☆ 4.5 Article

Disappearance of the N=14 shell

PHYSICAL REVIEW C (2009)

期刊

PHYSICAL REVIEW C

卷 80, 期 2, 页码 -

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AMER PHYSICAL SOC

DOI: 10.1103/PhysRevC.80.021302

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类别

Physics, Nuclear

资金

National Science Foundation [PHY-01-10253, PHY-03-54920, PHY-04-56463, PHY-0502010, PHY-05-55366, PHY-05-55445, PHY-05-55488, PHY-06-06007]

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An excited state of N-22 unbound with respect to neutron emission was observed in a stripping reaction from a 85 MeV/nucleon F-26 beam. The observed decay energy of 650(50) keV places the level, which is interpreted to be the first 3(-) state, at an excitation energy of 1.93(22) MeV. Together with the previously measured bound states of N-22, reduction of the N=14 shell gap compared to less neutron-rich nitrogen isotopes at the neutron dripline is observed. Based on the magnitude of the reduction of the shell gap for N-22, a disappearance of the gap and even a level inversion of the nu 1s(1/2) and the nu 0d(5/2) levels in the neutron-unbound nucleus C-21 seems likely.

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Large collectivity in 29Ne at the boundary of the island of inversion

A. Revel, J. Wu, H. Iwasaki, J. Ash, D. Bazin, B. A. Brown, J. Chen, R. Elder, P. Farris, A. Gade, M. Grinder, N. Kobayashi, J. Li, B. Longfellow, T. Mijatovic, J. Pereira, A. Poves, A. Sanchez, N. Shimizu, M. Spieker, Y. Utsuno, D. Weisshaar

Summary: The heavy-ion inelastic scattering of neutron-rich nucleus 29Ne to its excited states was studied using a 100.1 MeV/u 29Ne rare isotope beam. The simultaneous measurements of the two inelastic reactions were conducted, providing the first measurement of transition strengths for this isotope. A significant E2 strength in the excitation to the 931-keV state was observed, indicating a large degree of collectivity.

PHYSICS LETTERS B (2023)

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Article Physics, Nuclear

Measurement of the 100Mo(α, xn) cross section at weak r-process energies

W-J Ong, M. L. Avila, P. Mohr, K. E. Rehm, D. Santiago-Gonzalez, J. Chen, C. R. Hoffman, Z. Meisel, F. Montes, J. Pereira

Summary: The weak r process in neutrino-driven winds following a core-collapse supernova is found to be significant for the cosmic abundances of the first r-process peak elements between Se and Ag. This paper presents the first measurement of the (100)Mo(alpha, xn) cross section using the Multi-Sampling Ionization Chamber (MUSIC) detector at the Argonne Tandem Linac Accelerator System (ATLAS) facility, demonstrating its capability for further measurements.

PHYSICAL REVIEW C (2022)

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Article Physics, Nuclear

Single-particle and collective excitations in 66Zn

A. D. Ayangeakaa, N. Sensharma, M. Fulghieri, R. V. F. Janssens, Q. B. Chen, S. Zhu, M. Alcorta, M. P. Carpenter, P. Chowdhury, A. Gade, C. R. Hoffman, F. G. Kondev, T. Lauritsen, E. A. McCutchan, A. M. Rogers, D. Seweryniak

Summary: This study investigates single-particle and collective excitations in Zn-66 via a multinucleon transfer reaction. A new quasirotational band is found and the low-spin structure is successfully described.

PHYSICAL REVIEW C (2022)

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