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Start Over Author "Petri, M. A." Journal physical review c
41 results on '"Petri, M. A."'

1. Evolution of structure and shapes in Er158 to ultrahigh spin

Author

Simpson, J, Riley, MA, Pipidis, A, Paul, ES, Wang, X, Nolan, PJ, Sharpey-Schafer, JF, Aguilar, A, Appelbe, DE, Ayangeakaa, AD, Boston, AJ, Boston, HC, Campbell, DB, Carpenter, MP, Chiara, CJ, Choy, PTW, Clark, RM, Cromaz, M, Evans, AO, Fallon, P, Garg, U, Görgen, A, Hartley, DJ, Janssens, RVF, Joss, DT, Judson, DS, Kondev, FG, Lauritsen, T, Lee, IY, Macchiavelli, AO, Matta, JT, Ollier, J, Petri, M, Revill, JP, Riedinger, LL, Rigby, SV, Teal, C, Twin, PJ, Unsworth, C, Ward, D, Zhu, S, and Ragnarsson, I

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The level structure of Er158 has been studied using the Gammasphere spectrometer via the Cd114(Ca48,4n) reaction at 215 MeV with both thin (self-supporting) and thick (backed) targets. The level scheme has been considerably extended with more than 200 new transitions and six new rotational structures, including two strongly coupled high-K bands. Configuration assignments for the new structures are based on their observed alignments, B(M1)/B(E2) ratios of reduced transition probabilities, excitation energies, and comparisons with neighboring nuclei and theoretical calculations. With increasing angular momentum, this nucleus exhibits Coriolis-induced alignments of both neutrons and protons before it then undergoes a rotation-induced transition from near-prolate collective rotation to a noncollective oblate configuration. This transition occurs via the mechanism of band termination around spin 45ħ in three rotational structures. Two distinct lifetime branches, consistent with the crossing of a collective "fast"rotational structure by an energetically favored "slow"terminating sequence, are confirmed for the positive-parity states, and similar behavior is established in the negative-parity states. Weak-intensity, high-energy transitions are observed to feed into the terminating states. At the highest spins, three collective bands with high dynamic moments of inertia and large quadrupole moments were identified. These bands are interpreted as triaxial strongly deformed structures and mark a return to collectivity at ultrahigh spin.

Published
2023

2. Core of F25 studied by the F25(−p) proton-removal reaction

Author

Crawford, HL, Jones, MD, Macchiavelli, AO, Fallon, P, Bazin, D, Bender, PC, Brown, BA, Campbell, CM, Clark, RM, Cromaz, M, Elman, B, Gade, A, Holt, JD, Janssens, RVF, Lee, IY, Longfellow, B, Paschalis, S, Petri, M, Richard, AL, Salathe, M, Tostevin, JA, and Weisshaar, D

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The Be9(BeF25(5/2+),BeO24)X proton-removal reaction was studied at the NSCL using the S800 spectrometer. The experimental spectroscopic factor for the ground-state to ground-state transition indicates a substantial depletion of the proton d5/2 strength compared to shell-model expectations, similar to the findings of an inverse-kinematics (p,2p) measurement performed at RIBF. The BeF25 to BeO24 ground-states overlap is considerably less than anticipated if the core nucleons behaved as rigid, doubly-magic BeO24 within BeF25. We interpret the new results within the framework of the Particle-Vibration Coupling (PVC) model, of a d5/2 proton coupled to a quadrupole phonon of an effective core. This approach provides a good description of the experimental data, requiring an effective BeO∗24 core with a phonon energy of ħω2= 3.2 MeV and a B(E2)≈2.7 W.u. - softer and more collective than a bare BeO24. Both the Nilsson deformed mean field and the PVC models appear to capture the properties of the effective core of BeF25, suggesting that the additional proton polarizes BeO24 in such a way that it becomes either slightly deformed or a quadrupole vibrator.

Published
2022

3. Intruder configurations of excited states in the neutron-rich isotopes P 33 and P 34

Author

Lubna, RS, Tripathi, V, Tabor, SL, Tai, PL, Kravvaris, K, Bender, PC, Volya, A, Bouhelal, M, Chiara, CJ, Carpenter, MP, Janssens, RVF, Lauritsen, T, McCutchan, EA, Zhu, S, Clark, RM, Fallon, P, MacChiavelli, AO, Paschalis, S, Petri, M, Reviol, W, and Sarantites, DG

Abstract

Excited states in the neutron-rich isotopes P33 and P34 were populated by the O18+O18 fusion-evaporation reaction at Elab=24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect γ transitions in coincidence with the charged particles emitted from the compound nucleus S36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in P33 and 21 γ rays and 20 energy levels were observed in P34 for the first time. The nearly 4π geometry of Gammasphere allowed the measurement of γ-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)ω PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both P33 and P34.

Published
2018

4. Intruder configurations of excited states in the neutron-rich isotopes P33 and P34

Author

Lubna, RS, Tripathi, Vandana, Tabor, SL, Tai, P-L, Kravvaris, K, Bender, PC, Volya, A, Bouhelal, M, Chiara, CJ, Carpenter, MP, Janssens, RVF, Lauritsen, T, McCutchan, EA, Zhu, S, Clark, RM, Fallon, P, Macchiavelli, AO, Paschalis, S, Petri, M, Reviol, W, and Sarantites, DG

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Excited states in the neutron-rich isotopes P33 and P34 were populated by the O18+O18 fusion-evaporation reaction at Elab=24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect γ transitions in coincidence with the charged particles emitted from the compound nucleus S36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in P33 and 21 γ rays and 20 energy levels were observed in P34 for the first time. The nearly 4π geometry of Gammasphere allowed the measurement of γ-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)ω PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both P33 and P34.

Published
2018

5. Cross-shell excitations in Si 31

Author

Tai, PL, Tabor, SL, Lubna, RS, Kravvaris, K, Bender, PC, Tripathi, V, Volya, A, Carpenter, MP, Janssens, RVF, Lauritsen, T, McCutchan, EA, Zhu, S, Clark, RM, Fallon, P, Paschalis, S, Petri, M, Macchiavelli, AO, Reviol, W, and Sarantites, DG

Subjects
1.1 Normal biological development and functioning
Abstract

The Si31 nucleus was produced through the O18(O18, αn) fusion-evaporation reaction at Elab=24MeV. Evaporated α particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple γ-ray coincidence events were detected in Gammasphere. The energy and angle information for the α particles was used to determine the Si31 recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new γ transitions were observed, including 14 from states above the neutron separation energy. The positive-parity states predicted by the shell-model calculations in the sd model space agree well with experiment. The negative-parity states were compared with shell-model calculations in the psdpf model space with some variations in the N=20 shell gap. The best agreement was found with a shell gap intermediate between that originally used for A≈20 nuclei and that previously adapted for P32,34. This variation suggests the need for a more universal cross-shell interaction.

Published
2017

6. γ-ray decay from neutron-bound and unbound states in Mo95 and a novel technique for spin determination

Author

Wiedeking, M, Krtička, M, Bernstein, LA, Allmond, JM, Basunia, MS, Bleuel, DL, Harke, JT, Daub, BH, Fallon, P, Firestone, RB, Goldblum, BL, Hatarik, R, Lake, PT, Larsen, AC, Lee, I-Y, Lesher, SR, Paschalis, S, Petri, M, Phair, L, Scielzo, ND, and Volya, A

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The emission of γ rays from neutron-bound and neutron-unbound states in Mo95, populated in the Mo94(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the Mo95 level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. Spins for almost all Mo95 levels below 2 MeV (and for a few levels above) have been determined with this method.

Published
2016

7. γ -ray decay from neutron-bound and unbound states in Mo 95 and a novel technique for spin determination

Author

Wiedeking, M, Krtička, M, Bernstein, LA, Allmond, JM, Basunia, MS, Bleuel, DL, Burke, JT, Daub, BH, Fallon, P, Firestone, RB, Goldblum, BL, Hatarik, R, Lake, PT, Larsen, AC, Lee, IY, Lesher, SR, Paschalis, S, Petri, M, Phair, L, Scielzo, ND, and Volya, A

Abstract

The emission of γ rays from neutron-bound and neutron-unbound states in Mo95, populated in the Mo94(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the Mo95 level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. Spins for almost all Mo95 levels below 2 MeV (and for a few levels above) have been determined with this method.

Published
2016

8. Triplet energy differences and the low lying structure of Ga62

Author

Henry, TW, Bentley, MA, Clark, RM, Davies, PJ, Bader, VM, Baugher, T, Bazin, D, Beausang, CW, Berryman, JS, Bruce, AM, Campbell, CM, Crawford, HL, Cromaz, M, Fallon, P, Gade, A, Henderson, J, Iwasaki, H, Jenkins, DG, Lee, IY, Lemasson, A, Lenzi, SM, Macchiavelli, AO, Napoli, DR, Nichols, AJ, Paschalis, S, Petri, M, Recchia, F, Rissanen, J, Simpson, EC, Stroberg, SR, Wadsworth, R, Weisshaar, D, Wiens, A, and Walz, C

Subjects
Affordable and Clean Energy, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62. Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed. Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction. Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.

Published
2015

9. Identification of excited states in Te5552107

Author

Zhang, W., primary, Cederwall, B., additional, Qi, C., additional, Ertoprak, A., additional, Aktas, Ö., additional, Liu, X., additional, Andgren, K., additional, Auranen, K., additional, Bäck, T., additional, Barber, L., additional, Beeton, G., additional, Cullen, D. M., additional, Darby, I. G., additional, Dimmock, M. R., additional, Eeckhaudt, S., additional, Ganioğlu, E., additional, Górska, M., additional, Grahn, T., additional, Greenlees, P. T., additional, Hadinia, B., additional, Ideguchi, E., additional, Illana, A., additional, Jones, P. M., additional, Joss, D. T., additional, Julin, R., additional, Juutinen, S., additional, Keatings, J. M., additional, Khaplanov, A., additional, Kulali, F., additional, Leino, M., additional, Luoma, M., additional, Lv, B., additional, Nara Singh, B. S., additional, Nelson, L., additional, Niikura, M., additional, Nyman, M., additional, Ojala, J., additional, Page, R. D., additional, Pakarinen, J., additional, Paul, E. S., additional, Petrache, C., additional, Petri, M., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Smith, J. F., additional, Sorri, J., additional, Tann, H., additional, Zimba, G., additional, Uusitalo, J., additional, Wadsworth, R., additional, and Wyss, R., additional

Published
2021
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10. γ-ray decay from neutron-bound and unbound states inMo95and a novel technique for spin determination

Author

Wiedeking, M., primary, Krtička, M., additional, Bernstein, L. A., additional, Allmond, J. M., additional, Basunia, M. S., additional, Bleuel, D. L., additional, Burke, J. T., additional, Daub, B. H., additional, Fallon, P., additional, Firestone, R. B., additional, Goldblum, B. L., additional, Hatarik, R., additional, Lake, P. T., additional, Larsen, A. C., additional, Lee, I.-Y., additional, Lesher, S. R., additional, Paschalis, S., additional, Petri, M., additional, Phair, L., additional, Scielzo, N. D., additional, and Volya, A., additional

Published
2016
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11. Persistence of collective behavior at high spin in theN=88nucleusTb153

Author

Hartley, D. J., primary, Riley, M. A., additional, Wang, X., additional, Miller, S., additional, Janssens, R. V. F., additional, Paul, E. S., additional, Rees, J. M., additional, Simpson, J., additional, Riedinger, L. L., additional, Ayangeakaa, A. D., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Garg, U., additional, Hampson, P., additional, Hoffman, C. R., additional, Kondev, F. G., additional, Lauritsen, T., additional, Mason, P. J. R., additional, Matta, J. T., additional, Nolan, P. J., additional, Ollier, J., additional, Petri, M., additional, Radford, D. C., additional, Revill, J. P., additional, Zhu, S., additional, and Ragnarsson, I., additional

Published
2015
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12. High-spin terminating states in theN=88Ho155andEr156isotones

Author

Rees, J. M., primary, Paul, E. S., additional, Simpson, J., additional, Riley, M. A., additional, Ayangeakaa, A. D., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Garg, U., additional, Hampson, P., additional, Hartley, D. J., additional, Hoffman, C. R., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Mason, P. J. R., additional, Matta, J., additional, Miller, S. L., additional, Nolan, P. J., additional, Ollier, J., additional, Petri, M., additional, Radford, D. C., additional, Revill, J. P., additional, Wang, X., additional, Zhu, S., additional, Gellanki, J., additional, and Ragnarsson, I., additional

Published
2015
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14. Spectroscopy ofGd153andGd157using the(p,dγ)reaction

Author

Ross, T. J., primary, Hughes, R. O., additional, Allmond, J. M., additional, Beausang, C. W., additional, Angell, C. T., additional, Basunia, M. S., additional, Bleuel, D. L., additional, Burke, J. T., additional, Casperson, R. J., additional, Escher, J. E., additional, Fallon, P., additional, Hatarik, R., additional, Munson, J., additional, Paschalis, S., additional, Petri, M., additional, Phair, L. W., additional, Ressler, J. J., additional, and Scielzo, N. D., additional

Published
2014
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15. Shell and shape evolution atN=28: TheMg40ground state

Author

Crawford, H. L., primary, Fallon, P., additional, Macchiavelli, A. O., additional, Clark, R. M., additional, Brown, B. A., additional, Tostevin, J. A., additional, Bazin, D., additional, Aoi, N., additional, Doornenbal, P., additional, Matsushita, M., additional, Scheit, H., additional, Steppenbeck, D., additional, Takeuchi, S., additional, Baba, H., additional, Campbell, C. M., additional, Cromaz, M., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, G., additional, Lee, I. Y., additional, Lee, J., additional, Li, K., additional, Michimasa, S., additional, Motobayashi, T., additional, Nakamura, T., additional, Ota, S., additional, Paschalis, S., additional, Petri, M., additional, Sako, T., additional, Sakurai, H., additional, Shimoura, S., additional, Takechi, M., additional, Togano, Y., additional, Wang, H., additional, and Yoneda, K., additional

Published
2014
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16. Remnants of spherical shell structures in deformed nuclei: The impact of anN=64neutron subshell closure on the structure ofN≈90gadolinium nuclei

Author

Ross, T. J., primary, Hughes, R. O., additional, Beausang, C. W., additional, Allmond, J. M., additional, Angell, C. T., additional, Basunia, M. S., additional, Bleuel, D. L., additional, Burke, J. T., additional, Casperson, R. J., additional, Escher, J. E., additional, Fallon, P., additional, Hatarik, R., additional, Munson, J., additional, Paschalis, S., additional, Petri, M., additional, Phair, L. W., additional, Ressler, J. J., additional, and Scielzo, N. D., additional

Published
2013
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17. Remnants of spherical shell structures in deformed nuclei; The Impact of an N = 64 neutron subshell closure on the structure of N {approx 90 gadolinium nuclei

Author

Ross, T. J., Hughes, R. O., Beausang, C. W., Allmond, J. M., Angell, C., Basunia, M. S., Bleuel, D. L., Burke, J. T., Casperson, R. J., Escher, J. E., Fallon, P., Hatarik, R., Munson, J., Paschalis, S., Petri, M., Phair, L. W., Ressler, J. J., and Scielzo, N. D.

Subjects
Nuclear Experiment
Abstract

Odd-mass gadolinium isotopes around $N$ = 90 were populated by the ($p,d$) reaction, utilizing 25-MeV protons, resulting in population of low-spin quasi-neutron states at energies near and below the Fermi surface. Systematics of the single quasi-neutron levels populated are presented. A large excitation energy gap is observed between levels originating from the $2d_{3/2}$, $1h_{11/2}$ and $3s_{1/2}$ spherical parents (above the $N$ = 64 gap), and the $2d_{5/2}$ (below the gap) indicating that the spherical shell model level spacing is maintained at least to moderate deformations.

Published
2013

18. Spectroscopy of88Y by the (p,dγ) reaction

Author

Ross, T. J., primary, Beausang, C. W., additional, Hughes, R. O., additional, Scielzo, N. D., additional, Burke, J. T., additional, Allmond, J. M., additional, Angell, C. T., additional, Basunia, M. S., additional, Bleuel, D. L., additional, Casperson, R. J., additional, Escher, J. E., additional, Fallon, P., additional, Hatarik, R., additional, Munson, J., additional, Paschalis, S., additional, Petri, M., additional, Phair, L., additional, and Ressler, J. J., additional

Published
2012
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19. Structure of16C: Testing shell model andab initioapproaches

Author

Petri, M., primary, Paschalis, S., additional, Clark, R. M., additional, Fallon, P., additional, Macchiavelli, A. O., additional, Starosta, K., additional, Baugher, T., additional, Bazin, D., additional, Cartegni, L., additional, Crawford, H. L., additional, Cromaz, M., additional, Datta Pramanik, U., additional, de Angelis, G., additional, Dewald, A., additional, Gade, A., additional, Grinyer, G. F., additional, Gros, S., additional, Hackstein, M., additional, Jeppesen, H. B., additional, Lee, I. Y., additional, McDaniel, S., additional, Miller, D., additional, Rajabali, M. M., additional, Ratkiewicz, A., additional, Rother, W., additional, Voss, P., additional, Walsh, K. A., additional, Weisshaar, D., additional, Wiedeking, M., additional, Brown, B. A., additional, Forssén, C., additional, Navrátil, P., additional, and Roth, R., additional

Published
2012
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20. Excited-state transition-rate measurements in18C

Author

Voss, P., primary, Baugher, T., additional, Bazin, D., additional, Clark, R. M., additional, Crawford, H. L., additional, Dewald, A., additional, Fallon, P., additional, Gade, A., additional, Grinyer, G. F., additional, Iwasaki, H., additional, Macchiavelli, A. O., additional, McDaniel, S., additional, Miller, D., additional, Petri, M., additional, Ratkiewicz, A., additional, Rother, W., additional, Starosta, K., additional, Walsh, K. A., additional, Weisshaar, D., additional, Forssén, C., additional, Roth, R., additional, and Navrátil, P., additional

Published
2012
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21. Measurement of the entry-spin distribution imparted to the high excitation continuum region of gadolinium nuclei via (p,d) and (p,t) reactions

Author

Ross, T. J., primary, Beausang, C. W., additional, Hughes, R. O., additional, Allmond, J. M., additional, Angell, C. T., additional, Basunia, M. S., additional, Bleuel, D. L., additional, Burke, J. T., additional, Casperson, R. J., additional, Escher, J. E., additional, Fallon, P., additional, Hatarik, R., additional, Munson, J., additional, Paschalis, S., additional, Petri, M., additional, Phair, L., additional, Ressler, J. J., additional, Scielzo, N. D., additional, and Thompson, I. J., additional

Published
2012
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22. Indirect determination of neutron capture cross sections on spherical and near-spherical nuclei using the surrogate method

Author

Goldblum, B. L., primary, Wiedeking, M., additional, Reed, T., additional, Alfonso, K., additional, Allmond, J. M., additional, Bernstein, L. A., additional, Bleuel, D. L., additional, Dietrich, F. S., additional, Hatarik, R., additional, Lake, P. T., additional, Lee, I.-Y., additional, Lesher, S. R., additional, Paschalis, S., additional, Petri, M., additional, Phair, L., additional, Scielzo, N. D., additional, Vial, R., additional, and Vujic, J., additional

Published
2012
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23. Multi-intruder structures in34P

Author

Bender, P. C., primary, Tabor, S. L., additional, Tripathi, Vandana, additional, Hoffman, C. R., additional, Hamilton, L., additional, Volya, A., additional, Clark, R. M., additional, Fallon, P., additional, Macchiavelli, A. O., additional, Paschalis, S., additional, Petri, M., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Lauritsen, T., additional, McCutchan, E. A., additional, Seweryniak, D., additional, Zhu, S., additional, Chiara, C. J., additional, Chen, X., additional, Reviol, W., additional, Sarantites, D. G., additional, and Toh, Y., additional

Published
2012
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24. γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

Author

Wady, P. T., primary, Smith, J. F., additional, Paul, E. S., additional, Hadinia, B., additional, Chiara, C. J., additional, Carpenter, M. P., additional, Davids, C. N., additional, Deacon, A. N., additional, Freeman, S. J., additional, Grint, A. N., additional, Janssens, R. V. F., additional, Kay, B. P., additional, Lauritsen, T., additional, Lister, C. J., additional, McGuirk, B. M., additional, Petri, M., additional, Robinson, A. P., additional, Seweryniak, D., additional, Steppenbeck, D., additional, and Zhu, S., additional

Published
2012
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25. Diverse collective excitations in159Erup to high spin

Author

Mustafa, M., primary, Ollier, J., additional, Simpson, J., additional, Riley, M. A., additional, Paul, E. S., additional, Wang, X., additional, Aguilar, A., additional, Carpenter, M. P., additional, Darby, I. G., additional, Hartley, D. J., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Nolan, P. J., additional, Petri, M., additional, Rees, J. M., additional, Revill, J. P., additional, Rigby, S. V., additional, Teal, C., additional, Thomson, J., additional, Unsworth, C., additional, Zhu, S., additional, Carlsson, B. G., additional, Ma, H. L., additional, Mufti, T., additional, and Ragnarsson, I., additional

Published
2011
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26. High-spin yrast structure of159Ho

Author

Ollier, J., primary, Simpson, J., additional, Riley, M. A., additional, Paul, E. S., additional, Wang, X., additional, Aguilar, A., additional, Carpenter, M. P., additional, Darby, I. G., additional, Hartley, D. J., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Nolan, P. J., additional, Petri, M., additional, Rigby, S. V., additional, Teal, C., additional, Thomson, J., additional, Unsworth, C., additional, and Zhu, S., additional

Published
2011
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27. Structure of23Al from the one-proton breakup reaction and astrophysical implications

Author

Banu, A., primary, Trache, L., additional, Carstoiu, F., additional, Achouri, N. L., additional, Bonaccorso, A., additional, Catford, W. N., additional, Chartier, M., additional, Dimmock, M., additional, Fernández-Domínguez, B., additional, Freer, M., additional, Gaudefroy, L., additional, Horoi, M., additional, Labiche, M., additional, Laurent, B., additional, Lemmon, R. C., additional, Negoita, F., additional, Orr, N. A., additional, Paschalis, S., additional, Patterson, N., additional, Paul, E. S., additional, Petri, M., additional, Pietras, B., additional, Roeder, B. T., additional, Rotaru, F., additional, Roussel-Chomaz, P., additional, Simmons, E., additional, Thomas, J. S., additional, and Tribble, R. E., additional

Published
2011
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28. Non-yrast positive-parity structures in theγ-soft nucleusEr156

Author

Rees, J. M., primary, Paul, E. S., additional, Riley, M. A., additional, Simpson, J., additional, Ayangeakaa, A. D., additional, Boston, H. C., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Garg, U., additional, Hartley, D. J., additional, Janssens, R. V. F., additional, Judson, D. S., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lumley, N. M., additional, Matta, J., additional, Nolan, P. J., additional, Ollier, J., additional, Petri, M., additional, Revill, J. P., additional, Riedinger, L. L., additional, Rigby, S. V., additional, Unsworth, C., additional, Wang, X., additional, and Zhu, S., additional

Published
2011
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29. Structure changes inEr160from low to ultrahigh spin

Author

Ollier, J., primary, Simpson, J., additional, Riley, M.A., additional, Paul, E.S., additional, Wang, X., additional, Aguilar, A., additional, Carpenter, M.P., additional, Darby, I.G., additional, Hartley, D.J., additional, Janssens, R.V. F., additional, Kondev, F.G., additional, Lauritsen, T., additional, Nolan, P.J., additional, Petri, M., additional, Rees, J.M., additional, Rigby, S.V., additional, Teal, C., additional, Thomson, J., additional, Unsworth, C., additional, Zhu, S., additional, Kardan, A., additional, and Ragnarsson, I., additional

Published
2011
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30. Spectroscopy of 88Y by the (p,dgamma) reaction

Author

Ross, T. J., Beausang, C. W., Hughes, R. O., Scielzo, N. D., Burke, J. T., Allmond, J. M., Angell, C., Basunia, M. S., Bleuel, D. L., Casperson, R. J., Escher, J. E., Fallon, P., Hatarik, R., Munson, J., Paschalis, S., Petri, M., Phair, L., and Ressler, J. J.

Subjects
Nuclear Experiment
Abstract

Low-spin, high-excitation energy states in $^{88}$Y have been studied using the $^{89}$Y($p,d\gamma$) reaction. For this experiment a 25 MeV proton beam was incident upon a mono-isotopic $^{89}$Y target. A silicon telescope array was used to detect deuterons and coincident $\gamma$ rays were detected using a germanium clover array. Most of the known low-excitation energy low-spin states populated strongly via the ($p,d$) reaction mechanism are confirmed. Two states are seen for the first time and seven new transitions, including one which by-passes the two low-lying isomeric states, are observed.

Published
2012

31. Publisher’s Note: Electromagnetic decays of excited states inSg261(Z=106) andRf257(Z=104) [Phys. Rev. C81, 064325 (2010)]

Author

Berryman, J. S., primary, Clark, R. M., additional, Gregorich, K. E., additional, Allmond, J. M., additional, Bleuel, D. L., additional, Cromaz, M., additional, Dragojević, I., additional, Dvorak, J., additional, Ellison, P. A., additional, Fallon, P., additional, Garcia, M. A., additional, Gros, S., additional, Lee, I. Y., additional, Macchiavelli, A. O., additional, Nitsche, H., additional, Paschalis, S., additional, Petri, M., additional, Qian, J., additional, Stoyer, M. A., additional, and Wiedeking, M., additional

Published
2010
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32. Shape coexistence at the proton drip-line: First identification of excited states inPb180

Author

Rahkila, P., primary, Jenkins, D. G., additional, Pakarinen, J., additional, Gray-Jones, C., additional, Greenlees, P. T., additional, Jakobsson, U., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Koivisto, H., additional, Leino, M., additional, Nieminen, P., additional, Nyman, M., additional, Papadakis, P., additional, Paschalis, S., additional, Petri, M., additional, Peura, P., additional, Roberts, O. J., additional, Ropponen, T., additional, Ruotsalainen, P., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Tuff, A. G., additional, Uusitalo, J., additional, Wadsworth, R., additional, Bender, M., additional, and Heenen, P.-H., additional

Published
2010
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33. Electromagnetic decays of excited states inSg261(Z=106) andRf257(Z=104)

Author

Berryman, J. S., primary, Clark, R. M., additional, Gregorich, K. E., additional, Allmond, J. M., additional, Bleuel, D. L., additional, Cromaz, M., additional, Dragojević, I., additional, Dvorak, J., additional, Ellison, P. A., additional, Fallon, P., additional, Garcia, M. A., additional, Gros, S., additional, Lee, I. Y., additional, Macchiavelli, A. O., additional, Nitsche, H., additional, Paschalis, S., additional, Petri, M., additional, Qian, J., additional, Stoyer, M. A., additional, and Wiedeking, M., additional

Published
2010
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34. Ultrahigh-spin spectroscopy ofEr159,160: Observation of triaxial strongly deformed structures

Author

Ollier, J., primary, Simpson, J., additional, Wang, X., additional, Riley, M. A., additional, Aguilar, A., additional, Teal, C., additional, Paul, E. S., additional, Nolan, P. J., additional, Petri, M., additional, Rigby, S. V., additional, Thomson, J., additional, Unsworth, C., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Zhu, S., additional, Hartley, D. J., additional, Darby, I. G., additional, and Ragnarsson, I., additional

Published
2009
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35. γ-ray spectroscopy approaching the limits of existence of atomic nuclei: A study of the excited states ofPt168andPt169

Author

Gómez Hornillos, M. B., primary, O'Donnell, D., additional, Simpson, J., additional, Joss, D. T., additional, Bianco, L., additional, Cederwall, B., additional, Grahn, T., additional, Greenlees, P. T., additional, Hadinia, B., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Labiche, M., additional, Leino, M., additional, Nyman, M., additional, Page, R. D., additional, Paul, E. S., additional, Petri, M., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sapple, P. J., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Thomson, J., additional, and Uusitalo, J., additional

Published
2009
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36. Spectroscopy of the neutron-deficient nucleusOs16791

Author

O'Donnell, D., primary, Grahn, T., additional, Joss, D. T., additional, Simpson, J., additional, Scholey, C., additional, Andgren, K., additional, Bianco, L., additional, Cederwall, B., additional, Cullen, D. M., additional, Dewald, A., additional, Ganioğlu, E., additional, Hornillos, M. B. Gómez, additional, Greenlees, P. T., additional, Hadinia, B., additional, Iwasaki, H., additional, Jakobsson, U., additional, Jolie, J., additional, Jones, P., additional, Judson, D. S., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Labiche, M., additional, Leino, M., additional, Lumley, N. M., additional, Mason, P. J. R., additional, Möller, O., additional, Nieminen, P., additional, Nyman, M., additional, Page, R. D., additional, Pakarinen, J., additional, Paul, E. S., additional, Petri, M., additional, Petts, A., additional, Peura, P., additional, Pietralla, N., additional, Pissulla, Th., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sapple, P. J., additional, Sarén, J., additional, Sorri, J., additional, Thomson, J., additional, Uusitalo, J., additional, and Watkins, H. V., additional

Published
2009
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37. Nuclear levels in proton-unboundI109: Relative single-particle energies beyond the proton drip line

Author

Petri, M., primary, Paul, E. S., additional, Cederwall, B., additional, Darby, I. G., additional, Dimmock, M. R., additional, Eeckhaudt, S., additional, Ganioğlu, E., additional, Grahn, T., additional, Greenlees, P. T., additional, Hadinia, B., additional, Jones, P., additional, Joss, D. T., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Khaplanov, A., additional, Leino, M., additional, Nelson, L., additional, Nyman, M., additional, Page, R. D., additional, Rahkila, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Uusitalo, J., additional, and Wadsworth, R., additional

Published
2007
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38. First identification of excited states inTe106and evidence for isoscalar-enhanced vibrational collectivity

Author

Hadinia, B., primary, Cederwall, B., additional, Blomqvist, J., additional, Ganioğlu, E., additional, Greenlees, P. T., additional, Andgren, K., additional, Darby, I. G., additional, Eeckhaudt, S., additional, Ideguchi, E., additional, Jones, P. M., additional, Joss, D. T., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Lagergren, K., additional, Leppänen, A.-P., additional, Leino, M., additional, Nyman, M., additional, Pakarinen, J., additional, Paul, E. S., additional, Petri, M., additional, Rahkila, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Uusitalo, J., additional, Wadsworth, R., additional, and Wyss, R., additional

Published
2005
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39. Intruder configurations of excited states in the neutron-rich isotopes 33P and 34P.

Author

Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P.-L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Macchiavelli, A. O., Paschalis, S., Petri, M., and Reviol, W.

Subjects
*POTASSIUM isotopes, *NEUTRONS, *EXCITED states
Abstract

Excited states in the neutron-rich isotopes 33P and 34P were populated by the 18O+18O fusion-evaporation reaction at Elab=24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect γ transitions in coincidence with the charged particles emitted from the compound nucleus 36S. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in 33P and 21 γ rays and 20 energy levels were observed in 34P for the first time. The nearly 4π geometry of Gammasphere allowed the measurement of γ-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)ℏω PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both 33P and 34P. [ABSTRACT FROM AUTHOR]

Published
2018
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40. Cross-shell excitations in 31Si.

Author

Tai, P.-L., Tabor, S. L., Lubna, R. S., Kravvaris, K., Bender, P. C., Tripathi, Vandana, Volya, A., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Paschalis, S., Petri, M., Macchiavelli, A. O., Reviol, W., and Sarantites, D. G.

Subjects
*DOPPLER effect, *GAMMASPHERE, *SILICON
Abstract

The 31Si nucleus was produced through the 18O(18O, αn) fusion-evaporation reaction at Elab=24MeV. Evaporated α particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple γ-ray coincidence events were detected in Gammasphere. The energy and angle information for the α particles was used to determine the 31Si recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new γ transitions were observed, including 14 from states above the neutron separation energy. The positive-parity states predicted by the shell-model calculations in the sd model space agree well with experiment. The negative-parity states were compared with shell-model calculations in the psdpf model space with some variations in the N=20 shell gap. The best agreement was found with a shell gap intermediate between that originally used for A≈20 nuclei and that previously adapted for 32,34P. This variation suggests the need for a more universal cross-shell interaction. [ABSTRACT FROM AUTHOR]

Published
2017
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41. γ -ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination.

Author

Wiedeking, M., Krtička, M., Bernstein, L. A., Allmond, J. M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R., Lake, P. T., Larsen, A. C., Lee, I.-Y., Lesher, S. R., Paschalis, S., Petri, M., Phair, L., and Scielzo, N. D.

Subjects
*PHYSICS periodicals, *BOUND states, *NEUTRON emission, *GERMANIUM detectors
Abstract

The emission of γ rays from neutron-bound and neutron-unbound states in 95Mo, populated in the 94Mo(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the 95Mo level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. Spins for almost all 95Mo levels below 2 MeV (and for a few levels above) have been determined with this method. [ABSTRACT FROM AUTHOR]

Published
2016
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