl J, Golubev P, Grévy S, Grinyer GF, Habermann T, Hakala J, Jokinen A, Kamalou O, Kojouharov I, Kolhinen VS, Koponen J, Kurz N, Lalović N, Lorenz C, Mauss B, Mentana A, Moore ID, Ortega Moral A, Pancin J, Papadakis P, Pibernat J, Piot J, Pohjalainen I, Reinikainen J, Rinta-Antila S, Schaffner H, Sorlin O, Stodel C, Thomas JC, Versteegen M, and Voss A

Abstract

The observation of a weak proton-emission branch in the decay of the 3174-keV 53m Co isomeric state marked the discovery of proton radioactivity in atomic nuclei in 1970. Here we show, based on the partial half-lives and the decay energies of the possible proton-emission branches, that the exceptionally high angular momentum barriers, [Formula: see text] and [Formula: see text], play a key role in hindering the proton radioactivity from 53m Co, making them very challenging to observe and calculate. Indeed, experiments had to wait decades for significant advances in accelerator facilities and multi-faceted state-of-the-art decay stations to gain full access to all observables. Combining data taken with the TASISpec decay station at the Accelerator Laboratory of the University of Jyväskylä, Finland, and the ACTAR TPC device on LISE3 at GANIL, France, we measured their branching ratios as b p1 = 1.3(1)% and b p2 = 0.025(4)%. These results were compared to cutting-edge shell-model and barrier penetration calculations. This description reproduces the order of magnitude of the branching ratios and partial half-lives, despite their very small spectroscopic factors., (© 2023. Springer Nature Limited.)

Published
2023
Full Text
View/download PDF

33. N=16 Magicity Revealed at the Proton Drip Line through the Study of ^{35}Ca.

Author

Lalanne L, Sorlin O, Poves A, Assié M, Hammache F, Koyama S, Suzuki D, Flavigny F, Girard-Alcindor V, Lemasson A, Matta A, Roger T, Beaumel D, Blumenfeld Y, Brown BA, Santos FO, Delaunay F, de Séréville N, Franchoo S, Gibelin J, Guillot J, Kamalou O, Kitamura N, Lapoux V, Mauss B, Morfouace P, Pancin J, Saito TY, Stodel C, and Thomas JC

Abstract

The last proton bound calcium isotope ^{35}Ca has been studied for the first time, using the ^{37}Ca(p,t)^{35}Ca two neutron transfer reaction. The radioactive ^{37}Ca nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce tritons t that were detected in the MUST2 detector array, in coincidence with the heavy residues Ca or Ar. The atomic mass of ^{35}Ca and the energy of its first 3/2^{+} state are reported. A large N=16 gap of 4.61(11) MeV is deduced from the mass measurement, which together with other measured properties, makes ^{36}Ca a doubly magic nucleus. The N=16 shell gaps in ^{36}Ca and ^{24}O are of similar amplitude, at both edges of the valley of stability. This feature is discussed in terms of nuclear forces involved, within state-of-the-art shell model calculations. Even though the global agreement with data is quite convincing, the calculations underestimate the size of the N=16 gap in ^{36}Ca by 840 keV.

Published
2023
Full Text
View/download PDF

34. [Successful prevention of adhesions using peat and humic acids].

Author

Mesrogli M, Maas DH, Mauss B, Plogmann S, Ziechmann W, and Schneider J

Subjects
Animals, Female, Rats, Rats, Inbred Lew, Tissue Adhesions prevention & control, Humic Substances administration & dosage, Mud Therapy, Peritoneum surgery, Postoperative Complications prevention & control, Uterus surgery
Abstract

In order to verify the adhesion preventing capability of peat and peat components, 180 female rats were subjected to therapeutic bathing after standardised lesions had been placed on both uterine horns and the peritoneum of the anterior abdominal wall. From the 3rd and 7th day after surgery, respectively, randomized groups of animals consisting of 20 animals each were bathed in tap water, pure fresh peat, peat solution after pressing, centrifugation and filtration, and a solution of humic acids extracted from peat, all at the same temperature. One week after bathing for three weeks, the rats were relaparotomized, and quality and degree of the adhesions found were documented. Significant less and minor (p less than 0.001) adhesions were found in animals bathed in humic acid solution compared to the animals which had not been bathed at all. Peat solution and fresh peat reduced the formation of adhesions significantly, too, while warm water baths did not show any antiadhesive effect. Our results suggest humic acids to be the most effective component of peat with regard to the prevention of adhesions.

Published
1991

Catalog

Books, media, physical & digital resources
See catalog results